MSC121x用作高精度智能温度传感器

Contents
1 Temperature Sensing System   2
1.1 Temperature Sensor Circuit  . 3
1.2 Temperature Sensor Parameters  . 4
1.3 Ideal Diode Equation    5
2 Temperature Sensor Accuracy  . 6
2.1 Linear Curve Fitting    . 6
2.2 Polynomial Curve Fitting    7
3 Temperature Sensor Calibration Methods 8
3.1 Two Points Calibration   9
3.2 Three Points Calibration    9
3.3 No Calibration and One Point Calibration  10
3.3.1 Average Coefficient Values   10
3.3.2 One Point Calibration    11
3.3.3 Measurement Setups    11
4 Calibration Setups   . 11
4.1 Reference Sensor    . 11
4.2 Reference Sensor Measurements   12
4.3 Temperature Bath    . 12
4.4 Package Junction Temperature   13
5 Self-Heating Effect   . 13
6 Example Code. 14
References  . 15
Appendix A Sample Part Measurement Data 16
Appendix B Temperature.c Source Listing  17
List of Figures
Figure 1. MSC121x Intelligent Temperature Sensor  . 2
Figure 2. Block Diagram of Temperature Sensor  3
Figure 3. MSC Vtemp and Measurement Accuracy   7
Figure 4. Increasing Accuracy with Calibration Complexity  . 9
Figure 5. Slope and Intercept Coefficient Histograms for 6 Samples    . 10
Figure 6. Temperature Measurement Error for 6 Samples   10
Figure 7. RTD 5 Wires Configuration   . 12
Figure 8. Heating Effect from Clock Frequency Change 13
Figure 9. Self-Heating Effect from Power Supply Voltage Change. 13
List of Tables
Table 1. Diode Equation Parameters    4
Table 2. Temperature Sensor Slope and Intercept Coefficients 5
Table 3. Temperature Sensor Calibration Complexities vs. Precision    . 8
Table A−1. Sample Part Measurement Data  16