Datasheet

BMP280 Digital Pressure Sensor

Page 19

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.

3.8.2 Measurement rate in normal mode

The following table explains which measurement rates can be expected in normal mode based

Table 14: typical output data Rate (ODR) in normal mode [Hz]

Oversampling

setting

0.5

62.5

125

250

500

1000

2000

4000

Ultra low power

166.67

14.71

7.66

3.91

1.98

0.99

0.50

0.25

Low power

125.00

14.29

7.55

3.88

1.97

0.99

0.50

0.25

Standard

resolution

83.33

13.51

7.33

3.82

1.96

0.99

0.50

0.25

High resolution

50.00

12.20

6.92

3.71

1.92

0.98

0.50

0.25

Ultra high

resolution

26.32

10.00

6.15

3.48

1.86

0.96

0.49

0.25

Table 15: Sensor timing according to recommended settings (based on use cases)

Use case

Mode

Over-

sampling

setting

osrs_p

osrs_t

IIR

filter

coeff.

(see

3.3.3)

Timing

ODR

[Hz]

(see

3.8.2)

BW

[Hz]

(see

3.3.3)

handheld device

low-power (e.g.

Android)

Normal

Ultra high

resolution

×16

×2

4

62.5 ms

10.0

0.92

handheld device

dynamic (e.g.

Android)

Normal

Standard

resolution

×4

×1

16

0.5 ms

83.3

1.75

Weather

monitoring

(lowest power)

Forced

Ultra low

power

×1

×1

Off

1/min

1/60

full

Elevator / floor

change

detection

Normal

Standard

resolution

×4

×1

4

125 ms

7.3

0.67

Drop detection

Normal

Low

power

×2

×1

Off

0.5 ms

125

full

Indoor

navigation

Normal

Ultra high

resolution

×16

×2

16

0.5 ms

26.3

0.55

3.9 Data readout

To read out data after a conversion, it is strongly recommended to use a burst read and not

address every register individually. This will prevent a possible mix-up of bytes belonging to

different measurements and reduce interface traffic. Data readout is done by starting a burst read

from 0xF7 to 0xFC. The data are read out in an unsigned 20-bit format both for pressure and for

temperature. It is strongly recommended to use the BMP280 API, available from Bosch