ht16d35a single colour matrix led display application ...ht16d35a single-colour matrix led display...

HT16D35A Single-colour Matrix LED Display Application Example

AN0453E V1.00 1 / 16 April 20, 2017

HT16D35A Single Colour Matrix LED Display Application Example

D/N: AN0453E

Introduction The Holtek HT16D35A is an LED driver IC which includes an integrated display data

memory. It communicates with MCUs via a 3-wire serial interface and can drive up to 72

RGB LEDs composed of 8 rows × 9 commons or 224 single-colour LEDs composed of 8

rows × 28 commons. A range of colour display functions are also provided, such as

scrolling, blinking, fade, matrix masking, universal COMs and universal segments.

In this application note, a demo in which the HT66F4390 is used as the master control

MCU together with four HT16D35A ICs, is provided to demonstrate how to drive LEDs to

show various HT16D35A display functions. Each single HT16D35A drives 8COM ×

28ROW red colour LEDs.

Functional Description

ROW Pin Constant Current Outputs

Each tow in the HT16D35A has the capability of providing a constant current output. This

means that the output current will remain unchanged regardless of variations in the LED

forward voltage. When driving a dot matrix LED panel, this constant current will ensure that

the display maintains a uniform brightness. The output current is setup using an external

resistor connected to the R_EXT pin and has a maximum value of 45mA. The following

formula shows the relationship between the R_EXT resistance and the output current.

IROW_MAX[A] = 15 / R_EXT (Ω) (Typ.)

The output current can be further adjusted by using the Constant Current Ratio command.

Command Adjustable Range Write Command Constant current ratio 9/16 IROW_MAX ~ IROW_MAX 36H

Binary and Gray Modes

The HT16D35A supports two display modes, Binary Mode and Gray Mode. In the Binary

Mode, the LED has two states, i.e. either on or off. A logic “1” in the RAM bit-map

indicates an “on” state of the corresponding LED. Similarly a logic “0” indicates an “off”

state. In the Gray Mode, each RGB colour supports a 64 level gray scale setting,


AN0453E V1.00 2 / 16 April 20, 2017

therefore a RGB LED can display up to 260 thousand colours. As the demo in this

application note is dealing with a single-colour display, the following description will only

show the display effects in the Binary Mode.

Display Mode

Display Memory

A single RGB LED Supported Colours Supported Display Effects

Write Command

Binary Mode 28×8-bit

7 colours (red, green, blue, yellow, magenta, cyan, white)

Window Masking, Scrolling, UCOM, USEG, Global Blinking/Fade, Direct Pin 31H

Gray Mode 28×8×6-bit 260k colours

Window Masking, Matrix Masking, Scrolling, UCOM, USEG, Global Blinking/Fade,

Blinking/Fade, Direct Pin 31H

Blinking and Fade Effects

A blinking effect is where the LED flashes with a fixed rate while the fade effect is where

the LED flashes with a fixed rate accompanied by a gradual change in brightness. The

HT16D35A contains two kinds of blinking and fade display effects. One is the Global

Blinking/Fade mode which implements effects on all of the LEDs while the other is the

Blinking/Fade mode which implements effects on a single RGB LED. The Blinking/Fade

mode is available only in the Gray Mode. The BKEN bit (38H.1) and FDEN bit (38H.0) in

the Mode Control (38H) are the two mode enable control bits. As the demo in this

application note is dealing with a single-colour display only the Global Blinking/Fade

effect will be shown.

Display Effect Display Mode Delay Time Blinking

Time Fade

RAM Size Enable Setting

Write Command

Global Blinking/ Fade

Binary Mode/ Gray Mode No delay

Off, 1s, 2s, 4s None BKEN=1 33H

Blinking/Fade Gray Mode No delay, 1/4 slope time, 2/4 slope time, 3/4 slope time Off,

1s, 2s, 4s 28×8 ×6-bit FDEN=1 82H

UCOM and USEG Effects

By using the UCOM command the column colours can be swapped. By using the USEG

command the row colours can be swapped or the colour of one row can be copied to

other rows.

Display Effect Display Mode RAM Size

Enable Setting

Write Command Note

UCOM Binary Mode/Gray Mode 8x8-bit UCEN=1 84H Invalid in Scrolling mode USEG Binary Mode/Gray Mode 28x8-bit USEN=1 86H Invalid in Scrolling mode

UCOM effect: Swap the column colours.

Initial Display UCOM Settings


AN0453E V1.00 3 / 16 April 20, 2017

Display Effect with UCOM Settings

USEG effect:

1. Swap the row colours.

2. Copy the colour of one row to other rows. The figure below shows the effect which copies the colour of Row 0 to Row 0~ Row 2.

Row 0

Row12

Row28

Row 0

Row12

Row28


AN0453E V1.00 4 / 16 April 20, 2017

Scrolling Effects

By using the scrolling function, each dot can be set to scroll left, scroll right, scroll up,

scroll down, scroll upper left, lower left, upper right or lower right. The horizontal and

vertical scrolling speeds can be setup individually. The different horizontal and vertical

speeds make the display more flexible.

No. Scrolling Direction Display Mode

Enable Setting

Scrolling Control Scrolling Speed Note

1

Binary Mode/ Gray Mode

SCEN=1

VEN=0, HEN=1,

UD=X, RL=1

Both the vertical and horizontal scrolling speed can be set within a range of 16 Frames to 256 Frames. The scrolling speeds in these two directions can be different.

The UCOM and USEG functions are invalid in the scrolling mode.

2

VEN=0, HEN=1,

UD=X, RL=0

3

VEN=1, HEN=0,

UD=0, RL=X

4

VEN=1, HEN=0,

UD=1, RL=X

5

VEN=1, HEN=1,

UD=0, RL=1

6

VEN=1, HEN=1,

UD=1, RL=1

7

VEN=1, HEN=1,

UD=0, RL=0

8

VEN=1, HEN=1,

UD=1, RL=0

Window Masking and Matrix Masking Effects

The Window Masking function is available in both the Binary Mode and the Gray Mode.

However when the Window Masking function is enabled, the display settings must be

implemented in a whole row or whole column units. The overlapping parts of the rows

and columns which are both 1 can be displayed while other dots are masked. The Matrix

Masking function is available only in the Gray Mode. The device includes a static 28×8-bit

matrix masking RAM. A logic “1” in the RAM bit-map indicates a “mask on” state of the

corresponding LED. Similarly a logic “0” indicates a “mask off” state. The Window

Left

Right

Up

Down

Left+Down

Left+Up

Right+Up

Right+Down


AN0453E V1.00 5 / 16 April 20, 2017

Masking function has a higher priority than the Matrix Masking. As the demo in this

application deals with a single-colour display, only the Window Masking effect will be

shown.

Display Effect Display Mode Display Control Lit Unit RAM Size

Enable Setting

Write Command

Window Masking Binary Mode/ Gray Mode

1: Display 0: Masked

A whole row or a whole column None None 41H, 42H

Matrix Masking Gray Mode 1: Masked 0: Display Each dot 28×8-bit MKEN 88H

Hardware Description

Hardware Block Diagram

The Demo PCB board consists of a two-layer structure using a top board and a lower

board which are connected using dual row pin headers. The top board is the red colour

LED dot matrix display board while the lower board is the MCU board for the power

control.

Mono LED Matrix

Four HT16D35A devices are cascaded together to drive a 16×56 red colour LED dot

matrix display.

Power Circuit

A DC 5V/3A power adapter is used for the power supply.

USB Communication Circuit

Using the USB interface, the data on the UI can be transmitted to the MCU HT66F4390,

and then be saved into the FLASHROM MX25L8006E.

Display Circuit

PC User Interface

Power Circuit


AN0453E V1.00 6 / 16 April 20, 2017

FLASHROM Data Storage Circuit

In the User Mode, the data in the FLASHROM MX25L8006E will be read and then be

displayed on the screen.

Touchkeys

Five touch keys are provided to display figure switching. One toggle switch is used to

switch between the Demo Mode and the User Mode.

MCU

The MCU, which here is a HT66F4390, is used to communicate with the HT16D35A to

implement the displays.

Application Circuits

Demo Operational Schematic

COM1_0

RO

W0

RO

W1

RO

W2

RO

W3

RO

W4

RO

W5

RO

W6

RO

W7

RO

W8

RO

W9

RO

W10

RO

W11

RO

W12

RO

W13

RO

W14

RO

W15

RO

W16

RO

W17

RO

W18

RO

W19

RO

W20

RO

W21

RO

W22

RO

W23

RO

W24

RO

W25

RO

W26

RO

W27

COM1_1

COM1_2

COM1_3

COM1_4

COM1_5

COM1_6

COM1_7

RO

W56

RO

W57

RO

W58

RO

W59

RO

W60

RO

W61

RO

W62

RO

W63

RO

W64

RO

W65

RO

W66

RO

W67

RO

W68

RO

W69

RO

W70

RO

W71

RO

W72

RO

W73

RO

W74

RO

W75

RO

W76

RO

W77

RO

W78

RO

W79

RO

W80

RO

W81

RO

W82

RO

W83

COM4_0

COM4_1

COM4_2

COM4_3

COM4_4

COM4_5

COM4_6

COM4_7

RO

W28

RO

W29

RO

W30

RO

W31

RO

W32

RO

W33

RO

W34

RO

W35

RO

W36

RO

W37

RO

W38

RO

W39

RO

W40

RO

W41

RO

W42

RO

W43

RO

W44

RO

W45

RO

W46

RO

W47

RO

W48

RO

W49

RO

W50

RO

W51

RO

W52

RO

W53

RO

W54

RO

W55

RO

W84

RO

W85

RO

W86

RO

W87

RO

W88

RO

W89

RO

W90

RO

W91

RO

W92

RO

W93

RO

W94

RO

W95

RO

W96

RO

W97

RO

W98

RO

W99

RO

W10

0

RO

W10

1

RO

W10

2

RO

W10

3

RO

W10

4

RO

W10

5

RO

W10

6

RO

W10

7

RO

W10

8

RO

W10

9

RO

W11

0

RO

W11

1

COM2_0

COM2_1

COM2_2

COM2_3

COM2_4

COM2_5

COM2_6

COM2_7

COM3_0

COM3_1

COM3_2

COM3_3

COM3_4

COM3_5

COM3_6

COM3_7


AN0453E V1.00 7 / 16 April 20, 2017

Fig.1 HT16D35A Single Colour Matrix LED Display Board Circuit

Fig.2 HT16D35A Power Control Board Circuit

R13 0R/0805

Connector

Power

MCU

NC1

NC2

PA0/OCDSDA3

UDN/GPIO04

UDP/GPIO15

V33O6

PE1/UBUS/VDD7

HVDD8

VSS9

PE7/RES10

PE3/OSC211

PE2/OSC112

PC7/STCK/SDA13

PC6/PTCK/SCL14

NC15

NC16

PC5/

CTC

K1

17

PC4/

CTC

K0

18

PC3/

STPB

19

PC2/

PTPB

20

PC1/

CTP

1B21

PC0/

CTP

0B22

PF7

23

PF6

24

PF5

25

PF4

26

CD

ET27

CIO

28

CC

829

CC

LK30

CC

431

CR

ST32

CRDVDD 33VO 34

CVSS 35SELF 36

PF3/STP 37PF2/PTP 38

PF1/CTP1 39PF0/CTP0 40

AVDD 41XT2 42XT1 43

AVSS 44PB0/SDO1/AN0 45PB1/SDI1/AN1 46

PB2/SCK1/AN2 47PB3/SCS1/AN3 48

NC

49N

C50

PB5/

STPI

/TX

1/A

N5

52PB

6/IN

T0/R

X1/

AN

653

PB7/

VR

EF/A

N7

54PE

0/V

DD

IO55

PA7/

SCS0

/C1-

56PA

6/SC

K0/

C1+

57PA

5/SD

I0/C

1X58

PA4/

SDO

0/C

0-59

PA3/

TX0/

C0+

60PA

2/O

CD

SCK

61PA

1/R

X0/

C0X

62N

C63

NC

64

PB4/

PTPI

/INT1

/AN

451

U1

HT66F4390-64LQFP

12Y1 6MHz

100K

R34

0.1uF

C25

RES

ET_K

EY

D3

1N4148

300RR35

VDD1

RST

47pF

C18

33RR16

33RR17

47pF

C170.1uFC19VDD1

0.1uF

C21

10uF

C20

0.1uF

C22

RST

RSTICPCKICPDA

12345

J1

ICPDA

ICPC

K

VDD1

10uF

C23

0.1uF

C24

IO_U

SB_D

-

IO_U

SB_D

+

0RR22

0RR23

0RR

210R

R20

IO_16D35_DIO

IO_16D35_CLK

IO_1

6D35

_CSB

2IO

_16D

35_C

SB1

IO_F

R_C

SIO

_FR

_CLK

IO_F

R_M

OSI

IO_F

R_M

ISO

0RR

28

0RR

300R

R31

0RR

32

0RR

190R

R18

IO_1

6D35

_CSB

4IO

_16D

35_C

SB3

IO_K

EY_F

UN

CTI

ON

IO_K

EY_P

LAY

IO_K

EY_M

ENU

IO_K

EY_U

P

IO_K

EY_D

OW

N

0RR

250R

R26

0RR

27

0RR

33

0RR

24

Mode1

R12 0R/0805R11 0R/0805R10 0R/0805R9 0R/0805

R8 0R/0805

CS#1

SO/SIO12

WP#3

GND4 SI/SIO0 5SCLK 6

HOLD# 7VCC 8

U3

MX25L6406E/8 SOP

10KR15

IO_FR_CLKIO_FR_MOSI

IO_FR_MISOIO_FR_CS 0.1uFC16

3.3V

3.3V

FlashROM

R7 0R/0805

R6 0R/0805

R4 0R/0805

R1 0R/0805

R3 0R/0805

R2 0R/0805LED_VDD

D2SS54

D1TVS/SMAJ6.0CA

12

J3

PowerIn

3.3V

VDD1LED_VDD

VDD1LED_VDD

IO_16D35_CSB3

IO_16D35_CSB1

IO_16D35_CLKIO_16D35_DIO

1 23 45 67 89 1011 1213 1415 16

J4

LED Matrix

IO_KEY_MENUIO_KEY_FUNCTION

IO_16D35_CLKIO_16D35_DIO

VDD1LED_VDD

VDD1LED_VDD IO_16D35_CSB2

IO_16D35_CSB4

1 23 45 67 89 1011 1213 1415 16

J5

LED Matrix

IO_KEY_PLAY

IO_KEY_UPIO_KEY_DOWN

VDD

1

IN2 OUT 3

GND

U2

HT7333

VDD1

0.1uF

C14

10uF

C15

3.3V

R14 0R/0805

R5 0R/0805

0RR

29

VDD1

100uFC1

100uFC3

0.1uFC2

0.1uFC4

0.1uFC6

0.1uFC13VDD1

0.1uFC12VDD1

0.1uFC11VDD1

0.1uFC10VDD1

0.1uFC9VDD1

0.1uFC8

0.1uFC7LED_VDD

LED_VDD0.1uFC5

LED_VDD

0RR37

12345

J2

USB

IO_USB_D-IO_USB_D+

NCR36VDD1


AN0453E V1.00 8 / 16 April 20, 2017

Power Circuit

Fig.3 Demo Power Supply Circuit

In the Demo, a 5V/3A power adapter is provided for the power supply. The MCU VDD,

the four HT16D35A VDD and the LED_VDD lines are routed and powered individually.

The HT7333 provides a 3.3V voltage for the FLASHROM MX25L8006E operations.

FLASHROM Data Storage Circuit

Fig.4 FLASHROM Data Storage Circuit

The data on the UI can be transmitted to the MCU via the USB interface, and then be

saved into the FLASHROM. During display operations, a frame of display data can be

read from the FLASHROM by the MCU and then transmitted to the HT16D35A to

implement this display.

Mono LED Matrix Drive Circuit

Fig.5 Single HT16D35A Driver Circuit

R13 0R/0805R12 0R/0805R11 0R/0805R10 0R/0805R9 0R/0805

R8 0R/0805

R7 0R/0805

R6 0R/0805

R4 0R/0805

R1 0R/0805

R3 0R/0805

R2 0R/0805LED_VDD

D2SS54

D1TVS/SMAJ6.0CA

12

J3

PowerIn

VDD

1

IN2 OUT 3

GND

U2

HT7333

VDD1

0.1uF

C14

10uF

C15

3.3V

R14 0R/0805

R5 0R/0805100uFC1

100uFC3

0.1uFC2

0.1uFC4

0.1uFC6

0.1uFC13VDD1

0.1uFC12VDD1

0.1uFC11VDD1

0.1uFC10VDD1

0.1uFC9VDD1

0.1uFC8

0.1uFC7LED_VDD

LED_VDD0.1uFC5

LED_VDD

CS#1

SO/SIO12

WP#3

GND4 SI/SIO0 5SCLK 6

HOLD# 7VCC 8

U3

MX25L6406E/8 SOP

10KR15

IO_FR_CLKIO_FR_MOSI

IO_FR_MISOIO_FR_CS 0.1uFC16

3.3V

3.3V

U1_

CO

M0

LED_VDD

U1_

CO

M1

U1_

CO

M2

U1 _

CO

M3

U1 _

CO

M4

U1_

CO

M5

U1_

CO

M6

U1_

CO

M7

LED_VDD

0.1uF

C2

0.1uF

C3

3KR97

0RR101

0RR

102

NCC13

NCC15

NC

C17

VDD1

0.1uF

C1 OSC1 0RR980RR990RR100IO_16D35_CLK

IO_16D35_DIO

IO_16D35_CSB1

NCC14

NCC16

ROW31

ROW22

ROW13

ROW04

R_EXT5

VSS6

VDD7

OSC8

DIO9

CLK10

CSB11

SYNC12

CO

M0

13

LED

_VD

D1 4

CO

M1

1 5

CO

M2

1 6

CO

M3

17

CO

M4

18

CO

M5

1 9

CO

M6

2 0

LED

_VD

D2 1

CO

M7

22

RO

W27

23

RO

W26

24

ROW25 25ROW24 26ROW23 27

LED_VSS 28ROW22 29ROW21 30ROW20 31ROW19 32ROW18 33ROW17 34ROW16 35ROW15 36

RO

W14

37R

OW

1338

RO

W12

3 9R

OW

114 0

RO

W10

4 1R

OW

94 2

RO

W8

43R

OW

744

RO

W6

4 5R

OW

54 6

LED

_VSS

4 7R

OW

448

U1

HT16D35A-48LQFP

ROW0ROW1ROW2ROW3

RO

W9

RO

W8

RO

W7

RO

W6

RO

W5

RO

W14

RO

W13

RO

W12

RO

W11

RO

W10

ROW21ROW20ROW19ROW18ROW17

ROW25ROW24ROW23

ROW22

RO

W4

ROW16ROW15

RO

W27

RO

W26

0RR1210RR1220RR1230RR124

0RR

125

0RR

126

0 RR

1 27

0RR

1 28

0RR

1 29

0 RR

130

0 RR

131

0 RR

1 32

0 RR

133

0RR

134

0RR

135

0RR1360RR1370RR1380RR1390RR1400RR1410RR1420RR143

0RR1440RR1450RR146

0RR

147

0RR

148

SYN

C1

OSC2

0RR

236

0RR234

SYN

C2

0RR233

0RR

235


AN0453E V1.00 9 / 16 April 20, 2017

Fig.6 Single Red-colour LED Drive Circuit

On the LED display board, four HT16D35A ICs are used. Each of them drives 8×28 dot

red LEDs forming a 16×56 red colour LED matrix. The LED types used in the demo are

the EVERLIGHT 19-217 red colour SMD LEDs. Each ROW in the HT16D35A has a

constant current output capability which means the output current remains constant

regardless of variations in the LED forward voltage. In the single HT16D35A driver circuit

as shown in fig.5, the R121 to R148 resistors connected to the ROW pins are reserved

current limiting resistors in the demo board and can be used in actual applications. The

anodes of the LEDs controlled by the same COM output are all connected to the same

PMOS transistor (AO3401) drain side. The HT16D35A COM outputs are setup as scan

high level types while the COM I/Os are used to control the external PMOS transistor

ON/OFF function. This increases the COM drive capability. When the dot matrix LEDs

are all lit up, the operating current will not exceed 1A. C1~C3 are power filtering

capacitors and C13~C17 are ESD protection components.

Touchkey Detection Circuit

Fig.7 Display Board Touchkey Circuit

Fig.8 Power Control Board Switch Circuit

The five touch keys shown in the fig.7 are used to switch the display functions of the

Mono LED Matrix. The Play key is a reserved key and provides no functions in this demo.

When one key is pressed, the corresponding I/O will be at a low level. TVS1~TVS5 are

ESD protection components. The Mode switch shown in fig.8 is used to switch the

system between the Demo Mode and the User Mode. When a high level is detected on

PF0, the system will operate in the Demo Mode. If a low level is detected, the system will

operate in the User Mode.

ROW0

10RR2 1K

R1

NCR3

U1_COM0

LED_VDD

Q1AO3401

TVS1

SMA

J6.0CA

TVS2

SMA

J6.0CA

TVS3

SMA

J6.0CA

TVS4

SMA

J6.0CA

TVS5

SMA

J6.0CA

FunctionMenuUpDownPlay

PB4PB5

PB6PB7PA3

ModePF0


AN0453E V1.00 10 / 16 April 20, 2017

MCU Control Circuit

Fig.9 MCU Control Circuit

The HT66F4390 is used as the master control MCU and takes care of two main parts. In

the Demo Mode, the MCU transfers the ROM table data to the HT16D35A via the SPI

interface to implement different LED display patterns. In the User Mode, the MCU

communicates with the UI via the USB interface and transfers the data from the UI to the

FLASHROM. After this the data can be read out to implement the corresponding Mono

LED Matrix display.

The HT66F4390 I/Os implement the following control functions:

Control Type MCU Pin No. Signal Label Control Function

USB Communication 4 IO_USB_D- USB UDN line 5 IO_USB_D+ USB UDP line

HT16D35A Chip Selection

17 IO_16D35_CSB4 No.4 HT16D35A chip selection control pin 18 IO_16D35_CSB3 No.3 HT16D35A chip selection control pin 19 IO_16D35_CSB2 No.2 HT16D35A chip selection control pin 20 IO_16D35_CSB1 No.1 HT16D35A chip selection control pin

Communication with HT16D35A (SPI)

45 IO_16D35_DIO Serial data output pin - communicates with the HT16D35A

47 IO_16D35_CLK Serial clock output pin - communicates with the HT16D35A

Touchkey State Detection

51 IO_KEY_FUNCTION Function key input detection 52 IO_KEY_MENU Menu key input detection 53 IO_KEY_PLAY Play key input detection 54 IO_KEY_DOWN Down key input detection 60 IO_KEY_UP Up key input detection

Communication with FLASHROM (SPI)

56 IO_FR_CS FLASHROM chip select control pin

57 IO_FR_CLK Serial clock output pin - communicates with the FLASHROM

58 IO_FR_MISO Serial data input pin - communicates with the FLASHROM

59 IO_FR_MOSI Serial data output pin - communicates with the FLASHROM

NC1

NC2

PA0/OCDSDA3

UDN/GPIO04

UDP/GPIO15

V33O6

PE1/UBUS/VDD7

HVDD8

VSS9

PE7/RES10

PE3/OSC211

PE2/OSC112

PC7/STCK/SDA13

PC6/PTCK/SCL14

NC15

NC16

PC5/

CTC

K1

17

PC4/

CTC

K0

18

PC3/

STPB

19

PC2/

PTPB

20

PC1/

CTP

1B21

PC0/

CTP

0B22

PF7

23

PF6

24

PF5

25

PF4

26

CD

ET27

CIO

28

CC

829

CC

LK30

CC

431

CR

ST32

CRDVDD 33VO 34

CVSS 35SELF 36

PF3/STP 37PF2/PTP 38

PF1/CTP1 39PF0/CTP0 40

AVDD 41XT2 42XT1 43

AVSS 44PB0/SDO1/AN0 45PB1/SDI1/AN1 46

PB2/SCK1/AN2 47PB3/SCS1/AN3 48

NC

49N

C50

PB5/

STPI

/TX

1/A

N5

52PB

6/IN

T0/R

X1/

AN

653

PB7/

VR

EF/A

N7

54PE

0/V

DD

IO55

PA7/

SCS0

/C1-

56PA

6/SC

K0/

C1+

57PA

5/SD

I0/C

1X58

PA4/

SDO

0/C

0-59

PA3/

TX0/

C0+

60PA

2/O

CD

SCK

61PA

1/R

X0/

C0X

62N

C63

NC

64

PB4/

PTPI

/INT1

/AN

451

U1

HT66F4390-64LQFP

12Y1 6MHz

100K

R34

0.1uF

C25

RES

ET_K

EY

D3

1N4148

300RR35

VDD1

RST

47pF

C18

33RR16

33RR17

47pF

C170.1uFC19VDD1

0.1uF

C21

10uF

C20

0.1uF

C22

RST

RSTICPCKICPDA

12345

J1

ICPDA

ICPC

K

VDD1

10uF

C23

0.1uF

C24

IO_U

SB_D

-

IO_U

SB_D

+

0RR22

0RR23

0RR

210R

R20

IO_16D35_DIO

IO_16D35_CLK

IO_1

6D35

_CSB

2IO

_16D

35_C

SB1

I O_F

R_C

SIO

_FR

_CLK

IO_F

R_M

OSI

IO_F

R_M

ISO

0RR

28

0RR

300R

R31

0RR

32

0RR

190R

R18

IO_1

6D35

_CSB

4IO

_16D

35_C

SB3

IO_K

EY_F

UN

CTI

ON

IO_K

EY_P

LAY

IO_K

EY_M

ENU

IO_K

EY_U

P

IO_K

EY_D

OW

N

0RR

250R

R26

0RR

27

0RR

33

0RR

24

Mode1

3.3V

0RR

29

VDD10RR37

12345

J2

USB

IO_USB_D-IO_USB_D+

NCR36VDD1


AN0453E V1.00 11 / 16 April 20, 2017

Software Description

Display Description

The Demo display content can be divided into two parts:

Demo Mode: When the Mode switch is turned on to the right “Demo”, the Demo mode is

enabled. The HT66F4390 can read out the data stored in the ROM using the look-up

table and transfer the data to the HT16D35A. The data is written into the HT16D35A

display data RAM and finally shown on the LED Matrix display. Switching between the

main modes is achieved by using the Menu key. After entering a Main mode, press the

Function key to enter the first sub mode of the main mode. Then press the Up or Down

keys to select the previous or next sub mode. The Play key is reserved. The display

content is shown in the following table.

No. Main Mode Sub Mode 1 Welcome Mode None

2 FFT Display Mode Cyclic switching between 7 combination colour FFT displays using the Up/Down key.

3 Breathing light Mode Cyclic switching between 7 colour breathing effect displays using the Up/Down key.

4 Moving Display Mode Cyclic switching between the moving displays using the Up/Down keys.

5 Window Masking Display Mode Cyclic switching between 3 Window Masking pattern displays using the Up/Down key.

6 Scrolling Display Mode Cyclic switching between 8 Scrolling pattern displays using the Up/Down keys.

7 USEG Display Mode Cyclic switching between 3 USEG pattern displays using the Up/Down key.

8 Brightness Display Mode Increase the example pattern brightness using the Up key or reduce the brightness using the Down key.

9 Blinking Display Mode Cyclic switching between 3 Blinking pattern displays using the Up/Down keys.

10 Direct Pin Display Mode Cyclic switching between 4 Direct Pin pattern displays using the Up/Down keys.

User Mode: When the Mode switch is turned on to the left “EV”, the User Mode is enabled

allowing users to edit patterns and functions in the UI. After this the data and functions

can be downloaded via the USB interface to implement the LED demo displays. The

following shows the UI interface with a successful Demo connection.


AN0453E V1.00 12 / 16 April 20, 2017

Software Flowchart

Main Flowchart

Start

100ms delay after power on; initialisation

TB0F=1?

TB0F=0

Demo Mode?

Key scanning

Demo Mode for first time?

Demo ModeProgram initialisation

Demo Mode display program

User ModeProgram initialisation

Display patterns and functions set on UI

Display User Mode Title

Download all UI data?

User Mode for first time?

Yes

No

No

Yes

Yes

No

No

Yes

Yes

No

Fig.10 Main Flowchart

During the Demo Board power on, the MCU system will initialise. When the Mode switch

is turned on to the right “Demo”, the Demo mode is enabled. The touch keys are used to

switch the display between different function patterns. When the Mode switch is turned on

to the left “EV”, the User Mode is enabled. The pattern and function data in the UI can be

downloaded to the Demo board to implement the displays.


AN0453E V1.00 13 / 16 April 20, 2017

Demo Mode Display Subroutine Flowchart

Start

FFT Display Mode?

Window MaskingDisplay Mode?

RETI

Display FFT patterns

Display Breathing effect patternsBreathing light Mode?

Display Window Maskingpatterns

Display Scrolling patternsScrolling Display Mode?

Display USEG patternsUSEG Display Mode?

Display Brightness patternsBrightness Display Mode?

Display Blinking patternsBlinking Display Mode?

Display Direct Pin patternsDirect Pin Display Mode?

Welcome Mode

Display Moving patternsMoving Display Mode?

Yes

No

Yes

Yes

No

No

No

Yes

No

No

No

No

Yes

Yes

Yes

Yes

Yes

No

Fig.11 Demo Mode Display Subroutine Flowchart

The Demo Mode display subprogram is used to update the Mono LED matrix display data

stored in the MCU ROM. There are 11 main modes, including the Welcome mode, FFT

Display Mode, Breathing light Mode, Moving Display Mode, Window Masking Display

Mode, Scrolling Display Mode, USEG Display Mode, Brightness Display Mode, Blinking

Display Mode, Direct Pin Display Mode. Each main mode contains multiple sub modes to

show various display effects.


AN0453E V1.00 14 / 16 April 20, 2017

User Mode Display Subroutine Flowchart

Start

RETI

Update Global Brightness

COM output display

ROW output display

Update display

Update Scrolling settings

Update Scrolling speed

Update USEG settings

Update Blinking settings

Update Direct Pin settings

Fig.12 User Mode Display Subroutine Flowchart

The User Mode display subprogram is used to update the display content with the Mono

LED matrix data downloaded from the UI. The updated content includes the Global

Brightness, COM outputs, ROW outputs, display pattern, scrolling settings, scrolling

speed, USEG settings, Blinking settings, Direct Pin settings.

Key Scanning Subroutine Flowchart

Start

Is Menu key pressed?

Is Function key pressed?

Is Up key pressed?

Is Down key pressed?

RETI

Switch displays of the main mode titles

Enter the first sub mode under the main

mode

To the next sub mode

To the last sub mode

No

No

No

No

Yes

Yes

Yes

Yes

Fig.13 Key Scanning Subroutine Flowchart

The Key Scanning Subprogram is used to switch the display mode of the red colour LED

matrix display in the Demo Mode. Switching between the main modes is executed using a

short press on the Menu key. When the main mode is selected, a short press on the

Function key will take the system into the first sub mode. Using the Up or Down keys, the

previous or the next sub mode can be selected.


AN0453E V1.00 15 / 16 April 20, 2017

UI Data Download Subroutine Flowchart

Start

Is FIFO2 readable?

Is CMD_INDEX value in A0H~ADH?

RETI

Read FIFO2 data and save in the buffer

Write data into FLASHROM corresponding locations

No

No

Yes

Yes

Fig.14 UI Data Download Subroutine Flowchart

The UI data download subprogram is used to manage the UI communication with the

MCU and to save the data in the UI into the FLASHROM. The data volume per download

is 64 bytes. When a transfer is required, the USB will send an LED display command and

the data length via Endpoint 0. After this the data can be transmitted via Endpoint 2. After

the data has been received by Endpoint 2, it will be stored into the FLASHROM

corresponding location according to the command index and data length received via

Endpoint 0.

Program Example

ASM Example

HT16D35A_MONO_LED_SPI_ASM_V00.rar

Development Platform

Led Demo Wizard.rar

Conclusion

This application note has provided a display demo in which four HT16D35A ICs are used to

show a method of implementing a variety of display effects using the HT16D35A device.


AN0453E V1.00 16 / 16 April 20, 2017

Versions and Revision Date Author Issue and Revision

2017.03.24 張馨華 First Version

Reference Files Reference file: HT16D35A Datasheet.

For more information, refer to the Holtek official website http://www.holtek.com.

Disclaimer All information, trademarks, logos, graphics, videos, audio clips, links and other items

appearing on this website ('Information') are for reference only and is subject to change at

any time without prior notice and at the discretion of Holtek Semiconductor Inc. (herein

after 'Holtek', 'the company', 'us', 'we' or 'our'). Whilst Holtek endeavors to ensure the

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Holtek to the accuracy of the Information. Holtek shall bear no responsibility for any

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IntroductionFunctional DescriptionROW Pin Constant Current OutputsBinary and Gray ModesBlinking and Fade EffectsUCOM and USEG EffectsScrolling EffectsWindow Masking and Matrix Masking Effects

Hardware DescriptionHardware Block DiagramApplication Circuits

Software DescriptionDisplay DescriptionSoftware Flowchart

Program ExampleASM ExampleDevelopment Platform

ConclusionVersions and RevisionReference FilesDisclaimer

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