Integrated pressure sensor for safety IC

October 17, 2013 // By Christoph Hammerschmidt
Elmos has integrated a pressure sensor into its new safety IC E524.40. The device is designed for sensing functions in applications such as side airbags and pedestrian protection systems.

The sensor detects sudden changes in pressure independent of the average ambient air pressure. Both relative and average air pressure are constantly analysed by the IC. The IC complies with the specifications according to AK-LV29 (VDA) and has been designed in accordance with Functional Safety standard ISO 26262.

The pressure sensor and the signal readout circuit identify a dynamic pressure change associated with an accident and communicate it to the PSI5 interface. The diagnostic data from sensor and IC are also transmitted in order to monitor system status, thus complying with functional safety requirements. Extensive self test routines are implemented for diagnostic functionality at system start and in operation. Self test capability comprises both the sensor and the IC (analogue part, DSP, ROM, and EEPROM).

The integrated EEPROM stores calibration data, device ID, and other programmable data. The system comes in a modified SOIC20 package.

For assembly of the PSI5 network, Elmos offers its E981.07 and E981.08 interface components  (dual and quad channel, respectively), comprising a complete system of synchronised modules.