| 摘要 |
<p>The present invention provides an earphone interface and GPIO interface multiplexing circuit structure. A host baseband or a host audio codec comprises a low-dropout linear voltage stabilizer, a programmable gain amplifier, a first power amplifier, a second power amplifier, and a grounding terminal. An output end of the low-dropout linear voltage stabilizer, an input end of the programmable gain amplifier, and a first universal input/output interface are connected in parallel and then connected to a microphone interface. The grounding terminal of the host baseband is connected to a grounding interface. An output end of the first power amplifier and a second universal input/output interface are connected in parallel and then connected to a left-channel earphone interface. An output end of the second power amplifier and a third universal input/output interface are connected in parallel and then connected to a right-channel earphone interface. The earphone interface and GPIO interface multiplexing circuit structure of the present invention can implement the connection between a host and an earphone device, and further implement the connection between the host and a data interface device, thereby extending the functions of the earphone interface.</p> |
