This is an IO expansion module that based on the chip MCP23017. The module can expand additional 16 IOs. It can set 8 I2C addresses, which means with this module, the microcontroller can connect 8 modules, and expand 128 IOs at most. The module solves insufficient IO ports problem in applications like robots and interactive medias.

This Gravity: MCP23017 I2C IO 16 digital IO expansion module has 2 groups of IO pins, GPIOA and GPIOB. Each group has 8 independent IO interfaces, and each IO interface can be set to input, output, pull-up input (connect to 100KΩ pull-up resistor), interrupt and so on.

Besides, the module has 2 interrupt signal pins: IA and IB. IA is used to detect the interruption in IO interfaces of GPIOA, and IB is used to detect the interruption in IO interfaces of GPIOB. When one pin of GPIOA or GPIOB interrupts, the corresponding IA or IB will produce a high-level signal.

This IO expansion board based on the CH423 chip extends 24 digital ports via I2C, including 8 GPIOs with interrupt functions and 16 GPOs.

CH423 has a built-in current drive circuit that offers a 15mA continuous drive current, which can statically drive 24 LED tubes or dynamically drive 128 LEDs. This CH423 I2C to GPIO IO expander is suitable for projects involving LED tubes, dot matrix screens, light cubes, etc.

Features:

16 digital Port

Supporting to expand 128 IOs at most
Multiple IO mode
Changeable I2C address by dial switch
Multiple VCC and GND pins leaded
Compatible with both 3.3V and 5V
Sensor:
Robots
Interactive medias
Light cube

24 digital ports

8 general input/output pins
16 general output pins
Built-in driving circuit, up to 15mA continuous driving current

Application:

16 digital Port

robots and interactive medias

24 digital ports

Driving LED lights
Driving Dot matrix screen
Driving Light Cubes

Specifications:

16 digital Port

Operating Voltage: 3.3V~5.5V
I2C Address: 0x20~0x27
Digital Input/Output: 20Ma
Signal Interrupt Pin: IA, IB
Dimension: 44x32mm / 1.73x1.26inch

24 digital ports

Power Supply: 3.3V~5V
Static Current: 1mA
IO Continuous Driving Current: 15mA
Communication: I2C
I2C Address: 0x20-0x3F(The module occupies I2C address of 0x20-0x3F and cannot work with I2C device in this address range.)
Operating Temperature Range: -20℃~80℃
Size: 45*37mm/1.78*1.46”