39×9 DOTS MATRIX LED DRIVER

Integrated Silicon Solution, Inc. – ams.issi.com 1 Rev. B, 12/19/2018

DESCRIPTION

The IS31FL3741 is a general purpose 39×9 LED Matrix programmed via an I2C compatible interface. Each LED can be dimmed individually with 8-bit PWM data and 8-bit scaling data which allowing 256 steps of linear PWM dimming and 256 steps of DC current adjustable level. Additionally each LED open and short state can be detected, IS31FL3741 store the open or short information in Open-Short Registers. The Open-Short Registers allowing MCU to read out via I2C compatible interface. Inform MCU whether there are LEDs open or short and the locations of open or short LEDs. FEATURES

 Supply voltage range from 2.7V to 5.5V  39 Current Sink × 9 SW matrix size: drive up to

351 LEDs or 117 RGBs  Individual 256 PWM control steps  Individual 256 DC current steps  Global 255 current setting  SDB rising edge reset I2C module  Interrupt and state lookup registers  Individual open and short error detect function  De-ghost  QFN-60 (7mm×7mm) package QUICK START

Figure 1: Photo of IS31FL3741 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 IS31FL3741 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) Connect 3V and P2. 2) Connect SDA and P1. 3) Connect SCL and P3. 4) Connect SDB and P4 5) Connect PVCC and SDB. 6) 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.

EVALUATION BOARD OPERATION

The IS31FL3741 evaluation board has three animation display modes. Press K1 to switch configurations.

1) Rainbow wave#1 2) Rainbow wave#2 3) Rain 4) Visor Note: IS31FL3741 solely controls the FxLED function on the evaluation board.

ORDERING INFORMATION

Part No. Temperature Range Package

IS31FL3741-QFLS4-EB -40°C to +125°C (Industrial) QFN-60, Lead-free

Table 1: Ordering Information For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at analog@issi.com or (408) 969-6600.

39×9 DOTS MATRIX LED DRIVER

Integrated Silicon Solution, Inc. – ams.issi.com 2 Rev. B, 12/19/2018

SOFTWARE SUPPORT

P2 and 3V default setting is closed (jumper on). If it is open (no jumper), the on-board MCU will configure its own I2C/SDB/ADDR pins to High Impedance status so an external source can driver the I2C/SDB signals to control the IS31FL3741 LED driver.

The ADDR pin is pulled high via R6 setting the device address of IS31FL3741 to 0x60.

GND

SDA SCL

SDB VCC

Figure 2: Photo of Arduino UNO connected to Evaluation Board

The steps listed below are an example using the Arduino for external 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. Also download the Wire.h library from www.arduino.cc/en/reference/wire and verify that pgmspace.h is in the directory …program Files(x86)/Arduino/hardware/tools/avr/avr/include/avr /. Then download the latest IS31FL3741 test firmware (sketch) from the ISSI website http://www.issi.com/US/product-analog-fxled-driversh tml.

1) Open P2 and 3V. 2) Open PVCC and SDB. 3) Connect the 5 pins from Arduino board to

IS31FL3741 EVB: a) Arduino 5V pin to IS31FL3741 EVB PVCC. b) Arduino GND to IS31FL3741 EVB GND. c) Arduino SDA (A4) to IS31FL3741 EVB P1. d) Arduino SCL (A5) to IS31FL3741 EVB P3. e) If Arduino use 3.3V MCU VCC, connect

3.3V to IS31FL3741 EVB SDB, if Arduino use 5.0V MCU VCC, connect 5.0V to EVB SDB. (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) from the ISSI website, a .txt file and copy the code to Arduino IDE, compile and upload to Arduino.

5) Run the Arduino code as appendix I. 6) In EVB code, the ADDR pin is pulled low via

100k, so the device address is 0x60. When P1~P4 are disconnect, the ADDR pin can be changed by connecting the ADDR as follows: a) ADDR=VCC, device address=0x66. b) ADDR=SCL, device address=0x62. c) ADDR=SDA, device address=0x64.

Please refer to the datasheet to get more information about IS31FL3741.

39×9 DOTS MATRIX LED DRIVER

Integrated Silicon Solution, Inc. – ams.issi.com 3 Rev. B, 12/19/2018

GND

3V

SDA_M SCL_M

INTB

USB_DM2 USB_DP2 DIO GND 3V

GND

10nF

C7

VIN1

GND2

EN3

BP 4

VOUT 5

U2

LDO

1uF C9

3V

CLK

1uF C4

3V

0.1uF

C2

0.1uF

C1

MCU

3V Power

100K R6

1KR1

K1

1uF C6

0.1uF

C3

10K R46

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

CON4 GND GND

CLK DIO 3V INTB

SDA SCL

ADDR GND SCL SDA

PVCC

SDB

3V

SDB_M

Micro USB

VCC1

USB_DM2

USB_DP3

NC4

GND5

Con5

10uF

C10

PVCC

22RR48 22RR49

USB_DM2 USB_DP2

1.5K

R47 3V

USB_DM USB_DP

10uF

C11

D1

DFL240 D2

DFL240

IO

PVCC

SDA SCL INTB SDB

ADDR

3V

10K R5

PVCC

PVCC

1KR2 100KR3 100KR4

SW01 SW02 SW03 SW04 SW05 SW06

CS01 CS02 CS03 CS04 CS05 CS06 CS07 CS08 CS09 CS10 CS11 CS12 CS13 CS14 CS15 CS16 CS17 CS18 CS19 CS20 CS21 CS22 CS23 CS24 CS25 CS26 CS27 CS28 CS29 CS30

GND

PVCC PVCC PVCC

GND

SDB

OSCO 2

OSCI4 GND 1

GND3 Y1

8M

33P C8

33P

C5

OSCO

OSCI

OSCI OSCO

PVCC

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_BKIN 25 PB13/SPI2_SCK/TIM1_CH1N 26

PB14/SPI2_MISO/TIM1_CH2N 27 PB15/SPI2_MOSI/TIM1_CH3N 28

PA8/TIM1_CH1/MCO 29 PA9/USART1_TX/TIM1_CH2 30

PA10/USART1_RX/TIM1_CH3 31 PA11/CANRX/USBDM/TIM1_CH4 32 PA12/CANTX/USBDP/TIM1_ETR 33

PA13/JTMS/SWDIO 34 VSS_2 35

VDD_2 36 PA14/JTCK/SWCLK 37

PA15/JTDI 38 PB3/JTDO 39

PB4/JNTRST 40 PB5 41

PB6/I2C1_SCL/TIM4_CH1 42 PB7/I2C1_SDA/TIM4_CH2 43

BOOT0 44 PB8/TIM4_CH3 45 PB9/TIM4_CH4 46

VSS_3 47 VDD_3 48

U3

STM32F103C8T6

20RCS30 20RCS29 20RCS28 20RCS27 20RCS26 20RCS25 20RCS24 20RCS23 20RCS22 20RCS21 20RCS20 20RCS19 20RCS18 20RCS17 20RCS16 20RCS15 20RCS14 20RCS13 20RCS02 20RCS11 20RCS10 20RCS09 20RCS08 20RCS07 20RCS06 20RCS05 20RCS04 20RCS03 20RCS02 20RCS01 SINK01

SINK02 SINK03 SINK04 SINK05 SINK06 SINK07 SINK08 SINK09 SINK10 SINK11 SINK12 SINK13 SINK14 SINK15 SINK16 SINK17 SINK18 SINK19 SINK20 SINK21 SINK22 SINK23 SINK24 SINK25 SINK26 SINK27 SINK28 SINK29 SINK30

RSET

3V

SW01 SW02 SW03 SW04 SW05 SW06

SINK01 SINK02SINK03 SINK04SINK05 SINK06SINK07

SINK08SINK09 SINK10SINK11 SINK12SINK13 SINK14SINK15 SINK16SINK17 SINK18SINK19 SINK20SINK21 SINK22SINK23

SINK24SINK25 SINK26SINK27 SINK28SINK29 SINK30

CS34 1 CS35 2 CS36 3 CS37 4 CS38 5 CS39 6

INTB7

ADDR8

SDA9

SCL10

SDB11

GND12

RSET13

AVCC14

PVCC115

SW1 16 SW2 17 SW3 18 SW4 19 SW5 20 SW6 21 SW7 22 SW8 23 SW9 24

PVCC225

CS1 26 CS2 27 CS3 28 CS4 29 CS5 30 CS6 31 CS7 32 CS8 33 CS9 34

CS10 35

GND36

CS11 37 CS12 38 CS13 39 CS14 40 CS15 41 CS16 42 CS17 43 CS18 44 CS19 45 CS20 46 CS21 47 CS22 48 CS23 49 CS24 50 CS25 51 CS26 52 CS27 53 CS28 54

GND55

CS29 56 CS30 57 CS31 58 CS32 59 CS33 60

GND61

U1

IS31FL3741_QFN60

SW07 SW08 SW09

20RCS31 20RCS32 20RCS33 20RCS34 20RCS35 20RCS36 20RCS37 20RCS38 20RCS39

CS31 CS32 CS33 CS34 CS35 CS36 CS37 CS38 CS39

SINK31 SINK32 SINK33 SINK34 SINK35 SINK36 SINK37 SINK38 SINK39

SINK31 SINK32SINK33 SINK34SINK35 SINK36SINK37 SINK38SINK39

IS31FL3741_QFN60

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

CON1

Header 8X2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

CON2

Header 8X2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

CON3

Header 8X2

SW07 SW08 SW09

1 2

P1

Header 2

1 2

P3

Header 2

1 2

P4

Header 2

SDA_M SDA

SCL_M SCL