Product Brief
Freescale samples advanced airbag sensors
Ismini Scouras11/3/2011 3:20 PM EDT
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Freescale Semiconductor has started to sample a family of
automotive acceleration sensors designed to expedite development of advanced
airbag systems that help save lives and protect against injuries caused by
vehicle collisions. Freescale's new Xtrinsic MMA65xxKW family of accelerometers employs intelligent sensing technologies designed for front and side crash detection that can be easily and efficiently integrated into vehicle airbag systems. The MMA65xxKW family is based on high-aspect-ratio micro-electromechanical systems (HARMEMS) technology, and features a streamlined in-vehicle communication system. It offers high resolution (precision) and a wide dynamic range.
Freescale's MMA65xxKW accelerometers are the safing sensors located in the vehicle's main electronic control unit (ECU), if the airbag system uses satellite sensors. Satellite inertial sensors (Freescale's MMA5xxxKW) are positioned around the perimeter of the car to detect front and side impacts. Working together, these sensors assist the vehicle in determining the optimal deployment of the airbags.
The MMA65xxKW sensors work at 105 g-range and a 12-bit data output with 18.2 LSB/g, enabling improved sensor resolution with no programming necessary by the manufacturer and wider dynamic range measurement capabilities required for smaller vehicles. Compatible with a standard serial peripheral interface (SPI) protocol, the sensors can be easily incorporated into an airbag system. They feature an arming pin function that reduces the risk of data corruption in the main crash sensor or safing sensor of the airbag system. The MMA65xxKW family incorporates either a single- or dual-axis over-damped lateral inertial sensor housed in a quad flat no-lead (QFN) package, which is designed for a smaller footprint and more flexibility for module orientation in vehicles.
Key highlights:
- MMA655xKW X-axis devices at ±105g or ±120g full-scale range, independently specified for each axis
- MMA65xxKW XY-axis devices at ±80g, ±105g or ±120g full-scale range, independently specified for each axis
- 3.3V or 5V single supply operation
- SPI-compatible serial interface
- 12-bit digital signed or unsigned SPI data output
- Independent programmable arming functions for each axis
- 12 low-pass filter options, ranging from 50Hz to 1000Hz
- Optional offset cancellation with > 6s averaging period & < 0.25 LSB/s slew rate
- Pb-Free 16-Pin QFN-6x6 Package
Pricing: Starts at $3.69 for the MMA6519KW, MMA6525KW, and MMA6527KW, and $2.99 for the MMA6555KW and MMA6556KW in 10,000-piece quantities.
Availability: Sampling now; production planned for Q2 2012.
For more information, visit this page.
This article originally appeared on EDN.
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