Detection circuit
AssigneeHigh Tech Computer, Corp.
InventorsYu-Chun Peng, Ching-Sung Ho, Su-Hong Tseng, Hsi-Cheng Yeh
Life of this patent
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Abstract
A plug detection circuit. The detected circuit is disposed in an electronics device with an earphone jack, accepting plugs with a plurality of conductive rings. The detection circuit has a plurality of pins, wherein a first pin detects, and outputs a first logic potential, and a second pin detects the potentials at the conductive rings and outputs a second logic potential. The detection circuit determines the type of earphone connected to the earphone jack.
Claims4
A plug detection circuit, disposed in a electronics device with an earphone jack, wherein the eat-phone jack has at least a first pin, a second pin and a third pin, the detection circuit comprising:
- a first resistor electrically coupled to a voltage source and the first pin respectively;
- a second resistor electrically coupled to the first pin;
- a first capacitor having one end electrically coupled to a first output terminal with the second resistor, and the other end coupled to ground, wherein the potential at the first output terminal is a first logic potential;
- a third resistor having one end electrically coupled to the third pin;
- a fourth resistor electrically coupled to the voltage source and the second pin respectively;
- a fifth resistor having one end electrically coupled to the second pin;
- a second capacitor having one end electrically coupled to the fifth resistor, and the other end coupled to ground;
- a sixth resistor having one end electrically coupled to the voltage source;
- and
- a switch having one end electrically coupled to the sixth resistor, and the other end coupled to ground, wherein the switch further has a control terminal electrically coupled to a second output terminal with the second capacitor and the fifth resistor, and the potential at the second output terminal is a second logic potential.
Dependencies are inferred from the claim text.