sam d21 family data sheetww1.microchip.com/downloads/en/devicedoc/sam-d21-family-datasheet... ·...

SAM D21 Family Low-Power, 32-bit Cortex-M0+ MCU with Advanced Analog

and PWM

Features

Processor ARM Cortex-M0+ CPU running at up to 48 MHz

Single-cycle hardware multiplier Micro Trace Buffer (MTB)

Memories 32/64/128/256 KB in-system self-programmable Flash 4/8/16/32 KB SRAM Memory

System Power-on Reset (POR) and Brown-out Detection (BOD) Internal and external clock options with 48 MHz Digital Frequency-Locked Loop (DFLL48M)

and 48 MHz to 96 MHz Fractional Digital Phase-Locked Loop (FDPLL96M) External Interrupt Controller (EIC) 16 external interrupts One Non-maskable Interrupt (NMI) Two-pin Serial Wire Debug (SWD) programming, test and debugging interface

Low Power Idle and Stand-by Sleep modes SleepWalking peripherals

Peripherals 12-channel Direct Memory Access Controller (DMAC) 12-channel Event System Up to five 16-bit Timer/Counters (TC), configurable as either:

One 16-bit TC with two compare/capture channels One 8-bit TC with two compare/capture channels One 32-bit TC with two compare/capture channels, by using two TCs

Three 24-bit Timer/Counters for Control (TCC), with extended functions: Up to four compare channels with optional complementary output Generation of synchronized pulse width modulation (PWM) pattern across port pins Deterministic fault protection, fast decay and configurable dead-time between

complementary output Dithering that increase resolution with up to 5 bit and reduce quantization error

32-bit Real Time Counter (RTC) with clock/calendar function Watchdog Timer (WDT)

2018 Microchip Technology Inc. Datasheet Complete DS40001882C-page 1

CRC-32 generator One full-speed (12 Mbps) Universal Serial Bus (USB) 2.0 interface

Embedded host and device function Eight endpoints

Up to six Serial Communication Interfaces (SERCOM), each configurable to operate as either: USART with full-duplex and single-wire half-duplex configuration I2C up to 3.4 MHz SPI LIN slave

One two-channel Inter-IC Sound (I2S) interface One 12-bit, 350ksps Analog-to-Digital Converter (ADC) with up to 20 channels

Differential and single-ended input 1/2x to 16x programmable gain stage Automatic offset and gain error compensation Oversampling and decimation in hardware to support 13-, 14-, 15- or 16-bit resolution

10-bit, 350 ksps Digital-to-Analog Converter (DAC) Up to four Analog Comparators (AC) with Window Compare function Peripheral Touch Controller (PTC)

256-Channel capacitive touch and proximity sensing I/O

Up to 52 programmable I/O pins Qualification

AEC-Q100 Grade 1 (-40C to 125C) Drop-in compatible with SAM D20 Packages

64-pin TQFP, QFN, UFBGA 48-pin TQFP, QFN, WLCSP 32-pin TQFP, QFN, WLCSP

Operating Voltage 1.62V 3.63V

SAM D21 Family


Table of Contents

Features.......................................................................................................................... 1

1. Description...............................................................................................................12

2. Configuration Summary...........................................................................................13

3. Ordering Information(1)............................................................................................ 14

4. Block Diagram......................................................................................................... 15

5. Pinout...................................................................................................................... 175.1. SAM D21J.................................................................................................................................. 175.2. SAM D21G................................................................................................................................. 195.3. SAM D21GxL............................................................................................................................. 215.4. SAM D21ExA/B/C...................................................................................................................... 225.5. SAM D21ExL..............................................................................................................................24

6. Signal Descriptions List........................................................................................... 25

7. I/O Multiplexing and Considerations........................................................................277.1. Multiplexed Signals.................................................................................................................... 277.2. Other Functions..........................................................................................................................30

8. Power Supply and Start-Up Considerations............................................................ 348.1. Power Domain Overview............................................................................................................348.2. Power Supply Considerations.................................................................................................... 348.3. Power-Up................................................................................................................................... 368.4. Power-On Reset and Brown-Out Detector.................................................................................36

9. Product Mapping..................................................................................................... 38

10. Memories.................................................................................................................4010.1. Embedded Memories................................................................................................................. 4010.2. Physical Memory Map................................................................................................................4010.3. NVM Calibration and Auxiliary Space........................................................................................ 41

11. Processor And Architecture.....................................................................................4511.1. Cortex M0+ Processor............................................................................................................... 4511.2. Nested Vector Interrupt Controller..............................................................................................4611.3. Micro Trace Buffer......................................................................................................................4811.4. High-Speed Bus System............................................................................................................ 4911.5. AHB-APB Bridge........................................................................................................................ 5111.6. PAC - Peripheral Access Controller........................................................................................... 52

12. Peripherals Configuration Summary........................................................................68


13. DSU - Device Service Unit...................................................................................... 7013.1. Overview.................................................................................................................................... 7013.2. Features..................................................................................................................................... 7013.3. Block Diagram............................................................................................................................7113.4. Signal Description...................................................................................................................... 7113.5. Product Dependencies...............................................................................................................7113.6. Debug Operation........................................................................................................................7213.7. Chip Erase..................................................................................................................................7413.8. Programming..............................................................................................................................7513.9. Intellectual Property Protection.................................................................................................. 7513.10. Device Identification...................................................................................................................7713.11. Functional Description................................................................................................................7813.12. Register Summary..................................................................................................................... 8313.13. Register Description...................................................................................................................85

14. Clock System.........................................................................................................10814.1. Clock Distribution..................................................................................................................... 10814.2. Synchronous and Asynchronous Clocks..................................................................................10914.3. Register Synchronization......................................................................................................... 10914.4. Enabling a Peripheral............................................................................................................... 11414.5. Disabling a Peripheral.............................................................................................................. 11414.6. On-demand, Clock Requests................................................................................................... 11414.7. Power Consumption vs. Speed................................................................................................ 11514.8. Clocks after Reset.................................................................................................................... 115

15. GCLK - Generic Clock Controller...........................................................................11615.1. Overview...................................................................................................................................11615.2. Features................................................................................................................................... 11615.3. Block Diagram.......................................................................................................................... 11615.4. Signal Description.....................................................................................................................11715.5. Product Dependencies............................................................................................................. 11715.6. Functional Description.............................................................................................................. 11815.7. Register Summary....................................................................................................................12415.8. Register Description.................................................................................................................124

16. PM Power Manager............................................................................................13816.1. Overview.................................................................................................................................. 13816.2. Features................................................................................................................................... 13816.3. Block Diagram..........................................................................................................................13916.4. Signal Description.................................................................................................................... 13916.5. Product Dependencies.............................................................................................................13916.6. Functional Description..............................................................................................................14116.7. Register Summary....................................................................................................................14916.8. Register Description.................................................................................................................149

17. SYSCTRL System Controller............................................................................. 17017.1. Overview.................................................................................................................................. 170

SAM D21 Family


17.2. Features................................................................................................................................... 17017.3. Block Diagram..........................................................................................................................17217.4. Signal Description.................................................................................................................... 17217.5. Product Dependencies.............................................................................................................17217.6. Functional Description..............................................................................................................17417.7. Register Summary....................................................................................................................19017.8. Register Description.................................................................................................................192

18. WDT Watchdog Timer........................................................................................ 23518.1. Overview.................................................................................................................................. 23518.2. Features................................................................................................................................... 23518.3. Block Diagram..........................................................................................................................23618.4. Signal Description.................................................................................................................... 23618.5. Product Dependencies.............................................................................................................23618.6. Functional Description..............................................................................................................23718.7. Register Summary....................................................................................................................24318.8. Register Description.................................................................................................................243

19. RTC Real-Time Counter.....................................................................................25419.1. Overview.................................................................................................................................. 25419.2. Features................................................................................................................................... 25419.3. Block Diagram..........................................................................................................................25519.4. Signal Description.................................................................................................................... 25519.5. Product Dependencies.............................................................................................................25519.6. Functional Description..............................................................................................................25719.7. Register Summary....................................................................................................................26319.8. Register Description.................................................................................................................265

20. DMAC Direct Memory Access Controller........................................................... 29820.1. Overview.................................................................................................................................. 29820.2. Features................................................................................................................................... 29820.3. Block Diagram..........................................................................................................................30020.4. Signal Description.................................................................................................................... 30020.5. Product Dependencies.............................................................................................................30020.6. Functional Description..............................................................................................................30120.7. Register Summary....................................................................................................................32220.8. Register Description.................................................................................................................32320.9. Register Summary - SRAM......................................................................................................35420.10. Register Description - SRAM................................................................................................... 354

21. EIC External Interrupt Controller........................................................................ 36221.1. Overview.................................................................................................................................. 36221.2. Features................................................................................................................................... 36221.3. Block Diagram..........................................................................................................................36221.4. Signal Description.................................................................................................................... 36321.5. Product Dependencies.............................................................................................................36321.6. Functional Description..............................................................................................................36421.7. Register Summary....................................................................................................................369

SAM D21 Family


21.8. Register Description.................................................................................................................369

22. NVMCTRL Nonvolatile Memory Controller.........................................................38022.1. Overview.................................................................................................................................. 38022.2. Features................................................................................................................................... 38022.3. Block Diagram..........................................................................................................................38022.4. Signal Description.................................................................................................................... 38122.5. Product Dependencies.............................................................................................................38122.6. Functional Description..............................................................................................................38222.7. Register Summary....................................................................................................................38922.8. Register Description.................................................................................................................389

23. PORT - I/O Pin Controller......................................................................................40323.1. Overview.................................................................................................................................. 40323.2. Features................................................................................................................................... 40323.3. Block Diagram..........................................................................................................................40423.4. Signal Description.................................................................................................................... 40423.5. Product Dependencies.............................................................................................................40423.6. Functional Description..............................................................................................................40623.7. Register Summary....................................................................................................................41223.8. Register Description.................................................................................................................414

24. EVSYS Event System........................................................................................ 43524.1. Overview.................................................................................................................................. 43524.2. Features................................................................................................................................... 43524.3. Block Diagram..........................................................................................................................43524.4. Signal Description.................................................................................................................... 43624.5. Product Dependencies.............................................................................................................43624.6. Functional Description..............................................................................................................43724.7. Register Summary....................................................................................................................44224.8. Register Description.................................................................................................................443

25. SERCOM Serial Communication Interface.........................................................45625.1. Overview.................................................................................................................................. 45625.2. Features................................................................................................................................... 45625.3. Block Diagram..........................................................................................................................45725.4. Signal Description.................................................................................................................... 45725.5. Product Dependencies.............................................................................................................45725.6. Functional Description..............................................................................................................459

26. SERCOM USART..................................................................................................46526.1. Overview.................................................................................................................................. 46526.2. USART Features...................................................................................................................... 46526.3. Block Diagram..........................................................................................................................46626.4. Signal Description.................................................................................................................... 46626.5. Product Dependencies.............................................................................................................46626.6. Functional Description..............................................................................................................46826.7. Register Summary....................................................................................................................482

SAM D21 Family


26.8. Register Description.................................................................................................................483

27. SERCOM SPI SERCOM Serial Peripheral Interface..........................................50727.1. Overview.................................................................................................................................. 50727.2. Features................................................................................................................................... 50727.3. Block Diagram..........................................................................................................................50827.4. Signal Description.................................................................................................................... 50827.5. Product Dependencies.............................................................................................................50827.6. Functional Description..............................................................................................................51027.7. Register Summary....................................................................................................................52227.8. Register Description.................................................................................................................523

28. SERCOM I2C Inter-Integrated Circuit.................................................................54528.1. Overview.................................................................................................................................. 54528.2. Features................................................................................................................................... 54528.3. Block Diagram..........................................................................................................................54628.4. Signal Description.................................................................................................................... 54628.5. Product Dependencies.............................................................................................................54628.6. Functional Description..............................................................................................................54828.7. Register Summary - I2C Slave.................................................................................................57228.8. Register Description - I2C Slave...............................................................................................57328.9. Register Summary - I2C Master...............................................................................................59528.10. Register Description - I2C Master............................................................................................ 596

29. I2S - Inter-IC Sound Controller..............................................................................62229.1. Overview.................................................................................................................................. 62229.2. Features................................................................................................................................... 62229.3. Block Diagram..........................................................................................................................62329.4. Signal Description.................................................................................................................... 62429.5. Product Dependencies.............................................................................................................62429.6. Functional Description..............................................................................................................62629.7. I2S Application Examples......................................................................................................... 63729.8. Register Summary....................................................................................................................64029.9. Register Description.................................................................................................................641

30. TC Timer/Counter...............................................................................................65930.1. Overview.................................................................................................................................. 65930.2. Features................................................................................................................................... 65930.3. Block Diagram..........................................................................................................................66030.4. Signal Description.................................................................................................................... 66030.5. Product Dependencies.............................................................................................................66130.6. Functional Description..............................................................................................................66230.7. Register Summary....................................................................................................................67430.8. Register Description.................................................................................................................677

31. TCC Timer/Counter for Control Applications...................................................... 70131.1. Overview.................................................................................................................................. 70131.2. Features................................................................................................................................... 701

SAM D21 Family


31.3. Block Diagram..........................................................................................................................70231.4. Signal Description.................................................................................................................... 70331.5. Product Dependencies.............................................................................................................70331.6. Functional Description..............................................................................................................70531.7. Register Summary....................................................................................................................73931.8. Register Description.................................................................................................................741

32. USB Universal Serial Bus...................................................................................78832.1. Overview.................................................................................................................................. 78832.2. Features................................................................................................................................... 78832.3. USB Block Diagram..................................................................................................................78932.4. Signal Description.................................................................................................................... 78932.5. Product Dependencies.............................................................................................................78932.6. Functional Description..............................................................................................................79132.7. Register Summary....................................................................................................................81132.8. Register Description.................................................................................................................815

33. ADC Analog-to-Digital Converter........................................................................88833.1. Overview.................................................................................................................................. 88833.2. Features................................................................................................................................... 88833.3. Block Diagram..........................................................................................................................88933.4. Signal Description.................................................................................................................... 88933.5. Product Dependencies.............................................................................................................89033.6. Functional Description..............................................................................................................89133.7. Register Summary....................................................................................................................90133.8. Register Description.................................................................................................................902

34. AC Analog Comparators.....................................................................................92734.1. Overview.................................................................................................................................. 92734.2. Features................................................................................................................................... 92734.3. Block Diagram..........................................................................................................................92834.4. Signal Description.................................................................................................................... 92934.5. Product Dependencies.............................................................................................................92934.6. Functional Description..............................................................................................................93034.7. Register Summary....................................................................................................................94034.8. Register Description.................................................................................................................940

35. DAC Digital-to-Analog Converter........................................................................95735.1. Overview.................................................................................................................................. 95735.2. Features................................................................................................................................... 95735.3. Block Diagram..........................................................................................................................95735.4. Signal Description.................................................................................................................... 95735.5. Product Dependencies.............................................................................................................95735.6. Functional Description..............................................................................................................95935.7. Register Summary....................................................................................................................96335.8. Register Description.................................................................................................................963

36. Peripheral Touch Controller (PTC)........................................................................ 974

SAM D21 Family


36.1. Overview.................................................................................................................................. 97436.2. Features................................................................................................................................... 97436.3. Block Diagram..........................................................................................................................97536.4. Signal Description.................................................................................................................... 97636.5. System Dependencies............................................................................................................. 97636.6. Functional Description..............................................................................................................978

37. Electrical Characteristics....................................................................................... 97937.1. Disclaimer.................................................................................................................................97937.2. Thermal Considerations........................................................................................................... 97937.3. Absolute Maximum Ratings......................................................................................................98037.4. General Operating Ratings.......................................................................................................98037.5. Supply Characteristics..............................................................................................................98137.6. Maximum Clock Frequencies...................................................................................................98137.7. Power Consumption.................................................................................................................98337.8. Peripheral Power Consumption................................................................................................98837.9. I/O Pin Characteristics..............................................................................................................99137.10. Injection Current.......................................................................................................................99337.11. Analog Characteristics............................................................................................................. 99437.12. NVM Characteristics.............................................................................................................. 100837.13. Oscillators Characteristics......................................................................................................100937.14. PTC Typical Characteristics...................................................................................................101737.15. USB Characteristics...............................................................................................................102337.16. Timing Characteristics............................................................................................................1024

38. Electrical Characteristics at 105C...................................................................... 103438.1. Disclaimer...............................................................................................................................103438.2. Absolute Maximum Ratings....................................................................................................103438.3. General Operating Ratings.....................................................................................................103438.4. Maximum Clock Frequencies.................................................................................................103538.5. Power Consumption...............................................................................................................103638.6. Analog Characteristics........................................................................................................... 103938.7. NVM Characteristics...............................................................................................................104738.8. Oscillators Characteristics......................................................................................................104838.9. USB Characteristics............................................................................................................... 105438.10. Timing Characteristics............................................................................................................1054

39. Electrical Characteristics at 125C...................................................................... 105539.1. Disclaimer...............................................................................................................................105539.2. Absolute Maximum Ratings....................................................................................................105539.3. General Operating Ratings.....................................................................................................105539.4. Maximum Clock Frequencies.................................................................................................105639.5. Power Consumption...............................................................................................................105939.6. Analog Characteristics........................................................................................................... 106239.7. NVM Characteristics...............................................................................................................107439.8. Oscillators Characteristics......................................................................................................107539.9. Timing Characteristics............................................................................................................1085

SAM D21 Family


40. AEC-Q100 125C Specifications.........................................................................109040.1. Disclaimer...............................................................................................................................109040.2. Thermal Considerations......................................................................................................... 109040.3. Absolute Maximum Ratings....................................................................................................109040.4. General Operating Ratings.....................................................................................................109140.5. Supply Characteristics............................................................................................................109140.6. Maximum Clock Frequencies.................................................................................................109240.7. Power Consumption...............................................................................................................109540.8. I/O Pin Characteristics............................................................................................................109840.9. Analog Characteristics............................................................................................................110140.10. NVM Characteristics...............................................................................................................111240.11. Oscillator Characteristics........................................................................................................ 111440.12. PTC Characteristics............................................................................................................... 1123

41. Packaging Information......................................................................................... 112741.1. Package Drawings..................................................................................................................112741.2. Soldering Profile..................................................................................................................... 1151

42. Schematic Checklist............................................................................................ 115242.1. Introduction.............................................................................................................................115242.2. Power Supply......................................................................................................................... 115242.3. External Analog Reference Connections................................................................................115342.4. External Reset Circuit.............................................................................................................115442.5. Clocks and Crystal Oscillators................................................................................................115542.6. Unused or Unconnected Pins.................................................................................................115942.7. Programming and Debug Ports.............................................................................................. 115942.8. USB Interface......................................................................................................................... 1162

43. Conventions.........................................................................................................116443.1. Numerical Notation................................................................................................................. 116443.2. Memory Size and Type...........................................................................................................116443.3. Frequency and Time...............................................................................................................116443.4. Registers and Bits.................................................................................................................. 1165

44. Acronyms and Abbreviations............................................................................... 1166

45. Data Sheet Revision History................................................................................116945.1. Rev. C 06/2018....................................................................................................................116945.2. Rev. B 04/2018.................................................................................................................... 116945.3. Rev. A 01/2017.................................................................................................................... 116945.4. Rev. O 12/2016....................................................................................................................117045.5. Rev. N 10/2016....................................................................................................................117045.6. Rev. M 09/2016....................................................................................................................117145.7. Rev. L 09/2016.....................................................................................................................117145.8. Rev. K 09/2016.................................................................................................................... 117245.9. Rev. J 07/2016.....................................................................................................................117345.10. Rev. I 03/2016..................................................................................................................... 117345.11. Rev. H 01/2016....................................................................................................................1174

SAM D21 Family


45.12. Rev. G 09/2015................................................................................................................... 117545.13. Rev. F 07/2015.................................................................................................................... 117645.14. Rev. E 02/2015....................................................................................................................117745.15. Rev. D 09/2014....................................................................................................................117845.16. Rev. C 07/2014....................................................................................................................117945.17. Rev. B 07/2014....................................................................................................................117945.18. Rev. A - 02/2014.....................................................................................................................1184

The Microchip Web Site.............................................................................................1185

Customer Change Notification Service......................................................................1185

Customer Support......................................................................................................1185

Product Identification System.................................................................................... 1186

Microchip Devices Code Protection Feature............................................................. 1186

Legal Notice...............................................................................................................1187

Trademarks................................................................................................................1187

Quality Management System Certified by DNV.........................................................1188

Worldwide Sales and Service.................................................................................... 1189

SAM D21 Family


1. DescriptionThe SAM D21 is a series of low-power microcontrollers using the 32-bit ARM Cortex-M0+ processor,and ranging from 32-pins to 64-pins with up to 256 KB Flash and 32 KB of SRAM. The SAM D21 operateat a maximum frequency of 48 MHz and reach 2.46 CoreMark/MHz. They are designed for simple andintuitive migration with identical peripheral modules, hex compatible code, identical linear address map,and pin compatible migration paths between all devices in the product series. All devices includeintelligent and flexible peripherals, Event System for inter-peripheral signaling, and support for capacitivetouch button, slider, and wheel user interfaces.

The SAM D21 provide the following features: In-system programmable Flash, 12-channel Direct MemoryAccess Controller (DMAC), 12-channel Event System, programmable Interrupt Controller, up to 52programmable I/O pins, 32-bit Real-Time Clock and Calendar (RTC), up to five 16-bit Timer/Counters(TC) and three 24-bit Timer/Counters for Control (TCC), where each TC can be configured to performfrequency and waveform generation, accurate program execution timing or input capture with time andfrequency measurement of digital signals. The TCs can operate in 8- or 16-bit mode, selected TCs canbe cascaded to form a 32-bit TC, and three timer/counters have extended functions optimized for motor,lighting, and other control applications. The series provide one full-speed USB 2.0 embedded host anddevice interface; up to six Serial Communication Modules (SERCOM) that each can be configured to actas an USART, UART, SPI, I2C up to 3.4MHz, SMBus, PMBus, and LIN slave; two-channel I2S interface;up to twenty-channel 350 ksps 12-bit ADC with programmable gain and optional oversampling anddecimation supporting up to 16-bit resolution, one 10-bit 350 ksps DAC, up to four analog comparatorswith Window mode, Peripheral Touch Controller (PTG) supporting up to 256 buttons, sliders, wheels, andproximity sensing; programmable Watchdog Timer (WDT), brown-out detector and power-on Reset andtwo-pin Serial Wire Debug (SWD) program and debug interface.

All devices have accurate and low-power external and internal oscillators. All oscillators can be used as asource for the system clock. Different clock domains can be independently configured to run at differentfrequencies, enabling power saving by running each peripheral at its optimal clock frequency, and thusmaintaining a high CPU frequency while reducing power consumption.

The SAM D21 have two software-selectable sleep modes, Idle and Stand-by. In Idle mode, the CPU isstopped while all other functions can be kept running. In Stand-by mode, all clocks and functions arestopped, expect those selected to continue running. The device supports SleepWalking. This featureallows the peripheral to wake up from sleep based on predefined conditions, and thus allows the CPU towake up only when needed, e.g., when a threshold is crossed or a result is ready. The Event Systemsupports synchronous and asynchronous events, allowing peripherals to receive, react to and sendevents even in Stand-by mode.

The Flash program memory can be reprogrammed in-system through the SWD interface. The sameinterface can be used for non-intrusive on-chip debug of application code. A boot loader running in thedevice can use any communication interface to download and upgrade the application program in theFlash memory.

The SAM D21 microcontrollers are supported with a full suite of program and system development tools,including C compilers, macro assemblers, program debugger/simulators, programmers, and evaluationkits.

SAM D21 FamilyDescription


2. Configuration SummaryTable 2-1.SAM D21 E/G/J and SAM D21 EL/GL Product Family Features

Device

Prog

ram

Mem

ory

(KB

)

Dat

a M

emor

y (K

B)

Pins

Pack

ages

Oscillators Peripherals Analog

Inte

rnal

Exte

rnal

USB

SER

CO

M

TC/W

avef

orm

Out

put C

hann

els

per T

Cx

Inst

ance

TCC

Wav

efor

m O

utpu

t Cha

nnel

s pe

r TC

Cx

Inst

ance

I2S

DM

A C

hann

els

RTC

WD

T

Even

t Sys

tem

(Cha

nnel

s)

Exte

rnal

Inte

rrup

t Lin

es

I/O P

ins

AD

C C

hann

els

Ana

log

Com

para

tor

DA

C

PTC

(Mut

ual/S

elf-c

apac

itanc

e C

hann

els)

"

ATSAMD21E15A 32 4

32TQFP,

QFN

OSC32K,

OSCULP32K,

OSC8M,

DFLL48M,

FDPLL96M

XOSC32K,

XOSC,Y

4

3/2

3

8/4/2

Y

12 Y Y 12 16

26 10

2

Y

60/6

ATSAMD21E16A 64 8

ATSAMD21E17A 128 16

ATSAMD21E18A 256 32

ATSAMD21E15B 32 4

ATSAMD21E16B 64 8

ATSAMD21E15C 32 435 WLCSP

ATSAMD21E16C 64 8

ATSAMD21G15A 32 4

48TQFP,

QFN

6 8/4/2

38 14 120/10

ATSAMD21G16A 64 8

ATSAMD21G17A

(see Note 1)

128 16

ATSAMD21G18A

(see Note 1)

256 32

ATSAMD21G15B 32 4

ATSAMD21G16B 64 8

ATSAMD21J15A 32 4

64

TQFP,

QFN5/2 52 20 256/16

ATSAMD21J16A 64 8

ATSAMD21J17A 128 16

ATSAMD21J18A 256 32

ATSAMD21J15B 32 4TQFP,QFN,UFBGA

ATSAMD21J16B 64 8

ATSAMD21E15L 32 4 32 TQFP,

QFN XOSC N4 3/2 6/4/2

N26 14

4 NATSAMD21E16L 64 8 32

ATSAMD21G16L 64 8 48 QFN 6 5/2 8/4/2 38 18

Note: This part number is also available in a 45-Ball WLCSP package with a total of five TC instancesand 15 ADC Channels..

SAM D21 FamilyConfiguration Summary


3. Ordering Information(1)

ATSAMD 21 E 15 A - M U T

Product FamilySAMD = General Purpose Microcontroller

21 = Cortex M0 + CPU, Basic Feature Set

E = 32 Pins (35 Pins for WLCSP)G = 48 Pins (45 Pins for WLCSP)J = 64 Pins

No character = Tray (Default) T = Tape and Reel

U = -40 - 85C Matte Sn PlatingN = -40 - 105C Matte Sn PlatingF = -40 - 125C Matte Sn PlatingZ = -40 - 125C Matte Sn Plating (AEC-Q100 Qualified)

A = TQFP(4)M = QFN(4) U = WLCSP (2,3)

C = UFBGA

+ DMA + USB

Product Series

Flash Memory Density

Device VariantA = Default VariantB = Added RWW support for 32 KB and 64 KB memory optionsC = Silicon revision F for WLCSP45 package optionL = Pinout optimized for Analog and PWM

Pin Count

Package Carrier

Package Grade

18 = 256 KB17 = 128 KB16 = 64 KB15 = 32 KB

Package Type

Note:1. Not all combinations are valid. The available ordering numbers are listed in the Configuration

Summary.2. WLCSP package is available in -40C to 85C operating temperature range.3. WLCSP parts are programmed with a specific SPI/I2C bootloader. Refer to the "Application Note

AT09002" for additional information. Contact Microchip sales office for additional information onavailability.

4. The AEC-Q100 grade 1 qualified version is only offered in the TQFP and QFN packages. The QFNwill have wettable flanks, and both packages will be assembled with gold bond wires.

SAM D21 FamilyOrdering Information(1)


4. Block Diagram

6 x SERCOM

8 x Timer Counter

REAL TIME COUNTER

AHB-APB BRIDGE C

M

MHIGH-SPEED BUS MATRIX

POR

T

PO

RT

WATCHDOG TIMER

SERIAL WIRESWDIO

S

CORTEX-M0+ PROCESSOR Fmax 48 MHz

SWCLK

DEVICE SERVICE

UNIT

AHB-APB BRIDGE A

20-CHANNEL 12-bit ADC 350KSPS

AIN[19..0]

VREFA

AIN[3..0]

S

SRAM CONTROLLER

32/16/8/4KB RAM

M

RESET CONTROLLER

SLEEP CONTROLLER

CLOCK CONTROLLER

POWER MANAGER

RESETN

5 x TIMER / COUNTER

EVE

NT

SYST

EM

S

6 x SERCOM

Up to 4 ANALOG COMPARATORS

SYSTEM CONTROLLER

XOUT XIN

XOUT32 XIN32

OSCULP32K

OSC32K

OSC8M

DFLL48M

BOD33

XOSC32K

XOSC

VREF

X[15..0]

Y[15..0]

PERIPHERAL TOUCH

CONTROLLER

PERIPHERAL ACCESS CONTROLLER

AHB-APB BRIDGE B

VREFA

VOUT

10-bit DAC

EXTERNAL INTERRUPT CONTROLLER



EXTINT[15..0] NMI

GCLK_IO[7..0]

S

PAD0

WO1

PAD1PAD2PAD3

WO0

VREFB

256/128/64/32KB NVM

NVM CONTROLLER

Cache

S

DMA

USB FSDEVICE

MINI-HOST

DP

DM

3x TIMER / COUNTERFOR CONTROL

WOn

IOBUS

FDPLL96MDMA

DMA

DMA

DMA

DMA

MCK[1..0]SCK[1..0]INTER-IC

SOUND CONTROLLER

SD[1..0]FS[1..0]

DMA

MIC

RO

TRAC

E BU

FFER

SOF 1KHZ

WO0WO1

(2)

GENERIC CLOCKCONTROLLER

CMP[1..0]

1. Some products have different number of SERCOM instances, Timer/Counter instances, PTCsignals and ADC signals. Refer to the Configuration Summary for details.

2. The three TCC instances have different configurations, including the number of Waveform Output(WO) lines. Refer to the TCC Configuration for details.

Related Links2. Configuration Summary

SAM D21 FamilyBlock Diagram


7.2.5 TCC Configurations

SAM D21 FamilyBlock Diagram


5. Pinout

5.1 SAM D21J

5.1.1 QFN64 / TQFP64

PA00 1PA01 2PA02 3PA03 4PB04 5PB05 6

GNDANA 7VDDANA 8

PB06 9PB07 10PB08 11PB09 12PA04 13PA05 14PA06 15PA07 16

PA08

17PA

0918

PA10

19PA

1120

VDD

IO21

GN

D22

PB10

23PB

1124

PB12

25PB

1326

PB14

27PB

1528

PA12

29PA

1330

PA14

31PA

1532

VDDIO48GND47PA2546PA2445PA2344PA2243PA2142PA2041PB1740PB1639PA1938PA1837PA1736PA1635VDDIO34GND33

PB22

49PB

2350

PA27

51R

ESET

52PA

2853

GN

D54

VDD

CO

RE

55VD

DIN

56PA

3057

PA31

58PB

3059

PB31

60PB

0061

PB01

62PB

0263

PB03

64

DIGITAL PINANALOG PINOSCILLATORGROUNDINPUT SUPPLY REGULATED OUTPUT SUPPLYRESET PIN

SAM D21 FamilyPinout


5.1.2 UFBGA64



5.2 SAM D21G

5.2.1 QFN48 / TQFP48

PA21

PA00 1PA01 2PA02 3PA03 4

GNDANA 5VDDANA 6

PB08 7PB09 8PA04 9PA05 10PA06 11PA07 12

PA08

13PA

0914

PA10

15PA

1116

VDD

IO17

GN

D18

PB10

19PB

1120

PA12

21PA

1322

PA14

23PA

1524

VDDIO36GND35PA2534PA2433PA2332PA2231

30PA2029PA1928PA1827PA1726PA1625

PB22

37PB

2338

PA27

39R

ESET

40PA

2841

GN

D42

VDD

CO

RE

43VD

DIN

44PA

3045

PA31

46PB

0247

PB03

48

DIGITAL PINANALOG PINOSCILLATORGROUNDINPUT SUPPLYREGULATED OUTPUT SUPPLYRESET PIN



5.2.2 WLCSP45

A



5.3 SAM D21GxL

5.3.1 QFN48

PA21

PA02 1PA03 2PB04 3PB05 4

GNDANA 5VDDANA 6

PB08 7PB09 8PA04 9PA05 10PA06 11PA07 12

PA08

13PA

0914

PA10

15PA

1116

VDD

IO17

GN

D18

PB10

19PB

1120

PA12

21PA

1322

PA14

23PA

1524

VDDIO36GND35PA2534PA2433PA2332PA2231

30PA2029PA1928PA1827PA1726PA1625

PA27

3738PA

2839

RES

ETN

4041

GN

D

42VD

DC

OR

E

43VD

DIN

44PA

30

45PA

31

46PB

0247

PB03

48


PB00

PB01



5.4 SAM D21ExA/B/C

5.4.1 QFN32 / TQFP32

PA00 1PA01 2PA02 3PA03 4PA04 5PA05 6PA06 7PA07 8

VDD

ANA

9G

ND

10PA

0811

PA09

12PA

1013

PA11

14PA

1415

PA15

16

PA2524PA2423PA2322PA2221PA1920PA1819PA1718PA1617

PA27

25R

ESET

26PA

2827

GN

D28

VDD

CO

RE

29VD

DIN

30PA

3031

PA31

32




5.4.2 WLCSP35

PA00

PA01

GNDA

NA

VDDA

NA

PA06

VDDIO PA1

5

PA18

PA19

PA23

PA24

PA25

PA14

PA16

PA17

PA22

PA27

RESE

T

PA03

PA05

PA10

PA08

VDDIN

VDDC

ORE

PA02

PA04

PA07

PA31

PA30

PA11

PA09

PA28

GND

GND

GND

1

2

3

4

5

6

A B C D E F



5.5 SAM D21ExL

5.5.1 QFN32 / TQFP32

PB04

1

PB05

2PA02

3PA03

4PA04 5PA05 6PA06 7PA07 8

VDD

IO/A

NA

9G

ND

10PA

0811

PA09

12PA

1013

PA11

14PA

1415

PA15

16PA2524PA2423PA2322PA2221PA1920PA1819PA1718PA1617

25R

ESET

N2627

GN

D

28VD

DC

OR

E

29VD

DIO

30PA

30

31PA

31

32PB

02PB

03

Digital PinAnalog PinOscillator PinGroundInput SupplyRegulated Output SupplyReset Pin



6. Signal Descriptions ListThe following table gives details on signal names classified by peripheral.

Signal Name Function Type Active Level

Analog Comparators - AC

AIN[3:0] AC Analog Inputs Analog

CMP[:0] AC Comparator Outputs Digital

Analog Digital Converter - ADC

AIN[19:0] ADC Analog Inputs Analog

VREFA ADC Voltage External Reference A Analog

VREFB ADC Voltage External Reference B Analog

Digital Analog Converter - DAC

VOUT DAC Voltage output Analog

VREFA DAC Voltage External Reference Analog

External Interrupt Controller

EXTINT[15:0] External Interrupts Input

NMI External Non-Maskable Interrupt Input

Generic Clock Generator - GCLK

GCLK_IO[7:0] Generic Clock (source clock or generic clock generatoroutput)

I/O

Inter-IC Sound Controller - I2S

MCK[1:0] Master Clock I/O

SCK[1:0] Serial Clock I/O

FS[1:0] I2S Word Select or TDM Frame Sync I/O

SD[1:0] Serial Data Input or Output I/O

Power Manager - PM

RESETN Reset Input Low

Serial Communication Interface - SERCOMx

PAD[3:0] SERCOM I/O Pads I/O

System Control - SYSCTRL

XIN Crystal Input Analog/ Digital

XIN32 32kHz Crystal Input Analog/ Digital

XOUT Crystal Output Analog

SAM D21 FamilySignal Descriptions List


Signal Name Function Type Active Level

XOUT32 32kHz Crystal Output Analog

Timer Counter - TCx

WO[1:0] Waveform Outputs Output

Timer Counter - TCCx

WO[1:0] Waveform Outputs Output

Peripheral Touch Controller - PTC

X[15:0] PTC Input Analog

Y[15:0] PTC Input Analog

General Purpose I/O - PORT

PA25 - PA00 Parallel I/O Controller I/O Port A I/O



PB17 - PB00 Parallel I/O Controller I/O Port B I/O



Universal Serial Bus - USB

DP DP for USB I/O

DM DM for USB I/O

SOF 1kHz USB Start of Frame I/O

SAM D21 FamilySignal Descriptions List


7. I/O Multiplexing and Considerations

7.1 Multiplexed SignalsEach pin is by default controlled by the PORT as a general purpose I/O and alternatively it can beassigned to one of the peripheral functions A, B, C, D, E, F, G or H. To enable a peripheral function on apin, the Peripheral Multiplexer Enable bit in the Pin Configuration register corresponding to that pin(PINCFGn.PMUXEN, n = 0-31) in the PORT must be written to one. The selection of peripheral functionA to H is done by writing to the Peripheral Multiplexing Odd and Even bits in the Peripheral Multiplexingregister (PMUXn.PMUXE/O) in the PORT.

This table describes the peripheral signals multiplexed to the PORT I/O pins.

Table 7-1. PORT Function Multiplexing for A, B, and C Variant DevicesPin(1) I/O Pin Supply A B(2)(3) C D E F G H

SAMD21E SAMD21G SAMD21J EIC REF ADC AC PTC DAC SERCOM(2)(3) SERCOM-ALT TC(4)

/TCC

TCC COM AC/

GCLK

1 1 1 PA00 VDDANA EXTINT[0] SERCOM1/PAD[0]

TCC2/WO[0]

2 2 2 PA01 VDDANA EXTINT[1] SERCOM1/PAD[1]

TCC2/WO[1]

3 3 3 PA02 VDDANA EXTINT[2] AIN[0] Y[0] VOUT

4 4 4 PA03 VDDANA EXTINT[3] ADC/VREFADAC/

VREFA

AIN[1] Y[1]

5 PB04 VDDANA EXTINT[4] AIN[12] Y[10]




7 11 PB08 VDDANA EXTINT[8] AIN[2] Y[14] SERCOM4/PAD[0]

TC4/WO[0]


TC4/WO[1]

5 9 13 PA04 VDDANA EXTINT[4] ADC/VREFB

AIN[4] AIN[0] Y[2] SERCOM0/PAD[0]

TCC0/WO[0]

6 10 14 PA05 VDDANA EXTINT[5] AIN[5] AIN[1] Y[3] SERCOM0/PAD[1]

TCC0/WO[1]


TCC1/WO[0]


TCC1/WO[1] I2S/SD[0]

11 13 17 PA08 VDDIO NMI AIN[16] X[0] SERCOM0/PAD[0]

SERCOM2/PAD[0]

TCC0/WO[0] TCC1/WO[2]

I2S/SD[1]

12 14 18 PA09 VDDIO EXTINT[9] AIN[17] X[1] SERCOM0/PAD[1]

SERCOM2/PAD[1]


I2S/MCK[0]


SERCOM2/PAD[2]


I2S/SCK[0]

GCLK_IO[4]


SERCOM2/PAD[3]


I2S/FS[0] GCLK_IO[5]

19 23 PB10 VDDIO EXTINT[10] SERCOM4/PAD[2]

TC5/WO[0] TCC0/WO[4]

I2S/MCK[1]

GCLK_IO[4]



I2S/SCK[1]

GCLK_IO[5]

25 PB12 VDDIO EXTINT[12] X[12] SERCOM4/PAD[0]





GCLK_IO[7]

SAM D21 FamilyI/O Multiplexing and Considerations


Pin(1) I/O Pin Supply A B(2)(3) C D E F G H

SAMD21E SAMD21G SAMD21J EIC REF ADC AC PTC DAC SERCOM(2)(3) SERCOM-ALT TC(4)

/TCC

TCC COM AC/

GCLK


TC5/WO[0] GCLK_IO[0]



21 29 PA12 VDDIO EXTINT[12] SERCOM2/PAD[0]

SERCOM4/PAD[0]


AC/CMP[0]


SERCOM4/PAD[1]


AC/CMP[1]

15 23 31 PA14 VDDIO EXTINT[14] SERCOM2/PAD[2]

SERCOM4/PAD[2]


GCLK_IO[0]


SERCOM4/PAD[3]


GCLK_IO[1]

17 25 35 PA16 VDDIO EXTINT[0] X[4] SERCOM1/PAD[0]

SERCOM3/PAD[0]


GCLK_IO[2]


SERCOM3/PAD[1]


GCLK_IO[3]


SERCOM3/PAD[2]


AC/CMP[0]


SERCOM3/PAD[3]


I2S/SD[0] AC/CMP[1]

39 PB16 VDDIO EXTINT[0] SERCOM5/PAD[0]


I2S/SD[1] GCLK_IO[2]



I2S/MCK[0]

GCLK_IO[3]

29 41 PA20 VDDIO EXTINT[4] X[8] SERCOM5/PAD[2]

SERCOM3/PAD[2]


I2S/SCK[0]

GCLK_IO[4]

30 42 PA21 VDDIO EXTINT[5] X[9] SERCOM5/PAD[3]

SERCOM3/PAD[3]




SERCOM5/PAD[0]


GCLK_IO[6]


SERCOM5/PAD[1]


USB/SOF1kHz

GCLK_IO[7]

23 33 45 PA24(6) VDDIO EXTINT[12] SERCOM3/PAD[2]

SERCOM5/PAD[2]


USB/DM

24 34 46 PA25(6) VDDIO EXTINT[13] SERCOM3/PAD[3]

SERCOM5/PAD[3]


USB/DP





25 39 51 PA27 VDDIO EXTINT[15] GCLK_IO[0]

27 41 53 PA28 VDDIO EXTINT[8] GCLK_IO[0]


TCC1/WO[0] SWCLK GCLK_IO[0]


TCC1/WO[1] SWDIO(5)





61 PB00 VDDANA EXTINT[0] AIN[8] Y[6] SERCOM5/PAD[2]

TC7/WO[0]

62 PB01 VDDANA EXTINT[1] AIN[9] Y[7] SERCOM5/PAD[3]

TC7/WO[1]


TC6/WO[0]


TC6/WO[1]

1. Use the SAMD21J pinout muxing for WLCSP45 package.



2. All analog pin functions are on peripheral function B. Peripheral function B must be selected todisable the digital control of the pin.

3. Only some pins can be used in SERCOM I2C mode. Refer to 7.2.3 SERCOM I2C Pins.4. Note that TC6 and TC7 are not supported on the SAM D21E and G devices. Refer to 2.

Configuration Summary for details.5. This function is only activated in the presence of a debugger.6. If the PA24 and PA25 pins are not connected, it is recommended to enable a pull-up on PA24 and

PA25 through input GPIO mode. The aim is to avoid an eventually extract power consumption(

Pin I/O Pin Supply A B(1)(2) C D E F G H

SAMD21ExL SAMD21GxL EIC REF ADC AC AC1 DAC SERCOM(1)(2) SERCOM-ALT(7) TC(3)

/TCC

TCC COM AC/

GCLK

29 PA20 VDDIO EXTINT[4] SERCOM5/PAD[2]

SERCOM3/PAD[2]


GCLK_IO[4]

30 PA21 VDDIO EXTINT[5] SERCOM5/PAD[3]

SERCOM3/PAD[3]


GCLK_IO[5]


SERCOM5/PAD[0]


GCLK_IO[6]


SERCOM5/PAD[1]


GCLK_IO[7]

23 33 PA24(5) VDDIO EXTINT[12] SERCOM3/PAD[2]

SERCOM5/PAD[2]


AC1/CMP[0]

24 34 PA25(5) VDDIO EXTINT[13] SERCOM3/PAD[3]

SERCOM5/PAD[3]


AC1/CMP[1]

37 PA27 VDDIO EXTINT[15] GCLK_IO[0]

39 PA28 VDDIO EXTINT[8] GCLK_IO[0]


TCC1/WO[0] SWCLK GCLK_IO[0]


TCC1/WO[1] SWDIO(5)

45 PB00 AIN[8]

46 PB01 AIN[9]

31 47 PB02 VDDANA EXTINT[2] AIN[10] AIN[2] SERCOM5/PAD[0]

TC6/WO[0](6)

32 48 PB03 VDDANA EXTINT[3] AIN[11] AIN[3] SERCOM5/PAD[1]

TC6/WO[1](6)

1. All analog pin functions are on peripheral function B. Peripheral function B must be selected todisable the digital control of the pin.

2. Only some pins can be used in SERCOM I2C mode.3. Note that TC6 and TC7 are not supported on the SAM D21ExL and SAM D21GxL devices. Refer to

2. Configuration Summary for details.4. This function is only activated in the presence of a debugger.5. If the PA24 and PA25 pins are not connected, it is recommended to enable a pull-up on PA24 and

PA25 through input GPIO mode. The aim is to avoid an eventually extract power consumption(

Table 7-3.Oscillator Pinout

Oscillator Supply Signal I/O pin

XOSC VDDIO XIN PA14

XOUT PA15

XOSC32K VDDANA XIN32 PA00

XOUT32 PA01

7.2.2 Serial Wire Debug Interface PinoutOnly the SWCLK pin is mapped to the normal PORT functions. A debugger cold-plugging or hot-pluggingdetection will automatically switch the SWDIO port to the SWDIO function.

Table 7-4.Serial Wire Debug Interface Pinout

Signal Supply I/O pin

SWCLK VDDIO PA30

SWDIO VDDIO PA31

7.2.3 SERCOM I2C PinsTable 7-5.SERCOM Pins Supporting I2C

Device Pins Supporting I2C Hs mode

SAM D21E PA08, PA09, PA16, PA17, PA22, PA23

SAM D21G PA08, PA09, PA12, PA13, PA16, PA17, PA22, PA23

SAM D21J PA08, PA09, PA12, PA13, PA16, PA17, PA22, PA23, PB12, PB13, PB16, PB17,PB30, PB31

7.2.4 GPIO ClustersTable 7-6.GPIO Clusters

PACKAGE CLUSTER GPIO SUPPLIESPINSCONNECTEDTO THECLUSTER

64pins 1 PB31 PB30 PA31 PA30 VDDINpin56/GNDpin54

2 PA28 PA27 PB23 PB22 VDDINpin56/GNDpin54 andVDDIO pin48/GND pin47

3 PA25 PA24 PA23 PA22 PA21 PA20 PB17 PB16 PA19 PA18 PA17 PA16 VDDIO pin48/GND pin47and VDDIOpin34/GNDpin33

4 PA15 PA14 PA13 PA12 PB15 PB14 PB13 PB12 PB11 PB10 VDDIO pin34/GND pin33



PACKAGE CLUSTER GPIO SUPPLIESPINSCONNECTEDTO THECLUSTER

and VDDIOpin21/GNDpin22

5 PA11 PA10 PA09 PA08 VDDIOpin21/GNDpin22

6 PA07 PA06 PA05 PA04 PB09 PB08 PB07 PB06 VDDANA pin8/GNDANApin7

7 PB05 PB04 PA03 PA02 PA01 PA00 PB03 PB02 PB01 PB00 VDDANA pin8/GNDANApin7

48pins 1 PA31 PA30 VDDINpin44/GNDpin42

2 PA28 PA27 PB23 PB22 VDDINpin44/GNDpin42 andVDDIOpin36/GNDpin35

3 PA25 PA24 PA23 PA22 PA21 PA20 PA19 PA18 PA17 PA16 PA15 PA14 PA13 PA12 PB11 PB10 VDDIOpin36/GNDpin35 andVDDIOpin17/GNDpin18

4 PA11 PA10 PA09 PA08 VDDIOpin17/GNDpin18

5 PA07 PA06 PA05 PA04 PB09 PB08 VDDANA pin6/GNDANA pin5

6 PA03 PA02 PA01 PA00 PB03 PB02 PB05 PB04 PB01 PB00 VDDANA pin6/GNDANA pin5

32pins 1 PA31 PA30 VDDINpin30/GND pin28

2 PA28 PA27 PA25 PA24 PA23 PA22 PA19 PA18 PA17 PA16 PA15 PA14 PA11 PA10 PA09 PA08 VDDINpin30/GND pin28 andVDDANApin9/GNDpin10

3 PA07 PA06 PA05 PA04 PA03 PA02 PA01 PA00 PB05 PB04 PB03 PB02 VDDANApin9/GNDpin10

7.2.5 TCC ConfigurationsThe SAM D21 has three instances of the Timer/Counter for Control applications (TCC) peripheral, ,TCC[2:0]. The following table lists the features for each TCC instance.



Table 7-7.TCC Configuration Summary

TCC# Channels(CC_NUM)

WaveformOutput

(WO_NUM)

Countersize

Fault Dithering Outputmatrix

Dead TimeInsertion

(DTI)

SWAP Patterngeneration

0 4 8 24-bit Yes Yes Yes Yes Yes Yes

1 2 4 24-bit Yes Yes Yes

2 2 2 16-bit Yes

Note: The number of CC registers (CC_NUM) for each TCC corresponds to the number of compare/capture channels, so that a TCC can have more Waveform Outputs (WO_NUM) than CC registers.



8. Power Supply and Start-Up Considerations

8.1 Power Domain Overview

VOLTAGEREGULATOR

VDD

IN

VDD

CO

RE

GN

D

DAC

PTC

XOSC32K

OSC32K

VDD

ANA

GN

DAN

A

PA[7:2]

PB[9:0]

PA[1:0]

Digital Logic(CPU, peripherals)

DFLL48M

VDD

IO

OSC8M

XOSC

OSCULP32K

PA[31:16]

PB[31:10]

PA[15:14]

BOD33

POR

PA[13:8]BOD12

FDPLL96M

ADC

AC

AC1

8.2 Power Supply Considerations

8.2.1 Power SuppliesThe device has several different power supply pins:

VDDIO: Powers I/O lines, OSC8M and XOSC. Voltage is 1.62V to 3.63V. VDDIN: Powers I/O lines and the internal regulator. Voltage is 1.62V to 3.63V. VDDANA: Powers I/O lines and the ADC, AC, DAC, PTC, OSCULP32K, OSC32K, XOSC32K.

Voltage is 1.62V to 3.63V. VDDCORE: Internal regulated voltage output. Powers the core, memories, peripherals, FDPLL96M,

and DFLL48M. Voltage is 1.2V.

The same voltage must be applied to both VDDIN, VDDIO and VDDANA. This common voltage isreferred to as VDD in the datasheet.

The ground pins, GND, are common to VDDCORE, VDDIO and VDDIN. The ground pin for VDDANA isGNDANA.

SAM D21 FamilyPower Supply and Start-Up Considerations


For decoupling recommendations for the different power supplies. Refer to Schematic Checklist fordetails.

Related Links42. Schematic Checklist

8.2.2 Voltage RegulatorThe voltage regulator has two different modes:

Normal mode: To be used when the CPU and peripherals are running Low Power (LP) mode: To be used when the regulator draws small static current. It can be used in

standby mode

8.2.3 Typical Powering SchematicsThe device uses a single main supply with a range of 1.62V - 3.63V.

The following figure shows the recommended power supply connection.

Figure 8-1.Power Supply Connection

(1.62V 3.63V)Main Supply VDDIO

VDDANA

VDDIN

VDDCORE

GND

GNDANA

DEVICE

8.2.4 Power-Up Sequence

8.2.4.1 Minimum Rise RateThe integrated Power-on Reset (POR) circuitry monitoring the VDDANA power supply requires aminimum rise rate. Refer to the Electrical Characteristics for details.

Related Links37. Electrical Characteristics



8.2.4.2 Maximum Rise RateThe rise rate of the power supply must not exceed the values described in Electrical Characteristics.Refer to the Electrical Characteristics for details.

Related Links37. Electrical Characteristics

8.3 Power-UpThis section summarizes the power-up sequence of the device. The behavior after power-up is controlledby the Power Manager. Refer to PM Power Manager for details.

Related Links16. PM Power Manager

8.3.1 Starting of ClocksAfter power-up, the device is set to its initial state and kept in reset, until the power has stabilizedthroughout the device. Once the power has stabilized, the device will use a 1MHz clock. This clock isderived from the 8MHz Internal Oscillator (OSC8M), which is divided by eight and used as a clock sourcefor generic clock generator 0. Generic clock generator 0 is the main clock for the Power Manager (PM).

Some synchronous system clocks are active, allowing software execution.

Refer to the Clock Mask Register section in PM Power Manager for the list of default peripheral clocksrunning. Synchronous system clocks that are running are by default not divided and receive a 1MHz clockthrough generic clock generator 0. Other generic clocks are disabled except GCLK_WDT, which is usedby the Watchdog Timer (WDT).

Related Links16. PM Power Manager

8.3.2 I/O PinsAfter power-up, the I/O pins are tri-stated.

8.3.3 Fetching of Initial InstructionsAfter reset has been released, the CPU starts fetching PC and SP values from the reset address, whichis 0x00000000. This address points to the first executable address in the internal Flash. The code readfrom the Internal Flash is free to configure the clock system and clock sources. Refer to PM PowerManager, GCLK Generic Clock Controller and SYSCTRL System Controller for details. Refer to theARM Architecture Reference Manual for more information on CPU startup (http://www.arm.com).

Related Links16. PM Power Manager17. SYSCTRL System Controller14. Clock System

8.4 Power-On Reset and Brown-Out DetectorThe SAM D21 embeds three features to monitor, warn and/or reset the device:

POR: Power-On Reset on VDDANA



http://www.arm.com

BOD33: Brown-Out Detector on VDDANA BOD12: Voltage Regulator Internal Brown-Out Detector on VDDCORE. The Voltage Regulator

Internal BOD is calibrated in production and its calibration configuration is stored in the NVM UserRow. This configuration should not be changed if the user row is written to assure the correctbehavior of the BOD12.

8.4.1 Power-On Reset on VDDANAPOR monitors VDDANA. It is always activated and monitors voltage at startup and also during all thesleep modes. If VDDANA goes below the threshold voltage, the entire chip is reset.

8.4.2 Brown-Out Detector on VDDANABOD33 monitors VDDANA. Refer to SYSCTRL System Controller for details.

Related Links17. SYSCTRL System Controller

8.4.3 Brown-Out Detector on VDDCOREOnce the device has started up, BOD12 monitors the internal VDDCORE.



9. Product MappingFigure 9-1.SAM D21 Product Mapping

Code

SRAM

Undefined

Peripherals

Reserved

Global Memory Space0x00000000

0x20000000

0x20008000

0x40000000

0x43000000

0x60000000

Internal SRAM

AHB-APB Bridge A

AHB-APB Bridge B

AHB-APB Bridge C

AHB-APB

Internal Flash

Reserved

Code

0x00000000

0x00040000 0x1FFFFFFF

0x20000000 0x20007FFF

0x40000000

0x41000000

0x42000000

0x42FFFFFF

Reserved

PAC0

PM

SYSCTRL

GCLK

WDT

RTC

EIC

AHB-APB Bridge A0x40000000

0x40000400

0x40000800

0x40000C00

0x40001000

0x40001400

0x40001800

0x40FFFFFF 0x40001C00

AHB-APB Bridge B

PAC1

DSU

NVMCTRL

PORT

0x41000000

0x41002000

0x41004000

0x41004400

0x41FFFFFF 0x41007000

SERCOM5

PAC2

EVSYS

SERCOM0

SERCOM1

SERCOM2

SERCOM3

SERCO

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