PCA9685PW,118
Overview
The PCA9685PW,118 is an I2C-bus controlled 16-channel LED controller optimized for Red/Green/Blue/Amber (RGBA) color mixing and LCD backlighting applications. Each of the 16 outputs has its own 12-bit resolution (4096 steps) fixed frequency individual PWM controller with a programmable duty cycle from 0 percent to 100 percent. The device operates over a voltage range of 2.3V to 5.5V and features an internal oscillator that requires no external components.
Why Choose This Part
The 12-bit resolution provides significantly smoother dimming curves than standard 8-bit MCU PWM outputs. It features a programmable LED output delay to stagger switching times and reduce EMI by preventing simultaneous current surges across all 16 channels.
Applications
Key Specifications
Getting Started
Connect the PCA9685 to a microcontroller via the I2C interface, ensuring pull-up resistors are present on the SDA and SCL lines. The device address is hardware-selectable via pins A0 through A5, allowing up to 62 devices on a single bus. Numerous open-source libraries are available for Arduino and Raspberry Pi platforms to simplify register configuration for PWM frequency and duty cycles.
