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Analog Devices has developed the ADXL345 motion sensing device for energy-constrained portable consumer products.

The ADXL345 three-axis digital iMEMS (integrated micro-electro-mechanical system) accelerometer achieves an 80 per cent power saving compared with competing three-axis inertial sensors.

The ADXL345 also incorporates an on-chip ADC (analogue-to-digital converter) that simplifies hardware configurations in wireless handsets, personal navigation devices and other mobile applications.

The ADXL345 motion sensor incorporates an on-chip FIFO (first-in/first-out) memory block that stores up to 32 sample sets of X, Y and Z data.

By sampling input data to determine if the system should be actively responding to a change in movement or acceleration, the new motion sensing devices save additional system power by off-loading that function from the host processor.

Typically a host processor consumes a dominant amount of system power budget; allowing it to remain in sleep mode as long as possible can decrease power usage by more than 75 per cent.

The ADXL345 ultra-low-power digital accelerometer has an output data range that scales from 0.1 Hz to 3.2 kHz, unlike competing devices, which have fixed 100-Hz, 400-Hz or 1-kHz data rates.

This allows portable-systems designers to better manage energy consumption by precisely allocating power for a given system function and reserving unused power for other uses.

The ADXL345 also measures dynamic acceleration resulting from motion or shock.

Its 10,000g shock rating means it is well suited for applications such as hard-disk drive protection in personal computers.

It features resolution of 4-milli-g/LSB (least-significant bit) across all g ranges, single tap and double tap detection, activity and inactivity detection, free fall detection and user-programmable threshold levels.

It also includes IC and three- and four-wire SPI (serial peripheral interface) digital interfaces and a voltage range of 1.8 to 3.6V.

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