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PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTF9-4100
Rev. 6
Jun-2011
Double Tap Detection
An event can be characterized as a double tap only if the second tap crosses the performance index
(TDT_L_THRESH) outside the TDT_TIMER. This means that the TDT_TIMER determines the
minimum time separation that must exist between the two taps of a double tap event. Similar to the
single tap, the second tap event must exceed the performance index for the time limit contained in
TDT_TAP_TIMER. The double tap will be reported at the end of the second TDT_LATENCY_TIMER.
Figure 7 shows a double tap event meeting the PI, latency and window requirements.
Calculated Performance Index
PI
200
150
TDT_WINDOW_TIMER
TDT_TIMER
100
TDT_LATENCY_TIMER
50
TDT_L_THRESH
0
TDT_LATENCY_TIMER
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
time(sec)
Figure 7. Double Directional Tap TM Timing
36 Thornwood Dr. – Ithaca, NY 14850
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