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MS5803-01BA Miniature Variometer Module
Pressure Medium: Air/Gas
Sensor Type: Absolute, Barometric
Supply Voltage: Under 5V
Output Signal: Digital
Pressure Range: 3-300 psi, 300 psi & up
Kind: Board Level

The MS5803 is a new generation of high resolution altimeter sensors with SPI & I2C interface. There are various models up to 30 bar. The sensor module includes a high linearity pressure sensor with an ultra low power 24 bit ADC with internal factory calibrated coefficients.

It provides a precise digital 24 bit pressure and temperature values 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 an additional sensor. Gel protection and an anti-magnetic stainless steel cap allows the use in 100m waterproof altimeter/compass watches.


  • Pressure ranges from 10 to 1300 mbar up to 30 bar depending on the model
  • High resolution of 10 cm (-01ba model)
  • 20 cm resolution (-02ba model)
  • Fast conversion down to 1 ms
  • Supply voltage 1.8 to 3.6V
  • Integrated temperature sensor
  • Temperature range -40°C to 85°C
  • I2C or SPI interface up to 20 MHz
  • No external components (internal oscillator)
  • RoHS-compatible & Pb-free
  • Low power, 1 µA
  • Hermetically sealable for outdoor devices

Typical Uses

  • Mobile altimeter/barometer systems
  • Bike computers
  • Adventure or multi-mode watches
  • Variometers
  • Dataloggers