KXTI9-1001 Datasheet, PDF (44/54 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
Directional Tap Detection Feature Description
The Directional Tap Detection feature of the KXTI9 recognizes single and double tap inputs and reports the
acceleration axis and direction that each tap occurred. Eight performance parameters, as well as a user-
selectable ODR are used to configure the KXTI9 for a desired tap detection response.
Performance Index
The Directional Tap^TM detection algorithm uses low and high thresholds to help determine when a tap
event has occurred. A tap event is detected when the previously described jerk summation exceeds
the low threshold (TDT_L_THRESH) for more than the tap detection low limit, but less than the tap
detection high limit as contained in TDT_TAP_TIMER. Samples that exceed the high limit
(TDT_H_THRESH) will be ignored. Figure 6 shows an example of a single tap event meeting the
performance index criteria.
Calculated Performance Index
180
PI
160
: Sampled Data
140
120
100
80
60
40
20^TDT_L_THRESH
0
3.14
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3.15 3.16 3.17 3.18 3.19
time(sec)
Figure 6. Jerk Summation vs Threshold
3.2
3.21
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