SMP475 | Pressure sensor for side and front impact sensing

SMP475 is an integrated pressure sensor module, designed for use in automotive airbag applications. SMP475 can be mounted in a sensor-satellite housing with a pressure inlet, typically placed in the car’s side doors (side airbag application) or in the front bumper (pedestrian protection). SMP475 detects rapid pressure changes that occur in cavities e.g. in passenger side doors during a side impact or in designated deformation volumes (e.g. silicon tube) in pedestrian protection applications.

The module provides a normalized signal that is proportional to the pressure change, independent of ambient pressure and temperature. It also provides signals that are proportional to the slowly varying ambient pressure and temperature measured in the module. The signals are transmitted digitally via a PSI5 interface to the airbag control unit.