Specification: Origin: Mainland China Type: Module Condition: New Description: This module uses the chips TCA9555 and PCA9555 to realize the conversion of I2C to GPIO. The operating voltage of TCA9555 or PCA9555A is 1.65V to 5.5V, while PCA9555 (without the A suffix) is 2.3V to 5.5 V. TCA9555 is compatible with PCA9555A and can be replaced directly. The screen printing logo of the TCA9555 TSSOP-24 packaged chip is PW555. For details, please refer to its chip manual. The module size is: 33.5mm x 23.5 mm. J1-J2 single row pin spacing: 800mil (2.54mmx8=20.32mm).Suitable for access to breadboards. All 16 IO ports have LED indicators. The LED is designed with a common anode and uses a 2k resistor to limit the current; when the output of the IO port is logic 0, the LED lights up. Product size: 34.00x24.00x12.00mm/1.34x0.94x0.47inch Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x Module 1. Multi-Channel Expansion: The module, featuring TCA9555 and PCA9555A, offers multiple configurable input/output channels, allowing you to expand a single I/O pin into many. 2. Digital Input/Output: This expansion board supports both digital input and output, enabling you to input external signals into a microcontroller or output signals from the microcontroller to external devices. 3. Low Power Consumption: Designed with low power consumption in mind, this muti-channel expansion board minimizes power usage during operation, making it ideal for applications requiring long-term use and extended battery life. 4. Programmable Features: The expansion module is highly programmable, allowing you to set the working mode, polarity, and current drive capability of input/output channels through configuration registers. 5. High Reliability and Stability: Built with premium components and reliable circuit design, this expansion module ensures high reliability and stability for your projects.