5. Conclusion
There are many different temperature sensing chip manufacturers. During component selection, Altera strongly recommends that you select the temperature sensing chip with the following considerations.
- Select a chip with configurable ideality factor feature.
- Select a chip that has series resistance cancellation.
- Select a chip that supports Beta compensation.
- Select capacitors that matches the chip manufacturer's recommendations.
- Apply any appropriate compensation after performing a temperature profile study.
Based on the implementation consideration and evaluation results, you must optimize the temperature sensing chip in your design to achieve measurement accuracy.
Note: The characteristics of the remote temperature sensing diode change when the FPGA is powered up versus powered down. Altera recommends recalibrating the temperature readings if continuous temperature readout is performed across FPGA power-up and power-down states.