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HP02S Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers |
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HP02S Datasheet(HTML) 3 Page - List of Unclassifed Manufacturers |
3 / 6 page Hope RF HP02S BAROMETER MODULE 2011-6-8 Version: 1.4 3 Pressure and Temperature Measurement The main function of HP02S system is to convert the uncompensated pressure and temperature signal from a pressure sensor. After the conversion, the following two values can be obtained: . measured temperature “T1” . measured pressure “D1” As the sensor is strongly temperature dependent, it is necessary to compensate for these effects. Therefore 5 sensor-specific coefficients are stored on the HP02S at our manufacturing facility, and they allow an accurate software compensation in the application. The 5 coefficients are: . “D0”: Offset of pressure coefficient. . “T0”: Offset temperature. . “P0”: Offset fine tuning of pressure. . “S”: Temperature coefficient of sensitivity. . “C”: Constant parameter for each sensor. Note: Make sure to pull low XCLR before start to Read these coefficients or the data read out is probably incorrect Pressure and Temperature Calculation: Step 1: (calculate offset, sensitivity and final pressure value) dUP=D1-D0 dUT=(29*(T1-T0)/50-(T1-T0)^2/76666)*S/C P=P0+100*(dUP+dUT)/S Example: D0=41058 T0=32819 P0=10143 S=294 C=320 D1=42920 T1=29889 dUP = 42920-41058 =1862 dUT= (29*(29889-32819)/50-(29889-32819)^2/76666)*294/320=- 1664 P=10143+100*(1862-1664)/294=10210=1021.0hpa |
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