LPS331AP MEMS pressure sensor: 260-1260 mbar absolute digital output barometer Datasheet production data Features 260 to 1260 mbar absolute pressure range High-resolution mode: 0.020 mbar RMS Low power consumption: Low resolution mode: 5.5 A High resolution mode: 30 A High overpressure capability: 20x full scale HCLGA-16L (3 x 3 x 1 mm) Embedded temperature compensation Embedded 24-bit ADC The sensing element consists of a suspended Selectable ODR from 1 Hz to 25 Hz membrane realized inside a single mono-silicon 2 SPI and I C interfaces substrate. It is capable to detecting pressure and Supply voltage: 1.71 to 3.6 V is manufactured using a dedicated process developed by ST, called VENSENS. High shock survivability: 10,000 g The VENSENS process allows to build a mono- Small and thin package silicon membrane above an air cavity with ECOPACK lead-free compliant controlled gap and defined pressure. The membrane is very small compared to the Applications traditionally built silicon micromachined membranes. Membrane breakage is prevented by Indoor and outdoor navigation an intrinsic mechanical stopper. Enhanced GPS for dead-reckoning The IC interface is manufactured using a standard Altimeter and barometer for portable devices CMOS process that allows a high level of integration to design a dedicated circuit which is Weather station equipment trimmed to better match the sensing element Sport watches characteristics. The LPS331AP is available in a small holed cap Description land grid array (HCLGA) package and it is The LPS331AP is an ultra compact absolute guaranteed to operate over a temperature range piezoresistive pressure sensor. It includes a extending from -40 C to +85 C. The package is monolithic sensing element and an IC interface holed to allow external pressure to reach the able to take the information from the sensing sensing element. element and to provide a digital signal to the external world. Table 1. Device summary Order codes Temperature range C Package Packing LPS331APY Tray -40 to +85 HCLGA-16L LPS331APTR Tape and reel March 2012 Doc ID 022112 Rev 7 1/36 This is information on a product in full production. www.st.com 36Contents LPS331AP Contents 1 Block diagram and pin description . 3 1.1 LPS331AP block diagram 3 1.2 Pin description 3 2 Mechanical and electrical specifications 5 2.1 Mechanical characteristics . 5 2.2 Electrical characteristics . 6 2.3 Absolute maximum ratings . 7 3 Functionality . 8 3.1 Sensing element . 8 3.2 IC interface . 8 3.3 Factory calibration . 8 4 Application hints 9 4.1 Soldering information . 9 5 Digital interfaces . 10 5.1 I2C serial interface 10 5.2 I2C serial interface 10 5.2.1 I2C operation . 11 5.3 SPI bus interface . 12 5.3.1 SPI read . 13 5.3.2 SPI write 14 5.3.3 SPI read in 3-wires mode . 15 6 Register mapping 16 7 Register description 17 8 Package mechanical section . 32 9 Revision history . 35 2/36 Doc ID 022112 Rev 7