Digital absolute pressure sensor MS5805 by AMSYS

Digital absolute pressure sensor MS5805

The MS5805-02BA is a new generation of high-resolution altimeter sensors from MEAS Switzerland with I²C bus interface. It is optimized for altimeters and variometers with an altitude resolution of 20 cm. The sensor module includes a high-linearity pressure sensor and an ultra low power 24 bit ΔΣ ADC with internal factory-calibrated coefficients. It provides a precise digital 24 Bit pressure and temperature value and different operation modes that allow the user to optimize for conversion speed and current consumption. A high-resolution temperature output allows the implementation of an altimeter/thermometer function without any additional sensor.

The MS5805-02BA can be interfaced to virtually any microcontroller. The communication protocol is simple, without the need of programming internal registers in the device. This new sensor module generation is based on leading MEMS technology and latest benefits from MEAS Switzerland proven experience and know-how in high volume manufacturing of altimeter modules, which have been widely used for over a decade. The sensing principle employed leads to very low hysteresis and high stability of both pressure and temperature signal.

*Modules are pressure sensors, whose output signals have to be calculated by an external microprocessor.

Accessories for the MS5805

Also available are sample boards, which can be used together with the USB Development Kit to quickly evaluate the sensors and build prototypes.


  • Pressure range: 10 to 2000 mbar
  • Temperature range: -40°C – 85°C
  • Resolution pressure: 0.02 mbar
  • Resolution temperature: <0.01 °C
  • Supply voltage: 1.8 – 3.6 V
  • Very low current consumption: Standby max. 0.1 μA
  • I²C / SPI interface
  • Fast conversion under 0.5 ms (adjustable)
  • Excellent long-term stability
  • Media resistant
  • ESD protected
  • Small size: 4.5 × 4.5 mm2
  • Reflow capability
  • RoHS and REACH compliant


  • Mobile altimeters and mobile barometric measuring systems
  • People search and navigation devices
  • Weather stations
  • Sports watches
  • GPS receiver
  • Air traffic control (Variometer and datalogger)

For information on prices and delivery times or if you have any technical questions, please contact