BMA423 datasheet(24/129 Pages) BOSCH

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Data Sheet

BMA423

Page 24

BST-BMA423-DS000-00 | Version 1.0 | August 2017

Bosch Sensortec

BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.

Note: Specifications within this document are subject to change without notice.

4.5. FIFO

The device supports the following FIFO operating modes:

 Streaming mode: overwrites oldest data on FIFO full condition

 FIFO mode: discards newest data on FIFO full condition

The FIFO depth is 1024 byte and supports the following interrupts:

 FIFO full interrupt

 FIFO watermark interrupt

FIFO is enabled with FIFO_CONFIG_1.fifo_acc_en=0b1 (0b0= disabled). To enable the FIFO for the

auxiliary interface (magnetometer) set FIFO_CONFIG_1.fifo_aux_en=0b1 (0b0=disabled).

Frames

The FIFO captures data in frames, which consist of a header and a payload. The FIFO can be

configured to skip the header (headerless mode) in which case only payload is stored.

 In header mode (standard configuration) each regular frame consists of a one byte header

describing properties of the frame, (which sensors are included in this frame) and the data

itself. Beside the regular frames, there are control frames.

 In headerless mode the FIFO contains sampled data only.

Header mode

The header has a length of 8 bit and the following format:

Bit

Content

fh_mode<1:0>

fh_parm<3:0>

fh_ext<1:0>

These fh_mode and fh_parm and fh_ext fields are defined below

fh_mode<1:0>

Definition

fh_parm <3:0>

fh_ext<1:0>

0b10

Regular

Enabled sensors

Tag of INT2 and INT1

0b01

Control

Control opcode

0b00 and 0b11

Reserved

f_parm=0b0000 is invalid for regular mode, a header of 0x80 indicates an uninitialized frame.

In a regular frame, fh_parm frame defines which sensors are included in the data part of the frame.

The format is

Name

fh_parm<3:0>

Bit

Content

Reserved

FIFO_aux_data

Reserved

FIFO_acc_data

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