MC3410 Datasheet, PDF (35/75 Pages) NXP Semiconductors – 10-Bit high-speed multiplying D/A converter

MC3410 3-Axis Accelerometer
Datasheet
9.6 TAP DETECTION
On-chip tap detection hardware allows the device to detect user events such as on-screen
button presses. Tap detection can be enabled or disabled on each axis via the TAPEN: Tap
Detection Enable Register.
To detect fast, impulse events like a tap, the TAPP: Tap Pulse Register should be written with
a tap pulse parameter that sets the maximum number of sample periods that a TAPD event
may exceed the threshold before it is ignored by the detection logic. Sensed values that are
above the threshold for long periods of time typically do not correspond to tap events.
For example, setting the pulse value to 5 requires that the tap impulse exceed the threshold for
at least 1 sample period and up to 5 sample periods. The tap detection hardware is rearmed
after the sensed value is below the threshold. See the example in Figure 16 and Figure 17.
Tap detect is reset here
Sensed Value
(6^th sample)
Sample
TAP_TH
Register
Tap detect is
rearmed here
0 snap
Time
Tap Pulse Register == 5 but the sensed value is above the
threshold for 10 samples. No tap is detected.
Figure 16. Example Use of Tap Detection Hardware – No Tap Detected
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APS-048-0010v2.2
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