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Contents1 Temperature Sensing System 21.1 Temperature Sensor Circuit . 31.2 Temperature Sensor Parameters . 41.3 Ideal Diode Equation 52 Temperature Sensor Accuracy . 62.1 Linear Curve Fitting . 62.2 Polynomial Curve Fitting 73 Temperature Sensor Calibration Methods 83.1 Two Points Calibration 93.2 Three Points Calibration 93.3 No Calibration and One Point Calibration 103.3.1 Average Coefficient Values 103.3.2 One Point Calibration 113.3.3 Measurement Setups 114 Calibration Setups . 114.1 Reference Sensor . 114.2 Reference Sensor Measurements 124.3 Temperature Bath . 124.4 Package Junction Temperature 135 Self-Heating Effect . 136 Example Code. 14References . 15Appendix A Sample Part Measurement Data 16Appendix B Temperature.c Source Listing 17List of FiguresFigure 1. MSC121x Intelligent Temperature Sensor . 2Figure 2. Block Diagram of Temperature Sensor 3Figure 3. MSC Vtemp and Measurement Accuracy 7Figure 4. Increasing Accuracy with Calibration Complexity . 9Figure 5. Slope and Intercept Coefficient Histograms for 6 Samples . 10Figure 6. Temperature Measurement Error for 6 Samples 10Figure 7. RTD 5 Wires Configuration . 12Figure 8. Heating Effect from Clock Frequency Change 13Figure 9. Self-Heating Effect from Power Supply Voltage Change. 13List of TablesTable 1. Diode Equation Parameters 4Table 2. Temperature Sensor Slope and Intercept Coefficients 5Table 3. Temperature Sensor Calibration Complexities vs. Precision . 8Table A−1. Sample Part Measurement Data 16
