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Bosch Semiconductors

SMP144

Medium pressure sensor for transmission control

Application & Technical Summary

SMP14x

The SMP144 ensures smooth and fast shifting in automatic transmissions by determining the ideal shifting pressure point with an accuracy to a tenth of a bar.

A piezo-resistance wheatstone bridge on the SMP144 membrane transforms pressure into electrically measurable resistance. The level of the electric bridge signal changes proportionally to the bend of the membrane. Signal conditioning and processing is performed by the ASIC.

Product benefits

  • Designed to meet ASIL requirements
  • Various diagnostic information available
  • Digital or analog interface selectable
  • Temperature signal available
  • Customized pressure ranges and transfer functions
  • Short circuit and ESD protected
  • Easy integration due to small and optimized housing
  • Flexible mounting possibilities
  • Available with digital or analog interface
  • Over 30 sensor variants

100% leak-proof

for a safe lifetime operation in oil

Technical Features

Type
Medium pressure sensor
Package
Hermetically sealed 3-pin disc-shaped metal housing
Range
50 kPa to 4 MPa
Interface
digital (analog)
Resolution
12 bit
Tolerance
1.2 to 1.8% FS
Supply voltage
5 V
Supply current
< 12.5 mA
Operating temperature
-40°C to 150°C

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