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The OSEPP I²C Expansion Shield is an Arduino-Compatible daughter (extension) card. It provides easy interconnection with other I²C devices, such as the OSEPP Sensor Modules family. As well, it integrates an I²C switch that provides 4 additional isolated I²C buses to enable the use without collisions of multiple I²C devices with same I²C addresses. The main I²C bus and each of the 4 additional I²C bus are brought out to a robust latchable 4-pin connector that allow easy plug and play functionality.



  • 1-to-4 I²C switch to provide four isolated I²C buses
  • Stackable with other Arduino and Arduino Compatible shields
  • Provides pass through of all I/O as well as reset button and ICSP connector.
  • Three selectable address bits for I²C switch to allow stacking of up to eight Shields
  • Supports boards with the Arduino Shield interface, such as (but not limited to):
    • Duemilanove
    • Uno
    • Pro
    • Bluetooth
    • Mega/Mega 2560
  • Works with 3.3 V and 5 V boards
  • Plug and play I²C connectors that provide I²C, power, and ground signals



I²C Addresses (7-bit) 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77
Form Factor 53.3 mm x 68.6 mm
Power Consumption 0.1 mW
Connector Pin Definition Pin 1: Power
Pin 2: I2C Data
Pin 3: Ground
Pin 4: I2C Clock


OSEPP™ I²C Expansion Shield Schematic
Texas Instruments PCA9546A 4-Channel I²C Switch Data Sheet (PDF)
Stock Code Product Name
I2CSHD-01 OSEPP™ I²C Expansion Shield