AIS1120SX Datasheet, PDF (1/58 Pages) STMicroelectronics – Embedded self-test

AIS1120SX
AIS2120SX
MEMS automotive acceleration sensor:
single/dual-axis with SPI interface
Datasheet - production data
SOIC8
Features
 AEC-Q100 qualified
 3.3 V single supply operation
 14-bit data output
 120 g full scale
 Slow and fast offset cancellation
 Embedded self-test
 Selectable low-pass filter
 SPI interface
 ECOPACK^® compliant
 Extended temperature range -40 °C to +105 °C
Applications
 Airbag systems
 Vibrations, impact monitoring
Description
The AIS1120SX / AIS2120SX is a central
acceleration sensor with a single or dual axis
sensing element and an IC interface able to
provide acceleration information to a master
control unit via an SPI protocol.
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
characteristics of the sensing element with the
acceleration information to be supplied.
The AIS1120SX / AIS2120SX has a full scale of
120 g. The acquisition chain consists of a C/V
converter, a full-differential charge amplifier, a 2^nd
order analog-to-digital converter and a digital
core, which includes filtering, compensation and
interpolation, control logic and SPI protocol
generation.
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 SOIC8
package and is guaranteed to operate over a
temperature range extending from -40 °C to
+105 °C.
Order code
AIS1120SXTR
AIS2120SXTR
g-range
120 g
120 g
Table 1. Device summary
Sensitivity Operating temperature
axes
range [C]
x
-40 to +105
xy
-40 to +105
Package
SOIC8N
SOIC8N
Packing
Tape and reel
Tape and reel
January 2017
This is information on a product in full production.
DocID028312 Rev 3
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