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Confidential
BST-BMA400-DS000-00 | Version 0.1 | November 2017 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.
6. Digital Interfaces
6.1. Interface
By default, the BMA400 operates in I2C mode. The BMA400 interface can also be configured to
operate in a SPI 4-wire configuration. It can also be re-configured by software to work in 3-wire mode
instead of 4-wire mode.
All 3 possible digital interfaces share partly the same pins. The mapping for the primary interface of
the BMA400 is given in the following table:
Pin#
Name
I/O Type
Description
Connect to (Primary IF)
in SPI4W
in SPI3W
in I2C
1
SDO
Digital I/O
Serial data output in SPI
Address select in I²C mode
see chapter 7.2
SDO
DNC (float)
GND for
default I2C
addr.
2
SDX
Digital I/O
SDA serial data I/O in I²C
SDI serial data input in SPI 4W
SDA serial data I/O in SPI 3W
SDI
SDA
SDA
5
INT1
Digital I/O
Interrupt output 1 (default)
(Input for external FIFO sync) *
INT1
(FIFO sync)
INT1
(FIFO sync)
INT1
(FIFO sync)
6
INT2
Digital I/O
Interrupt output 2 (default)
(Input for external FIFO sync) *
INT2
(FIFO sync)
INT2
(FIFO sync)
INT2
(FIFO sync)
10
CSB
Digital in
Chip select for SPI mode
CSB
CSB
V
DDIO
or
DNC (float)
12
SCX
Digital in
SCK for SPI serial clock
SCL for I²C serial clock
SCK
SCK
SCL
* INT1 and/or INT2 can also be configured as an input in case the external data synchronization in FIFO is used. See chapter 0. If INT1
and/or INT2 are not used, please do not connect them (DNC).
The following table shows the electrical specifications of the interface pins:
Parameter
Symbol
Condition
Min
Typ
Max
Units
Pull-up Resistance,
CSB pin
R
up
Internal Pull-up
Resistance to
VDDIO
75
100
TBD
k
Input Capacitance
C
in
5
pF
I²C Bus Load
Capacitance (max.
drive capability)
C
I2C_Load
TBD
pF
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