Datasheet

Bosch Sensortec | BME680 Datasheet
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Document number: BST-BME680-DS001-00 Revision_1.0_072017
1.3 Humidity sensor specification
Table 6: Humidity parameter specification
Parameter
Symbol
Condition
Min
Typ
Max
Unit
Operating Range
11
-40
25
85
°C
0
100
% r.H.
Full accuracy range
0
65
°C
10
90
% r.H.
Supply Current
I
DD,H
1 Hz forced mode,
temperature and humidity
measurement
2.1
2.8
µA
Absolute Accuracy
A
H
20‒80 % r.H., 25 °C,
including hysteresis
±3
% r.H.
Hysteresis
12
H
H
10→90→10 % r.H., 25°C
±1.5
% r.H.
Nonlinearity
13
NL
H
10→90 % r.H., 25°C
1.7
% r.H.
Response time to
complete 63% of step
14
τ
0-63%
N
2
(dry) → 90 % r.H., 25°C
8
s
Resolution
R
H
0.008
% r.H.
Noise in humidity
(RMS)
N
H
Highest oversampling
0.01
% r.H.
Long-term stability
∆H
stab
10‒90 % r.H., 25°C
0.5
% r.H./
year
11
When exceeding the operating range (e.g. for soldering), humidity sensing performance is temporarily degraded and reconditioning is recommended as described in Section 7.7. Operating
range only for non-condensing environment.
12
For hysteresis measurement the sequence 0103050709070503010 % r.H. is used. The hysteresis is defined as the maximum difference between measurements at of
the same humidity up / down branch and the averaged curve of both branches.
13
Non-linear contributions to the sensor data are corrected during the calculation of the relative humidity by the compensation formulas described in Section 3.5.
14
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 approximately 1 m/s is needed.