Accessory interface electrostatic protection circuit and equipment

Abstract

The invention relates to an accessory interface electrostatic protection circuit and equipment. The protection circuit comprises an accessory interface. The protection circuit also comprises a detection circuit, a control circuit and a switching circuit; the detection circuit is connected with the accessory interface and outputs a detection signal according to the access condition of the accessoryinterface; the control circuit is connected with the detection circuit and outputs a switching instruction according to the detection signal; the switching circuit is connected with the accessory interface and used for switching the accessory interface to be connected with a first link or a second link, wherein the second link comprises a discharging circuit; and the switching circuit is connected with the control circuit and switches the accessory interface to be connected with the second link according to the switching instruction so as to realize an electrostatic protection function. Withthe accessory interface electrostatic protection circuit of the invention adopted, the problem that the normal use of the equipment is influenced by electrostatic interference when the accessory interface is exposed can be solved under the conditions of not influencing the existing use mode of the accessory interface and not introducing other adverse effects. The probability of equipment abnormality caused by static electricity can be effectively reduced, and user experience is improved. The accessory interface electrostatic protection circuit is simple, low in cost and high in reliability.

Description

technical field [0001] The invention relates to the field of static electricity protection, and more specifically relates to an accessory interface static electricity protection circuit and equipment. Background technique [0002] Among many electronic devices, the communication signal interface of its accessories is usually exposed, which is very susceptible to static interference. Especially in today's handheld devices due to ID requirements, structurally speaking, the interface is more exposed to the air, and the distance from the interface to the main control chip is longer, so it is more susceptible to electrostatic interference. When the electrostatic interference is serious, it will cause abnormalities such as crash, black screen, and restart of the handheld device. Conventional means, such as adding TVS tubes, etc., cannot achieve a high level of electrostatic protection, and will affect the quality of the input and output signals of the interface, especially in the...

AI Technical Summary

Problems solved by technology

[0002] Among many electronic devices, the communication signal interface of its accessories is usually exposed, which is very susceptible to electrostatic interference

Especially in today's handheld devices due to ID requirements, structurally speaking, the interface is more exposed to the air, and the distance from the interface to the main control chip is longer, so it is more susceptible to electrostatic interference

When the electrostatic interference is serious, it will cause abnormalities such as crash, black screen, restart, etc.

Conventional means, such as adding TVS tubes, etc., cannot achieve a high level of electrostatic protection, and will affect the quality of the input and output signals of the interface. Especially in the case of high speed, the added ESD device will affect the eye diagram of some signal lines quality

However, conventional methods such as filtering have a greater impact on the signal and are difficult to use in this application

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