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ADXL372 looped mode


I have a question for looped mode.

In data sheet, It is specified that "To use either linked or looped mode, both ACT_x_EN and INACT_x_EN must be set to 1; otherwise, the default mode is used."

The meaning of ACT_x_EN  is ambiguous to me.

I use only Z axis for detecting inactivity, activity.

Then is it enough to set ACT_Z_EN and  INACT_Z_EN ?

Or do I need to set  ACT_X_EN and  INACT_X_EN too?