Specifications
BMA180
Preliminary data sheet
Bosch Sensortec
Rev. 1.0 Page 44 / - proprietary information - 06 March 2009
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Specifications within this document are preliminary and subject to change without notice. Document is not intended for publication.
7.9.7 Tap sensing
7.9.7.1 General explanation
BMA180 is providing a possibility to detect two consecutive slope events of a device and may
generate an interrupt.
7.9.7.2 Tap sensing interrupt configuration parameters and settings
The following configuration parameters/settings are provided (all unsigned integer)
• tapsens_int: This bit enables the tapsens_criteria to generate an interrupt
• tapsens_th defines the threshold level of the tip-shock.
• tapsens_int_x: defining if tap sensing event on x-axis should generate interrupt
• tapsens_int_y: defining if tap sensing event on y-axis should generate interrupt
• tapsens_int_z: defining if tap sensing event on y-axis should generate interrupt
• tapsens_filt: evaluation if interrupt generation is done with filtered (tapsens_filt = “1”) or
unfiltered (tapsens_filt = “0”) acceleration signal.
If tapsens_filt = 1, the signal is filtered and the slope condition(s) depend
on bw settings. Thus, n = 1200/BW
If tapsens_filt = 0, the signal is unfiltered and the slope condition(s)
depend only on the maximum bandwidth. Thus, n = 1.
.
• tapsens_dur: tapsens_dur (threshold duration) defines the maximum delay between 2
acceleration slope detections. The values of tapsens_dur are defined
below
tiptap_dur<2:0> Mode duration mode
duration
[ms]
(low
noise
mode)
mode
duration
[ms]
(low
power
mode)
000
120*Tupdate 50 25
001
180*Tupdate 75 37,5
010
240*Tupdate 100 50
011
360*Tupdate 150 75
100
600*Tupdate 250 125
101
1200*Tupdate 500 250
110
1800*Tupdate 750 375
111
2400*Tupdate 1000 500
• tapsens_shock if slope is detected within tapsens_shock, no interrupt is generated