SI7015-A20 Datasheet, PDF (7/39 Pages) Silicon Laboratories – DIGITAL IC HUMIDITY AND TEMPERATURE SENSOR

Si7015-A20
Table 4. Humidity Sensor
1.9 ≤ V_DD ≤ 3.6 V; T_A = 30 °C; default conversion time unless otherwise noted.
Parameter
Operating Range¹
Accuracy^{2, 3}
Symbol
Test Condition
Non-condensing
0 – 80% RH
Min Typ Max
0
— 100
— ±3.0 ±4.5
Unit
%RH
%RH
80 – 100% RH
See Figure 2.
%RH
Repeatability/Noise
Normal Mode
— 0.05 — %RH RMS
Fast Mode
—
0.2
— %RH RMS
Response Time⁴
τ_63%
1 m/s airflow, with cover
1 m/s airflow, without cover
—
18
—
—
17
—
S
Drift vs. Temperature
— 0.05 —
%RH/°C
Hysteresis
Long Term Stability³
—
±1
—
— < 0.25 —
%RH
%RH/yr
Notes:
1. Recommended humidity operating range is 20% to 80% RH (non-condensing) over –10 °C to 60 °C.
Prolonged operation beyond these ranges may result in a shift of sensor reading with slow recovery time.
2. Excludes hysteresis, long term drift, and certain other factors and is applicable to non-condensing environments only.
See Section “4.2. Relative Humidity Sensor Accuracy” for more details.
3. Drift due to aging effects at typical room conditions of 30C and 30% to 50%. May be impacted by dust, vaporized
solvents or other contaminants, e.g., out-gassing tapes, adhesives, packaging materials, etc. See Section “4.9. Long
Term Drift/Aging”.
4. Response time to a step change in RH. Time for the RH output to change by 63% of the total RH change.
RHAccuracy
Max.RHError(±%)
Typ.RHError(±%)
10
9
8
7
6
5
4
3
2
1
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
RelativeHumidity(%)
Figure 2. RH Accuracy at 30 °C
Rev. 1.0
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