The STMicroelectronics, a global semiconductor
leader, has recently launched, AIS2DW12,
automotive accelerometer, 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.
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
The new product is enhanced with an accelerometer and
fobs may 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.
The new product passes severe industry shock testing,
adding greater security without taking extra care of a fragile fob, and with
longer battery life as a bonus.
The dedicated internal engine is used 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 accelometer operates from 1.8V DC and can be
powered from a single lithium cell, producing a digital output with full-scale
range up to 4g.
The new product 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.