Triple-axis accelerometers add self-test and temperature compensation

Accelerometers are becoming mainstream technology for applications that require low power consumption and advanced motion sensing within a small form factor. The MMA7361L, MMA7341L and MMA7331L triple-axis analogue accelerometers are designed to address this rapidly emerging trend.

Freescale’s MMA73xxL XYZ-axis analogue accelerometers integrate a self-test diagnostic feature. This verifies that the accelerometer is in working order at any time before or after it is implemented in design. Other special features include a 1-pole low-pass filter, temperature compensation, Zero-g-detect, for the detection of linear freefall, and g-select to allow for the selection between two sensitivities.

The Zero-g offset and sensitivity are factory set and therefore require no external devices. The devices offer a selectable 1.5g to 12g range to tackle various sensing functions, such as fall, tilt, motion, positioning, shock and vibration. The MMA73xxL accelerometers therefore enable functions such as tilt scrolling, gaming control, tap to mute and freefall protection. The MMA73xxL devices are low-power, low-profile capacitive micro-machined accelerometers, with integrated sleep mode, making them suitable for handheld or battery-powered electronics.

 

FEATURES 3mm x 5mm x 1mm Land Grid Array (LGA) package 400µA current consumption 3µA sleep mode 2.2V to 3.6V operation Customer-selectable g-range: 1.5g/6g (MMA7361L) 3g/11g (MMA7341L) 4g/12g (MMA7331L) Fast power-up response time at 1ms (0.5ms enabled response time) 800mV/g sensitivity at 1.5g

APPLICATIONS Navigation, dead-reckoning and fleet management Robotics HDD and PC freefall detection/anti-theft PDAs Mobile phones and other portable devices Pedometers

 

 

Freescale / MMA7xx1L