16 way I/O extension module of the 12C interface, adopts MCP23017 chip of MicroChip. Each IO can be discretionarily configured as input or output, and can set pull up resistort. The IO configured as input can start interrupt function. The IO interface has a strong driving capacity, and the sink current and pull current can reach 25mA. MCP23017 is a high-speed IIC interface. It supports the IIC frequency of 100KHz, 400KHz and 1.7MHz. The chip has 3 address pins, which can set up to 8 different addresses. So 8 modules can be connected through two IIC buses to achieve up to 128 IO extensions. This module is flexible in configuration and strong in driving ability. There are many parallel connections.

Specification:

• Operating voltage: 3.0V-5.5V
• Drive chip: MCP23017
• Number of IO: 16 (input, output, interruption)
• Drive power supply: 25mAh
• 12C frequency: 100KHz, 400KHz, 1.7MHz
• Working temperature: -40? to 125?
• Chip level: Industrial grade
• Parallel multiple: Up to 8
• Drive Program: 51 and Arduino
• Size: Approx. 65mm x 19mm

Pin description:

VCC	Power source input, 3.0V-5.5V
GND	Power negative electrode, 0V
SCL	12C clock line, SCL of connecting MCU IO pin or MCU 12C interface
SDA	12C data line, SDA of connecting MCU IO pin or MCU 12C interface
RST	Chip restoration, Low level effective, connecting MCU IO pin or unconnected
ITA	GPIOA port interrupt output, Connect MCU IO pin, without connection when interruption
ITB	GPIOB port interrupt output, Connect MCU IO pin, without connection when interruption