Accelerometer designed for emergency call activation
The unit has a digital output and can be used to trigger an automated cellular call to emergency services giving the location and severity of the collision as part of mandated emergency call procedures.
The AIS3624DQ has a selectable full-scale range of 6g, 12g or 24g and 16-bit data output. It is housed in a QFN24L package that measures 4mm by 4mm by 1.8 mm and is currently available as engineering samples. Volume production is scheduled in 4Q14 with an anticipated price of $4.54 in 1,000-unit quantities.
Examples of emergency call systems that are becoming mandatory for new vehicles include Onstar in the United States, eCall in the European Union and ERA Glonass in Russia.
The major parameters in estimating the severity of a collision include the decelerations that occurred in all three dimensions at the moment of impact. The ERA Glonass specification for the Russian market requires that longitudinal accelerations up to +/-24g must be measurable with sufficient accuracy. The AIS3624DQ makes use of a stacked-chip architecture with the MEMS element manufactured on 200mm diameter wafers.
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