Interface foreign matter detection circuit, charger and terminal equipment

Abstract

The invention discloses an interface foreign matter detection circuit, a charger and terminal equipment, and the circuit comprises a controller module which is used for judging whether equipment connected to an interface is downlink port equipment or not according to a configuration channel signal; an impedance detection module which is used for detecting whether the impedance to ground of the sideband use interface exceeds a preset value or not when the equipment is non-downlink port equipment, wherein if the impedance to ground of the sideband use interface exceeds the preset value, a first sideband use interface signal and a second sideband use interface signal are respectively generated through two preset impedance to ground detection circuits; and a processor module which is used for judging whether at least one low-level signal exists in the first sideband use interface signal and the second sideband use interface signal or not, if so, determining that a foreign matter exists in the interface, and generating a corresponding foreign matter detection signal. According to the invention, a humanized interface foreign matter detection scheme is realized, so that the interface can be cleaned immediately, the durability of the product is improved, and the user experience is enhanced.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to an interface foreign matter detection circuit, a charger and a terminal device. Background technique [0002] In the prior art, with the continuous development of intelligent terminal equipment and the popularity of the USB Type C interface, the plug can be inserted into the socket regardless of the front and back sides, which greatly facilitates people's daily plugging and unplugging operations, reflecting the advantages of the Type C interface. convenience. However, just because the Type C socket supports positive and negative plug recognition, the Type C USB interface is designed to identify the type and insertion of the plug device by designing the PIN pins of the two CC configuration channel signals on the two rows of the socket respectively. direction. Among them, since the Type C terminal can supply power to external devices, the DFP (Downstream Facing Port) downstrea...

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Problems solved by technology

[0004] Therefore, since there is always a working voltage on the CC signal of the USB socket, if there is water or other conductive liquids between this PIN pin and other adjacent PIN pins, for example, in the daily use environment, the mobile phone often encounters water vapor, sweat, Even raindrops and other adhesions, the metal contacts used to connect to the external Type C interface will be attacked by these sewage. Electrochemical corrosion will occur between the CC pin and other pins in the Type C interface due to the presence of voltage, resulting in CC signal There is a corrosion problem with the adjacent signal PIN, and as the corrosion intensifies, it will also cause a variety of abnormal functions that are difficult to find out due to contact problems in the USB socket

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