PCA9530DP
Overview
The PCA9530DP is a 2-bit I2C and SMBus compatible LED dimmer optimized for red/green/blue (RGB) color mixing and backlight applications. It features two open-drain outputs capable of sinking 25mA each, with internal programmable PWM generators that allow for independent dimming and blinking rates. This device operates over a wide voltage range of 2.3V to 5.5V and includes a hardware reset pin for system-level control.
Why Choose This Part
It reduces processor overhead by offloading PWM generation to the IC, requiring only simple I2C commands to set frequency and duty cycle. The hardware RESET pin and noise filters on the SCL/SDA lines ensure robust operation in noisy electrical environments. Additionally, the device supports hot insertion and features very low standby current of approximately 1.9uA.
Applications
Key Specifications
Getting Started
To implement the PCA9530DP, connect the SCL and SDA lines to an I2C controller with pull-up resistors and tie the RESET pin high for normal operation. Software integration involves writing to the internal registers to define the frequency and duty cycle for the two PWM channels. For prototyping, NXP's I2C-bus evaluation boards or generic TSSOP-8 breakout boards can be used with any microcontroller supporting 400kHz I2C.
