Item Type: IO Expansion Board <br>Material: PCB <br>Working Voltage: 2.4-5.5V <br>Working Temperature: Minus40 to 80℃ <br>Control Interface: I2C <br>Number of Expansion I/O Ports: 16 <br>VCC: Positive power supply, can be connected to 3.3V/5V power supply <br>GND: Power Ground <br>SDA: I2C Data Line <br>SCL: I2C Clock Line <br>INT: Interrupt Output <br>RST: Hardware Reset <br>Size: Approx. 38 x 23mm / 1.5 x 0.9in1、Compatibility Level: Changes in the state of an input port can generate an interrupt output (INT). On board level conversion circuit, compatible with 3.3V/5V working level. <br>2、Support 4 Expansion Modules: I2C communication address can be set, short circuit AO, A1 solder joint can modify the communication address, support the use of 4 expansion modules. <br>3、I2C Interface Control: I2C interface control, only 2 signal lines are needed to expand 16 I/O ports. <br>4、Current Controllable: The Extension module supports 16 channel common anode constant current ED drive, 256 step linear dimming, and current controllable. <br>5、Two Interface Types: The I2C interface expand board provides two interface types, PH2.0 terminal and pad, and supports parallel connection of multiple I2C modules.1 x <br> <br>IO&nbsp;Expansion&nbsp;Board<p>1 x For Dupont Wire<br></p>