BMA253
Data sheet
Page 32
The parameters (0x2A) tap_shock and (0x2A) tap_quiet apply to both single tap and double tap
detection, while (0x2A) tap_dur applies to double tap detection only. Within the duration of
(0x2A) tap_shock any slope exceeding (0x2B) tap_th after the first event is ignored. Contrary to
this, within the duration of (0x2A) tap_quiet no slope exceeding (0x2B) tap_th must occur,
otherwise the first event will be cancelled.
4.7.6.1 Single tap detection
A single tap is detected and the single tap interrupt is generated after the combined durations of
(0x2A) tap_shock and (0x2A) tap_quiet, if the corresponding slope conditions are fulfilled. The
interrupt is cleared after a delay of 12.5 ms.
Do not map single-tap to any INT pin if you do not want to use it.
4.7.6.2 Double tap detection
A double tap interrupt is generated if an event fulfilling the conditions for a single tap occurs
within the set duration in (0x2A) tap_dur after the completion of the first tap event. The interrupt
is automatically cleared after a delay of 12.5 ms.
4.7.6.3 Selecting the timing of tap detection
For each of parameters (0x2A) tap_shock and (0x2A) tap_quiet two values are selectable. By
writing ´0´ (´1´) to bit (0x2A) tap_shock the duration of (0x2A) tap_shock is set to 50 ms (75
ms). By writing ´0´ (´1´) to bit (0x2A) tap_quiet the duration of (0x2A) tap_quiet is set to 30 ms
(20 ms).
The length of (0x2A) tap_dur can be selected by setting the (0x2A) tap_dur bits according to
Table 11
Table 11: Selection of tap_dur
(0x2A)
tap_dur
length of tap_dur
000b
001b
010b
011b
100b
101b
110b
111b
50 ms
100 ms
150 ms
200 ms
250 ms
375 ms
500 ms
700 ms
BST-BMA253-DS000-01 | Revision 1.0 | August 2015
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