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BMX160 Datasheet(HTML) 19 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) 19 Page - Bosch Sensortec GmbH

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BMX160
Data sheet
Page 19
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.
Table 11: Recommended presets for repetitions and output data rates
Preset
Recommended
ODR [Hz]
Max ODR
fmax,ODR
[Hz]
RMS noise
x/y/z [µT]
Average current consumption
at recommended ODR [mA]
(mag_if in low power mode)
Low Power
Preset
12.5
200
1.0/1.0/1.4
0.28
Regular Preset
12.5
100
0.6/0.6/0.6
0.66
Enhanced
Regular Preset
12.5
50
0.5/0.5/0.5
1.06
High
AccuracyPreset
12.5
12.5
0.3/0.3/0.3
3.00
2.2.2 PMU (Power Management Unit)
The integrated PMU (Power Management Unit) allows advanced power management features by
combining power management features of all built-in sensors and externally available wake-up
devices. See section 2.6.11, PMU Trigger (Gyro).
Automatic Gyroscope Power Mode Changes
To further lower the power consumption, the gyroscope may be configured to be temporarily put
into sleep mode, which is in BMX160 configurable as suspend or fast-start-up mode, when no
motion is detected by the accelerometer. This mode benefits from the accelerometer any-motion
and nomotion interrupt that is used to control the power state of the gyroscope. To configure this
feature Register (0x6C) PMU_TRIGGER is used.
Power Management of the Magnetometer
The PMU allows advanced power management with the magnetometer. To put the magnetometer
into suspend mode, magnetometer interface manual mode is required, see detail information in
section 2.4.3.1.1. Set the magnetometer interface after that to suspend mode using the
mag_set_pmu_mode command in the Register (0x7E) CMD. Changing the magnetometer
interface power mode to suspend does not imply any mode change in the magnetometer.
Configuration example can be found in section 2.4.3.1.3.
2.3 Sensor Timing and Data Synchronization
2.3.1 Sensor Time
The Register (0x18-0x1A) SENSORTIME is a free running counter, which increments with a
resolution of 39 µs. All sensor events e.g. updates of data registers are synchronous to this
register as defined in the table below. With every update of the data register or the FIFO, a bit m
in the Register (0x18-0x1A) SENSORTIME toggles where m depends on the output data rate for
the data register and the output data rate and the FIFO down sampling rate for the FIFO. The
table below shows which bit toggles for which update rate of data register and FIFO. The time
stamps in Register (0x18-0x1A) SENSORTIME are available independent of the power mode the
device is in.


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