Datasheet

BMM150 Geomagnetic Sensor

Page 32

BST-BMM150-DS001-05 | Revision 1.4 | April 2020

Bosch Sensortec

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Note: Specifications within this document are subject to change without notice.

6. Digital interfaces

The BMM150 supports SPI and I²C digital interface protocols for communication as a slave with

a host device.

The active interface is selected by the state of the “protocol select” pin (PS):

PS: “0” (“1”) selects SPI (I²C).

By default, SPI operates in the standard 4-wire configuration. It can be re-configured by software

to work in 3-wire mode instead of standard 4-wire mode.

Both interfaces share the same pins. The mapping for each interface is given in the following

table:

Table 27: Mapping of the interface pins

Pin# Name use w/

SPI

use w/ I²C

Description

C1

SDO

SDO

I²C address

selection

SPI: Data Output (4-wire mode)

I²C: Used to set LSB of I²C address

B4

SDI

SDI

SDA

SPI: Data Input (4-wire mode) Data Input /

Output (3-wire mode)

I²C: Serial Data

A5

CSB

CSB

I²C address

selection

SPI: Chip Select (enable)

I²C: Used to set bit1 of I²C address

A3

SCK

SCK

SCL

SPI: Serial Clock

I²C: Serial Clock