{"title":"Gravity: CH423 I2C 24 Digital IO Expansion Module","handle":"gravity-ch423-i2c-24-digital-io-expansion-module","url":"/products/gravity-ch423-i2c-24-digital-io-expansion-module","description":"The Gravity CH423 I2C 24 Digital IO Expansion Module extends your microcontroller with 24 additional digital output/input pins over a standard I2C connection. Based on the CH423 chip, it provides 8 GPIOs with interrupt support and 16 dedicated GPOs.\n\nThe built-in current drive circuit delivers up to 15 mA continuous current per pin, allowing it to statically drive 24 LED tubes or dynamically drive up to 128 LEDs — making it well suited for LED matrix displays, light cubes, and indicator arrays.\n\nKey Features\n\n\n24 Digital Pins – 8 GPIO (with interrupt) + 16 GPO\n\nBuilt-In Current Drive – Up to 15 mA continuous per pin\n\nI2C Interface – Gravity-compatible 4-pin connector\n\nWide Voltage Range – 3.3 V to 5 V supply\n\nLED Drive Capability – Static drive for 24 LEDs or dynamic drive for up to 128 LEDs\n\n\nSpecifications\n\n\nChip: CH423\n\nPower Supply: 3.3–5 V\n\nStatic Current: 1 mA\n\nIO Continuous Drive Current: 15 mA\n\nInterface: I2C\n\nI2C Address Range: 0x20–0x3F (occupies the full range; cannot share with other I2C devices at these addresses)\n\nOperating Temperature: −20 °C to +80 °C\n\nBoard Size: 45 mm × 37 mm (1.78″ × 1.46″)\n\n\n\nNote: This module occupies I2C addresses 0x20–0x3F. It cannot be used alongside other I2C devices within this address range.\n\n\nIdeal For\n\nLED tube and dot matrix displays\nLight cubes and LED arrays\nGPIO expansion for pin-limited microcontrollers\nIndicator panels and control systems\n\n\nPackage Contents\n\n1× Gravity CH423 I2C 24 Digital IO Expansion Module\n1× Gravity 4-pin I2C/UART sensor cable\n\n\nResources\n\nProduct Wiki\nSchematic (PDF)\nDimensions (PDF)\n","vendor":"DFRobot","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":1808,"title":"Default Title","sku":"DF-DFR0979","price":7.8,"on_sale":false,"in_stock":true,"available_quantity":198,"option1":"Default Title"}]}