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Document number: BST-BME280-DS001-23 Revision_1.23_012022

1.2 Humidity parameter specification

Table 2: Humidity parameter specification

Parameter

Symbol

Condition

Min

Typ

Max

Unit

Operating range1

For temperatures

< 0 °C and > 60 °C

see Figure 1

-40

°C

100

%RH

Supply current

IDD,H

1 Hz forced mode,

humidity and

temperature

1.8

2.8

µA

Absolute accuracy

tolerance

20…80 %RH,

25 °C, including

hysteresis

±3

%RH

Hysteresis2

109010 %RH,

25 °C

±1

%RH

Nonlinearity3

NLH

1090 %RH, 25 °C

%RH

Response time to

complete 63% of step4

��63% 900or090%RH,

25°C

Resolution

0.008

%RH

Noise in humidity (RMS)

Highest oversampling,

see chapter 3.6

0.02

%RH

Long term stability

∆

Hstab

10…90 %RH, 25 °C

0.5

%RH/

year

When exceeding the operating range (e.g. for soldering), humidity sensing performance is temporarily degraded and

reconditioning is recommended as described in section 7.8. Operating range only for non-condensing environment.

For hysteresis measurement the sequence 103050709070503010 %RH is used. The hysteresis is defined as

the difference between measurements of the humidity up / down branch and the averaged curve of both branches

Non-linear contributions to the sensor data are corrected during the calculation of the relative humidity by the compensation

formulas described in section 4.2.3.

The air-flow in direction to the vent-hole of the device has to be dimensioned in a way that a sufficient air exchange inside to

outside will be possible. To observe effects on the response time-scale of the device an air-flow velocity of approx. 1 m/s is

needed.

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