- Vin - this is the power pin. Since the sensor chip uses 3.3 VDC, we have included a voltage regulator on board that will take 3-5VDC and safely convert it down. 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, for a feather use 3.3V
- 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
- SCK - I2C clock pin, connect to your microcontroller's I2C clock line. This pin is level shifted so you can use 3-5V logic, and there's a 10K pullup on this pin.
- SDI - I2C data pin, connect to your microcontroller's I2C data line. This pin is level shifted so you can use 3-5V logic, and there's a 10K pullup on this pin.
- STEMMA QT - These connectors allow you to connectors to dev boards with STEMMA QT connectors or to other things with various associated accessories
- SDO - I2C Address pin. Pulling this pin low to GND will change the I2C address from 0x5D to 0x5C
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!
- SCK - SPI Clock pin, its an input to the chip
- SDO - Serial Data Out / Microcontroller In Sensor Out pin, for data sent from the LPS25 to your processor
- SDI - Serial Data In / Microcontroller Out Sensor In pin, for data sent from your processor to the LPS25
- CS - this is the Chip Select pin, drop it low to start an SPI transaction. Its an input to the chip
If you want to connect multiple LPS25's to one microcontroller, have them share the SDI, SDO and SCK pins. Then assign each one a unique CS pin.