BMA400 Description
After correct power up by setting the correct voltage to the power pins, the BMA400 enters
automatically into the Power On Reset (POR) sequence, also called boot sequence. After having
completed boot, the BMA400 enters sleep mode where it consumes 160nA. No data conversions
happen in this phase, but register read-out and write is possible. Communication can start in I2C or SPI mode. The BMA400 automatically detects which format is used. When SPI format is used, the BMA400 switches to SPI4 mode and remains in this mode until reset. The switching to SPI requires to send the very first SPI packet twice: the first packet will be ignored by the BMA400.
BMA400 Features
The communication between application processor AP and BMA400 will happen either over I2C
or SPI interface. For more information about the interfaces, read the related chapter 6. Digital
Interfaces.
For information about connecting the BMA400 to the host (AP), read the related chapter 7. It
describes Pin-out and Connection Diagrams.
BMA400 Applications
Temperature Measurement
Pressure Measurement
Flow Meters
Factory Automation and Process Control
