Datasheet

BMM150 Geomagnetic Sensor

Page 22

BST-BMM150-DS001-01 | Revision 1.0 | April 2013

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 subject to change without notice.

5. Register Description

5.1 General Remarks

The entire communication with the device’s magnetometer part is performed by reading from

and writing to registers. Registers have a width of 8 bits; they are mapped to a common space

of 50 addresses from (0x40) up to (0x71). Within the used range there are several registers

which are marked as ‘reserved’. Any reserved bit is ignored when it is written and no specific

value is guaranteed when read. Especially, in SPI mode the SDO pin may stay in high-Z state

when reading some of these registers.

Registers with addresses from (0x40) up to (0x4A) are read-only. Any attempt to write to these

registers is ignored.

5.2 Register map

Register Address

Default Value

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

0x71

N/A

0x70

N/A

0x6F

N/A

0x6E

N/A

0x6D

N/A

0x6C

N/A

0x6B

N/A

0x6A

N/A

0x69

N/A

0x68

N/A

0x67

N/A

0x66

N/A

0x65

N/A

0x64

N/A

0x63

N/A

0x62

N/A

0x61

N/A

0x60

N/A

0x5F

N/A

0x5E

N/A

0x5D

N/A

0x5C

N/A

0x5B

N/A

0x5A

N/A

0x59

N/A

0x58

N/A

0x57

N/A

0x56

N/A

0x55

N/A

0x54

N/A

0x53

N/A

0x52

0x00

0x51

0x00

0x50

0x00

0x4F

0x00

0x4E

0x07

Data Ready Pin En

Interrupt Pin En

Channel Z

Channel Y

Channel X

DR Polarity

Interrupt Latch

Interrupt Polarity

0X4D

0x3F

Data Overrun En

Overflow Int En

High Int Z en

High Int Y en

High Int X en

Low Int Z en

Low Int Y en

Low Int X en

0x4C

0x06

Self Test

0x4B

0x01

Soft Reset '1'

fixed '0'

fixed '0'

fixed '0'

fixed '0'

SPI3en

Soft Reset '1'

Power Control Bit

0x4A

0x00

Data Overrun

Overflow

High Int Z

High Int Y

High Int X

Low Int Z

Low Int Y

Low Int X

0x49

N/A

0x48

N/A

fixed '0'

Data Ready Status

0x47

N/A

0x46

N/A

Z-Self-Test

0x45

N/A

0x44

N/A

fixed '0'

fixed '0'

Y-Self-Test

0x43

N/A

0x42

N/A

fixed '0'

fixed '0'

X-Self-Test

0x41

N/A

0x40

0x32

w/r

w/r accessible

in suspend mode

read only

reserved

reserved

reserved

Chip ID = 0x32 (can only be read if power control bit ="1")

REPZ Number Of Repetitions (valid for Z) [7:0]

REPXY Number Of Repetitions (valid for XY) [7:0]

DATA X [12:5] MSB

DATA X [4:0] LSB

DATA Z [14:7] MSB

RHALL [5:0] LSB

DATA Y [12:5] MSB

DATA Y [4:0] LSB

High Threshold [7:0]

Low Threshold [7:0]

Adv. ST [1:0]

Data Rate [2:0]

DATA Z [6:0] LSB

Opmode [1:0]

RHALL [13:6] MSB