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ADXL345 Activity Sensitivity

Question asked by pvmellor on Apr 18, 2013
Latest reply on Apr 19, 2013 by neilzhao

I want to sleep my ADXL345, and wake it when it detects a spike in acceleration. The spike is around 10g, but only lasts for about 0.05 seconds. I'm unsure if the part will detect this spike in sleep mode. The datasheet says it samples at a higher rate and decimates this, but it does not mention what the higher rate is. Anyone know if such a spike in acceleration will be detected by this device, sufficient to reliably wake it from sleep mode? Or is it likely to simply be missed if its only sampling at 1Hz wakeup frequency say?