rights 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 symbols are registered trademarks of Robert Bosch GmbH, Germany.

2 | 2

Doc.-Number: BST-BMA421-FL000-00 / Version_1.0_122015

Pin

configuratio

n

Pin

Name

Description

1

SDO

address select

2

SDx

Serial data I/O

3

Power supply

4

ASDA

Serial data I/O – Secondary

Interface

5

INT1

Interrupt pin

6

INT2

Interrupt pin

7

Voltage supply

8

Ground

9

GND

Ground

10

CSB

SPI – Chip select

11

ASCL

Digital clock (in) – Secondary

Interface

12

SCx

Digital clock (in)

2) Plug ’n’ play intelligence operation: Acceleration data is

computed already within the BMA421.

The embedded intelligence of the sensor can trigger an interrupt

at certain selectable events which can be mapped to the

selectable interrupt pins. In addition to the electrical interrupt, the

status of the events and the counted steps are stored in the

register map and can be read out easily.

Embedded Intelligence:

 Step detector / Step counting

 Any-motion/No-motion

Feature parameters can be configured by the designer and thus

perfectly support the adoption to the required use case and

system design.

SYSTEM COMPATIBILITY

The BMA421 has been designed for best possible fit into

modern mobile consumer electronics devices. Beside the ultra-

small footprint and lowest power consumption, the BMA421 has

very wide ranges for VDD and VDDIO supply voltages. The

interfaces. The availability of a separate I²C interface enables

the connection of an external magnetometer (BMM150

recommended) and the synchronization of the acceleration and

the magnetometer data in the FIFO of the BMA421. This

reduces the complexity of sensor data fusion and improves its

precision as well. BMA421 is designed for plug ‘n’ play

functionality and ease-of-use in various system designs.

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 (top view)

1

2

3

4

5

6

10

9

8

7

12

11

BMA421

Top View

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