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Ultrathin MEMS-based sensor suits portable devices

Posted: 13 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:MEMS-based sensor? MEMS? microprocessors? SPI? ADC?

Freescale Semiconductor has started sampling a MEMS-based sensor with a three-axis digital-output accelerometer that the company says is the thinnest on the market.

Dubbed the MMA7450L, the accelerometer is targeted at mobile phones and portable media devices where it can simplify integration of microprocessors and MCUs.

It comes in a 0.8mm thin plastic land grid array and can communicate on both I?C and SPI interface buses. The device eliminates the need for a dedicated ADC and enables the sensor to share interfaces with other devices.

MMA7450L enables an array of motion-based functions, such as tilt scrolling, gaming control, tap to mute and freefall HDD protection.

"We have achieved a 77 percent reduction in package size and combined three axes of sensing direction with digital output, eliminating the need for an ADC and external memory," said Demetre Kondylis, VP and general manager of Freescale's sensor and actuator solutions division.

The device includes a g-select feature with three sensitivities (2g, 4g, 8g), offering designers the flexibility to select the g-force detection level a specific application needs.

As well as digital output, the part embeds features such as threshold and pulse or click-detect for fast motion detection and offset calibration. Current consumption is just 400?A, with 5?A in standby mode.

As well as starting to sample the part, Freescale has introduced an evaluation board for designers, as well as a reference board.

Volume production of the device is scheduled in Q3.

- John Walko
EE Times Europe




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