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.

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