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Description
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.
Connect Diagram
Features
- 8 general input/output pins
- 16 general output pins
- Built-in driving circuit, up to 15mA continuous driving current
Specifications
- 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”
Resources
Pinout
| NO. | Silkscreen | Description |
| 1 | + | Power + |
| 2 | - | Power - |
| 3 | SCL | I2C clock line |
| 4 | SDA | I2C data line |
| 5 | GPIO | Input and output pin |
| 6 | GPO | Output pin |
Pin Mode
| Pin | Configurable Mode | Default |
| GPO | Open-drain output and push-pull output | Push-pull output high level |
| GPIO | Input and output | Pull-up input |
Package Contents
- 1x Gravity: CH423 I2C 24 Digital IO Expansion Module
- 1x Gravity-4P I2C/UART Sensor cable
