It's a temp of the PCB or the hashboard and the ASIC chip itself has its own temp sensor.

You can use that link as your reference you can find the PCB temp under the miner status.
And this is the sample image below



Temp(PCB) this must be what you talking about. It has a 4 PCB temp sensor as you can see from the image above. Those sensors are under the heat sink look at the image below