Water-resistant pressure sensor targets budget-constrained applications - Embedded.com

Water-resistant pressure sensor targets budget-constrained applications

STMicroelectronics’ LPS33W water-resistant MEMS pressure sensor offers stability and accuracy for a range of budget-constrained applications, including fitness trackers, wearables, weather station equipment, and general-purpose industrial sensing. Protected by a potting gel inside its cylindrical metal package, the sensor withstands salt water, chlorine, bromine, detergent, and light industrial chemicals.

The piezoresistive pressure sensor functions as a digital output barometer, comprising a sensing element and signal-conditioning ASIC that communicates via an I 2 C or SPI interface. It has an absolute pressure range of 260 hPa to 1260 hPa and pressure noise of just 0.008 hPa RMS. Temperature compensation keeps accuracy to within ±3 hPa over an operating temperature range of 0°C to +65°C.

The LPS33W consumes 15 µA in high-performance mode, 3 µA in low-power mode, and 1 µA power-down to help maximize the runtime of battery-powered devices. A 128-bit embedded FIFO memory stores up to 40 slots of 32-bit pressure and temperature data. The LPS33W operates over a temperature range of -40°C to +85°C and requires a supply voltage of 1.7 V to 3.6 V.

Prices for the LPS33W pressure sensor housed in a 3.3×2.9 mm cylindrical metal case with a corrosion-resistant lid start at $3.60 each in lots of 1000 units.

LPS33W product page

STMicroelectronics, www.st.com

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>> This article was originally published on our sister site, EDN: “Economical pressure sensor is water-resistant.”

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