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US 8,831,234 B2Granted
Audio jack detection and configuration
AssigneeFairchild Semiconductor Corporation
InventorsJohn R. Turner, Seth M. Prentice, Oscar Freitas, Wonsoo Moon
Life of this patent
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Abstract
This document discusses, among other things, an audio jack detection circuit configured to be coupled to an audio jack receptacle of an external device. The audio jack detection circuit configured to receive to receive audio jack receptacle information, to disable an oscillator when the audio jack receptacle information indicates that the audio jack receptacle is empty, and to enable the oscillator when the audio jack receptacle information indicates that the audio jack receptacle includes an audio jack.
Claims27
An apparatus comprising:
- an audio jack detection circuit configured to be coupled to an audio jack receptacle, the audio jack detection circuit including:
- an oscillator;
- a comparator having a first input configured to be coupled to a microphone connection of the audio jack receptacle and to a microphone bias, wherein the comparator is configured to determine if the microphone connection of the audio jack receptacle is grounded using the microphone connection of the audio jack receptacle and the microphone bias;
- and
- digital logic configured to receive a clock signal from the oscillator and to determine a type of audio jack in the audio jack receptacle using the comparator;
- and
- wherein the audio jack detection circuit is configured to receive audio jack receptacle information, to disable the oscillator when the audio jack receptacle information indicates that the audio jack receptacle is empty, and to enable the oscillator when the audio jack receptacle information indicates that the audio jack receptacle includes an audio jack.
4 more elements
A method comprising:
- receiving audio jack receptacle information at an audio jack detection circuit;
- determining if a microphone connection of the audio jack receptacle is grounded using a comparator and a microphone bias;
- disabling an oscillator when the audio jack receptacle information indicates that the audio jack receptacle is empty;
- and
- enabling the oscillator and determining a type of audio jack in the audio jack receptacle, using digital logic configured to receive a clock signal from the oscillator, when the audio jack receptacle information indicates that the audio jack receptacle includes an audio jack, wherein the determining the type of audio jack in the audio jack receptacle includes using the comparator.
2 more elements
A system comprising:
- a processor,
- an audio jack detection circuit coupled to the processor,
- an audio jack receptacle coupled to the audio jack detection circuit, the audio jack receptacle configured to receive an audio jack from an external device;
- and
- wherein the audio jack detection circuit includes:
- an oscillator;
- a comparator having a first input configured to be coupled to a microphone connection of the audio jack receptacle and to a microphone bias, wherein the comparator is configured to determine if the microphone connection of the audio jack receptacle is grounded using the microphone connection of the audio jack receptacle and the microphone bias;
- and
- digital logic configured to receive a clock signal from the oscillator and to determine a type of audio jack in the audio jack receptacle using the comparator;
- and
- wherein the audio jack detection circuit is configured to receive audio jack receptacle information, to disable the oscillator when the audio jack receptacle information indicates that the audio jack receptacle is empty, and to enable the oscillator when the audio jack receptacle information indicates that the audio jack receptacle includes an audio jack.
8 more elements
Dependencies are inferred from the claim text.