Bosch Sensortec | BMM350 – High-performance magnetometer

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Data & Specification are preliminary and subject to change without notice | | Bosch Sensortec GmbH reserves all rights in the event of industrial property rights.

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Doc.-Number: BST-BMM350-FL000-00 / Version_1.0_102022

Pin

Name

Description

C3

BYPASS

Connect to ground

C2

CRST

Connect to external 2.2 uF

capacitor, low inductance

C1

VDD

Digital and analog supply, use

decoupling capacitor

B3

VDDIO

IO supply, use decoupling

capacitor

B2

ADSEL

The logic status of ADSEL defines

the LSB to the I2C address.

Connect ADSEL to GND or VDDIO

B1

GND

Analog, digital and IO ground

A3

SCK

I2C / I3C clock

A2

SDA

I2C / I3C data

A1

INT

Interrupt output

The sensor module is housed in a compact 9-pin wafer

level chip scale package (WLCSP) with a footprint of only

1.28 x 1.28 m² and a sensor height of 0.5 mm. Its small

dimensions and its low power consumption allow the

implementation in battery driven devices. The emerging

applications in wearables, industrial areas and home

appliances require a low current consumption and a low

total cost of ownership at the same time.

4 Sensor operation

The BMM350 knows two major modes of operation,

“normal mode” and “forced mode”. The “suspend mode”

brings the device into minimal power consumption, where

settings are retained, and communication is possible while

data conversions are stopped. A set of choices for the

sensors output data rate and signal averaging is available

ranging from ultra-low noise to low power setting to adapt

the sensor to the target application trading noise versus

power consumption.

BMM350 is equipped with an API function which helps

setting the averaging/noise performance. The API checks

for illegal combinations of settings and automatically

chooses the setting with best noise performance.

The BMM350 has built-in-measures to recover from

excessively strong magnetic fields (up to 400 mT) which

would lead to a performance deterioration in competitor

products. This feature is called “field shock recovery”.

Fields of up to 100 times of the measurement range are

tolerated without performance degradation.

5 System compatibility

The BMM350 has been designed for the best possible fit

into modern mobile consumer electronics devices. Besides

the ultra-small footprint and very low power consumption,

the BMM350 has a given range for VDD (1.72 V to 1.98 V)

and VDDIO (1.72 V to 3.6 V) supply voltages.

Headquarters

Bosch Sensortec GmbH

Gerhard-Kindler-Strasse 9

72770 Reutlingen · Germany

Telephone +49 7121 3535 900

Fax +49 7121 3535 909

www.bosch-sensortec.com

Pin configuration