Electronic Device Charging Via an Audio Jack

摘要

An electronic device may comprise audio processing circuitry and a first connector having a first contact and a second contact. In a first mode of operation, the audio processing circuitry is configured to output one or more audio signals carrying music and/or voice via the first contact and the second contact. In a second mode of operation, the audio processing circuitry is configured to output a signal for delivering supply current via the first contact and the second contact. While the electronic device is in the first mode of operation, a gain and/or volume limit of the audio processing circuitry may be set to a first level, and while the electronic device is in the second mode of operation, the gain and/or volume limit of the audio processing circuitry may be set to a second level that is higher than the first level.

主权项

1. A system comprising:
an electronic device comprising audio processing circuitry and comprising a first connector having a first contact and a second contact, wherein:
in a first mode of operation, said audio processing circuitry is configured to output one or more audio signals carrying music and/or voice via said first contact and said second contact; andin a second mode of operation, said audio processing circuitry is configured to output a signal for delivering supply current via said first contact and said second contact;said electronic device comprises circuitry operable to:
sense whether a device connected to said first contact and said second contact is capable of receiving supply current via said first contact and said second contact; anddetermine whether to transition to said first mode of operation based on an amount of current output by said audio processing circuitry.