User Manual Q&AAnswer
May 03, 2025 - 12:51 AM
When selecting a temperature sensing chip for your application, there are several factors to consider. The Intel AN 769 FPGA Remote Temperature Sensing Diode User Guide provides guidelines for selecting the most appropriate chip. Here are some key considerations:
1. Temperature Accuracy: Determine the temperature accuracy you want to achieve in your application. Different temperature sensing chips have different accuracy levels, so choose a chip that meets your requirements.
2. Ideality Factor Mismatch: The ideality factor is a parameter that measures the deviation of the diode from its ideal behavior. Select a temperature sensing chip that features a configurable ideality factor, which allows you to eliminate the mismatch error and improve accuracy.
3. Series Resistance Error: The series resistance on the P and N pins can contribute to temperature measurement error. Look for a temperature sensing chip that has a built-in series resistance cancellation feature to eliminate this error.
4. Temperature Diode Beta Variation: As the temperature diode Beta value decreases, it can affect the current ratio and accuracy of temperature measurements. Choose a chip that has built-in Beta compensation to maintain accurate current ratios.
5. Differential Input Capacitor: The capacitor on the P and N pins acts as a low-pass filter to filter high-frequency noise and improve electromagnetic interference. Refer to the temperature sensing chip manufacturer's data sheet for recommended capacitance values.
6. Offset Compensation: Multiple factors can contribute to measurement error. Consider using a temperature sensing chip with built-in offset compensation to eliminate calculated errors. Perform a temperature profile study to determine the offset value to apply.
By considering these factors and referring to the guidelines in the user guide, you can select the most appropriate temperature sensing chip for your application to achieve accurate temperature measurements.
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