NXP PCA9532 16位I2C LED调光方案

NXP 公司的PCA9532是16位I2C总线和SMBus I/O扩展器,最适合RGB色彩混合和背景光应用的LED调光(256步). PCA9532有16个LED驱动器,有两个可选择的全编程的闪光速率(0.591 Hz -152 Hz ),256亮度等级. I2C总线接口逻辑和SMBus兼容,内部有重起重置, SCL/SDA输入有噪音滤波器.本文介绍了PCA9532的主要特性,方框图以及典型应用框图.

PCA9532: 16-bit I2C-bus LED dimmer

The PCA9532 is a 16-bit I2C-bus and SMBus I/O expander optimized for dimming LEDs in 256 discrete steps for Red/Green/Blue (RGB) color mixing and back light applications.

The PCA9532 contains an internal oscillator with two user programmable blink rates and duty cycles coupled to the output PWM. The LED brightness is controlled by setting the blink rate high enough (> 100 Hz) that the blinking cannot be seen and then using the duty cycle to vary the amount of time the LED is on and thus the average current through the LED.
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