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