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2 / 12 page www.sensirion.com Version 1.0 – January 2010 2/12 Sensor Performance Relative Humidity1234 Parameter Condition min typ max Units 12 bit 0.04 %RH Resolution 1 8 bit 0.7 %RH typ 2.0 %RH Accuracy tolerance 2 max see Figure 2 %RH Repeatability 0.1 %RH Hysteresis 1 %RH Nonlinearity <0.1 %RH Response time 3 63% 8 s Operating Range extended 4 0 100 %RH Long Term Drift 5 normal < 0.5 %RH/yr ± 0 ± 2 ± 4 ± 6 ± 8 ± 10 0 10 20 30 40 50 60 70 80 90 100 Relative Humidity (%RH) RH (%RH) maximal tolerance typical tolerance Figure 2 Typical and maximal tolerance at 25°C for relative humidity. For extensive information see Users Guide, Sect. 1.2. Electrical Specification Parameter Conditions min typ max Units Supply Voltage, VDD 2.1 3.0 3.6 V sleep mode - 0.15 0.4 µA Supply Current, IDD 6 measuring 270 300 330 µA sleep mode - 0.5 1.2 µW measuring 0.8 0.9 1.0 mW Power Dissipation 6 average 8bit - 1.5 - µW Heater VDD = 3.0 V 5.5mW, T = + 0.5-1.5°C Communication digital 2-wire interface, true I2C protocol Table 1 Electrical specification. For absolute maximum values see Chapter 3 of Users Guide. 1 Default measurement resolution is 14bit (temperature) / 12bit (humidity). It can be reduced to 12/8bit, 11/11bit or 13/10bit by command to user register. 2 Accuracies are tested at Outgoing Quality Control at 25°C (77°F) and 3.0V. Values exclude hysteresis and non-linearity and are applicable to non- condensing environments only. 3 Time for achieving 63% of a step function, valid at 25°C and 1 m/s airflow. 4 Normal operating range: 0-80%RH, beyond this limit sensor may read a reversible offset with slow kinetics (<3%RH after 200hours at 90%RH). For more details please see Section 1.1 of the Users Guide. Temperature567 Parameter Condition min typ max Units 14 bit 0.01 °C Resolution 1 12 bit 0.04 °C typ 0.3 °C Accuracy tolerance 2 max see Figure 3 °C Repeatability 0.1 °C -40 125 °C Operating Range extended 4 -40 257 °F Response Time 7 63% 5 30 s Long Term Drift < 0.04 °C/yr ± 0.0 ± 0.5 ± 1.0 ± 1.5 ± 2.0 ± 2.5 ± 3.0 -40 -20 0 20 40 60 80 100 120 Temperature (°C) T (°C) Figure 3 Maximal tolerance for temperature sensor in °C. Packaging Information Sensor Type Packaging Quantity Order Number Tape & Reel 400 1-100707-01 Tape & Reel 1500 1-100645-01 SHT21 Tape & Reel 5000 1-100694-01 This datasheet is subject to change and may be amended without prior notice. 5 Value may be higher in environments with vaporized solvents, out-gassing tapes, adhesives, packaging materials, etc. For more details please refer to Handling Instructions. 6 Min and max values of Supply Current and Power Dissipation are based on fixed VDD = 3.0V and T<60°C. The average value is based on one 8bit measurement per second. 7 Response time depends on heat conductivity of sensor substrate. |
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