Low Voltage 24-Bit I2C-bus I/O Expander


  • I2C to 24-bit I/O ports expander
  • 1MHz Fast-mode Plus I2C bus
  • Operating voltage range of 1.65V to 5.5V for both I2C bus and I/O ports
  • Four adjustable I2C slave addresses via ADDR
  • I2C multiple-register group programming with global loop or local loop
  • Active low reset input (RESET)
  • Active low open-drain interrupt output (INT)
  • Internal power-on reset and I2C software reset
  • Noise filter on SCL/SDA inputs
  • Input/Output port configurable
  • Input with polarity/latch/pull-up/pull-down/interrupt functions
  • Allowing port input voltage above supply
  • Interrupt with trigger/mask/clear/status features
  • Programmable input debounce enable/time
  • Output with bank/pin selectable push-pull or open-drain
  • Bit-wise programmable output drive strength
  • Low standby current of 4µA typical at 3.3V
  • Maximum 25mA driving capability for each port


  • Smartphones
  • Tablets
  • Wearables
  • Laptops and Desktop computers

Key Electrical Specifications

Vin(Min) Vin(Max) Drive Current Number of I/O Interrupt Out Addresses Operating Temperature Package
1.65V 5.5V 25mA 24 Yes 4 -40°C to 85°C FO-WLP66-36 2.60 x 2.60mm
TQFN55-32 5.00 x 5.00mm

Typical Application Diagram