LPS35HWTR STMicroelectronics

LPS35HW MEMS pressure sensor: 260-1260 hPa absolute digital output barometer with water resistant package Datasheet - production data Applications Wearable devices Altimeter and barometer for portable devices GPS applications Weather station equipment Description The LPS35HW is an ultra-compact piezoresistive pressure sensor which functions as a digital output barometer. The device comprises a sensing element and an IC interface which 2 communicates through I C or SPI from the sensing element to the application. Features The sensing element, which detects absolute Pressure sensor with water resistant pressure, consists of a suspended membrane package manufactured using a dedicated process 260 to 1260 hPa absolute pressure range developed by ST. Current consumption down to 3 A The LPS35HW is available in a holed ceramic High overpressure capability: 20x full scale LGA package. It is guaranteed to operate over a Embedded temperature compensation temperature range extending from -40 C to +85 24-bit pressure data output C. The package is holed to allow external 16-bit temperature data output pressure to reach the sensing element. ODR from 1 Hz to 75 Hz Table 1: Device summary table SPI and IC interfaces Embedded FIFO Temperature Order code Package Packing range C Interrupt functions: Data Ready, FIFO flags, pressure thresholds CCLGA- Tape LPS35HWTR Supply voltage: 1.7 to 3.6 10L and reel -40 to +85 C ECOPACK lead-free compliant CCLGA- LPS35HW Tray 10L July 2016 DocID029129 Rev 1 1/48 www.st.com This is information on a product in full production. Contents LPS35HW Contents 1 Block diagram and pin description ................................................ 6 2 Mechanical and electrical specifications ....................................... 8 2.1 Mechanical characteristics ................................................................ 8 2.2 Electrical characteristics .................................................................... 9 2.3 Communication interface characteristics ........................................... 9 2.3.1 SPI serial peripheral interface ............................................................ 9 2.3.2 I2C inter - IC control interface .......................................................... 10 2.4 Absolute maximum ratings .............................................................. 12 3 Functionality .................................................................................. 13 3.1 Sensing element ............................................................................. 13 3.2 IC interface ...................................................................................... 13 3.3 Factory calibration ........................................................................... 13 3.4 How to interpret pressure readings ................................................. 13 4 FIFO ................................................................................................ 15 4.1 Bypass mode .................................................................................. 15 4.2 FIFO mode ...................................................................................... 16 4.3 Stream mode ................................................................................... 16 4.4 Dynamic-Stream mode ................................................................... 17 4.5 Stream-to-FIFO mode ..................................................................... 18 4.6 Bypass-to-Stream mode ................................................................. 19 4.7 Bypass-to-FIFO mode ..................................................................... 20 4.8 Retrieving data from FIFO ............................................................... 20 5 Application hints ........................................................................... 21 5.1 Soldering information ...................................................................... 22 6 Digital interfaces ........................................................................... 23 6.1 IC serial interface ............................................................................ 23 6.2 I2C serial interface .......................................................................... 23 6.3 I2C operation ................................................................................... 24 6.4 SPI bus interface ............................................................................. 25 6.5 SPI read .......................................................................................... 26 6.6 SPI write .......................................................................................... 27 6.7 SPI read in 3-wire mode .................................................................. 28 2/48 DocID029129 Rev 1