[原創] ISSI IS32FL3738 6x8點陣LED驅動解決方案

ISSI公司的IS31FL3740是具有1/2周期的通用的6x8點陣LED驅動器,可通過I2C兼容接口進行編程,每個LED可單獨通過8位x4 PWM數據進行調光,具有線性調光512步.器件具有3個自動呼吸模式,標識為ABM-1,ABM-2和ABM-3,每個自動呼吸模式有四個計時特性和三個回路特性,而每個LED可單獨配置成自動呼吸模式或多或非自動呼吸模式.器件工作電壓2.7V-5.5V,工作溫度-40℃ 到+125℃,主要用在汽車電子,汽車集群,儀表盤和汽車內飾.本文介紹了IS31FL3740主要特性,框圖,典型應用電路,以及評估板主要特性,電路圖,材料清單和PCB元件配置圖與設計圖.

The IS32FL3738 is a general purpose 6×8 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 × 4 PWM data which allowing 512 steps of linear dimming.

IS32FL3738 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.

Additionally each LED open and short state can be detected, IS32FL3738 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.

The IS32FL3738 operates from 2.7V to 5.5V and features a very low shutdown and operational current. IS32FL3738 is available in eTSSOP-28 package. It operates from 2.7V to 5.5V over the temperature range of -40℃ to +125℃.

IS32FL3738主要特性:

· Supply voltage range: 2.7V to 5.5V
· 8 current source outputs for row control
· 6 switch current inputs for column scan control
· Up to 48 LEDs (6×8) in dot matrix
· Programmable 6×8 (16 RGBs) matrix size with deghost function
· 1MHz I2C-compatible interface
· Selectable 3 Auto Breath Modes for each dot
· Auto breath loop features interrupt pin inform MCU auto breath loop completed
· Auto breath offers 128 steps gamma current, interrupt and state look up registers
· 256 steps global current setting
· Individual on/off control
· Individual 512 PWM control steps
· Individual Auto Breath Mode select
· Individual open and short error detect function
· Cascade for synchronization of chips
· eTSSOP-28 package
· Automotive AEC-Q100 qualified

IS32FL3738應用:

· Automotive clusters
· Dashboards
· Automotive interiors

圖1. IS32FL3738框圖

[原創] ISSI IS32FL3738 6x8點陣LED驅動解決方案

圖2. IS32FL3738典型應用電路圖(6x8)

[原創] ISSI IS32FL3738 6x8點陣LED驅動解決方案

圖3. IS32FL3738典型應用電路圖(RGB)

IS32FL3738評估板

The IS32FL3738 evaluation board is fully assembled, tested and comes programmed with evaluation software. Follow the steps listed below to verify board operation.

The evaluation board comes with an Arduino compatible microcontroller circuit preloaded with IS32FL3738 demonstration firmware, called a sketch.

This allows the functionality of the IS32FL3738 to be verified before starting firmware development. 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

Then download the latest IS32FL3738 firmware (sketch) from the ISSI website

When using the Arduino environment, please select Genuino UNO as shown below, then select the serial port. Follow the standard procedure to upload the latest IS32FL3738 firmware into the Arduino; then use the IDE to modify it. There is no additional software required to run the evaluation board.

The IS32FL3738 evaluation board drives16 RGB LEDs located underneath the light dispersing filter.

Every press of the K1 switch will cycle through one of the 8 pre-programmed lighting sequences below:

1) White LED
2) Rainbow bar
3) Red color breath
4) Green color breath
5) Blue color breath
6) Pink color breath
7) Yellow color breath
8) Cyan color breath

圖4. IS32FL3738評估板外形圖

[原創] ISSI IS32FL3738 6x8點陣LED驅動解決方案