STMicroelectronics AIS2DW12 automotive accelerometer

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The STMicroelectronics AIS2DW12 automotive accelerometer makes passive keyless entry (PKE) radio fobs tough enough to survive drops and scrapes. Also featuring ultralow power consumption, the accelerometer adds practicality to the convenience and theft resistance that comes with motion awareness.

Ordinary PKE radio fobs listen continuously for an ‘unlock’ request coming from the vehicle when it is touched. They then send a command to unlock the vehicle. Thieves can force a fob that is out of range to send an unlock command by relaying the request via an intermediate transmitter, and hence gain access and steal the vehicle.

Enhanced with an accelerometer, fobs can ignore malicious relayed transmissions by powering down the receiver when not moving and out of range. The radio wakes only when movement is detected at close range as the owner approaches the vehicle. In addition, deactivating the receiver during idle periods helps extend battery life.

ST’s AIS2DW12 passes severe industry shock testing, so vehicle owners can enjoy security without taking extra care of a fragile fob. Leveraging the dedicated internal engine for efficient movement and orientation detection, it has an operating current of 380 nA at 1.6 Hz, enhancing battery-energy savings.

The product operates from 1.8 VDC and can be powered from a single lithium cell, producing a digital output with full-scale range up to 4g. It is AEC-Q100 certified and compliant with automotive Product Part Approval Process (PPAP) Level-3. It is available in a 2 x 2 x 1 mm 12-pad land-grid array (LGA) package.

For more information: www.st.com/ais2dw12-pr.