| 主权项 |
1. A coil detection circuit, adapted to the electromagnetic input device comprising a plurality of first loop coils, a plurality of second loop coils, a first multiplex unit and a second multiplex unit, the first multiplex unit being coupled to the first loop coils, the second multiplex unit being coupled to the second loop coils, and the coil detection circuit comprising:
a selection unit, coupled to the first multiplex unit and the second multiplex unit; a first detection unit, coupled to the first multiplex unit; and a second detection unit, coupled to the second multiplex unit; when the selection unit selects one of the first loop coils to emit a first electromagnetic signal to each one of the second loop coils, each one of the second loop coils forms a second closed loop for receiving the first electromagnetic signal, and the second detection unit detects a second signal; when one of the second loop coils does not form the second closed loop, the second detection unit detects an open-circuit signal; when one of the second loop coils forms a short circuit, the second detection unit detects a short-circuit signal; when the selection unit selects one of the second loop coils to emit a second electromagnetic signal to each one of the first loop coils, each one of the first loop coils forms a first closed loop for receiving the second electromagnetic signal, and the first detection unit detects a first signal; when one of the first loop coils does not form the first closed loop, the first detection unit detects the open-circuit signal; when one of the first loop coils forms a short circuit, the first detection unit detects the short-circuit signal. |
