Mobile terminal with a calling misoperation preventive function

Abstract

The invention discloses a mobile terminal with a calling misoperation preventive function. The mobile terminal comprises an earphone plug. A pin 1 of the earphone plug is connected with a microphone signal control end of the earphone plug, a pin 2 of the earphone plug is grounded, a pin 3 of the earphone plug is connected with a right-sound-track signal control end of the earphone plug, a pin 4 of the earphone plug is connected with a left-sound-track signal control end, a pin 5 of the earphone plug is connected with a signal blocking control end of the earphone plug, and a pin 6 of the earphone plug is grounded through a pull-down resistor. The pin 5 and the pin 6 are switch control pins of the earphone plug, and a pin 6 is provided with a metal spring piece arranged on one side of the pin 5. The metal spring piece and the pin 5 are disconnected to control an analog switch before an earphone is pulled out and microphone signal are in short-circuit connection with ground signals, so that the microphone signal control end and an earphone calling button sensing end are disconnected. The earphone calling button sensing end is kept in high level, and accordingly, an earphone receiving / hanging-off button cannot be triggered to send commands, and calling misoperation is avoided.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a mobile terminal for preventing call misoperation. Background technique [0002] As a portable mobile terminal, the mobile phone brings convenience and entertainment to people's life and work. As mobile phones become more and more popular, in order to improve user experience requirements and obtain a large market, mobile phones are constantly developing towards miniaturization, ultra-thinning, and multi-functional trends, and their degree of personalization is also intensifying. Such trends all require more functions to be integrated in a smaller volume, which imposes higher requirements on the hardware and structure of mobile phones. [0003] Most of the current mobile phones use 3.5mm earphones. Since the size of the 3.5mm earphone jacks that match them is getting smaller and smaller, the distance between the ground signal and the shrapnel of the microphone signal is t...

AI Technical Summary

Problems solved by technology

During the detection process of the earphone, the input voltage of the power supply input terminal VDD is 2.8V. When the earphone is not inserted, the interrupt signal input by the interrupt signal control terminal is pulled up by the pull-up resistor R1, and the interrupt signal is kept at a high level at ordinary times; When the earphone is plugged in, the right channel signal control terminal is conducted to the ground through the speaker with a resistance value of 32 ohms (not shown in the figure) on the earphone, and the interrupt signal changes from high level to low level. A DC component is added to the audio signal of the earphone, resulting in a decrease in sound quality, and the pull-up resistor R1 will cause a small amount of leakage, resulting in unnecessary power consumption. It can be seen that the design of the headphone socket in the prior art will shorten the standby time of the mobile phone regardless of whether the earphone is plugged in or not. time

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