Product description: Gravity - expander CH423 I2C - 24 I/O - DFRobot DFR0979
The CH423 pin expander from DFRobot allows you to expand the system by up to 24 additional digital I/O ports via the I2C interface. Among them, there are 8 GPIOs with interrupt functions and 16 GPIOs. The module is equipped with a Gravity connector and standard goldpin pins with a pitch of 2.54 mm. The supply voltage ranges from 3.3 V to 5 V. It is used in applications related to LED lighting or matrix displays. It is also used as an element extending applications with light points of any projects.
Arduino compatible product
The manufacturer has prepared a detailed user guide and library for Arduino users.
Gravity - expander CH423 I2C - 24 I/O - DFRobot DFR0979.
Pinout description and connection diagram
The module has a Gravity connector, which should be used to connect it to the Arduino board. Each lead has been additionally described, which significantly facilitates connection.
- "+" - VCC - power pin in the range from 3.3 V to 5 V DC
- "-" - GND - system ground
- "C" - SCL - clock line of the I2C interface
- "D" - SDA - I2C interface data line
- GPIO - input / output pins
- GPO - output pins
You will also find sample program code in the user's guide .
Module technical specification
- Type: lead expander
- Built-in chip: CH423
- Number of pins: 24 I/O
- 8 GPIOs with interrupt functions
- 16 GPOs
- Communication interface: I2C bus
- Interface address: configurable from 0x20 to 0x3F (the module cannot be used with other I2C devices in the address range)
- Supply voltage: 3.3 V to 5 V
- Current consumption: 1mA
- I/O current capacity: 15mA
- Operating temperature range: -20°C to 80°C
- Board dimensions: 45 x 37 mm
Kit contents
- Gravity - CH423 I2C pin expander - 24 I/O - DFRobot
- Connection cable with Gravity 4-pin connector - 1 piece
Components included in the set.
