Freescale readies ultra thin MEMS sensor - Embedded.com

Freescale readies ultra thin MEMS sensor

LONDON — Freescale Semiconductor has started sampling a micro-electromechanical systems (MEMS)-based sensor with a 3-axis digital-output accelerometer that the company says is the thinnest on the market.

Volume production of the device is scheduled for the third quarter of the year.

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

It comes in a 0.8 mm thin plastic land grid array (LGA) and can communicate on both I2C and SPI interface buses. The device eliminates the need for a dedicated analog-to-digital converter and enables the sensor to share interfaces with other devices.

The MMA7450L enables an array of motion-based functions, such as tilt scrolling, gaming control, tap to mute and freefall hard disk drive 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 A/D converter and external memory,” said Demetre Kondylis, vice president 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 micro Amps, with 5 micro Amps 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.

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