PCA9530D,112 (NXP)

The PCA9530D,112 is a 2-bit I?C-Bus LED Dimmer optimized for dimming LEDs in 256 discrete steps for red, green and blue (RGB) colour mixing and backlight applications. The LED dimmer 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 (>100Hz) 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.