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Features

? 5 V to 16 V single supply operation

? 10-bit data output

? Embedded voltage regulator

? Embedded self-test

? Asynchronous 2 wire connectivity

? PSI5-A10P v1.3 compliant

? Error detection: single bit even parity

? Automotive AEC-Q100 qualified

? ECOPACK? compliant

? Extended temperature range: -40 °C to

+125 °C

Description

The AIS1200PS is a peripheral acceleration

sensor with a single-axis sensing element and an

IC interface able to provide acceleration

information to a master control unit through a

Manchester-coded protocol (125 kbps).

The sensing element, capable of detecting the

acceleration, is manufactured using a dedicated

process developed by ST to produce inertial

sensors and actuators in silicon.

The IC interface is manufactured using a BCD

process that allows a high level of integration. The

device is factory trimmed to better tune the

sensing element characteristics with the

acceleration information to be supplied.

The AIS1200PS has a full scale of ?200 g. The

acquisition chain is made up of a C/V converter, a

full-differential charge amplifier, a 2nd order LPF

with a cutoff frequency of 175 Hz, and a second

charge amplifier to adapt the dynamic range to an

SAR A/D converter.

The differential capacitance of the sensor is

proportional to the proof mass displacement;

thus, by sensing the differential capacitance, the

position of the sensor is determined. Then, since

the mass position is known and the position is

related to the input acceleration, the input

acceleration can be easily deduced.

The device is available in a plastic SOIC package

with 150 mils reverse frame forming for EMC

enhancement and is specified over a temperature

range extending from -40 °C to +125 °C.

Applications

? Airbag systems

? Vibration, impact monitoring