MMA8652FC motion detection interrupt with HPF enabled

[carlodipasquale]

Good morning

I have many interrupts, as if  HPF filter is bypassed (see log file annexed)

If I see acceleration data, they are filtered correctly (see Z axis).

What's wrong with my settings?

Carlo Di Pasquale

Original Attachment has been moved to: Motion_test.txt.zip

[TomasVaverka · Accepted solution]

Hi Carlo,

The motion detection function is an analysis of low-pass filtered data only, even if the high-pass filter is enabled (HPF_OUT = 1). I would recommend using the transient detection function instead as it analyzes high-pass filtered data unless the HPF_BYP bit is set. For more information on the transient detection function including example register setting please refer to the AN4071.

I hope it helps.

Regards,

Tomas

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