MC3630 Datasheet, PDF (56/83 Pages) –

MC3630 3-Axis Accelerometer
Preliminary Datasheet
6
SNIFF_AND_OR Sets the logical mode for combining of X/Y/Z SNIFF wakeup
events before an interrupt is generated. To remove one of
the channels (axis) from the equation, use the
corresponding axis PD bit in register 0x10 bits [6:4].
0: OR - SNIFF wakeup/interrupt is triggered when any of the
active channels have met detection threshold and count
requirements (default).
Sniff Wakeup = Δ(abs(X) – X Sniff Threshold) or
Δ(abs(Y) – Y Sniff Threshold) or
Δ(abs(Z) – Z Sniff Threshold)
1: AND - SNIFF wakeup/interrupt is triggered when all active
channels have met detection threshold and count
requirements.
Sniff Wakeup = Δ(abs(X) – X Sniff Threshold) and
Δ(abs(Y) – Y Sniff Threshold) and
Δ(abs(Z) – Z Sniff Threshold)
7
SNIFF_MODE This bit determines how the SNIFF block computes its delta
count.
0: C2P Mode (Current to Previous): The delta count
between current and previous samples is a moving window.
The SNIFF logic uses the current sample and the immediate
previous sample to compute a delta (default).
1: C2B Mode (Current to Baseline): The delta count is
generated from subtracting the current sample from the first
sample stored when entering SNIFF mode.
Table 25. Sniff Threshold Control Register Settings
mCube Proprietary
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APS-048-0047v1.2
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