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AIS2DW12 Datasheet

ultra-low-power 3-axis accelerometer

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AIS2DW12
MEMS digital output motion sensor:
ultra-low-power 3-axis accelerometer for automotive applications
Datasheet - production data
Description
LGA-12 (2x2x0.93 mm³)
Features
AEC-Q100 qualified
Supply voltage, 1.62 V to 3.6 V
Independent IO supply and supply voltage
compatible
Ultra-low-power mode consumption down to
380 nA @1.6 Hz
±2g/±4g dynamically selectable full scales
High-speed I²C/SPI digital output interface
2 independent programmable interrupts
Single data conversion on demand
16-bit data output
Embedded temperature sensor
Self-test
32-level embedded FIFO
10000 g high shock survivability
ECOPACK, RoHS and “Green” compliant
Applications
Car key applications
Inclination / orientation detection
Motion-activated functions
Gesture recognition
Free-fall detection
Smart power saving
The AIS2DW12 is an ultra-low-power three-axis
linear accelerometer which leverages on the
robust and mature manufacturing processes
already used for the production of micromachined
accelerometers and designed to address non-
safety automotive applications.
The AIS2DW12 has four different ultra-low-power
modes, two user-selectable full scales (2g/4g)
and is capable of measuring accelerations with
output data rates from 1.6 Hz to 100 Hz.
The AIS2DW12 has an integrated 32-level first-in,
first-out (FIFO) buffer allowing the user to store
data in order to limit intervention by the host
processor.
The embedded self-test capability allows the user
to check the functioning of the sensor in the final
application.
The AIS2DW12 has a dedicated internal engine
to process motion and acceleration detection
including free-fall, motion and no-motion, wakeup,
activity/inactivity and 6D/4D orientation.
The AIS2DW12 is available in a small thin plastic
land grid array package (LGA) and it is
guaranteed to operate over an extended
temperature range from -40 °C to +85 °C.
Table 1. Device summary
Order codes
Temp. range
[°C]
Package
Packaging
AIS2DW12 -40 to +85 LGA-12
Tray
AIS2DW12TR -40 to +85
LGA-12
Tape and
reel
June 2019
This is information on a product in full production.
DocID031240 Rev 4
1/60
www.st.com


STMicroelectronics Electronic Components Datasheet

AIS2DW12 Datasheet

ultra-low-power 3-axis accelerometer

No Preview Available !

Contents
Contents
AIS2DW12
1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2 Mechanical and electrical specifications . . . . . . . . . . . . . . . . . . . . . . . 11
2.1 Mechanical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.3 Temperature sensor characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.4 Communication interface characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.4.1 SPI - serial peripheral interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.4.2 I²C - inter-IC control interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.5 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3 Terminology and functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1.1 Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1.2 Zero-g level offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2.2 Single data conversion on-demand mode . . . . . . . . . . . . . . . . . . . . . . . 19
3.2.3 Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.2.4 Activity/Inactivity, stationary/motion detection functions . . . . . . . . . . . . . 20
3.2.5 Offset management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.3 Sensing element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.4 IC interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.5 Factory calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.6 Temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5 Digital main blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.1 Block diagram of filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.2 FIFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2/60 DocID031240 Rev 4


Part Number AIS2DW12
Description ultra-low-power 3-axis accelerometer
Maker STMicroelectronics
Total Page 30 Pages
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