Remote temperature sensor circuit and method

An integrated circuit (IC) comprising:

• a control circuit comprising:
• a current source configured to output a current;
• a voltage sensing circuit comprising an analog-to-digital converter (ADC) configured to output a signal;
• and
• a switching circuit coupled to the current source and to an input terminal of the voltage sensing circuit;
• a plurality of temperature sensing devices (TSDs), wherein each TSD of the plurality of TSDs comprises:
• a first TSD terminal and a second TSD terminal;
• a resistive device coupled between the first and second TSD terminals;
• and
• a switching device coupled between the first and second TSD terminals;
• and
• a plurality of current paths, wherein each current path of the plurality of current paths comprises a first end coupled to the first TSD terminal of a corresponding TSD of the plurality of TSDs and a second end coupled to the switching circuit,
• wherein the control circuit is configured to output the signal from the ADC based on, for each TSD of the plurality of TSDs:
• a first voltage level output from the switching circuit concurrently with the corresponding current path of the plurality of current paths conducting the current and the corresponding switching device being in an open state, and
• a second voltage level output from the switching circuit concurrently with the corresponding current path of the plurality of current paths conducting the current and the corresponding switching device being in a closed state.

A method of operating a circuit, the method comprising:

• using a switching circuit to conduct a current through a current path in series with a resistive device concurrently with detecting a first voltage level at a first node of the switching circuit coupled to the current path;
• using the switching circuit to conduct the current through the current path in series with a switching device parallel to the resistive device concurrently with detecting a second voltage level at a second node of the switching circuit coupled to the current path;
• and
• outputting a signal from a voltage sensing circuit based on the first voltage level and the second voltage level.