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