AIS2120SX datasheet(1/58 Pages) STMICROELECTRONICS

Part #	AIS2120SX

Description	Embedded self-test

PDF	58 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 58 page

This is information on a product in full production.

January 2017

DocID028312 Rev 3

1/58

AIS1120SX

AIS2120SX

MEMS automotive acceleration sensor:

single/dual-axis with SPI interface

Datasheet

- production data

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 2nd

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.

SOIC8

Table 1. Device summary

Order code

g-range

Sensitivity

axes

Operating temperature

range [

C]

Package

Packing

AIS1120SXTR

120 g

x

-40 to +105

SOIC8N

Tape and reel

AIS2120SXTR

120 g

xy

-40 to +105

SOIC8N

Tape and reel

www.st.com

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