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BMX160 Datasheet(HTML) 17 Page - Bosch Sensortec GmbH

Part No. BMX160
Description  Small, low power 9-axis sensor
Download  113 Pages
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Maker  BOSCH [Bosch Sensortec GmbH]
Homepage  https://www.bosch-sensortec.com
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BMX160 Datasheet(HTML) 17 Page - Bosch Sensortec GmbH

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BMX160
Data sheet
Page 17
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.
The power mode setting can be configured independently from the output data rate set. The main
difference between normal and low power mode is the power consumption as shown in the figure
below. If the sleep time between two configured sampling intervals becomes too short to duty
cycle between suspend and normal mode, the accelerometer stays automatically in normal mode.
In order to make the transition between low power and normal mode as transparent as possible,
an undersampling mode is defined in such a way that it mimics the behavior of the lower data rate
in low power mode in normal mode. The low power mode then only switches clock sources.
Figure 2: Low power and normal mode operation
2.2.1.1.1 Low Power Mode of Accelerometer
In low power modes the accelerometer toggles between normal mode and suspend mode. The
power consumption is given by the power consumption in normal mode times the fraction of time
the sensor is in normal mode. The time in normal mode is defined by the startup time of the MEMS
element, plus the analogue settling time. This results in a minimum time in normal mode of the
settling time plus (averaged samples)/1600 Hz.
Regarding register read and write operations, the note in section 0 applies.
2.2.1.1.2 Power Consumption of Accelerometer in Low Power Mode
When accelerometer and gyroscope are operated in normal mode, there is no significant
dependence on the specific settings like ODR, undersampling and bandwidth. The same applies
to the fast power up mode of the gyroscope. If the accelerometer, however, is operated in low
power mode and undersampling is enabled, the power consumption of it depends on the two
parameters ODR and number of averaging cycles.
In low power mode (gyroscope in suspend), the actual power consumption depends on the
selected setting in Register (0x40) ACC_CONF.


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