The PCA9530D,112 is a 2-bit I²C-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.
Input/output not used as LED drivers can be used as regular GPIOs
Internal oscillator requires no external components
Internal power-on reset
Noise filter on SCL/SDA inputs
Active low reset input
2 Open-drain outputs directly drive LEDs to 25mA
Edge rate control on outputs
No glitch on power-up
All input and output pins are protected against ESD under normal handling. When handling ensure that the appropriate precautions are taken.
