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325541009-00 Datasheet(PDF) 11 Page - TE Connectivity Ltd |
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325541009-00 Datasheet(HTML) 11 Page - TE Connectivity Ltd |
11 / 21 page MS5541-30C Miniature 14 bar Module SENSOR SOLUTIONS ///MS5541C 09/2015 Page 11 Example: Word1, Word2, Word3 and Word4 (4x16 Bit) D1 = 17788 D2 = 26603 Start Convert calibration data into coefficients: (see bit pattern of Word1-Word4) Read calibration data (factory calibrated) from PROM of MS5541C Read digital pressure value from MS5541C D1 (16 Bit) Read digital temperature value from MS5541C Display pressure and temperature value Basic equations: Calculate calibration temperature UT1=8*C5+10000 Calculate temperature compensated pressure Difference between actual temperature and reference temperature: dT = D2 - UT1 Actual temperature: TEMP = 200 + dT*(C6+100)/2 11 (0.1°C) resolution) Calculate actual temperature D2 (16 Bit) SENST1 OFFT1 TCS TCO Tref TEMPSENS C1: Pressure sensitivity (13 Bit) C2: Pressure offset (13 Bit) C3: Temperature coefficient of pressure sensitivity (10 Bit) C4: Temperature coefficient of pressure offset (9 Bit) C5: Reference Temperature (12 Bit) C6: Temperature coefficient of the temperature (7 Bit) (Refer to application note AN518 for limits of coefficients and calculated results) Word1 = 18556 Word2 = 49183 Word3 = 22354 Word4 = 28083 C1 = 2319 C2 = 4864 C3 = 349 C4 = 219 C5 = 2002 C6 = 51 dT(D2) = D2 - Tref TEMP(D2)=20°+dT(D2)*TEMPSENS Offset at actual temperature: OFF = C2 + ((C4-250)*dT)/2 12 + 10000 Sensitivity at actual temperature: SENS = C1/2 + ((C3+200)*dT)/2 13 + 3000 Temperature compensated pressure in mbar: P = (SENS * (D1-OFF))/2 12 + 1000 OFF(D2)=OFFT1+TCO*dT(D2) SENS(D2)=SENST1+TCS*dT(D2) P(D1,D2)=D1*SENS(D2)-OFF(D2) dT = 587 TEMP = 243 = 24.3 °C OFF = 14859 SENS = 4198 P = 4001 = 4001 mbar UT1 = 26016 Fig. 3: Flow chart for pressure and temperature reading and software compensation |
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