Pinouts
The default I2C address on each of the boards is 0x47.
- Vin - this is the power pin. Since the sensor chip uses 3VDC, we have included a voltage regulator on board that will take 3-5VDC and safely convert it to 3VDC. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V micro like Arduino, use 5V. Vin is the far left pin when looking at the top of the breakout.
- 3Vo - this is the 3.3V output from the voltage regulator, you can grab up to 100mA from this if you like
- GND - common ground for power and logic
- SCL - the I2C clock pin, connect to your microcontroller's I2C clock line.
- SDA - the I2C data pin, connect to your microcontroller's I2C data line.
- STEMMA QT - These connectors allow you to connectors to dev boards with STEMMA QT connectors or to other things with various associated accessories
Leave the CS pin disconnected for I2C use.
The SDO pin is also the I2C address select pin. Connecting this pin to GND will make the I2C address 0x46 instead of the default 0x47. SDO is the pin between SCL and SDA. There is also a jumper on the back of the breakout for making this connection more permanently.
On the back of the BMP58xx breakouts there is an addr jumper for the SDO pin that can be soldered closed to change the I2C address to 0x46 more permanently.
If this jumper is not soldered closed then the I2C address will be 0x47.
All pins going into the breakout have level shifting circuitry to make them 3-5V logic level safe. Use whatever logic level is on Vin!
- SCL - This is also the SPI Clock or SCK pin, its an input to the chip and can use 3 - 5V logic.
- SDO - this is the Serial Data Out / Microcontroller In Sensor Out pin, for data sent from the BMP3xx to your processor. Logic level is 3.3V output, so can be read by 5V microcontrollers. SDO is the pin between SCL and SDA.
- SDA - this is the Serial Data In / Microcontroller Out Sensor In pin, for data sent from your processor to the BMP5xx. Its an input to the chip and can use 3 - 5V logic.
- CS - this is the Chip Select pin, drop it low to start an SPI transaction. Its an input to the chip and can use 3 - 5V logic.
If you want to connect multiple BMP5xx sensors to one microcontroller, have them share the SDA, SDO and SCL pins. Then assign each one a unique CS pin.
- INT - this is the Interrupt pin. The BMP5xx can send an output signal to tell you when data is read (we don't use this in our libraries but it is available for your use). The logic level is 3.3V output, so it can be read by 5V microcontrollers.
Page last edited April 20, 2026
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