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Circuit for protecting USB interface of terminal chip

A USB interface and terminal chip technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., can solve terminal chip burnout, user inconvenience and trouble, and terminal failure And other problems, to achieve the effect of protecting the USB charging function

Active Publication Date: 2017-06-23
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under abnormal circumstances, the USB ID pin of the USB socket may input a voltage exceeding the maximum withstand voltage of the pin due to a short circuit (such as a short circuit with the charging pin), resulting in burning the USB ID pin
After the USB ID pin is burned out, the AP chip cannot judge whether the terminal is a peripheral, which affects the charging function of the USB interface.
[0006] Therefore, in the actual use process, the USB ID pin of the terminal chip often burns out and the terminal cannot be charged through the USB port, which brings great inconvenience and trouble to the user.

Method used

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  • Circuit for protecting USB interface of terminal chip
  • Circuit for protecting USB interface of terminal chip
  • Circuit for protecting USB interface of terminal chip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 2 As shown, the embodiment of the present invention provides a circuit for protecting the USB interface of the terminal chip, the first resistor R0 and the first diode D0 are connected between the USB ID pin of the terminal chip and the power supply VDD, and the first The first end of a resistor R0 and the anode of the first diode D0 are both connected to the USB ID pin of the terminal chip, and the second end of the first resistor R0 is connected to the first diode D0 The negative poles of both are connected to the power supply VDD, which is characterized in that it includes:

[0022] A second resistor R1 is connected between the USB ID pin of the terminal chip and the USB ID pin of the terminal USB socket;

[0023] Wherein, the resistance value of the second resistor R1 satisfies the following conditions:

[0024]

[0025] Among them, V in is the input voltage of the USB ID pin of the USB receptacle, V max is the maximum withstand voltage of the...

Embodiment 2

[0054] Such as image 3 As shown, the embodiment of the present invention provides a circuit for protecting the USB interface of the terminal chip, the first resistor R0 and the first diode D0 are connected between the USB ID pin of the terminal chip and the power supply VDD, and the first The first end of a resistor R0 and the anode of the first diode D0 are both connected to the USB ID pin of the terminal chip, and the second end of the first resistor R0 is connected to the first diode D0 The negative poles of both are connected to the power supply VDD, which is characterized in that it includes:

[0055] A second resistor R1 or a second diode D1 is connected between the USB ID pin of the terminal chip and the USB ID pin of the terminal USB socket;

[0056] Wherein, the forward conduction voltage drop of the second diode D1 does not exceed the low-level threshold of the terminal chip.

[0057] Such as image 3 As shown, when the terminal’s USB socket is connected to the m...

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PUM

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Abstract

The invention discloses a circuit for protecting a USB interface of a terminal chip. A first resistor R0 and a first diode D0 are connected between USB ID pin of the terminal chip and a power supply VDD, the first end of the first resistor R0 and the positive electrode of the first diode D0 are connected with the USB ID pin of the terminal chip, the second end of the first resistor and the negative electrode of the first diode D0 are connected with the power supply VDD, and the circuit is characterized in that a second resistor R1 or a second diode D1 is connected between the USB ID pin of the terminal chip and a USB ID pin of a terminal USB socket. The circuit for protecting the USB interface of the terminal chip can prevent the USB ID pin of the terminal chip from burnout, thereby protecting a USB charging function of the terminal.

Description

technical field [0001] The invention relates to the technical field of terminals, in particular to a circuit for protecting a USB interface of a terminal chip. Background technique [0002] Nowadays, smart mobile terminals are widely used and widely popularized. Design manufacturers make the structure thinner and thinner in order to have a fashionable appearance. Therefore, most of these smart mobile terminals use built-in batteries (that is, non-removable batteries). Through AP (Application Processor, Application Processor) The standard USB interface on the chip charges the built-in battery. [0003] The USB interface of the existing AP chip, its pins are VBUS / VCHG (charging pin), D- / DM (USB data negative pin), D+ / DP (USB data positive pin), ID (USB ID pin), GND (USB ground pin). Among them, the USB ID pin is used to identify different cable endpoints. Among them, the USB ID pin of one cable (mini-A plug, terminal as the host) is grounded, and the USB ID pin of the other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
Inventor 曾海军
Owner ZTE CORP