BMA423 datasheet(29/129 Pages) BOSCH

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Data Sheet

BMA423

Page 29

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.

Sample drop frames will be inserted only for transition phases after configuration changes, not for

samples dropped between sensor enable and first valid sample. For a detailed description of

configuration changes see Section 4.4, Subsection “Configuration Changes”.

FIFO Partial frame reads

When a frame is only partially read through the Register FIFO_DATA it will be repeated completely

with the next access both in headerless and in header mode. In headermode, this includes the header.

In the case of a FIFO overflow between the first partial read and the second read attempt, the frame

may be deleted.

FIFO overreads

When more data are read from the FIFO than it contains valid data, 0x8000 is returned in headerless

mode. In header mode 0x80 indicates an invalid frame.

FIFO data synchronization

All sensor data are sampled with respect to a common ODR time grid. Even if a different ODR is

selected for the acceleration and the magnetic sensor the data remains synchronized:

If a frame contains a sample from a sensor element with ODR x, then it must contain also samples of

all sensor elements with an ODR y>=x. This applies for steady state operation. In transition phases, it

is more important not to lose data, therefore exceptions are possible if the sensor elements with ODR

y>=x

not

have

data,

e.g.

due

sensor

configuration

change.

FIFO Data Synchronization Scheme in the following figure illustrates the steady state and transient

operating conditions.

ACC

MAG

ACC

MAG

1/ODR_ACC

1/ODR_MAG

ACC

MAG

ACC enabled

ACC start-up time

Frame inconsistency

accepted during

transition phases

MAG start-up time

MAG enabled

Steady state

operation

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