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 , wherein a first node of the sense resistor is coupled between the first pin and the second pin , a second node of the sense resistor is coupled to the third pin , and the second node of the sense resistor 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 is coupled to the drive circuit , the sense resistor 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 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 , in 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 , in 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 , wherein a first node of the sense resistor is coupled between the first pin and the second pin , a second node of the sense resistor is coupled to the third pin , and the second node of the sense resistor 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 is coupled to the drive circuit , the sense resistor 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 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 , in 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 , in 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 is coupled to the drive circuit , the sense resistor 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 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 , in 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 , in 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. <EOS>