Datasheet

BMP280 Digital Pressure Sensor

Page 16

BST-BMP280-DS001-19 | Revision 1.19 | January 2018

Bosch Sensortec

© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third

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

Note: Specifications within this document are subject to change without notice. Not intended for publication.

3.6.1 Sleep mode

Sleep mode is set by default after power on reset. In sleep mode, no measurements are

and compensation coefficients can be read.

3.6.2 Forced mode

In forced mode, a single measurement is performed according to selected measurement and filter

options. When the measurement is finished, the sensor returns to sleep mode and the

measurement results can be obtained from the data registers. For a next measurement, forced

mode needs to be selected again. This is similar to BMP180 operation. Forced mode is

recommended for applications which require low sampling rate or host-based synchronization.

time

POR

Mode[1:0] = 01

Data readout

osrs_t

osrs_p

Write

settings

Mode[1:0] = 01

Figure 3: Forced mode timing diagram

3.6.3 Normal mode

Normal mode 16ontinuously cycles between an (active) measurement period and an (inactive)

slightly higher than in sleep mode. After setting the mode,measurement and filter options, the

last measurement results can be obtained from the data registers without the need of further

write accesses. Normal mode is recommended when using the IIR filter, and useful for

applications in which short-term disturbances (e.g. blowing into the sensor) should be filtered.

time

POR

Mode[1:0] = 11

Data readout

when needed

osrs_t

osrs_p

Write

settings

Figure 4: Normal mode timing diagram