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ADXL345 Activity Interrupt vs. FIFO data

Question asked by chriss-chd on May 26, 2014
Latest reply on Jun 18, 2014 by neilzhao


I’m using the ADXL with the activity Interrupt and FIFO trigger mode. I’ve make follow interesting notice.

Sometimes I got a activity Interrupt but all values in the FIFO are under the threshold level. How can this happened?

For example. Threshold level = 20 (1.25g), got activity interrupt and read out the FIFO, now the maximum is 17 (1.0625g)


Can this happened because the threshold will analyse before filtering and the FIFO data are filtered? (I’ve set the filter to 12.5Hz)


Thanks for input and help!