NXP PCA9685 16路12位LED驱动控制方案

NXP公司的PCA9685是16路12位PWM不是Fm+I2C总线LED控制器,每个LED输出有它独立的12位分辨率(4096步)固定频率PWM控制器,工作频率从40Hz到1000Hz,占空比从0%到100%.工作电压2.3 V 到5.5 V,主要用在RGB或RGBA LED驱动器,LED状态显示器,LED显示器,LCD背光和手机或手持设备的键盘背光.本文介绍了PCA9685主要特性和优势,方框图以及典型应用电路图和LCD背光应用电路图.

PCA9685: 16-channel, 12-bit PWM Fm+ I2C-bus LED controller

The PCA9685 is an I2C-bus controlled 16-channel LED controller optimized for LCD Red/Green/Blue/Amber (RGBA) color backlighting applications. Each LED output has its own 12-bit resolution (4096 steps) fixed frequency individual PWM controller that operates at a programmable frequency from a typical of 40 Hz to 1000 Hz with a duty cycle that is adjustable from 0 % to 100 % to allow the LED to be set to a specific brightness value. All outputs are set to the same PWM frequency.
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