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Bosch Sensortec | BMP280 Data sheet

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Document number: BST-BMP280-DS001-26 Revision_1.26_102021

3.5

Noise

Noise depends on the oversampling and filter settings selected. The stated values were determined in

a controlled pressure environment and are based on the average standard deviation of 32 consecutive

measurement points taken at highest sampling speed. This is needed in order to exclude long term

drifts from the noise measurement.

Table 8: Noise in pressure

Typical RMS noise in pressure [Pa]

Oversampling setting

IIR filter coefficient

off

Ultra low power

3.3

1.9

1.2

0.9

0.4

Low power

2.6

1.5

1.0

0.6

0.4

Standard resolution

2.1

1.2

0.8

0.5

0.3

High resolution

1.6

1.0

0.6

0.4

0.2

Ultra high resolution

1.3

0.8

0.5

0.4

0.2

Table 9: Noise in temperature

Typical RMS noise in temperature [°C]

Temperature oversampling

IIR filter off

oversampling ×1

0.005

oversampling ×2

0.004

oversampling ×4

0.003

oversampling ×8

0.003

oversampling ×16

0.002

3.6

Power modes

The BMP280 offers three power modes: sleep mode, forced mode and normal mode. These can be

selected using the mode[1:0] bits in control register 0xF4.

Table 10: mode settings

mode[1:0]

Mode

Sleep mode

01 and 10

Forced mode

Normal mode

3.6.1

Sleep mode

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

and power consumption (IDDSM) is at a minimum. All registers are accessible; Chip-ID 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

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