LPS33HW Water Resistant Pressure Sensor - STEMMA QT

Water-resistant pressure sensor breakout (LPS33HW) with STEMMA QT/Qwiic connectors, supporting I2C or SPI and both absolute and relative pressure in caustic or damp environments. Arduino SPI support only; CircuitPython and Raspberry Pi use I2C.

Logical pinout · physical placement not verified

VIN
Power input for the breakout; Adafruit states the onboard regulator accepts 3-5VDC and converts it to 3.3V for the sensor.
Type · PowerVoltage · 3-5VDC input
3Vo
3.3V regulator output from the breakout; Adafruit states up to 100mA can be taken from this pin.
Type · PowerVoltage · 3.3V output, up to 100mA
GND
Common ground for power and logic.
Type · GroundVoltage · 0V
SCK
I2C clock pin; also the SPI clock input when using SPI.
Type · SPIVoltage · Logic level follows VIN, 3-5V logic safe
SDI
I2C data pin; also SPI data in / MOSI for data sent from the processor to the LPS33/LPS35 sensor.
Type · SignalVoltage · Logic level follows VIN, 3-5V logic safe
SDO
SPI data out / MISO for data sent from the LPS33/LPS35 sensor to the processor; leave disconnected for I2C use.
Type · SignalVoltage · Logic level follows VIN, 3-5V logic safe
CS
SPI chip-select input; pull low to start an SPI transaction; leave disconnected for I2C use.
Type · SPIVoltage · Logic level follows VIN, 3-5V logic safe
INT
Interrupt output configurable for pressure threshold events; low-pressure threshold works in relative mode according to Adafruit.
Type · SignalVoltage · Interrupt output level is the same as Vcc
STEMMA QT
STEMMA QT / Qwiic I2C connector carrying the board I2C and power interface.
Type · UnknownVoltage · Same I2C/power interface as VIN/GND/SCK/SDI

Pin	Type	Function	Voltage
VIN	Power	Power input for the breakout; Adafruit states the onboard regulator accepts 3-5VDC and converts it to 3.3V for the sensor.	3-5VDC input
3Vo	Power	3.3V regulator output from the breakout; Adafruit states up to 100mA can be taken from this pin.	3.3V output, up to 100mA
GND	Ground	Common ground for power and logic.	0V
SCK	SPI	I2C clock pin; also the SPI clock input when using SPI.	Logic level follows VIN, 3-5V logic safe
SDI	Signal	I2C data pin; also SPI data in / MOSI for data sent from the processor to the LPS33/LPS35 sensor.	Logic level follows VIN, 3-5V logic safe
SDO	Signal	SPI data out / MISO for data sent from the LPS33/LPS35 sensor to the processor; leave disconnected for I2C use.	Logic level follows VIN, 3-5V logic safe
CS	SPI	SPI chip-select input; pull low to start an SPI transaction; leave disconnected for I2C use.	Logic level follows VIN, 3-5V logic safe
INT	Signal	Interrupt output configurable for pressure threshold events; low-pressure threshold works in relative mode according to Adafruit.	Interrupt output level is the same as Vcc
STEMMA QT	Unknown	STEMMA QT / Qwiic I2C connector carrying the board I2C and power interface.	Same I2C/power interface as VIN/GND/SCK/SDI

Logical pinout · physical placement not verified

Pin details

9 connections

VIN
Power input for the breakout; Adafruit states the onboard regulator accepts 3-5VDC and converts it to 3.3V for the sensor.
PowerVoltage · 3-5VDC input
3Vo
3.3V regulator output from the breakout; Adafruit states up to 100mA can be taken from this pin.
PowerVoltage · 3.3V output, up to 100mA
GND
Common ground for power and logic.
GroundVoltage · 0V
SCK
I2C clock pin; also the SPI clock input when using SPI.
SPIVoltage · Logic level follows VIN, 3-5V logic safe
SDI
I2C data pin; also SPI data in / MOSI for data sent from the processor to the LPS33/LPS35 sensor.
SignalVoltage · Logic level follows VIN, 3-5V logic safe
SDO
SPI data out / MISO for data sent from the LPS33/LPS35 sensor to the processor; leave disconnected for I2C use.
SignalVoltage · Logic level follows VIN, 3-5V logic safe
CS
SPI chip-select input; pull low to start an SPI transaction; leave disconnected for I2C use.
SPIVoltage · Logic level follows VIN, 3-5V logic safe
INT
Interrupt output configurable for pressure threshold events; low-pressure threshold works in relative mode according to Adafruit.
SignalVoltage · Interrupt output level is the same as Vcc
STEMMA QT
STEMMA QT / Qwiic I2C connector carrying the board I2C and power interface.
UnknownVoltage · Same I2C/power interface as VIN/GND/SCK/SDI

Start wiring

I2C · SPI · Single data line · 3.3 – 5 V · Breakout

Confirm the data interface matches your host board.

Module pins: VIN, 3Vo, GND, SCK, SDI, SDO, CS, INT. Schematik maps them to your board in the app.

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