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MMA8451Q Double Pulse Abort and Tap detect

Question asked by Joel Shaw on Aug 3, 2018
Latest reply on Aug 14, 2018 by Tomas Vaverka

When using the tap detect, the application note AN4072 in Figure 2 describes a pulse consisting of a positive pulse followed by a negative pulse.  Does this result in two taps?  If Double Pulse Abort (DPA) is set, will a full-scale positive followed by a full-scale negative result in an abort condition?  Should I turn off the DPA instead? 

I’m having a hard time determining why I have inconsistent results in my data.

I’ve attached a screen shot that shows an interrupt on the first double-tap, but not after that.  I’ve looked at the data in detail, and feel that the following double-taps should fit the qualifications, but I’m wondering if the DPA is preventing the double-tap from working correctly.

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