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BMX160 Datasheet(HTML) 15 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) 15 Page - Bosch Sensortec GmbH

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BMX160
Data sheet
Page 15
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.
2.2 Power Modes
By default BMX160 accelerometer, gyroscope, magnetometer and magnetometer interface are
in suspend mode after powering up the device. As mentioned in section 2.1, the data from the
magnetometer are handled and configured in a different way compared to the accelerometer or
gyroscope data. As a result, magnetometer and magnetometer interface have separate power
modes.
The device is powering up in less than 10 ms. In the following sections, the power modes for
accelerometer, gyroscope, magnetometer and magnetometer interface are described.
Table 7: Power modes of accel, gyro, mag_if and mag in BMX160
Accelerometer
Gyroscope
Magnetometer
Interface
Magnetometer
full operation
mode
Normal
mode
Force mode
Sleep modes
Fast Start-
up mode
Suspend
mode
Suspend
Low power
modes
Low power
mode
Force mode
Suspend and fast start-up modes are sleep modes. Switching between normal and low power
mode will not impact the output data from the sensor. This allows the system to switch from low
power mode to normal mode to read out the sensor data in the FIFO with a data rate limited by
the serial interface.
When all sensors are in suspend or low power mode, burst writes are not supported, normal
writes need wait times after the write command is issued (~400 µs), and burst reads are not
supported on Register (0x24) FIFO_DATA. If all sensors (accelerometer, gyroscope or
magnetometer) are in either suspend or low power mode, the FIFO must not be read.
Accelerometer
 Normal mode: Full chip operation
 Low power mode: Duty-cycling between suspend and normal mode. FIFO data readout
are supported in lower power mode to a limited extent, see Register (0x03) PMU_STATUS
 Suspend mode: No sampling takes place, all data is retained, and delays between
subsequent I2C operations are allowed. Sensors are powered off but the digital circuitry
is still active
Gyroscope
 Normal mode: Same as accelerometer
 Suspend mode: Same as accelerometer
 Fast start-up mode: In fast start-up mode the sensing analog part is powered down,
while the drive and the digital part remain largely operational. No data acquisition is
performed. The latest data rate and the content of all configuration registers are kept.
The fast start-up mode allows a fast transition (≤10 ms) into normal mode (and low
power mode for magnetometer) while keeping power consumption significantly lower
than in normal and low power mode


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