BMP388 datasheet(13/59 Pages) BOSCH

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Bosch Sensortec | BMP388 Datasheet

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Modifications reserved |Data subject to change without notice | Printed in Germany

Document number: BST-BMP388-DS001-07 Revision_1.7_112020

3.3.4. Mode transition diagram

The supported mode transitions are displayed below. If the device is currently performing a measurement, execution of mode

switching commands is delayed until the end of the currently running measurement period. Further mode change commands

are ignored until the last mode change command is executed. Also, mode change commands that are not legal are ignored.

Power OFF

(VDDA or VDDD = 0)

VDDA and VDDD

supplied

Sleep

Normal

(cyclic standby and

measurement periods)

Forced

(one measurement

period)

Figure 4: Mode transition diagram

3.4.

Measurement flow

The BMP388 measurement period consists of a temperature and pressure measurement with selectable oversampling. After

the measurement period, the data are passed through an optional IIR filter, which removes short-term fluctuations in pressure

(e.g. caused by slamming a door). The flow is depicted in the diagram below.

Figure 5: BMP388 measurement cycle

The individual blocks of the diagram above will be detailed in the following subsections.

Measure pressure

(oversampling set by osrs_p;

skip if press_en = 0)

Start

measurement cycle

Measure temperature

(oversampling set by osrs_t;

skip if temp_en = 0)

IIR filter enabled?

End

measurement cycle

IIR filter initialised?

Copy ADC values

to filter memory

(initalises IIR filter)

Update filter memory using

filter memory, ADC value

and filter coefficient

Yes

Copy filter memory

to output registers,

send filter memory to FIFO

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