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BMX160 Datasheet(HTML) 35 Page - Bosch Sensortec GmbH

Part No. BMX160
Description  Small, low power 9-axis sensor
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Maker  BOSCH [Bosch Sensortec GmbH]
Homepage  https://www.bosch-sensortec.com
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BMX160 Datasheet(HTML) 35 Page - Bosch Sensortec GmbH

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BMX160
Data sheet
Page 35
BST-BMX160-DS000-12 | Revision 1.2 | January 2019
Bosch Sensortec
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third
parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are preliminary and
subject to change without notice.
configurable threshold min_threshold and a minimum delay time min_steptime between two
consecutive peaks needs to be observed. The step detector can be configured in three modes:
 Normal mode (default setting, recommended for most applications)
 Sensitive mode (can be used for light weighted, small persons)
 Robust mode (can be used, if many false positive detections are observed)
More details can be found in Register (0x7A-0x7B) STEP_CONF and the according step counter
application note.
The step detector is the trigger for a step counter. The step counter is described in more detail in
section 2.7.
2.6.4 Tap Sensing (Accel)
Double-Tap implements same functionality as two single taps in a short well-defined period of
time. If the period of time is too short or too long no interrupt is fired.
The interrupt is configured in the Register (0x63-0x64) INT_TAP. When the preset threshold
int_tap_th is exceeded, a tap is detected, an int_s_tap_int in Register (0x1C-0x1F) INT_STATUS
is set and an interrupt is fired. The double-tap interrupt is generated only when a second tap is
detected within a specified period of time. In this case, the int_d_tap_int in Register (0x1C-0x1F)
INT_STATUS is set.
The slope between two successive acceleration data is needed to detect a tap-shock and quiet-
period. The time difference between the two successive acceleration values depends on data rate
selected for the interrupt source, which depends on the configured downsampling rate in Register
(0x58-0x59) INT_DATA and the configured output data rate in Register (0x40) ACC_CONF, when
filtered data have been selected in the Register (0x58-0x59) INT_DATA. The time delay
int_tap_dur between two taps is typically between 12.5 ms and 500 ms. The threshold is typically
between 0.7g and 1.5g in 2g measurement range. Due to different coupling between sensor and
device shell (housing) and different measurement ranges of the sensor these parameters are
configurable.
The criteria for a double-tap are fulfilled and an interrupt is generated if the second tap occurs
after int_tap_quiet and within int_tap_dur. The tap direction is determined by the 1st tap. If during
int_tap_quiet period (30/20 ms) a tap occurs, it will be considered as a new tap.
The slope detection interrupt logic stores the direction of the (first) tap-shock in a status register.
This register needs to be locked for int_tap_shock 50/75 ms in order to prevent other slopes to
overwrite this information.


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