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MS5534-BM Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers |
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10 / 21 page DA5534B_003.doc February 28th, 2005 10 00005534B784 ECN 711 Example: Word1, Word2, Word3 and Word4 (4x16 Bit) D1 = 17000 D2 = 22500 Start Convert calibration data into coefficients: (see bit pattern of Word1-Word4) Read calibration data (factory calibrated) from PROM of MS5534B Read digital pressure value from MS5534B D1 (16 Bit) Read digital temperature value from MS5534B Display pressure and temperature value Basic equations: Calculate calibration temperature UT1 = 8*C5+20224 Calculate temperature compensated pressure Difference between actual temperature and reference temperature: dT = D2 - UT1 Actual temperature: TEMP = 200 + dT*(C6+50)/210 (0.1°C resolution) Calculate actual temperature D2 (16 Bit) SENST1 OFFT1 TCS TCO Tref TEMPSENS C1: Pressure sensitivity (15 Bit) C2: Pressure offset (12 Bit) C3: Temperature coefficient of pressure sensitivity (10 Bit) C4: Temperature coefficient of pressure offset (10 Bit) C5: Reference temperature (11 Bit) C6: Temperature coefficient of the temperature (6 Bit) Word1 = 50426 Word2 = 9504 Word3 = 48029 Word4 = 55028 C1 = 25213 C2 = 1908 C3 = 859 C4 = 750 C5 = 148 C6 = 32 dT(D2) = D2 - Tref TEMP(D2) = 20°+dT(D2)*TEMPSENS Offset at actual temperature: OFF = C2*4 + ((C4-512)*dT)/212 Sensitivity at actual temperature: SENS = C1 + (C3*dT)/210 + 24576 X = (SENS * (D1-7168))/214 - OFF Temperature compensated pressure: P = X*10/25 + 250*10 (0.1mbar resolution) OFF(D2) = OFFT1+TCO*dT(D2) SENS(D2) = SENST1+TCS*dT(D2) P(D1,D2) = D1*SENS(D2)-OFF(D2) dT = 1092 TEMP = 287 = 28.7 °C OFF = 7695 SENS = 50705 X = 22732 P = 9603 = 960.3 mbar Fig. 3: Flow chart for pressure and temperature reading and software compensation. NOTES 1) Readings of D2 can be done less frequently, but the display will be less stable in this case. 2) For a stable display of 0.1 mbar resolution, it is recommended to display the average of 8 subsequent pressure values. |
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