Datasheet

BMM150 Geomagnetic Sensor

Page 15

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.

Note:

Please also see chapter 5 for detailed register descriptions.

4.3.2 Magnetic field data temperature compensation

The raw register values DATAX, DATAY, DATAZ and RHALL are read out from the host

processor using the BMM150 API/driver which is provided by Bosch Sensortec. The API/driver

performs an off-chip temperature compensation and outputs x/y/z magnetic field data in

16 LSB/µT to the upper application layer:

Figure 3: Calculation flow of magnetic field data from raw BMM150 register data

The API/driver performs all calculations using highly optimized fixed-point C-code arithmetic.

For platforms that do not support C code, a floating-point formula is available as well.

BMM150

sensor

Hardware level

Software

driver level

BMM150

API / driver

(provided by

Bosch Sensortec)

Application

Software

application level

Magnetometer raw register data

(DATAX, DATAY, DATAZ, RHALL)

Temperature and sensitivity compensated

magnetic field data x/y/z available in:

- short int (16 LSB/µT, limited Z range)

- long int (16 LSB/µT)

- float (µT)

Config

Config

a