- 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 - this is the I2C clock pin, connect to your microcontrollers I2C clock line.
- SDI - this is the I2C data pin, connect to your microcontrollers I2C data line.
Leave the SDO and CS pins disconnected
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 - This is also the SPI Clock pin, its an input to the chip
- SDO - this is the Serial Data Out / Microcontroller In Sensor Out pin, for data sent from the LPS35HW to your processor
- SDI - this is also the Serial Data In / Microcontroller Out Sensor In pin, for data sent from your processor to the LPS35HW
- 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 LPS35HW's to one microcontroller, have them share the SDI, SDO and SCK pins. Then assign each one a unique CS pin.
- INT is the interrupt output pin. You can configure the interrupt to trigger for various 'reasons' such as going over or under a configured pressure threshold. Voltage level is the same as Vcc.