3.2. Guidelines: Using External Temperature Sensors
Intel recommends that you sample the temperature when the device is inactive or use the internal temperature sensor with the internal TSD.
You can use both internal and external temperature sensors simultaneously.
Board Connection Guidelines for the Traces to the External TSD Pins
- Keep the trace lengths to the TEMPDIODEP or TEMPDIODEN pins less than eight inches.
- Route both traces in parallel and place them close to each other with grounded guard tracks on each side.
- Intel recommends a 10-mils width and space for both traces.
- Route both traces through the most minimum number of vias and crossunders possible to minimize the thermocouple effects.
- Ensure that the number of vias for both traces are the same.
- Ensure that both traces are approximately the same length.
- To avoid coupling, insert a GND plane between the external TSD pins traces and high-frequency toggling signals, such as clocks and I/O signals.
- To filter high-frequency noise, place an external capacitor between the traces close to the external temperature sensing chip. For more details, refer to the third-party temperature sensing chip manufacturer design guidelines.
- If you use only the internal TSD, you can leave the TEMPDIODEP and TEMPDIODEN pins unconnected.
For details about device specifications and connection guidelines, refer to the external temperature sensor manufacturer's datasheet.
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