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[原创] ISSI IS31FL3740 3x4点阵LED驱动解决方案

关键词:LED驱动器 点阵LED PWM IS31FL3740

时间:2018-09-25 10:51:09       作者:ISSI公司       来源:兴发娱乐|兴发娱乐平台(正规官网)

ISSI公司的IS31FL3740是具有1/2周期的通用的3x4点阵LED驱动器,可通过I2C兼容接口进行编程,每个LED可单独通过8位x8 PWM数据进行调光,具有线性调光1024步.器件具有3个自动呼吸模式,标识为ABM-1, ABM-2和ABM-3,每个自动呼吸模式有四个计时特性和三个回路特性,而每个LED可单独配置成自动呼吸模式或多或非自动呼吸模式.器件工作电压2.7V-5.5V,工作温度-40℃ 到+125℃,主要用在手机和其它手持设备LED显示,游戏设备和白色家电的LED应用.本文介绍了IS31FL3740主要特性,框图,典型应用电路,以及评估板主要特性,电路图,材料清单和PCB设计图.

The IS31FL3740 is a general purpose 3×4 LEDsmatrix driver with 1/12 cycle rate. The device can beprogrammed via an I2C compatible interface. EachLED can be dimmed individually with 8-bit × 8 PWMdata which allowing 1024 steps of linear dimming.

IS31FL3740 features 3 Auto Breathing Modes whichare noted as ABM-1, ABM-2 and ABM-3. For eachAuto Breathing Mode, there are 4 timing characterswhich include current rising/holding/falling/off timeand 3 loop characters which include Loop-Beginning/Loop-Ending/Loop-Times. Every LED can beconfigured to be any Auto Breathing Mode or No-Breathing Mode individually.

Additionally each LED open and short state can bedetected, IS31FL3740 store the open or shortinformation in Open-Short Registers. The Open-ShortRegisters allowing MCU to read out via I2Ccompatible interface. Inform MCU whether there areLEDs open or short and the locations of open or shortLEDs.

The IS31FL3740 operates from 2.7V to 5.5V andfeatures a very low shutdown and operational current.IS31FL3740 is available in QFN-20 (5mm×5mm) andeTSSOP-20 packages. It operates from 2.7V to 5.5Vover the temperature range of -40℃ to +125℃.

IS31FL3740主要特性:

 Supply voltage range: 2.7V to 5.5V
 4 current source outputs for row control
 3 switch current inputs for column scan control
 Up to 12 LEDs (3×4) in dot matrix
 Programmable 3×4 (4 RGBs) matrix size with deghostfunction
 1MHz I2C-compatible interface
 Selectable 3 Auto Breath Modes for each dot
 Auto breath loop features interrupt pin informMCU auto breath loop completed
 Auto breath offers128 steps gamma current,interrupt and state lookup registers
 256 steps global current setting
 Individual on/off control
 Individual 1024 PWM control steps
 Individual Auto Breath Mode select
 Individual open and short error detect function
 Cascade for synchronization of chips
 QFN-20 (5mm×5mm) and eTSSOP-20 packages

IS31FL3740应用:

 Mobile phones and other hand-held devices forLED display
 Gaming device (Keyboard, Mouse etc.)
 LED in white goods application

图1.IS31FL3740框图

图2.IS31FL3740典型应用电路(3x4)

图3.IS31FL3740典型应用电路(RGB)

IS31FL3740评估板

The IS31FL3740 evaluation board drives 8 RGB LEDslocated underneath the light dispersing filter. Everypress of the K1 switch will cycle through one of the 8pre-programmed lighting sequences below:

1) Changing color mode 1
2) Changing color mode 2
3) Pink color
4) Yellow color
5) Cyan Color
6) White color
7) Red color
8) Blue Color
9) Green color

The IS31FL3740 evaluation board is fully assembled,tested and comes programmed with evaluationsoftware. Follow the steps listed below to verify boardoperation.


图4.IS31FL3740评估板外形图

图5.IS31FL3740评估板电路图
IS31FL3740评估板材料清单-Arduino

IS31FL3740评估板材料清单-IS31FL3740


图6.IS31FL3740评估板元件配置图-顶层

图7.IS31FL3740评估板PCB布局图-顶层

图8.IS31FL3740评估板元件配置图-底层

图9.IS31FL3740评估板PCB布局图-底层

图10.Arduino板元件配置图-顶层

图11.Arduino板PCB布局图-顶层

图12.Arduino板元件配置图-底层

图13.Arduino板PCB布局图-底层
详情请见:
http://www.issi.com/WW/pdf/IS31FL3740.pdf
http://www.issi.com/WW/pdf/31FL3740_EB.pdf
IS31FL3740.pdf
31FL3740_EB.pdf

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