A configurable interface circuit supporting selectable operational modes, including modes for analog measurement and analog output on a configurable channel coupleable to at least one external field device, the interface circuit comprising: a first pin; a second pin; a third pin; a sense resistor (112, 212), wherein a first node of the sense resistor (112, 212) is coupled between the first pin and the second pin, a second node of the sense resistor (112, 212) is coupled to the third pin, and the second node of the sense resistor (112, 212) is also coupled to the at least one external field device; and an integrated circuit including: a configurable drive circuit coupled to the first pin and including a current mode of operation wherein the sense resistor (112, 212) is coupled to the drive circuit, the sense resistor (112, 212) to provide a current measurement element and a current control element; and a configurable measurement circuit coupled to the second pin and the third pin and configured to monitor a voltage drop across the sense resistor (112, 212) representative of a current forced through the configurable drive circuit by the at least one external field device coupled to the second node of the sense resistor (112, 212), in (112, 212) in a current-loop mode of operation, or a current provided by the configurable drive circuit to the at least one external field device coupled to the second node of the sense resistor (112, 212), in (112, 212) a current output mode of operation; and wherein the configurable drive circuit and the configurable measurement circuit define the configurable channel; and the at least one external field device is external to the integrated circuit. a first pin; a second pin; a third pin; a sense resistor (112, 212), wherein a first node of the sense resistor (112, 212) is coupled between the first pin and the second pin, a second node of the sense resistor (112, 212) is coupled to the third pin, and the second node of the sense resistor (112, 212) is also coupled to the at least one external field device; and an integrated circuit including: a configurable drive circuit coupled to the first pin and including a current mode of operation wherein the sense resistor (112, 212) is coupled to the drive circuit, the sense resistor (112, 212) to provide a current measurement element and a current control element; and a configurable measurement circuit coupled to the second pin and the third pin and configured to monitor a voltage drop across the sense resistor (112, 212) representative of a current forced through the configurable drive circuit by the at least one external field device coupled to the second node of the sense resistor (112, 212), in (112, 212) in a current-loop mode of operation, or a current provided by the configurable drive circuit to the at least one external field device coupled to the second node of the sense resistor (112, 212), in (112, 212) a current output mode of operation; and wherein the configurable drive circuit and the configurable measurement circuit define the configurable channel; and the at least one external field device is external to the integrated circuit. a configurable drive circuit coupled to the first pin and including a current mode of operation wherein the sense resistor (112, 212) is coupled to the drive circuit, the sense resistor (112, 212) to provide a current measurement element and a current control element; and a configurable measurement circuit coupled to the second pin and the third pin and configured to monitor a voltage drop across the sense resistor (112, 212) representative of a current forced through the configurable drive circuit by the at least one external field device coupled to the second node of the sense resistor (112, 212), in (112, 212) in a current-loop mode of operation, or a current provided by the configurable drive circuit to the at least one external field device coupled to the second node of the sense resistor (112, 212), in (112, 212) a current output mode of operation; and wherein the configurable drive circuit and the configurable measurement circuit define the configurable channel; and the at least one external field device is external to the integrated circuit.