| 摘要 |
A method, device, and electronic signature tool for use in matching with an audio interface of a mobile terminal. The method comprises: connecting a third pin of the audio interface to a first pin of the audio interface via a first circuit, where the first circuit comprises a first unidirectional conduction module, and where the current of the first unidirectional conduction module flows in the direction towards the first pin; connecting the third pin to a second pin of the audio interface via a second circuit, where the second circuit comprises a second unidirectional conduction module, and where the current of the second unidirectional conduction module flows in the direction towards the second pin; controlling the first unidirectional conduction module to be conducted, thereby allowing the third pin and the first pin to form a loop, where the impedance value of the loop matches with an identification resistor of the mobile terminal; and, controlling the second unidirectional conduction module to be conducted, thereby allowing the third pin and the second pin to form a loop, where the impedance value of the loop matches with the identification resistor of the mobile terminal. This allows the impedance of the loop of an audio output pin and ground pin of the audio interface to match with the identification resistor of the mobile terminal. |
