BMA253
Data sheet
Page 77
Register 0x27 (INT_5)
Contains the definition of the number of samples to be evaluated for the slope interrupt (any-
motion detection) and the slow/no-motion interrupt trigger delay.
Name
Bit
0x27
7
INT_5
6
5
4
Read/Write R/W
R/W
0
R/W
0
R/W
0
Reset
0
Value
Content
slo_no_mot_dur<5:2>
Bit
3
2
1
0
Read/Write R/W
R/W
0
R/W
0
R/W
0
Reset
0
Value
Content
slo_no_mot_dur<1:0>
slope_dur<1:0>
slo_no_mot_dur<5:0>:
Function depends on whether the slow-motion or no-motion
interrupt function has been selected. If the slow-motion interrupt function has
been enabled (slo_no_mot_sel = ‘0’) then [slo_no_mot_dur<1:0>+1]
consecutive slope data points must be above the slow/no-motion threshold
(slo_no_mot_th) for the slow-/no-motion interrupt to trigger. If the no-motion
interrupt function has been enabled (slo_no_mot_sel = ‘1’) then
slo_no_motion_dur<5:0> defines the time for which no slope data points
must exceed the slow/no-motion threshold (slo_no_mot_th) for the slow/no-
motion interrupt to trigger. The delay time in seconds may be calculated
according with the following equation:
slo_no_mot_dur<5:4>=’b00’ [slo_no_mot_dur<3:0> + 1]
slo_no_mot_dur<5:4>=’b01’ [slo_no_mot_dur<3:0> · 4 + 20]
slo_no_mot_dur<5>=’1’ [slo_no_mot_dur<4:0> · 8 + 88]
slope_dur<1:0>: slope interrupt triggers if [slope_dur<1:0>+1] consecutive slope data points
are above the slope interrupt threshold slope_th<7:0>
BST-BMA253-DS000-01 | Revision 1.0 | August 2015
Bosch Sensortec
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Note: Specifications within this document are subject to change without notice.