Multi-jack detector
AssigneeRealtek Semiconductor Corp.
InventorsMing-Jane Hsieh, Chuting Su, Yi-Shu Chang, Ming-Lih Lin
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Abstract
A multi-jack detector for detecting states of a plurality of jacks. Each jack comprises a first switch having a first normally closed terminal and a first output terminal. The multi-jack detector comprises a plurality of bias resistors each coupled to one of the first output terminals, respectively; a control unit for determining the states of the plurality of jacks; wherein the first normally closed terminals are commonly coupled to a first node and the control unit determines the states of the plurality of jacks according to a voltage at the first node. Because the voltage at the first node is different for each state of the jacks, the detector can detects the states of the jacks using a single I/O pin.
Claims13
A detector for detecting states of a plurality of jacks, each jack comprising a first switch having a first normally closed terminal and a first output terminal, and a second switch having a second normally closed terminal and a second output terminal, the detector comprising:
- a plurality of bias resistors each coupled to one of the first output terminals, respectively;
- a control unit for determining the states of the plurality of jacks;
- and
- a plurality of matching resistors each coupled to one of the second output terminals, respectively, so as to match with an output resistance of the first and the second switches of the plurality of jacks;
- wherein the first normally closed terminals are commonly coupled to a first node and the control unit determines the states of the plurality of jacks according to a voltage at the first node.
A detector for detecting states of a plurality of jacks, each jack comprising a first switch having a first normally closed terminal and a first output terminal and a second switch having a second normally closed terminal and a second output terminal, when there is no external terminal being inserted into a jack, the first normally closed terminal of the jack is coupled to the first output terminal of the jack and the second normally closed terminal of the jack is coupled to the second output terminal of the jack, and when there is an external terminal being inserted into the jack, the first normally closed terminal of the jack is not coupled to the first output terminal of the jack and the second normally closed terminal of the jack is not coupled to the second output terminal of the jack, the detector comprising:
- a plurality of bias resistors each coupled to one of the first output terminals, respectively;
- a control unit for determining the states of the plurality of jacks;
- and
- a plurality of matching resistors each coupled to one of the second output terminals, respectively, so as to match with an output resistance of the first and the second switches of the plurality of jacks;
- wherein the first normally closed terminals are commonly coupled to a first node and the control unit determines the states of the plurality of jacks according to a voltage at the first node.
The detector according to claim 10 further comprising:
- a pull-up resistor having a first terminal coupled to a power source, and a second terminal coupled to the first node.
Dependencies are inferred from the claim text.