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12x12 MATRIX LED DRIVER

Integrated Silicon Solution, Inc. – www.issi.com 1Rev. A, 07/26/2016

DESCRIPTIONThe IS31FL3737 is a general purpose 12×12 LEDsmatrix driver with 1/12 cycle rate. The device can beprogrammed via an I2C compatible interface. EachLED can be dimmed individually with 8-bit PWM datawhich allowing 256 steps of linear dimming.IS31FL3737 features 3 Auto Breathing Modes whichare noted as ABM-1, ABM-2 and ABM-3. For each AutoBreathing Mode, there are 4 timing characters whichinclude current rising / holding / falling / off time and 3loop characters which include Loop-Beginning /Loop-Ending / Loop-Times. Every LED can beconfigured to be any Auto Breathing Mode or PWMmode individually.FEATURES Supply voltage range from 2.7V to 5.5V Programmable 12×12 (48 RGBs) matrix size with

de-ghost function 3 Auto Breath Modes and PWM Mode Auto breath offers 128 steps gamma current,

interrupt and state look up registers 256 steps global current setting Individual PWM control 256 steps Individual open and short error detect function QFN-40 (6mm×6mm) packageQUICK START

Figure 1: Photo of IS31FL3737 Evaluation Board

RECOMMENDED EQUIPMENT 5.0V, 2A power supply

ABSOLUTE MAXIMUM RATINGS ≤ 5.5V power supplyCaution: Do not exceed the conditions listed above, otherwisethe board will be damaged.

PROCEDUREThe IS31FL3733 evaluation board is fully assembledand tested. Follow the steps listed below to verifyboard operation.Caution: Do not turn on the power supply until all connectionsare completed.1) Short J3 to connect 3VO and VIO.2) Short J4 to connect PVCC and U1VCC.3) Connect the 5VDC power to the connector

(J1&J2).4) Turn on the power supply/Plug in the Micro USB

Pay attention to the supply current. If the currentexceeds 1A, please check for circuit fault.

ORDERING INFORMATIONPart No. Temperature Range PackageIS31FL3737-QFLS4-EB -40°C to +125°C (Industrial) QFN-40, Lead-free

Table 1: Ordering Information

For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team [email protected] or (408) 969-6600.



EVALUATION BOARD OPERATIONThe IS31FL3737 evaluation board has threeanimation display modes. Press K1 to switchconfigurations.1) Line- rotate animation2) Money animation3) Butterfly animation4) All led turn onNote: IS31FL3737 solely controls the FxLED function on theevaluation board.

SOFTWARE CONTROLJ4 default setting is closed (short). If it is set to open,the U1 (LDO) will stop working and all the 3V, includingthe supply of MCU will be cut off, all the MCU's IO willbe high impedance (open-drain) and external control isallowed.The IS31FL3737 can set its I2C bus interface logicthreshold based on the voltage on the VIO pin. Anexternal VIO voltage in the range of 1.8V≤VIO≤VCCcan be applied after removing (open) the J4 jumper.

The board comes with J4 default setting closed(short). If it is set to open, the user can connect anexternal VIO voltage supply, the external VIO voltageis recommended to equal to ex-IIC’s high logic.Follow the steps listed below for external control.1) Open J4 to disconnect the power of U1, disable

the 3V0 (3.0V).2) Open J3 to disconnect the VIO to 3V0, and

connect an external MCU VCC to VIO.3) Pull-up the SDB to VIO.4) Connect the 5VDC power to the connector

(J1&J2).5) Turn on the power supply/Plug in the Micro USB

Pay attention to the supply current. If the currentexceeds 1A, please check for circuit fault.

6) Start external IIC control.Caution: If J4 is closed (shorted), user can’t connect the user’sMCU VCC to VIO directly, otherwise the user’s MCU (maybe 1.8V)will connect to evaluation bard’s VIO (3.0V) and maybedamaged.Please refer to the datasheet to get more information aboutIS31FL3737.



VBAT1PC13-ANTI_TAMP2PC14-OSC32_IN3PC15-OSC32_OUT4OSC_IN5OSC_OUT6NRST7VSSA8VDDA9PA0-WKUP/ADC_IN0/TIM2_CH1_ETR10PA1/ADC_IN1/TIM2_CH211PA2/USART2_TX/ADC_IN2/TIM2_CH312PA3/USART2_RX/ADC_IN3/TIM2_CH413PA4/SPI1_NSS/ADC_IN414PA5/SPI1_SCK/ADC_IN515PA6/SPI1_MISO/ADC_IN6/TIM3_CH116PA7/SPI1_MOSI/ADC_IN7/TIM3_CH217PB0/ADC_IN8/TIM3_CH318PB1/ADC_IN9/TIM3_CH419PB2/BOOT120PB10/I2C2_SCL/USART3_TX21PB11/I2C2_SDA/USART3_RX22VSS_123VDD_124 PB12/SPI2_NSS/TIM1_BKIN 25PB13/SPI2_SCK/TIM1_CH1N 26PB14/SPI2_MISO/TIM1_CH2N 27PB15/SPI2_MOSI/TIM1_CH3N 28PA8/TIM1_CH1/MCO 29PA9/USART1_TX/TIM1_CH2 30PA10/USART1_RX/TIM1_CH3 31PA11/CANRX/USBDM/TIM1_CH4 32PA12/CANTX/USBDP/TIM1_ETR 33PA13/JTMS/SWDIO 34VSS_2 35VDD_2 36PA14/JTCK/SWCLK 37PA15/JTDI 38PB3/JTDO 39PB4/JNTRST 40PB5 41PB6/I2C1_SCL/TIM4_CH1 42PB7/I2C1_SDA/TIM4_CH2 43BOOT0 44PB8/TIM4_CH3 45PB9/TIM4_CH4 46VSS_3 47VDD_3 48U2

STM32F103C8T6

OSC_INOSC_OUTGND

3V

M-SDAM-SCL

M-INTB

USB_DMUSB_DPDIOGND3V

GND

Y18M

33P

C633P

C5

OSC_IN

OSC_OUT

10nF

C2

VDD1

GND2SD3

BP 4

VOUT 5U1

LDO

1uFC1

3V

CLK

+5V

GND

GND

1uFC3

3V

3V

+5V

0.1uFC10

0.1uFC13

MCU

3V Power

100KR9 27KR5

OSC

VIO

LED Array

Micro USB

12345CON4

1KR12

1KR6

100KR8

VIO

M-SDA

M-SCL

M-INTB

M-SDA

M-SCL

M-INTB

10uFC4

22RR4

22RR2

USB_DM

USB_DP

1.5KR33.3V

USB_DMUSB_DP

k1

GND

1uFC5

GND

0.1uFC11

D1

DFLS240

NC

D2

DFLS240

10KR1

100KR7100KR11

1234567891011121314151617181920

CON3

12

J1 12

J2

12J3

Header 2H12

J4

Header 2H

GND PVCC

VIO

U1 VCC

U1 VCC

LD177 LD178 LD179 LD180 LD181 LD182 LD183 LD184












LD185 LD186 LD187 LD188

LD169 LD170 LD171 LD172

LD153 LD154 LD155 LD156

LD137 LD138 LD139 LD140

LD121 LD122 LD123 LD124

LD105 LD106 LD107 LD108

LD89 LD90 LD91 LD92

LD73 LD74 LD75 LD76

LD57 LD58 LD59 LD60

LD41 LD42 LD43 LD44

LD25 LD26 LD27 LD28

LD9 LD10 LD11 LD12

GNDGNDCLKDIO3.3VIICRSSYNCINTBSDASCLAD1AD1GNDSCLSDAPVCCVIOSDBGNDGND

PVCC3V

NCR10

3V

0.1uFC12

SDB

GND

VCC

10uFC7

62KR13

39KR14

3V

CS1

CS2

CS3

CS4

CS5

CS6

CS7

CS8

CS9

CS10

CS11

CS12

SW1

SW2

SW3

SW4

SW5

SW6

SW7

SW8

SW9

SW10

SW11

SW12

SDA_RGBSCL_RGBSDB_RGBINTB

1SW11SW21SW31SW41SW51SW61SW71SW81SW91SW101SW111SW12

1CS11CS21CS31CS41CS51CS61CS71CS81CS91CS101CS111CS12

SW1 1SW2 2SW3 3

PGND4

SW4 5SW5 6SW6 7SW7 8SW8 9SW9 10

PGND11

SW10 12SW11 13SW12 14

CS1 15CS2 16CS3 17CS4 18

PVCC19

CS5 20CS6 21CS9 22

CS10 23CS11 24CS12 25CS13 27CS14 28

PVCC26

AGND29

REST30

AVCC31VIO32

SYNC33

SDA34 SCL35

ADDR136

INTB37 SDB38

IICRS39

GND40

U3

IS3737

GND

VCC

VCC

VCC

VIO

SYNC

GND

VIO

FLASH

CE1SO2WP3GND4 SI 5

SCK 6HOLD 7

VCC 8U4

IS25LQ032C

SPI_MOSI

SPI_MISOVCC

SPI_CS

GND

VCCVCCSPI_CLK

SPI_CSSPI_CLKSPI_MISOSPI_MOSI

VCC

0.1uFC8

0.1uFC9

GND

GND

Figure 2: IS31FL3733 Application Schematic



BILL OF MATERIALSName Symbol Description Qty Supplier Part No.LDO U1 Reduced voltage 1 SGMICRO SGM2019-3.3VMCU U2 Microcontroller 1 STM STM32F103C8T6

LED Driver U3 Matrix LED Driver 1 ISSI IS31FL3733Flash U4 Flash 1 ISSI IS25LQ032CDiode LD1~LD192 Blue LED, SMD 144 Everlight 9-217/BHC-ZL1M2RY/3TDiode D1,D2 Diode, SMD 2 DIODES DFLS240Crystal Y1 Crystal, 8MHz 1 JB HC-49SResistor R7,R8,

R9,R11RES,100k,1/16W,±5%,SMD 4 Yageo RC0603JR-07100KL

Resistor R2,R4 RES,22R,1/16W,±5%,SMD 2 Yageo RC0603JR-0722RLResistor R1 RES,10k,1/16W,±5%,SMD 1 Yageo RC0603JR-0710KLResistor R3 RES,1.5k,1/16W,±5%,SMD 1 Yageo RC0603JR-071K5LResistor R5 RES,27k,1/16W,±5%,SMD 1 Yageo RC0603JR-0727KLResistor R6,R12 RES,1k,1/16W,±5%,SMD 2 Yageo RC0603JR-0701KLResistor R13 RES,62k,1/16W,±5%,SMD 1 Yageo RC0603JR-0762KLResistor R14 RES,39k,1/16W,±5%,SMD 1 Yageo RC0603JR-0739KLResistor R10 NC 1 YageoCapacitor C1,C3,C5 CAP,1µF,16V,±20%,SMD 3 Yageo CC0603KKX7R9BB105Capacitor C2 CAP,10nF,16V,±20%,SMD 1 Yageo CC0603KKX7R9BB100Capacitor C4,C7 CAP,10uF,16V, ±20%,SMD 2 Yageo CC0603KKX7R9BB106Capacitor C6,C5 CAP,33pF,16V,±20%,SMD 2 Yageo CC0603KKX7R9BB330Capacitor C8,C9,C10,C

11,C12,C13 CAP,0.1µF,16V,±20%,SMD 6 Yageo CC0603KKX7R9BB104Button K1 Button SMD 1

Bill of Materials, refer to Figure 2 above.



Figure 3: Board Component Placement Guide - Top Layer

Figure 4: Board PCB Layout - Top Layer



Figure 5: Board Component Placement Guide - Bottom Layer

Figure 6: Board PCB Layout - Bottom Layer



Figure 7: LED Board Component Placement Guide - Top Layer

Figure 8: LED Board PCB Layout - Top Layer



Figure 9: LED Board Component Placement Guide - Bottom Layer

Figure 10: LED Board PCB Layout - Bottom Layer

Copyright © 2016 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at anytime without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers areadvised to obtain the latest version of this device specification before relying on any published information and before placing orders for products.Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of theproduct can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are notauthorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that:a.) the risk of injury or damage has been minimized;b.) the user assume all such risks; andc.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances



REVISION HISTORY

Revision Detail Information DateA Initial release 2016.07.26

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