CN204883704U

CN204883704U - C type USB IC interface control circuit

Info

Publication number: CN204883704U
Application number: CN201520633673.0U
Authority: CN
Inventors: 刘小灵
Original assignee: Auspicious Science And Technology Ltd Is Readily Taken Opportunity To By Shenzhen
Current assignee: Auspicious Science And Technology Ltd Is Readily Taken Opportunity To By Shenzhen
Priority date: 2015-08-21
Filing date: 2015-08-21
Publication date: 2015-12-16
Anticipated expiration: 2025-08-21

Abstract

The utility model relates to a C type USB IC interface control circuit, including the built -in NULL who has microprocessor, NULL's first pin PIN1 is connected to the CC line of C type USB interface through a second resistance R2, and NULL's second pin PIN2 is connected to NULL's VDD end through first resistance R1, it closes and at the normal controlled electronic switch that switches on of during operation of microprocessor at the normal during operation of microprocessor still to be provided with one between first pin and the second pin, first pin, second pin and NULL's common grounding end VSS is connected respectively to controlled electronic switch's three end foot. The utility model discloses power supply voltage is abnormal in the system, and the unable normal during operation of microprocessor is controlled the CC logic of C type USB interface by the VDD end and the cooperation of first resistance, controlled electronic switch and second resistance, lets remote site C type USB equipment can correctly discern the CC logic. Thereby the CC line that can guarantee C type USB interface still can normally be worked under the electric state falling completely.

Description

C type usb control circuit

Technical field

The utility model relates to USB technical field, particularly relates to a kind of C type usb control circuit.

Background technology

C type USB interface (UBSTYPE-C) is that USB-IF is organized in issue in 2014, for the new interface of unified original USBtype-A and USBtype-B interface, its advantage is, minily small and exquisitely, positive and negative identically, two-way to connect, and can current collection source, audio frequency, video, data be transmitted in all over the body.In order to realize these advantages characteristics, C type USB interface needs an integrated chip being built-in with microprocessor usually, CC(ConfigurationChannel by USBTYPE-C connecting line) line, carry out shaking hands and identification with the opposite equip. be connected, to determine that both sides belong to main equipment still from equipment in power supply and data transmission.But, traditional microprocessor chip is when realizing USBTYPE-C interface standard, there is individual drawback, when equipment is in complete power-down state, namely in standard during the DeadBattery pattern of defined, cannot control the state of CC interface, may therefore cause equipment when battery electric quantity is low, cannot by opposite end USBTYPE-C equipment, the supplier of electricity identifications such as such as adapter, thus complete failure.Such as, portable power source product, cell voltage just again cannot charge lower than after the normal working voltage of USBTYPE-C interface control chip.

Utility model content

Technical problem to be solved in the utility model is, provides a kind of C type usb control circuit, normally works can realize the CC line of C type USB interface under complete power-down state easily.

For solving the problems of the technologies described above, the utility model provides following technical scheme: a kind of C type usb control circuit, comprise the integrated chip being built-in with microprocessor, first pin PIN1 of integrated chip is connected to the CC line of C type USB interface by one second resistance R2, second pin PIN2 of integrated chip is connected to the vdd terminal of integrated chip by the first resistance R1, also be provided with one between described first pin and the second pin to close and the controlled electronic switch of the conducting when microprocessor cisco unity malfunction when microprocessor normally works, three end pin of described controlled electronic switch connect the first pin respectively, the common ground end VSS of the second pin and integrated chip.

Further, described controlled electronic switch is NMOS tube Q1, and the drain electrode of described NMOS tube Q1, grid and source electrode are connected respectively the common ground end VSS of the first pin, the second pin and integrated chip.

The utility model also provides following another kind of technical scheme: a kind of C type usb control circuit, comprise the integrated chip being built-in with microprocessor, first pin PIN1 of microprocessor is connected to the CC line of C type USB interface by one second resistance R2, second pin PIN2 of microprocessor is connected to the vdd terminal of integrated chip by the first resistance R1, also be provided with one between described first pin and the second pin to close and the controlled electronic switch of the conducting when microprocessor cisco unity malfunction when microprocessor normally works, three end pin of described controlled electronic switch connect the first pin respectively, the common ground end VSS of the second pin and integrated chip, described first resistance R1, it is inner that second resistance R2 and controlled electronic switch are all integrated in described integrated chip.

After adopting technique scheme, the utility model at least has following beneficial effect: the utility model, when system power supply voltage is normal, is responsible for the CC line of control C type USB interface by microprocessor, complete the communication with opposite end USBTYPE-C equipment; When system power supply voltage is abnormal, when microprocessor cannot normally work, by vdd terminal by controlling the CC logic of C type USB interface with coordinating of the first resistance, controlled electronic switch and the second resistance.Opposite end C type USB device is allowed can correctly to identify CC logic.Thus effectively can ensure that the CC line of C type USB interface normally works, especially still can normally work under complete power-down state.

Accompanying drawing explanation

Fig. 1 is the electrical block diagram of a kind of embodiment of the utility model C type usb control circuit.

Fig. 2 is the electrical block diagram of the another kind of embodiment of the utility model C type usb control circuit.

Embodiment

It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can be combined with each other, and are described in further detail the utility model below in conjunction with the drawings and specific embodiments.

As shown in Figure 1, the utility model provides a kind of C type usb control circuit, comprise the integrated chip being built-in with microprocessor, first pin PIN1 of integrated chip is connected to the CC line of C type USB interface by one second resistance R2, second pin PIN2 of integrated chip is connected to the vdd terminal of integrated chip by the first resistance R1, also be provided with one between described first pin PIN1 and the second pin PIN2 to close and the controlled electronic switch of the conducting when microprocessor cisco unity malfunction when microprocessor normally works, three end pin of described controlled electronic switch connect the first pin respectively, the common ground end VSS of the second pin and integrated chip.When reality manufactures, can adopt metal-oxide-semiconductor or other can realize break-make control module switch or module.In specific embodiment as shown in Figure 1, described controlled electronic switch is NMOS tube Q1, and the drain electrode of described NMOS tube Q1, grid and source electrode are connected respectively the common ground end VSS of the first pin, the second pin and integrated chip.

And in another embodiment as shown in figure 2, itself and the key distinction embodiment illustrated in fig. 1 are: described first resistance R1, it is inner that second resistance R2 and controlled electronic switch are all integrated in described integrated chip, correspondingly, butted line is finely tuned: the CC line being connected to C type USB interface by the first pin PIN1 of microprocessor by one second resistance R2, be connected to the vdd terminal of integrated chip by the first resistance R1 by the second pin PIN2 of microprocessor, also be provided with one between described first pin and the second pin to close and the controlled electronic switch of the conducting when microprocessor cisco unity malfunction when microprocessor normally works, three end pin of described controlled electronic switch connect the first pin respectively, the common ground end VSS of the second pin and integrated chip.The present embodiment is inner by each electronic devices and components being all integrated into same integrated chip, and its product integrated level is higher, convenient manufacture and use.

When specifically using, when the supply voltage VDD of equipment can ensure that microprocessor normally works, first pin PIN1 is according to the CC line of microprocessor internal instruction management C type USB interface and the communication of opposite equip. and Automatic level control, second pin PIN2 output low level, close NMOS tube Q1, avoid NMOS tube Q1 to affect communication and the Automatic level control of CC line.When the power supply VDD of equipment cannot ensure that the microprocessor of integrated chip inside normally works, the first pin PIN1 and the second pin PIN2 is high-impedance state, and the control of microprocessor to CC communication and level will be lost efficacy.Integrated chip outside directly controls NMOS tube Q1 by system power supply VDD by the first resistance R1 by one, ensure that the first pin PIN1 current potential is low level, through the second resistance R2 to the fixing electric characteristic of one, the CC line of C type USB interface, thus the identification CC making the C type USB interface equipment of opposite end correct.Q1 can be placed in integrated chip inside, also can be placed in integrated circuit external.

Although illustrate and described embodiment of the present utility model, for the ordinary skill in the art, be understandable that, can carry out the change of multiple equivalence, amendment, replacement and modification to these embodiments when not departing from principle of the present utility model and spirit, scope of the present utility model is limited by claims and equivalency range thereof.

Claims

1. a C type usb control circuit, comprise the integrated chip being built-in with microprocessor, it is characterized in that, first pin PIN1 of integrated chip is connected to the CC line of C type USB interface by one second resistance R2, second pin PIN2 of integrated chip is connected to the vdd terminal of integrated chip by the first resistance R1, also be provided with one between described first pin and the second pin to close and the controlled electronic switch of the conducting when microprocessor cisco unity malfunction when microprocessor normally works, three end pin of described controlled electronic switch connect the first pin respectively, the common ground end VSS of the second pin and integrated chip.

2. C type usb control circuit as claimed in claim 1, it is characterized in that, described controlled electronic switch is NMOS tube Q1, and the drain electrode of described NMOS tube Q1, grid and source electrode are connected respectively the common ground end VSS of the first pin, the second pin and integrated chip.

3. a C type usb control circuit, comprise the integrated chip being built-in with microprocessor, it is characterized in that, first pin PIN1 of microprocessor is connected to the CC line of C type USB interface by one second resistance R2, second pin PIN2 of microprocessor is connected to the vdd terminal of integrated chip by the first resistance R1, also be provided with one between described first pin and the second pin to close and the controlled electronic switch of the conducting when microprocessor cisco unity malfunction when microprocessor normally works, three end pin of described controlled electronic switch connect the first pin respectively, the common ground end VSS of the second pin and integrated chip, described first resistance R1, it is inner that second resistance R2 and controlled electronic switch are all integrated in described integrated chip.

4. C type usb control circuit as claimed in claim 3, it is characterized in that, described controlled electronic switch is NMOS tube Q1, and the drain electrode of described NMOS tube Q1, grid and source electrode are connected respectively the common ground end VSS of the first pin, the second pin and integrated chip.