AT2640 High Accuracy Low Power Barometer Module

General Description

The Atmodule AT2640-16A precision digital-output pressure sensor uses smart sensor techniques to correct pressure readings for temperature and linearity, achieving a total error band of under 0.1% FS (0.016 PSI) over the -58 F to +185 F temperature range. The typical error band is 0.05% FS (0.008 PSI) over the -58 F to +185 F temperature range. Static accuracy is better than 0.002 PSI. The module contains an aerospace-grade silicon pressure sensor, sensor interface electronics, a 21-bit A/D converter, EEPROM calibration memory, and a sensor signal processor. Operating from a 3.3 volt supply, the module is designed for board mounting with 8-pin micro header connection. The module is media isolated and compatible with air and oils. The wetted materials are stainless steel and silicon. A parylene conformal coating protects the electronic circuitry.


  • Low power device 3.3 volt operation at 2.0 mA
  • Media isolation
  • 0.10% FS total error over temperature all effects
  • Very low long term drift
  • Four-wire serial interface. Three-wire user interface
  • Pressure measurement range 0 to 16.6 PSIA
  • Digital temperature compensation and calibration
  • Parylene conformal coating protects circuitry
  • 80 mS conversion time
  • 1.0 mS data access time
  • 0.013% (0.002 PSI) static accuracy


  • Barometers and altimeters
  • Secondary air data computers
  • Smart radios and GPS receivers
  • Pressure transmitters


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The Atmos AT2640


A pair of AT2640 Atmodules next
to their big brother, the AT2610


Atmos Aerospace LLC • Pescadero, California • tel 650.879.1674 • fax 650.879.1675 • EMAIL