Datasheet

Datasheet
BMM150 Geomagnetic Sensor
Page 32
BST-BMM150-DS001-01 | Revision 1.0 | April 2013 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