KXTI9-1001 Datasheet, PDF (46/54 Pages) List of Unclassifed Manufacturers – 2g/4g/8g Tri-axis Digital Accelerometer Specifications

± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
PART NUMBER:
KXTI9-1001
Rev. 2
Jul-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 8 shows a double tap event meeting the PI, latency and window requirements.
Calculated Performance Index
PI
200
TDT_WINDOW_TIMER
150
TDT_TIMER
100
TDT_LATENCY_TIMER
TDT_LATENCY_TIMER
50
TDT_L_THRESH
0
3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9
time(sec)
Figure 8. Double Directional Tap^TM Timing
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