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MS5536 Datasheet(PDF) 8 Page - Intersema Sensoric SA |
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MS5536 Datasheet(HTML) 8 Page - Intersema Sensoric SA |
8 / 14 page DA5536_009.doc 00005536589 ECN925 May 03, 2007 8 C3/II (8-Bit) C5/II(8-Bit) Word 1 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 C4/II (8-Bit) C6(8-Bit) Word 2 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 C5/I (4-Bit) C1/II (12-Bit) Word 3 DB11 DB10 DB9 DB8 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 C1/I C4/I C3/I C2 (13-Bit) Word 4 DB12 DB8 DB8 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Fig. 4: Arrangement (Bit-pattern) of calibration data in Word1 to Word4. SECOND-ORDER TEMPERATURE COMPENSATION In order to obtain full accuracy over the whole temperature range, it is recommended to compensate for the non-linearity of the output of the temperature sensor. This can be achieved by the second-order temperature calculation, i.e. by replacing the block ‘Calculate actual temperature’ in flow chart Fig. 3 by the following sequence: Calculate actual temperature Difference between the actual temperature and reference temperature: dT = (D2 - UT1) - ((D2-UT1)*(D2-UT1))/2 18 Actual temperature in °C TEMP = 2000 + dT*(C6+262)/2 9 (weight: 0.01°C) Calculate actual temperature Difference between the actual temperature and reference temperature: dT = (D2 - UT1) - (9*(D2-UT1)*(D2-UT1))/2 18 Actual temperature in °C TEMP = 2000 + dT*(C6+262)/2 9 (weight: 0.01°C) D2≥UT1? no yes Fig. 5: Flow chart for calculating the temperature to the optimum accuracy. The value for dT thus obtained is then used for the calculation of the temperature compensated pressure as shown in Fig. 3. |
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