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CY8CKIT-025 PSoC® Precision Analog Temperature Sensor Expansion Board Kit Guide, Doc. # 001-65791 Rev. *J 57
Example Projects
The 10 mV reading should typically be within ± 200 µV of the actual value. The ADC gain error is the
main factor driving this error and PSoC 3 ADC with a maximum gain error of 0.2 percent keeps the
measurement inaccuracy to <100 µV.
5.3.2.4.3 RTD
RTD temperature is simulated with a potentiometer, similar to the testing for the tempsense project.
Following are the test results.
5.3.2.4.4 Diode
The diode is typically within ± 2°C. See the description in Expected Performance and Test Results on
page 36 to understand more about the expected error and thermal considerations. Table 5-9 pro-
vides an example of measured temperature. A standard thermometer with ±1 °C accuracy is used
for comparison.
5.3.2.4.5 DS600 IC Temperature Sensor
The DS600 typically is within ± 0.5°C. Table 5-10 provides an example of measured temperature. A
standard thermometer with ±1 °C accuracy is used for comparison. Note that as mentioned in
DS600 IC Sensor on page 39 , the IC measures the pad temperature below it and the IC signal chain
is accurate, as shown in Table 5-7 on page 39 .
Table 5-8. RTD Test Results
Actual Temp(°C) Measured Temp(°C) Difference(°C)
76.60 76.64 –0.04
37.14 37.06 0.08
20.44 20.5 –0.06
0.13 0.03 0.10
–19.73 –19.77 0.04
–45.76 –45.82 0.06
Table 5-9. Diode Test Results
Actual Temp (°C) Measured Temp (°C) Difference (°C)
0.8 1.2 0.4
6.2 5.6 –0.6
17 16.1 –0.9
22 21 –1
30 29.3 –0.7
75.3 74.7 –0.6
99.5 99.4 –0.1
Table 5-10. DS600 IC Temperature Sensor Test Results
Actual Temp (°C) Measured Temp (°C) Difference (°C)
39.9 39.5 0.42
20.1 19.8 0.26
0.8 0.4 0.36
–19.7 –20.0 0.31
–39.4 –39.8 0.40