12×8 DOTS MATRIX LED DRIVER

12×8 DOTS MATRIX LED DRIVER

Lumissil Microsystems – www.lumissil.com 1 Rev. A, 10/16/2019

DESCRIPTION

The IS31FL3736B is a general purpose 12×8 LEDs matrix driver with 1/12 cycle rate. The device can be programmed via an I2C compatible interface. Each LED can be dimmed individually with 8-bit PWM data which allowing 256 steps of linear dimming.

IS31FL3736B features 3 Auto Breathing Modes which are noted as ABM-1, ABM-2 and ABM-3. For each Auto Breathing Mode, there are 4 timing characters which include current rising / holding / falling / off time and 3 loop characters which include Loop-Beginning / Loop-Ending / Loop-Times. Every LED can be configured to be any Auto Breathing Mode or No-Breathing Mode individually. FEATURES

Supply voltage range from 2.7V to 5.5V Programmable 12×8 (32 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 1kHz/2kHz/4kHz/7.4kHz/25kHz PWM frequency

option 256 steps global current setting Individual PWM control 256 steps Individual open and short error detect function QFN-40 (5mm×5mm)

QUICK START

Figure 1: Photo of IS31FL3736B Evaluation Board

RECOMMENDED EQUIPMENT

5.0V, 2A power supply

ABSOLUTE MAXIMUM RATINGS

≤ 5.5V power supply

Caution: Do not exceed the conditions listed above, otherwise the board will be damaged.

PROCEDURE

The IS31FL3736B evaluation board is fully assembled and tested. Follow the steps listed below to verify board operation.

Caution: Do not turn on the power supply until all connections are 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 current exceeds 1A, please check for circuit fault.

ORDERING INFORMATION

Part No. Temperature Range Package

IS31FL3736B-QFLS4-EB -40°C to +125°C (Industrial) QFN-40, Lead-free

Table 1: Ordering Information

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



EVALUATION BOARD OPERATION

The IS31FL3736B evaluation board has three animation display modes. Press K1 to switch configurations.

1) Line-shaded animation 2) Heart animation 3) Dot-shaded line animation 4) All LED turn on

Note: IS31FL3736B solely controls the FxLED function on the evaluation board.

SOFTWARE CONTROL

J4 default setting is closed (short). If it is set to open, the U1 (LDO) will stop working and all the 3V, including the supply of MCU will be cut off, all the MCU's IO will be high impedance (open-drain) and external control is allowed.

The IS31FL3736B can set its I2C bus interface logic threshold based on the voltage on the VIO pin. An external VIO voltage in the range of 1.8V≤VIO≤VCC can 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 an external VIO voltage supply, the external VIO voltage is 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 or short the SDB to VIO (Can short by the jumper cap from J3 or J4).

4) Connect the 5VDC power to the connector (J1&J2, skip this step if use micro-USB as the power).

5) Turn on the power supply/Plug in the Micro USB Pay attention to the supply current. If the current exceeds 1A, please check for circuit fault.

6) Start external IIC control.

Caution: If J4 is closed (shorted), user can’t connect the user’s MCU VCC to VIO directly, otherwise the user’s MCU (maybe 1.8V) will connect to evaluation bard’s VIO (3.0V) and maybe damaged.

SDA SCL

PVCC VIOGND

Figure 2: Photo of Arduino connect to Evaluation Board

Follow the steps listed below for external Arduino control.

The Arduino hardware consists of an Atmel microcontroller with a bootloader allowing quick firmware updates. First download the latest Arduino Integrated Development Environment IDE (1.6.12 or greater) from www.arduino.cc/en/Main/Software. Then download the latest IS31FL3736B test firmware (sketch) from the Lumissil website http://www.lumissil.com/products/led-driver/fxled.

1) Open J4 and J3. 2) Pull-up or short the SDB of Con3 to VIO (Use the

jumper cap from J3 or J4). 3) Connect the 5 pins from Arduino board to

IS31FL3736B EVB: a) Arduino VCC5V to IS31FL3736B EVB

PVCC (Con3 or J2). b) Arduino GND to IS31FL3736B EVB GND

(Con3 or J1). c) Arduino SDA to IS31FL3736B EVB SDA. d) Arduino SCL to IS31FL3736B EVB SCL. e) If Arduino use 3.3V MCU VCC, connect

3.3V to IS31FL3736B EVB VIO, if Arduino



use 5.0V MCU VCC, connect 5.0V to EVB VIO. (Arduino UNO MCU VCC is 5V, so SDB can be 5V or 3.3V)

4) Use the test code in appendix I or Download the test firmware (sketch) form Lumissil website, a .txt file and copy the code to Arduino IDE and download to Arduino.

5) Run the Arduino code and initial mode is change the brightness every second.

6) Default 31FL3736B device address is 0xA0 (ADDR1=LOW, ADDR2=GND), if user want to change the device address, use the AD1 in Con3 a) AD1=VIO or PVCC, device address=0xA6. b) AD1=SCL, device address=0xA2. c) AD1=SDA, device address=0xA4. ADDR2 pin is fixed to GND so user can’t change it.

Please refer to the datasheet to get more information about IS31FL3736B.



LED Array

CS

1

CS

2

CS

3

CS

4

CS

5

CS

6

CS

7

CS

8

SW1

SW2

SW3

SW4

SW5

SW6

SW7

SW8

SW9

SW10

SW11

SW12

LED1 LED2 LED3 LED4 LED5 LED6 LED7 LED8












VBAT1

PC13-ANTI_TAMP2

PC14-OSC32_IN3

PC15-OSC32_OUT4

OSC_IN5

OSC_OUT6

NRST7

VSSA8

VDDA9

PA0-WKUP/ADC_IN0/TIM2_CH1_ETR10

PA1/ADC_IN1/TIM2_CH211

PA2/USART2_TX/ADC_IN2/TIM2_CH312

PA3/USART2_RX/ADC_IN3/TIM2_CH413

PA4/SPI1_NSS/ADC_IN414

PA5/SPI1_SCK/ADC_IN515

PA6/SPI1_MISO/ADC_IN6/TIM3_CH116

PA7/SPI1_MOSI/ADC_IN7/TIM3_CH217

PB0/ADC_IN8/TIM3_CH318

PB1/ADC_IN9/TIM3_CH419

PB2/BOOT120

PB10/I2C2_SCL/USART3_TX21

PB11/I2C2_SDA/USART3_RX22

VSS_123

VDD_124

PB12/SPI2_NSS/TIM1_BKIN25

PB13/SPI2_SCK/TIM1_CH1N26PB14/SPI2_MISO/TIM1_CH2N27

PB15/SPI2_MOSI/TIM1_CH3N28

PA8/TIM1_CH1/MCO29

PA9/USART1_TX/TIM1_CH2 30PA10/USART1_RX/TIM1_CH3

31PA11/CANRX/USBDM/TIM1_CH4

32PA12/CANTX/USBDP/TIM1_ETR 33

PA13/JTMS/SWDIO34

VSS_235

VDD_2 36PA14/JTCK/SWCLK

37PA15/JTDI

38PB3/JTDO

39PB4/JNTRST40

PB541

PB6/I2C1_SCL/TIM4_CH142PB7/I2C1_SDA/TIM4_CH243

BOOT044

PB8/TIM4_CH345

PB9/TIM4_CH4 46VSS_3

47VDD_3

48U2

STM32F103C8T6

OSC_INOSC_OUT

GND

3V

SDASCL

INTB

USB_DMUSB_DPDIOGND3V

GND

Y18M

33P

C7

33P

C6

OSC_IN

OSC_OUT

10nF

C2

VDD1

GND2

SD3

BP4

VOUT5

U1

LDO

1uFC1

3V

CLK

GND

1uFC3

3V0.1uF

C9

0.1uF

C8

MCU

3V Power

100KR11

20KR5

OSC

100KR8

4.7KR6

4.7KR12

K1

GND

1uFC5

GND

0.1uF

C10

10KR1

100KR7

100KR10

1234567891011121314151617181920

CON3

12

J112

J2

12

J3

Header 2H12

J4

Header 2H

GNDPVCC

VIO

U1 VCC

U1 VCC

GNDGNDCLKDIO3.3VIICRST

INTBSDASCLAD1AD1GNDSCLSDAPVCCVIOSDBGNDGND

PVCC3V

NCR9

3V

0.1uF

C11

SDB

91KR13

10KR14

3V

Micro USB

VCC1

USB_DM2

USB_DP3

NC4

GND5

Con4

10uF

C4

PVCC

GND

22R

R4

22R

R2

USB_DM

USB_DP

1.5K

R33V

USB_DMUSB_DP

10uF

C12

D1

DFL240

GND

11

22 33

44

55 66

77

8899

1010

11111212

Con2

11

22

3 3

44

55

6 6

77

88

99

1010

1111

1212

1313

1414

1515

1616

Con1

CS1CS2CS3CS4CS5CS6CS7CS8CS9CS10CS11CS12CS13CS14CS15CS16

SW1 SW2SW3 SW4SW5 SW6SW7 SW8SW9 SW10SW11 SW12

IO

PVCC

GND

GND

GND

VIO

GND

GND

GND

SW1SW2SW3SW4SW5SW6SW7SW8SW9SW10SW11SW12

CS1CS2CS3CS4CS5CS6CS7CS8

VIO

SDASCLINTBSDB

RSET

AD

IICRST

3V

SW11

SW22

SW33

PGND4

SW45

SW56

SW67SW78

SW89

SW910

PGND11

SW1012

SW1113

SW1214

CS115

CS216CS318

CS419

PVCC17

CS521CS622

CS724

CS825

PVCC23

AGND26

RSET30

AVCC28

DVCC27

VIO31

SDA33

SCL34

ADDR135

ADDR236

INTB37

SDB38

IICRS39

GND40

SYNC32

U3

IS31FL3736B

SYNC

SYNC

Figure 3: IS31FL3736B Application Schematic



BILL OF MATERIALS

Name Symbol Description Qty Supplier Part No.

LDO U1 Reduced voltage 1 SGMICRO SGM2019-3.3V

MCU U2 Microcontroller 1 STM STM32F103C8T6

LED Driver U3 Matrix LED Driver 1 Lumissil IS31FL3736B

LED LED1~LED96 Blue LED, SMD 96 Everlight 9-217/BHC-ZL1M2RY/3T

Diode D1 Diode, SMD 1 DIODES DFLS240

Crystal Y1 Crystal, 8MHz 1 JB HC-49S

Resistor R1,R14 RES,10k,1/16W,±5%,SMD 2 Yageo RC0603JR-0710KL

Resistor R2,R4 RES,22R,1/16W,±5%,SMD 2 Yageo RC0603JR-0722RL

Resistor R3 RES,1.5k,1/16W,±5%,SMD 1 Yageo RC0603JR-071K5L

Resistor R5 RES,20k,1/16W,±5%,SMD 1 Yageo RC0603JR-0720KL

Resistor R6,R12 RES,1k,1/16W,±5%,SMD 2 Yageo RC0603JR-0701KL

Resistor R7,R8,R10,R11 RES,100k,1/16W,±5%,SMD 4 Yageo RC0603JR-07100KL

Resistor R9 NC 0

Resistor R13 RES,91k,1/16W,±5%,SMD 1 Yageo RC0603JR-07910KL

Capacitor C1,C3,C5 CAP,1µF,16V,±20%,SMD 3 Yageo CC0603KKX7R9BB105

Capacitor C2 CAP,10pF,16V,±20%,SMD 1 Yageo CC0603KKX7R9BB100

Capacitor C4,C12 CAP,10µF,16V, ±20%,SMD 2 Yageo CC0603KKX7R9BB106

Capacitor C6,C7 CAP,33pF,16V,±20%,SMD 2 Yageo CC0603KKX7R9BB330

Capacitor C8,C9,C10,C11 CAP,0.1µF,16V,±20%,SMD 3 Yageo CC0603KKX7R9BB104

Button K1 Button 1

Bill of Materials, refer to Figure 3 above.



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Figure 4: Board Component Placement Guide - Top Layer

0

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0

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0 2

12

1 2

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715

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Figure 5: Board PCB Layout - Top Layer



0

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816

715

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Figure 6: Board Component Placement Guide - Bottom Layer

0

0 0

0

2 1

21

21

41

2

1

2

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22 181716151413121110987654321

2

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1

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111

0

0 0

0 2

12

1 2

1

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1

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1

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2

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2 1

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1

2

1

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1

2

1 0

1

3

2

1 1 1 1 1

1

2

1

816

715

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10

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6

5

4

3

2

1

12

11

10

9

8

7

6

5

4

3

2

1

1 2

12

21

Figure 7: Board PCB Layout - Bottom Layer



Figure 8: LED Board Component Placement Guide - Top Layer

2

1

2

1

2

1

2

1

2

1

2

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1

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1

2

1

2

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2

1

2

1

2

1

2

1

2

1

2

1

2

1

Figure 9: LED Board PCB Layout - Top Layer



Figure 10: LED Board Component Placement Guide - Bottom Layer

16

15

14

13

12

11

10

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6 12

11

10

9

8

7

Figure 11: LED Board PCB Layout - Bottom Layer

Copyright © 2019 Lumissil Microsystems. All rights reserved. Lumissil Microsystems reserves the right to make changes to this specification and its products at any time without notice. Lumissil Microsystems assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products. Lumissil Microsystems does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless Lumissil Microsystems receives written assurance to its satisfaction, that: a.) the risk of injury or damage has been minimized; b.) the user assume all such risks; and c.) potential liability of Lumissil Microsystems is adequately protected under the circumstances



REVISION HISTORY

Revision Detail Information Date

A Initial release 2019.10.16



APPENDIX Ⅰ: IS31FL3736B Arduino Test Code V01A

#include<Wire.h>

#include<avr/pgmspace.h>

#define Addr_GND_GND 0xa0//AD1 open (R7 pull-low), ADDR2=GND

#define Addr_GND_VCC 0xa6//AD1 = VIO, ADDR2=GND

#define Addr_GND_SCL 0xa2//AD1 = SCL, ADDR2=GND

#define Addr_GND_SDA 0xa4//AD1 = SDA, ADDR2=GND

void setup()

{

Wire.begin();

Wire.setClock(800000);//I2C 800kHz

IS31FL3736B_init();

}

void loop()

{

IS31FL3736B_Test_mode1();//breath mode

}

void IS_IIC_WriteByte(uint8_t Dev_Add,uint8_t Reg_Add,uint8_t Reg_Dat)

{

Wire.beginTransmission(Dev_Add/2); // transmit to device address

Wire.write(Reg_Add); // sends register address

Wire.write(Reg_Dat); // sends register data

Wire.endTransmission(); // stop transmitting

}

void IS31FL3736B_init(void)//white LED

{

uint8_t i;

IS_IIC_WriteByte(Addr_GND_GND,0xFE,0xc5);//Unlock FDh

IS_IIC_WriteByte(Addr_GND_GND,0xFD,0x03);//Turn to page 3: function registers

IS_IIC_WriteByte(Addr_GND_GND,0x00,0x00);//Enable software shutdown

IS_IIC_WriteByte(Addr_GND_GND,0xFE,0xc5);//Unlock FDh

IS_IIC_WriteByte(Addr_GND_GND,0xFD,0x00);// Turn to page 0: control registers

for(i=0;i<0x18;i=i+1)IS_IIC_WriteByte(Addr_GND_GND,i,0xff);//open all LED

//can use buffer write type as figure 7 in datasheet

IS_IIC_WriteByte(Addr_GND_GND,0xFE,0xc5);//unlock FDh

IS_IIC_WriteByte(Addr_GND_GND,0xFD,0x01);//Turn to page 1: PWM registers

for(i=0;i<192;i++)IS_IIC_WriteByte(Addr_GND_GND,i,0x00);//Set PWM data to 0

//can use buffer write type as figure 7 in datasheet




IS_IIC_WriteByte(Addr_GND_GND,0xFD,0x03);//Turn to page 3: function registers

IS_IIC_WriteByte(Addr_GND_GND,0x00,0x01);//Release software shutdown to normal operation

IS_IIC_WriteByte(Addr_GND_GND,0x01,0xff);//global current

}

void IS31FL3736B_Test_mode1(void)//white LED

{

uint8_t i;

while(1)

{



for(i=0;i<192;i++)IS_IIC_WriteByte(Addr_GND_GND,i,0x10);//update all PWM with 0x10

delay(1000); // wait for a second



for(i=0;i<192;i++)IS_IIC_WriteByte(Addr_GND_GND,i,0x80); //update all PWM with 0x80

delay(1000); // wait for a second

}

}

12×8 DOTS MATRIX LED DRIVER

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