1. I2C interface control, 16 I/O ports can be expanded with only 2 signal wires 2. Support 16-channel common anode constant-current LED drive, 256 step linear dimming, current controllable 3. The change of input port status can generate interrupt output () 4. I2C communication address can be set, and the communication address can be modified by short-circuiting A0/A1 solder joint 5. Two interface types of PH2.0 terminal and pad are provided, and multiple I2C modules are supported in parallel On-board level conversion circuit, compatible with 3.3V/5V working level Product parameters: Working voltage: 2.4~5.5V Working temperature: - 40~85 C Low standby current:Less than 0.1uA Control interface: I2C Number of expansion I/O ports: 16 Hardware connection: support for motherboard, motherboard, STM32 development board Product size: 38 x 23mm Colour:blue Material:PCB Package Contents: 1 x IO expansion module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.