NXP PCA9635 16位RGBA彩色LED驱动方案
NXP 公司的PCA9635是I2C总线控制的16位红/绿/蓝/琥珀(RGBA)彩色LED驱动器,每个LED输出有8位分辨率(256级)的单独PWM控制器,工作频率97kHz,占空比从0%到99.6%可调,使LED设定特定的亮度.另外的8位分辨率群PWM控制器有固定频率190Hz和在24Hz到10.73秒的可调频率, 占空比从0%到99.6%可调. PCA9635主要用作RGB或RGBA LED驱动器,LED显示器,LCD背光以及手机或手提设备的键盘背景光.本文介绍了PCA9635主要特性, 方框图, 典型应用电路和开关时间测试电路.
PCA9635: 16-bit Fm+ I2C-bus LED driver
The PCA9635 is an I2C-bus controlled 16-bit LED driver optimized for Red/Green/Blue/Amber (RGBA) color mixing applications. Each LED output has its own 8-bit resolution (256 steps) fixed frequency individual PWM controller that operates at 97 kHz with a duty cycle that is adjustable from 0 % to 99.6 % to allow the LED to be set to a specific brightness value. An additional 8-bit resolution (256 steps) group PWM controller has both a fixed frequency of 190 Hz and an adjustable frequency between 24 Hz to once every 10.73 seconds with a duty cycle that is adjustable from 0 % to 99.6 % that is used to either dim or blink all LEDs with the same value.
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