SIM card detection device and method and customer front-end equipment

Abstract

The invention discloses an SIM card detection device and method and client front-end equipment, and the device comprises a capacitance sensing element which is electrically connected with the input end of a capacitance digital converter, and is used for carrying out the proximity detection of an SIM card, so as to obtain the changed capacitance according to the proximity degree; the capacitance-to-digital converter is used for converting the capacitance into a digital detection result and outputting the digital detection result to the processor; and the processor is used for converting the digital detection result into an equivalent capacitance value and comparing the equivalent capacitance value with a preset capacitance threshold value so as to determine whether the SIM card is inserted into the SIM card seat or not. Whether the SIM card is inserted into the SIM card seat or not is detected according to the principle of the capacitive sensor, no metal elastic piece is needed for detection of the SIM card, the SIM card is detected in a non-contact mode, the problem of misjudgment of SIM card detection is avoided, and the space in the SIM card seat is saved.

Description

technical field [0001] This application relates to, but is not limited to, electronic technology, especially a SIM card detection device and method and customer pre-installation equipment. Background technique [0002] For an electronic device that can set a Subscriber Identity Module (SIM), that is, a SIM card, in order to detect whether the SIM card is inserted, an additional pin that is electrically connected to the metal shrapnel is usually added to the SIM card holder. The pin is connected with the general purpose input / output (GPIO, General Purpose Input / Output) interface of the central processing unit, and is used to realize the detection of SIM card insertion. [0003] figure 1 It is a functional schematic diagram of realizing SIM card detection in the related art, such as figure 1 As shown, when the SIM card is not inserted into the card holder, the GPIO interface is connected to a resistor Rp and pulled up to VLDO to make the GPIO interface high; when the SIM car...

AI Technical Summary

Problems solved by technology

On the one hand, the metal shrapnel is a volatile device, which requires strict tolerances for its production and high durability requirements for long-term plugging and unplugging. It is also required that no large deformation occurs after long-term plugging and unplugging, otherwise it will cause SIM card detection failure. ; On the other hand, the mechanical contact of the metal shrapnel is limited by the influence of the contact point. If there is foreign matter during the period, the metal shrapnel can easily fail to contact the contact point, which will cause the SIM card detection to fail; moreover, the size of the metal shrapnel Relatively small, and set inside the SIM card holder, the production cost is high

That is to say, using metal shrapnel to achieve mechanical contact to achieve SIM card detection is prone to the problem of SIM card detection misjudgment

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