用GPIO扩展LED调光 NXP 2/4/8/16-bit I2C/SMBus LED dimmers PCA9530/31/32/33 LED dimming with GPIO expansion These I2C/SMBus-compatible GPIO expanders, optimized for dimming LEDs, support two user- programmable blink and dimming rates, programmable up to 256 levels of brightness, without overloading the I2C-bus or tying up the I2C-bus master. Key features Applications 4 Compatible with I2C-bus and SMBus 4 LED backlighting 4 Two user-programmable blink rates and duty cycles 4 LED color mixing ……