Europe’s leading semiconductor manufacturer, STMicroelectronics
has released the AIS2DW12 automotive accelerometer which makes
Passive Keyless Entry (PKE) radio fobs tough enough to survive the inevitable
drops and scrapes in a lifetime of use. Also featuring ultra-low power
consumption, the accelerometer adds practicality to the convenience and
superior theft resistance that comes with motion awareness.
The AIS2DW12 is AEC-Q100 certified and compliant with
automotive Product Part Approval Process (PPAP) Level-3. It is available now in
a 2mm x 2mm x 1mm 12-pad Land-Grid Array (LGA) package from $1.375 for orders
of 1000 pieces.
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 – it could be
placed on a table in the owner’s house - to send an unlock command by relaying
the request via an intermediate transmitter, and hence gain access and steal
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.
Unlike some other accelerometers positioned for PKE, ST’s
AIS2DW12 passes severe industry shock testing. Hence vehicle owners can enjoy
greater security without taking extra care of a fragile fob, and with longer
battery life as a bonus. Leveraging the dedicated internal engine for efficient
movement and orientation detection, the operating current of just 380nA at
1.6Hz is at least twice as good as alternative devices, further enhancing
battery-energy savings. The AIS2DW12 operates from 1.8V DC and can be powered
from a single lithium cell, producing a digital output with full-scale range up
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