BMA400 datasheet(13/121 Pages) BOSCH

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Bosch Sensortec | BMA400 Data sheet

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Modifications reserved | Data subject to change without notice

Document number: BST-BMA400-DS000-13 Revision_2.2_012025

1. Example 1: Testing communication with the BMA400, switch to SPI communication, state

data conversion, enable data ready interrupt and map it to INT1 pin

-reading chip id (checking correct communication) using I2C or SPI

power

chipid = read_reg(0x00)

chipid = 0x90 ?

communication: OK

communication: ERROR

Yes

I2C

SPI/I2C

I2C

Sleep

mode

End

power

dummy = read_reg(0x00)

chipid = 0x90 ?

communication: OK

communication: ERROR

Yes

chipid = read_reg(0x00)

SPI/I2C

SPI

SPI4

sleep

mode

–switching from sleep to normal mode, then SPI3 mode, then enable data ready interrupt and

map to pin int1

sleep

mode

Switch from sleep mode to

normal mode: ACC_CONFIG0

write_reg(addr=0x19,val=0x02)

wait(1500us)

write_reg(addr=0x21,val=0x80)

write_reg(addr=0x1A,val=0x38)

range=2g, osr=3 (high perf),

acc_odr=100Hz:

ACC_CONFIG1

write_reg(addr=0x1B,val=0x04)

Use acc_filt2 (100Hz fixed) as

data source: ACC_CONFIG2

write_reg(addr=0x1F,val=0x80)

Enable data ready interrupt:

INT_CONFIG0

Map data ready interrupt to

INT1 pin: INT_CONFIG1

write_reg(addr=0x7C,val=0x01)

Switch from SPI4 mode to

SPI3 mode: IF_CONF

SPI4

SPI3

Normal mode

data conv enabled

data ready int to int1

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