Method for expanding earphone interface of mobile phone into serial communication interface

Abstract

The invention relates to a method for expanding the earphone interface of a mobile phone into a serial communication interface. The method involves an earphone connector, an earphone interface and a control circuit which is arranged on a main board of the mobile phone and is connected with the earphone interface. The method comprises the following steps: S1, making the uploading port and downloading port of the serial communication interface be able to function as the pins of the left channel and right channel of the earphone connector; S2, arranging an analogue switch on the main board of the mobile phone for switching the serial communication interface and the interface of the left and right channels; and S3, arranging an analog-to-digital conversion pin in a microphone audio circuit of the main board of the mobile phone for detecting the voltage when the earphones are plugged in. The method for expanding the earphone interface of the mobile phone into the serial communication interface of the embodiment of the invention increases the functions of the earphones of the mobile phone, and enables convenient serial communication. Meanwhile, the scheme is also applicable to other mobile phone platforms, and has high generality.

Description

technical field [0001] The invention relates to the field of mobile communication, and more specifically relates to a method for expanding the earphone interface of a mobile phone into a serial communication interface. Background technique [0002] At present, in China, the Mini 10pin USB interface is the mainstream of the mobile phone USB interface on the market, such as figure 1 As shown, the 10 pins include charging, data lines (D-, D+), serial lines (TX, RX) and audio interfaces (MIC, Speaker), etc. [0003] On June 30, 2009, the European Commission of the European Union stated that for environmental protection and consumer convenience, from January 1, 2010, the European mobile phone charger standard will uniformly adopt the standard Micro 5pin USB port (such as figure 2 ), these 5pins include charging, data lines (D-, D+), ID and GND. At the same time, the new Chinese standard requires mobile phone audio to use a 3.5mm headphone jack. However, the mobile phone also n...

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Problems solved by technology

The industry often meets this requirement by welding flying leads at test points. This method is not only complicated to operate, but also prone to defective products.

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