Si7022-A10
6 Rev. 1.1
Figure 2. RH Accuracy at 30 °C
Table 4. Humidity Sensor
1.9 ≤ V
DD
≤ 3.6 V; T
A
= 30 °C
Parameter Symbol Test Condition Min Typ Max Unit
Operating Range
1
Non-condensing 0 — 100 %RH
Accuracy
2, 3
0 – 80% RH — ±3 ±4 %RH
80 – 100% RH See Figure 2
Repeatability/Noise — 0.025 — %RH RMS
Resolution — 11 — Bits
Response Time
4
τ
63%
1 m/s airflow, with or without cover — 6 — S
Drift vs. Temperature — 0.05 — %RH/°C
Hysteresis — ±1 — %RH
Long Term Stability
3
—<0.25 — %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 “4.1. Relative Humidity Sensor Accuracy” for more details.
3. Drift due to aging effects at typical room conditions of 30 °C and 30% to 50% RH. May be impacted by dust, vaporized
solvents or other contaminants, e.g., out-gassing tapes, adhesives, packaging materials, etc. See section “4.7. 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.
