The default I2C address is 0x48.

Power Pins

  • VIN: This is the voltage input to power for the sensor. You can connect either 5V or 3.3V to this, depending on the logic level of the MCU you are using. (Do not exceed 5V on this pin or you will permanently damage the sensor!)
  • GND: Common ground for data and power.

I2C Logic Pins

  • SCL - I2C clock pin, connect to your microcontroller's I2C clock line. This pin has a 10K pullup to VIN
  • SDA - I2C data pin, connect to your microcontroller's I2C data line. This pin has a 10K pullup to VIN.
  • STEMMA QT - These connectors allow you to connect to development boards with STEMMA QT connectors, or to other things, with various associated accessories.

Address Pins and Jumpers

On the back of the board are two address jumpers, labeled A0 and A1, above the I2C Addr label on the board silk. These jumpers allow you to chain up to 4 of these boards on the same pair of I2C clock and data pins. To do so, you solder the jumper "closed" by connecting the two pads.

On the front of the board are two address pins, labeled A0 and A1. Just like the jumpers, these pins allow you to change the I2C address to connect multiple boards by connecting them to VIN.

The default I2C address is 0x48. The other address options can be calculated by “adding” the A0 and A1 to the base of 0x48.

A0 sets the lowest bit with a value of 1 and A1 sets the next bit with a value of 2. The final address is 0x48 + A0 + A1 which would be 0x4B.

If A0 is soldered closed, the address is 0x48 + 1 = 0x49.

If A1 is soldered closed, the address is 0x48 + 2 = 0x4A.

The table below shows all possible addresses, and whether the pin(s) should be high (closed) or low (open).

Other Pins

  • INT - This is the 'open-drain' interrupt output pin, and can be optionally connected to your MCU to trigger a HW interrupt whenever an appropriate event happens with the sensor. See the datasheet and driver for further details. It will go low or logic '0' when it is asserted.
  • CT - This 'open-drain' pin can be configured to trigger to go low or to logic '0' when a Critical Temperature (CT) threshold is passed. 

Power LED and Jumper

  • Power LED - In the upper left corner, above the STEMMA connector, on the front of the board, is the power LED, labeled on. It is the green LED.
  • LED jumper - To the right of the power LED is a jumper for the power LED. If you wish to disable the power LED, simply cut the trace on this jumper.

This guide was first published on Feb 06, 2019. It was last updated on May 21, 2024.

This page (Pinouts) was last updated on Mar 08, 2024.

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