Gravity - CH423 I2C 24 Digital IO Expansion Module - 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.

Gravity - expander CH423 I2C - 24 I/O - DFRobot DFR0979.

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

• 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

• Gravity - CH423 I2C pin expander - 24 I/O - DFRobot
• Connection cable with Gravity 4-pin connector - 1 piece

Components included in the set.

• Manufacturer's website: DFRobot DFR0979
• User Guide
• Layout diagram
• Board dimensions