16-Channel Digital Input & Output GPIO Expansion Board, I2C/IIC Module

This compact expansion module utilizes the PCA9555A/TCA9555 chip to multiply a single microcontroller pin into sixteen independently configurable digital input or output channels. The unit operates on 1.65V to 5.5V and is constructed with an ABS housing for standard electronics assembly. 1. Compatible with standard breadboards due to its 800mil single-row pin spacing spanning 20.32mm. 2. Supports programmable configuration of channel operating modes, signal polarity, and current drive capability via internal registers. 3. Includes status indicator LEDs on all sixteen ports that illuminate at logic 0, featuring a common anode design with 2k current-limiting resistors. 4. Functions across a 1.65V to 5.5V operating range while maintaining low power consumption during continuous use. 5. Package contains one green expansion board module.