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BMX160 Datasheet(HTML) 49 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) 49 Page - Bosch Sensortec GmbH

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BMX160
Data sheet
Page 49
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.
In order to ensure a proper interpretation of the self-test signal it is recommended to perform the
self-test for both (positive and negative) directions and then to calculate the difference of the
resulting acceleration values. The table below shows the minimum absolute differences for each
axis. The actual absolute measured signal differences can be significantly larger.
Table 27: Accelerometer self-test minimum difference values
x-axis signal
y-axis signal
z-axis signal
Minimum
difference signal
2 g
2 g
2 g
It is recommended to perform a reset of the device after a self-test has been performed. If the
reset cannot be performed, the following sequence must be kept to prevent unwanted interrupt
generation: disable interrupts, change parameters of interrupts, wait for at least 50 ms, enable
desired interrupts.
2.8.2 Self-Test Gyroscope
The gyroscope BIST can be triggered during normal operation mode. It checks the sensors drive
amplitude, its frequency and the stability of the drive control loop. Hence, disturbances of the
movement by particles, mechanical damage or pressure loss can be detected.
The self-test for the gyroscope will be started by writing a “1” to gyr_self_test_enable in Register
(0x6D) SELF_TEST. The result will be in gyr_self_test_ok in
Register (0x1B) STATUS.
In addition, any particles or damages can be easily identified in a „Manual Performance Check“.
Due to the outstanding offset and noise performance the measured values at zero-rate fit the
specified performance.
2.8.3 Self-Test Magnetometer
The magnetometer supports two self-tests modes: Normal self-test and advanced self-test.
Normal Self-Test
During normal self-test, the following verifications are performed:
 FlipCore signal path is verified by generating signals on-chip. These are processed
through the signal path and the measurement result is compared to known thresholds
 FlipCore (X and Y) connection to ASIC are checked for connectivity and short circuits
 Hall sensor connectivity is checked for open and shorted connections
 Hall sensor signal path and hall sensor element offset are checked for overflow
To perform a self-test, the magnetometer interface must first be put into normal mode by writing
0x19 into Register (0x7E) CMD and then be configured into setup mode by setting
mag_manual_en bit in Register (0x4C-0x4F) MAG_IF to “1”.
After the configuration of the magnetometer interface, the magnetometer itself must be put into
sleep mode. Self-test mode is then entered by setting the bit “Self-test” (indirect mag register write
to 0x4C bit0) to “1”. After performing self-test, this bit is set back to “0”. When self-test is
successful, the corresponding self-test result bits are set to “1” (indirect mag register read from


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