PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTF9-4100
Rev. 6
Jun-2011
Single Tap Detection
The latency timer (TDT_LATENCY_TIMER) sets the time period that a tap event will only be
characterized as a single tap. A second tap has to occur outside of the latency timer. If a second tap
occurs inside the latency time, it will be ignored as it occurred too quickly. The single tap will be
reported at the end of the TDT_WINDOW_TIMER. Figure 6 shows a single tap event meeting the PI,
latency and window requirements.
Calculated Performance Index
160
PI
140
TDT_WINDOW_TIMER
120
100
TDT_LATENCY_TIMER
80
60
40
TDT_L_THRESH
20
0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3
3.1
time(sec)
Figure 6. Single Directional Tap TM Timing
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