KXTI9-1001 Datasheet, PDF (51/54 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
In trigger mode, data is accumulated in the buffer sequentially until the Sample Threshold is
reached. Once the Sample Threshold is reached, the oldest samples are discarded when new
samples are collected. Note in Figure 13 how Data0 was thrown out to make room for Data8.
Trigger write pointer →
Index
0
1
2
3
4
5
6
7
8
9
Sample
Data1
Data2
Data3
Data4
Data5
Data6
Data7
Data8
← Trigger read pointer
← Sample Threshold
Figure 13. Additional Data Prior to Trigger Event
After a trigger event occurs, the buffer no longer discards the oldest samples, and instead
begins accumulating samples sequentially until full. The buffer then stops collecting samples,
as seen in Figure 14. This results in the buffer holding SMP_TH[6:0] samples prior to the
trigger event, and SMPX samples after the trigger event.
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Index
0
1
2
3
4
5
6
7
8
9
Sample
Data1
Data2
Data3
Data4
Data5
Data6
Data7
Data8
Data9
Data10
← Trigger read pointer
← Sample Threshold
Figure 14. Additional Data After Trigger Event
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