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Data Sheet

BMA423

Page 21

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.

Accelerometer data processing for low power mode

Low

power

mode

can

enabled

PWR_CONF.adv_power_save=0b1

and

ACC_CONF.acc_perf_mode=0b0. In this power mode, the accelerometer regularly changes between

a suspend power mode phase where no measurement is performed and a performance power mode

phase, where data is acquired. The period of the duty cycle for changing between suspend and

performance mode will be determined by the output data rate (ACC_CONF.acc_odr). The output data

rate can be configured in one of 10 different valid ODR configurations going from 0.78Hz up to 400Hz.

The samples acquired during the normal mode phase will be averaged and the result will be the output

data. The number of averaged samples can be determined by the parameter ACC_CONF.acc_bwp

through the following formula:

averaged samples = 2(Val(acc_bwp))

skipped samples = (1600/ODR)-averaged samples

A higher number of averaged samples will result in a lower noise level of the signal, but since the

performance power mode phase is increased, the power consumption will also rise.

Data Ready Interrupt

This interrupt fires whenever a new data sample set from accelerometer, and auxiliary sensor is

complete. This allows a low latency data readout. In non-latched mode, the interrupt and the flag in

unwanted, latched-mode can be used (see chapter 4.7).

In order to enable/use the data ready interrupt map it on the desired interrupt pin via INT_MAP_DATA.

Temperature Sensor

The temperature sensor has 8 bits. The temperature value is defined in Register TEMPERATURE and

updated every 1.28 s.

It is always on, when a sensor is active.

Value

Temperature

0x7F

150 °C

…

0x00

23 °C

…

0x81

-104 °C

0x80

Invalid

When there is no valid temperature information available (i.e. last measurement before the time

defined above), the temperature indicates an invalid value: 0x80.

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