BMA250 Bosch Sensortec, BMA250 Datasheet - Page 28
Manufacturer Part Number
3-AXIS ACCELEROMETER DIGITAL I/F
Specifications of BMA250
BMA250 - Digital, Triaxial Acceleration Sensor
X, Y, Z
±2g, 4g, 8g, 16g
256LSB/g, 128LSB/g, 64LSB/g, 16LSB/g
Voltage - Supply
1.62 V ~ 3.6 V
8Hz ~ 1kHz
Package / Case
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With
828-1024 - BMA250 DAUGHTERCARD FOR DEV KIT
126.96.36.199 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.
188.8.131.52 Double tap detection
A double tap is detected and the 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 cleared after a delay of 12.5 ms.
184.108.40.206 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
The length of (0x2A) tap_dur can be selected by setting the (0x2A) tap_dur bits according to
220.127.116.11 Axis and sign information of tap sensing
The sign of the slope of the first tap which triggered the interrupt is stored in bit (0x0B) tap_sign
(´0´ means positive sign, ´1´ means negative sign). The value of this bit persists after clearing
The axis which triggered the interrupt is indicated by bits (0x0B) tap_first_x, (0x0B) tap_first_y,
and (0x0B) tap_first_z.
The bit corresponding to the triggering axis contains a ´1´ while the other bits hold a ´0´. These
bits are cleared together with clearing the interrupt status.
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Note: Specifications within this document are subject to change without notice.
Table 15: Selection of tap_dur
length of tap_dur
Page 28 / not for publishing
03 March 2011