PCA9531 Overview
The PCA9531 is an 8-bit I2C & SMBus I/O expander optimized for dimming LEDs in 256 discrete steps for Red/Green/Blue (RGB) color mixing and back light applications. The PCA9531 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 can not be seen and then...
PCA9531 Key Features
- Eight LED drivers (on, off, flashing at a programmable rate)
- Two selectable, fully programmable blink rates (frequency and
- 256 brightness steps
- Input/outputs not used as LED drivers can be used as regular
- Internal oscillator requires no external ponents
- I2C interface logic patible with SMBus
- Internal power-on reset
- Noise filter on SCL/SDA inputs
- Active low reset input
- Eight open drain outputs directly drive LEDs to 25 mA