SM5840 Absolut pressure sensor by AMSYS

absolute pressure sensor MS5840

The MS5840-02BA is a digital OEM sensor* that measures high-resolution absolute pressure. The sensor is matched and outputs the measured values as digital output signals via an I2C interface.

The reflow-capable sensor is designed for the pressure range of 10 – 2,000 mbar and is media-protected with a gel coating. In addition to the pressure, the pressure sensor measures the temperature from -20 to 85 °C.

The pressure sensor MS5840-02BA consists of a piezoresistive pressure measuring cell and an amplifier A/D interface IC, which are built on a ceramic substrate (3.3 x 3.3 x 1.7 mm³). The metal attachment protects the electronic components, facilitates O-ring assembly and makes the sensor water-resistant. The sensor converts the measured pressure- and temperature-dependent signal of the measuring cell into a 16bit data code. In addition, 6 individual coefficients are stored in the sensor, which allow the highly accurate software correction for pressure and temperature measurement by an external microprocessor. The I²C interface is used for serial communication with the microprocessor.

The sensor is designed for applications with a digital system environment. Since a processor already exists here at the system level, it can be used for the simple calculation of the current pressure and temperature values.


  • Pressure range: 10 – 2’000 mbar absolute
  • Temperature range: -20 .. + 85 °C
  • Resolution pressure: 0.016 mbar
  • Resolution Temperature: 0.002 °C
  • Supply voltage 1.5 – 3.6 V
  • Low power consumption: 0.6 μA (standby <0.1 μA)
  • I2C interface
  • Ceramic substrate with metal cap: 3.3 x 3.3 x 1.7 mm
  • RoHS and REACH compatible


  • Mobile water depth measurement
  • Diving computer
  • Sports watches
  • Pneumatics
  • Compressor control

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