Datasheet

Datasheet
BMM150 Geomagnetic Sensor
Page 23
BST-BMM150-DS001-01 | Revision 1.0 | April 2013 Bosch Sensortec
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third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
5.3 Chip ID
Register (0x40) Chip ID contains the magnetometer chip identification number, which is 0x32.
This number can only be read if the power control bit (register 0x4B bit0) is enabled.
Table 5: Chip identification number, register (0x40)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
1
1
0
0
1
0
Register (0x41) is reserved
5.4 Magnetic field data
Register (0x42) contains the LSB part of x-axis magnetic field data and the self-test result flag
for the x-axis.
Table 6: LSB part of x-axis magnetic field, register (0x42)
(0x42) Bit
Name
Description
Bit 7
DATAX_lsb <4>
Bit 4 of x-axis magnetic field data
Bit 6
DATAX_lsb <3>
Bit 3 of x-axis magnetic field data
Bit 5
DATAX_lsb <2>
Bit 2 of x-axis magnetic field data
Bit 4
DATAX_lsb <1>
Bit 1 of x-axis magnetic field data
Bit 3
DATAX_lsb <0>
Bit 0 of x-axis magnetic field data = x LSB
Bit 2
-
(fixed to 0)
Bit 1
-
(fixed to 0)
Bit 0
SelfTestX
Self-test result flag for x-axis, default is “1”
Register (0x43) contains the MSB part of x-axis magnetic field data.
Table 7: MSB part of x-axis magnetic field, register (0x43)
(0x43) Bit
Name
Description
Bit 7
DATAX_msb <12>
Bit 12 of x-axis magnetic field data = x MSB
Bit 6
DATAX_msb <11>
Bit 11 of x-axis magnetic field data
Bit 5
DATAX_msb <10>
Bit 10 of x-axis magnetic field data
Bit 4
DATAX_msb <9>
Bit 9 of x-axis magnetic field data
Bit 3
DATAX_msb <8>
Bit 8 of x-axis magnetic field data
Bit 2
DATAX_msb <7>
Bit 7 of x-axis magnetic field data
Bit 1
DATAX_msb <6>
Bit 6 of x-axis magnetic field data
Bit 0
DATAX_msb <5>
Bit 5 of x-axis magnetic field data