Datasheet

BMP280 Digital Pressure Sensor

Page 14

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

Bosch Sensortec

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

Table 6: filter settings

Filter coefficient

Samples to reach ≥75 %

of step response

Filter off

1

2

2

4

5

8

11

16

22

In order to find a suitable setting for filter, please consult chapter 3.4.

When writing to the register filter, the filter is reset. The next value will pass through the filter and

be the initial memory value for the filter. If temperature or pressure measurement is skipped, the

corresponding filter memory will be kept unchanged even though the output registers are set to

0x80000. When the previously skipped measurement is re-enabled, the output will be filtered

using the filter memory from the last time when the measurement was not skipped.

3.4 Filter selection

In order to select optimal settings, the following use cases are suggested:

Table 7: Recommended filter settings based on use cases

Use case

Mode

Over-

sampling

setting

osrs_p

osrs_t

IIR

filter

coeff.

(see

3.3.3)

[µA]

(see

3.7)

ODR

[Hz]

(see

3.8.2)

RMS

Noise

[cm]

(see

3.5)

handheld device

low-power

(e.g. Android)

Normal

Ultra high

resolution

×16

×2

4

247

10.0

4.0

handheld device

dynamic

(e.g. Android)

Normal

Standard

resolution

×4

×1

16

577

83.3

2.4

Weather

monitoring

(lowest power)

Forced

Ultra low

power

×1

×1

Off

0.14

1/60

26.4

Elevator / floor

change detection

Normal

Standard

resolution

×4

×1

4

50.9

7.3

6.4

Drop detection

Normal

Low

power

×2

×1

Off

509

125

20.8

Indoor navigation

Normal

Ultra high

resolution

×16

×2

16

650

26.3

1.6