OUTPUT CIRCUIT AND METHOD OF DETECTING WHETHER LOAD CONNECTED TO CONNECTING PORT AND RELATED VIDEO OUTPUT CIRCUIT

摘要

Described in example embodiments herein are techniques for detecting a connection between a load and a connecting port. In accordance with an example embodiment, an output circuit is able to detect a corresponding connecting port includes a voltage output stage, a reference current source and a determination circuit. The voltage output stage is arranged to output a voltage signal to an output end of the output circuit. The reference current source is arranged to selectively provide a first current to the output end. The determination circuit is arranged to generate a determination signal according to whether a second voltage signal is identical to a first voltage signal that is caused by the first current flowing into the output end. The determination signal indicates the load is connected to the connecting port when the second voltage signal is not identical to the first voltage signal.

主权项

1. An output circuit, comprising:
a voltage output stage, arranged to output a voltage signal to an output end of the output circuit, wherein the output end is coupled to a connecting port; a reference current source, coupled to the output end, arranged to selectively provide a first current to the output end; and a determination circuit, coupled to the output end, arranged to generate a determination signal according to whether a second voltage signal is identical to a first voltage signal that is caused by the first current flowing into the output end, wherein the determination signal indicates a load is connected to the connecting port when the second voltage signal is not identical to the first voltage signal.