An inductance-to-digital conversion, IDC, circuit (30, 300) operable in an inductive position sensing system with multiple resonant sensors (20, 21, 22, 23), configured in a series-loop topology, each resonant sensor adapted to sense target position as a position of a respective conductive target within a sensing range relative to the resonant sensor, each resonant sensor including a resonator configured for a resonant frequency state having a steady-state oscillation amplitude and a resonator frequency, and a sensing range, and configured for operation at a nominal resonant frequency state in which the target for the resonant sensor is outside its sensing range, the resonator configured so that the nominal resonant frequency state is unique relative to a nominal resonant frequency state of any other resonant sensor, and a target-sensing resonant frequency state that corresponds to a target-sensing resonant sensor in a target-sensing condition in which its respective target is at a target position within its sensing range, the resonator configured so that the target-sensing resonant frequency state does not overlap with any target-sensing resonant frequency state of any other resonant sensor in a respective target-sensing condition, the IDC circuit comprising: a single channel interface couplable to the multiple resonant sensors in a series loop; resonance control circuitry configured to control system resonance state in response to a resonance control signal, including a target-sensing system resonance state in response to a target-sensing condition at a resonant sensor; IDC loop control circuitry configured to generate the resonance control signal, including a target-sensing resonance control signal corresponding to the target-sensing system resonance state for the target-sensing condition; the resonance control circuitry and the IDC loop control circuitry establishing an IDC control loop, the IDC control loop operable to drive a system resonance state in which each resonant sensor is driven to a resonant frequency state, including a nominal system resonance state in which each resonant sensor is driven to its nominal resonant frequency state, and including a target-sensing system resonance state in which at least one resonant sensor is driven to a target-sensing resonant frequency state associated with a target-sensing condition; the resonance control circuitry responsive to the target-sensing resonance control signal to drive the system resonance state to the target-sensing system resonance state, with the resonant sensor operating at the target-sensing resonant frequency state corresponding to the target-sensing condition; and sensor data output circuitry configured to output sensor data corresponding to the target-sensing resonance control signal, such that the output sensor data is representative of the target-sensing condition for the respective resonant sensor, differentiated from any target-sensing condition for another resonant sensor, and is accordingly representative of the target position of the respective target relative to such resonant sensor. a single channel interface couplable to the multiple resonant sensors in a series loop; resonance control circuitry configured to control system resonance state in response to a resonance control signal, including a target-sensing system resonance state in response to a target-sensing condition at a resonant sensor; IDC loop control circuitry configured to generate the resonance control signal, including a target-sensing resonance control signal corresponding to the target-sensing system resonance state for the target-sensing condition; the resonance control circuitry and the IDC loop control circuitry establishing an IDC control loop, the IDC control loop operable to drive a system resonance state in which each resonant sensor is driven to a resonant frequency state, including a nominal system resonance state in which each resonant sensor is driven to its nominal resonant frequency state, and including a target-sensing system resonance state in which at least one resonant sensor is driven to a target-sensing resonant frequency state associated with a target-sensing condition; the resonance control circuitry responsive to the target-sensing resonance control signal to drive the system resonance state to the target-sensing system resonance state, with the resonant sensor operating at the target-sensing resonant frequency state corresponding to the target-sensing condition; and sensor data output circuitry configured to output sensor data corresponding to the target-sensing resonance control signal, such that the output sensor data is representative of the target-sensing condition for the respective resonant sensor, differentiated from any target-sensing condition for another resonant sensor, and is accordingly representative of the target position of the respective target relative to such resonant sensor.