Need to make your device drain zero power when it is not used, but still keep it responsive to any movement, tapping or vibration? Analog Devices illustrates how their new ADXL362 3-axis accelerometer can be used as a power switch. While the main system remains switched off, only the accelerometer keeps draining the battery. With 300nA current consumption the ADXL362 is able to sample all three axis @ 6Hz and in case of movement occurring raise a GPIO.
For your ultimate consumer gadget this means it could theoretically idle for almost 100 years with a single CR2032 coin cell battery and be still able to turn on immediately, when the user picks it up from the table (or throws it into the bin). For pure power switching purposes the price ($3.97@1000pcs) of the ADXL362 is a bit high, but if you need accelerometer anyway in your device it is worth looking at.
For all hobbyist out there, Analog has made a small app note how to get the $30 breakout board of the ADXL362 working with Arduino.
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