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SHT15 Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers |
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5 / 9 page SHT1x / SHT7x Relative Humidity & Temperature Sensor System www.sensirion.com v2.02 July 2004 5/9 3 Converting Output to Physical Values 3.1 Relative Humidity To compensate for the non-linearity of the humidity sensor and to obtain the full accuracy it is recommended to convert the readout with the following formula1: 2 RH 3 RH 2 1 linear SO c SO c c RH • + • + = SORH c1 c2 c3 12 bit -4 0.0405 -2.8 * 10-6 8 bit -4 0.648 -7.2 * 10-4 Table 6 Humidity conversion coefficients For simplified, less computation intense conversion formulas see application note “RH and Temperature Non-Linearity Compensation”. The humidity sensor has no significant voltage dependency. # # # ! " $ & SORH sensor readout (12bit) Figure 10 Conversion from SORH to relative humidity 3.1.1 Humidity Sensor RH/Temperature compensation For temperatures significantly different from 25 °C (~77 °F) the temperature coefficient of the RH sensor should be considered: linear RH 2 1 C true RH ) SO t (t 25) - (T RH + • + • = ° SORH t1 t2 12 bit 0.01 0.00008 8 bit 0.01 0.00128 Table 7 Temperature compensation coefficients This equals ~0.12 %RH / °C @ 50 %RH 1 Where SORH is the sensor output for relative humidity 3.2 Temperature The bandgap PTAT (Proportional To Absolute Temperature) temperature sensor is very linear by design. Use the following formula to convert from digital readout to temperature: T 2 1 SO d d e Temperatur • + = VDD d1 [°C] d1 [°F] SOT d2 [°C] d2 [°F] 5V -40.00 -40.00 14bit 0.01 0.018 4V -39.75 -39.50 12bit 0.04 0.072 3.5V -39.66 -39.35 3V -39.60 -39.28 2.5V -39.55 -39.23 Table 8 Temperature conversion coefficients For improved accuracies in extreme temperatures with more computation intense conversion formulas see application note “RH and Temperature Non-Linearity Compensation”. 3.3 Dewpoint Since humidity and temperature are both measured on the same monolithic chip, the SHTxx allows superb dewpoint measurements. See application note “Dewpoint calculation” for more. |
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