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FXOS8700CQ pulse detection

Question asked by Kurt Mirdell on Dec 11, 2017
Latest reply on Dec 12, 2017 by Tomas Vaverka

I am trying to get double-tap detection to work properly. I think the data sheet is a little unclear.

 

Is the treshold values (PULSE_THSX/Y/Z) absolute values or differential values? Depending on orientation there will be a static value between -1g and +1g. The tap comes on top of that.

 

The time steps in table 135 and 136 refers to HP_FILTER_CUTOFF[pls_hpf_en] = 0 or 1. However, the HP_FILTER_CUTOFF doesn't have a pls_hpf_en bit. It has bits pulse_hpf_byp  and pulse_lpf_en. I can't find any description what these two bits are doing. Why would you want low pass filter for pulse detection?

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