Circuit supporting CC logic control

Abstract

The utility model relates to a circuit supporting CC logic control, which comprises a Type-C interface and a pull-up power supply VDD, and a CC pin of the Type-C interface is connected with a master-slave control circuit. The circuit supporting CC logic control replaces a traditional CC logic chip scheme, effectively reduces the manufacturing cost, simplifies the circuit design, improves the reliability, can quickly respond to the voltage change of the CC pin of the Type-C interface, accurately identifies the role of a connecting device, is suitable for different types of Type-C devices, and has a wide application prospect. The Type-C interface has the advantages of being low in cost, excellent in performance, high in reliability, high in applicability and the like, and powerful support is provided for popularization and application of the Type-C interface.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic information, in particular to a circuit supporting CC logic control. Background Art

[0002] In the prior art, the Type-C interface has been increasingly widely used in electronic devices due to its advantages such as reversible insertion and bidirectional power supply. However, the versatility of the Type-C interface requires the corresponding control circuit to be realized. For example, by identifying the role of the connected device, the Type-C interface can switch between the host and device modes to achieve different functions, such as charging and data transmission.

[0003] Traditional CC logic control circuits are usually implemented using CC logic chips. However, CC logic chips are relatively expensive. For mid- and low-end products that pursue cost-effectiveness, this will increase production costs, reduce profit margins, and be detrimental to product marketing. Summary of the invention

[0004] In order to solve the above problems, the utility model provides a circuit supporting CC logic control, which replaces the traditional CC logic chip and effectively reduces the manufacturing cost of the circuit.

[0005] In order to achieve the above object, the circuit supporting CC logic control designed by the utility model includes a Type-C interface and a pull-up power supply VDD, and the CC pin of the Type-C interface is connected to a master-slave control circuit, and the master-slave control circuit includes:

[0006] Transistor Q1100, the collector of the transistor Q1100 is connected to the pull-up power supply VDD through a resistor R1114, the base of the transistor Q1100 is connected to the CC pin through a resistor R1107, and the emitter of the transistor Q1100 is grounded;

[0007] Resistor R1113 is connected in parallel between the base and emitter of transistor Q1100;

[0008] A resistor R1105, one end of which is connected to the pull-up power supply VDD, and the other end of which is connected to the connection point between the resistor R1107 and the CC pin;

[0009] Transistor Q1101, the collector of transistor Q1101 is connected to the pull-up power supply VDD through resistor R807, and the output end is formed through resistor R1120; the base of transistor Q1101 is connected to the collector of transistor Q1100 through resistor R805, and the emitter of transistor Q1101 is grounded;

[0010] Resistor R806 is connected in parallel between the base and emitter of transistor Q1101;

[0011] Wherein, the transistor Q1100 and the transistor Q1101 are both NPN transistors.

[0012] In order to improve the stability of the circuit, a capacitor C814 is further included, and the capacitor C814 is connected between the connection point between the resistor R1107 and the CC pin and the ground.

[0013] A further solution is to further include a capacitor C816, wherein the capacitor C816 is connected between a connection point between the collector of the transistor Q1100 and the resistor R805 and the ground.

[0014] In order to prevent voltage backflow, a diode CR1104 is further included, wherein the anode of the diode CR1104 is connected to the resistor R1105 , and the cathode of the diode CR1104 is connected to the connection point between the resistor R1107 and the CC pin.

[0015] In order to protect the subsequent circuit, a diode CR1105 is also included, the anode of the diode CR1105 is connected to the connection point between the resistor R1120 and the collector of the transistor Q1101, and the cathode is grounded.

[0016] In order to realize the forward and reverse insertion function of the Type-C interface, the CC pin includes a CC1 pin and a CC2 pin, and the CC1 pin and the CC2 pin are short-circuited by a resistor R812, and the resistance value of the resistor R812 is zero.

[0017] The circuit supporting CC logic control designed by the utility model replaces the traditional CC logic chip solution, effectively reduces manufacturing costs, simplifies circuit design, and improves reliability. At the same time, it can quickly respond to voltage changes of the CC pin of the Type-C interface and accurately identify the role of the connected device. It is suitable for different types of Type-C devices and has the advantages of low cost, excellent performance, high reliability, strong applicability, etc., providing strong support for the popularization and application of the Type-C interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a circuit schematic diagram of a circuit supporting CC logic control provided in an embodiment of the present application;

[0019] Figure 2 This is a circuit schematic diagram of the Type-C interface provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0021] Example 1.

[0022] Reference Figure 1 and Figure 2 As shown, the circuit supporting CC logic control described in this embodiment includes a Type-C interface and a pull-up power supply VDD, and the CC pin of the Type-C interface is connected to a master-slave control circuit, and the master-slave control circuit includes:

[0023] Transistor Q1100, the collector of transistor Q1100 is connected to the pull-up power supply VDD through resistor R1114, the base of transistor Q1100 is connected to the CC pin through resistor R1107, and the emitter of transistor Q1100 is grounded; resistor R1107 is used to limit the current flowing through the base of transistor Q1100 to prevent excessive current from burning out transistor Q1100;

[0024] Resistor R1113 is connected in parallel between the base and emitter of transistor Q1100;

[0025] A resistor R1105, one end of which is connected to the pull-up power supply VDD, and the other end of which is connected to the connection point between the resistor R1107 and the CC pin;

[0026] Transistor Q1101, the collector of transistor Q1101 is connected to the pull-up power supply VDD through resistor R807, and the output terminal is formed through resistor R1120; the base of transistor Q1101 is connected to the collector of transistor Q1100 through resistor R805, and the emitter of transistor Q1101 is grounded; resistor R807 is used to limit the current flowing through the base of transistor Q1101 to prevent excessive current from burning transistor Q1101;

[0027] Resistor R806 is connected in parallel between the base and emitter of transistor Q1101;

[0028] Wherein, the transistor Q1100 and the transistor Q1101 are both NPN transistors.

[0029] In specific implementation, the Type-C interface can be applied to mobile terminals, such as mobile phones, smart watches, smart bracelets, etc., and the output terminal is connected to a GPIO port USB_ID of the mobile terminal CPU; when working, the master-slave control circuit receives the level signal from the CC pin of the Type-C interface, converts it into a voltage signal of the system power domain, and outputs the signal to USB_ID through the output terminal, so that the CPU of the mobile terminal can identify the type of external device connected to the Type-C interface. Among them, the pull-up power supply VDD can be connected to the internal system of the mobile terminal. The 1.8V voltage is normally supplied.

[0030] Specifically, when the Type-C interface is not connected to any device, the CC pin is in a floating state and no external signal is input. At this time, the pull-up power supply VDD forms a pull-up effect, and after voltage division by resistors R1105 and R1113, a default high level is given to the base of transistor Q1100, so that transistor Q1100 is turned on, and the collector voltage of transistor Q1100 is pulled down. The low voltage of the collector of Q1100 makes the base voltage of Q1101 too low and cannot be turned on (transistor Q1101 is cut off). Transistor Q1101 is pulled up by the pull-up power supply VDD, and outputs a high-level signal to USB_ID, indicating that no device is currently connected or a charging cable is connected.

[0031] When the Type-C interface is connected to the Type-c charging cable, the corresponding CC pin inside the Type-c will be connected to the VBUS (5V) power supply through a built-in pull-up resistor (usually 56k). At this time, the pull-up resistor inside the Type-c will pull up the voltage of the CC pin in the Type-C interface. The high voltage of the CC pin turns on the transistor Q1100 and the collector voltage is pulled down. Similarly, the low voltage of the collector of the transistor Q1100 makes the base voltage of Q1101 too low and cannot be turned on. Q1101 is cut off, and the transistor Q1101 is pulled up due to the pull-up power supply VDD, and a high-level signal is output to USB_ID, indicating that the current connection is the charging cable that provides power.

[0032] When the Type-C interface is connected to the OTG cable, the CC pin inside the OTG cable also has a pull-down resistor (usually 5.1K). The pull-down resistor inside the OTG cable pulls down the CC pin voltage. The low voltage of the CC pin prevents the transistor Q1100 from conducting, and the collector voltage of the transistor Q1100 is relatively high. The high voltage of the collector of the transistor Q1100 increases the base voltage of the transistor Q1101, that is, the transistor Q1101 is turned on, so that its collector outputs a low-level signal to USB_ID, indicating that the OTG cable is currently connected.

[0033] In this embodiment, if Figure 1 As shown, in order to improve the stability of the circuit, a capacitor C814 is further included, and the capacitor C814 is connected between the connection point between the resistor R1107 and the CC pin and the ground. In this embodiment, when the external device is connected to or disconnected from the Type-C interface, the voltage of the CC pin may fluctuate or spike momentarily, and the capacitor C814 can absorb or release charge, play a role in buffering the voltage, suppress these voltage fluctuations, and make the voltage of the CC pin more stable.

[0034] In this embodiment, if Figure 1As shown, a capacitor C816 is also included, and the capacitor C816 is connected between the connection point between the collector of the transistor Q1100 and the resistor R805 and the ground. In this way, when the transistor Q1101 changes from the on state to the off state, its collector voltage will rise rapidly, and some oscillations or spikes may appear. At this time, the capacitor C816 can absorb or release these excess charges, play the role of buffering voltage, suppress the drastic change of voltage, and enable the base of the transistor Q1101 to obtain a more stable voltage signal.

[0035] In this embodiment, if Figure 1 As shown, in order to prevent voltage backflow, a diode CR1104 is also included, the positive electrode of the diode CR1104 is connected to the resistor R1105, and the negative electrode is connected to the connection point between the resistor R1107 and the CC pin. In this way, when the Type-C interface is connected to the Type-c charging cable, the unidirectional conduction of the diode CR1104 can prevent the input voltage from backflowing to the pull-up power supply VDD, which is safer.

[0036] In this embodiment, if Figure 1 As shown, in order to protect the subsequent circuit, a diode CR1105 is also included, the positive electrode of the diode CR1105 is connected to the connection point between the resistor R1120 and the collector of the transistor Q1101, and the negative electrode is grounded. In this embodiment, the diode CR1105 is a bidirectional thyristor. In this way, due to the bidirectional conduction characteristics of the bidirectional thyristor, when the voltage at the connection point between the resistor R1120 and the collector of the transistor Q1101 is higher than the forward conduction voltage or lower than the negative conduction voltage, the diode CR1105 will be turned on. Even if the voltage at the connection point fluctuates abnormally (too high or too low) due to external interference, circuit abnormality, etc., the diode CR1105 can clamp it within a safe voltage range, effectively protecting the subsequent circuit connected to USB_ID and preventing it from being damaged due to excessively high or too low voltage.

[0037] In this embodiment, if Figure 1 As shown, in order to realize the forward and reverse insertion function of the Type-C interface, the CC pin includes a CC1 pin and a CC2 pin, and the CC1 pin and the CC2 pin are short-circuited by a resistor R812, and the resistance value of the resistor R812 is zero. In this way, by short-circuiting the CC1 pin and the CC2 pin, the two signals can be combined into one, which simplifies the processing logic of the subsequent circuit and reduces the complexity of the circuit design.

[0038] The circuit supporting CC logic control provided in this embodiment replaces the traditional CC logic chip solution, effectively reduces manufacturing costs, simplifies circuit design, and improves reliability. At the same time, it can quickly respond to voltage changes of the CC pin of the Type-C interface and accurately identify the role of the connected device. It is suitable for different types of Type-C devices and has the advantages of low cost, excellent performance, high reliability, strong applicability, etc., providing strong support for the popularization and application of the Type-C interface.

[0039] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A circuit supporting CC logic control, comprising a Type-C interface and a pull-up power supply VDD, characterized in that: The CC pin of the Type-C interface is connected to a master-slave control circuit, and the master-slave control circuit includes: Transistor Q1100, the collector of the transistor Q1100 is connected to the pull-up power supply VDD through a resistor R1114, the base of the transistor Q1100 is connected to the CC pin through a resistor R1107, and the emitter of the transistor Q1100 is grounded; Resistor R1113 is connected in parallel between the base and emitter of transistor Q1100; A resistor R1105, one end of which is connected to the pull-up power supply VDD, and the other end of which is connected to the connection point between the resistor R1107 and the CC pin; Transistor Q1101, the collector of transistor Q1101 is connected to the pull-up power supply VDD through resistor R807, and the output end is formed through resistor R1120; the base of transistor Q1101 is connected to the collector of transistor Q1100 through resistor R805, and the emitter of transistor Q1101 is grounded; Resistor R806 is connected in parallel between the base and emitter of transistor Q1101; Wherein, the transistor Q1100 and the transistor Q1101 are both NPN transistors.

2. The circuit supporting CC logic control according to claim 1, characterized in that: A capacitor C814 is also included, and the capacitor C814 is connected between a connection point between the resistor R1107 and the CC pin and ground.

3. The circuit supporting CC logic control according to claim 1 or 2, characterized in that: The device further includes a capacitor C816, which is connected between a connection point between the collector of the transistor Q1100 and the resistor R805 and the ground.

4. The circuit supporting CC logic control according to claim 1, characterized in that: A diode CR1104 is also included, wherein the anode of the diode CR1104 is connected to the resistor R1105 , and the cathode of the diode CR1104 is connected to the connection point between the resistor R1107 and the CC pin.

5. The circuit supporting CC logic control according to claim 1 or 4, characterized in that: A diode CR1105 is also included, wherein the anode of the diode CR1105 is connected to the connection point between the resistor R1120 and the collector of the transistor Q1101, and the cathode of the diode CR1105 is grounded.

6. The circuit supporting CC logic control according to claim 1, characterized in that: The CC pins include a CC1 pin and a CC2 pin. The CC1 pin and the CC2 pin are short-circuited by a resistor R812. The resistance value of the resistor R812 is zero.

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