CN209343329U - A self-adaptive USB interface circuit with serial communication and fast charge recognition - Google Patents

Abstract

Adaptive usb circuit is identified with serial communication and fast charge the utility model discloses a kind of, new design is carried out on hardware and software simultaneously, it is connected in parallel by serial ports and USB interface, not only it is able to achieve data communication, and by the method for transmitting signals of time-sharing multiplex, and the fast charge output of adapter QC can be triggered；This patent can avoid using many and diverse usb protocol and hardware circuit design, save software resource, reduce development cost.

Description

A self-adaptive USB interface circuit with serial communication and fast charge recognition

technical field

The utility model belongs to the field of USB communication and charging, in particular to an adaptive USB interface circuit with serial port communication and fast charging identification.

Background technique

With the popularization of electronic products, terminal products are generally connected with other devices through a USB (Universal Serial Bus, Universal Serial Bus) interface, so as to realize functions such as charging and data transmission. However, because the USB protocol occupies software resources and is compatible with the QC fast charging trigger of the adapter, the hardware is more complicated.

In view of this, the inventor specially designed a USB interface circuit with serial port communication and fast charging recognition self-adaptation, and this case was born from it.

Contents of the invention

The purpose of the utility model is to provide a self-adaptive USB interface circuit with serial port communication and fast charging recognition, and at the same time carry out a new design on hardware and software, and connect the serial port and USB interface in parallel to not only realize data communication, but also Through the signal transmission method of time-division multiplexing, the fast charging output of the adapter QC can be triggered; this patent can avoid the use of complicated USB protocol and hardware circuit design, save software resources, and reduce development costs.

In order to achieve the above object, the technical scheme adopted by the utility model is as follows:

A self-adaptive USB interface circuit with serial communication and fast charging identification, including Micro USB interface (J1), power input positive pole (VCC), power input negative pole, serial communication sending port (TX1), serial communication receiving port (RX1) , the first resistor (R30), the second resistor (R29), the first capacitor (C39), the third resistor (R35), the fourth resistor (R34), the second capacitor (C49), the first fast charge trigger control port (USBEND-), the second fast charge trigger control port (USBEND+), the third capacitor (C40);

The Micro USB interface (J1) includes VBUS pins, D+ data transmission pins, D- data transmission pins, and ID pins (for OTG identification lines, high level when suspended, low level when connected to GND, connected to the device The OTG function will be turned on, and the OTG function will change the direction of power supply, and will output current from this terminal like an external), GND pin; the positive pole of the power input (VCC) is electrically connected to the VBUS pin, and the negative pole of the power input is connected to the VBUS pin. The GND pin is electrically connected to provide an operating voltage; the third capacitor (C40) is set between the power input positive pole (VCC) and the power input negative pole to filter out power supply ripple; the D+ The data transmission pin is electrically connected to the serial communication sending port (TX1); the D-data transmission pin is electrically connected to the serial communication receiving port (RX1); one end of the first resistor (R30) is connected to the power supply The input negative electrode is electrically connected, and the other end of the first resistor (R30) is electrically connected to the D-data transmission pin and one end of the second resistor (R29); the other end of the second resistor (R29) One end is electrically connected to the first fast charge trigger control port (USBEND-) and one end of the first capacitor (C39); the other end of the first capacitor (C39) is electrically connected to the power input negative pole; One end of the third resistor (R35) is electrically connected to the negative pole of the power supply input, and the other end of the third resistor (R35) is electrically connected to the D+ data transmission pin and one end of the fourth resistor (R34) respectively. The other end of the fourth resistor (R34) is electrically connected to the second fast charge trigger control port (USBEND+) and one end of the second capacitor (C49); the second capacitor (C49) The other end is electrically connected to the negative pole of the power input.

Preferably, the ID pin is floating.

Preferably, a fifth resistor (R37) is provided between the D-data transmission pin and the serial communication receiving port (RX1), and the resistance value of the fifth resistor (R37) is 0 ohms.

Preferably, a sixth resistor (R38) is provided between the D+ data transmission pin and the serial communication sending port (TX1), and the resistance value of the sixth resistor (R38) is 1000 ohms.

A processing method of the above-mentioned USB interface circuit with serial port communication and fast charge recognition self-adaption, applying the above-mentioned USB interface circuit with serial port communication and fast charge recognition self-adaption to the electronic equipment system, and adopting A signal transmission method for time multiplexing, specifically comprising the following steps:

Step S01, power on the electronic equipment system;

Step S02, judging whether the electronic device system needs to perform external communication through the Micro USB interface (J1), if it is judged that it is necessary, then go to step S03, if it is judged that it is not necessary, then go to step S05;

Step S03, if the electronic equipment system needs to receive communication data, then the communication data is sequentially transmitted to the electronic equipment system through the D-data transmission pin and the serial communication receiving port (RX1); if the electronic equipment system needs to send communication data externally, then The communication data is transmitted to the external communication device through the serial communication sending port (TX1) and the D+ data transmission pin in turn;

Step S04, the electronic equipment system closes the serial communication, that is, closes the serial communication receiving port (RX1) and the serial communication sending port (TX1);

Step S05 , the electronic device system triggers the fast charging function of the adapter by controlling the first fast charging trigger control port (USBEND-) and the second fast charging trigger control port (USBEND+).

Compared with the traditional USB interface circuit, the utility model provides a self-adaptive USB interface circuit with serial communication and fast charging recognition, and at the same time, a new design is carried out on the hardware and software, and the serial port and the USB interface are connected in parallel. And the fifth resistor (R37) is set between the D-data transmission pin and the serial communication receiving port (RX1), and the fifth resistance (R37) is set between the D+ data transmission pin and the serial communication sending port (TX1). Six resistors (R38) are used for isolation to avoid affecting the fast charging function of the adapter QC during serial communication; not only can data communication be realized, but also can trigger the fast charging output of the adapter QC through the signal transmission method of time-division multiplexing; this patent It can avoid the use of complicated USB protocol and hardware circuit design, save software resources and reduce development costs.

Description of drawings

Fig. 1 is a system block diagram of the present utility model;

Fig. 2 is the software control flowchart of the utility model.

Detailed ways

As shown in Figure 1 and Figure 2, an adaptive USB interface circuit with serial communication and fast charging recognition, including MicroUSB interface J1, power input positive VCC, power input negative, serial communication sending port (TX1), serial communication receiving Port (RX1), first resistor R30, second resistor R29, first capacitor C39, third resistor R35, fourth resistor R34, second capacitor C49, first fast charge trigger control port USBEND-, second fast charge trigger Control port USBEND+, third capacitor C40;

Micro USB interface J1 includes VBUS pin, D+ data transmission pin, D- data transmission pin, ID pin (for OTG identification line, high level when floating, low level when connected to GND, OTG function will be turned on when connected to the device , the OTG function will change the power supply direction, and it will output current from this end like an external), GND pin; the positive pole of the power input VCC is electrically connected to the VBUS pin, and the negative pole of the power input is electrically connected to the GND pin to provide operating voltage; The third capacitor C40 is set between the power input positive pole VCC and the power input negative pole to filter out the power supply ripple; the D+ data transmission pin is electrically connected to the serial communication sending port TX1; the D- data transmission pin is connected to the serial communication receiving port Port RX1 is electrically connected; one end of the first resistor R30 is electrically connected to the negative pole of the power input, and the other end of the first resistor R30 is electrically connected to the D-data transmission pin and one end of the second resistor R29; the second resistor R29 The other end of the first fast charging trigger control port USBEND- and one end of the first capacitor C39 are electrically connected respectively; the other end of the first capacitor C39 is electrically connected to the negative pole of the power input; one end of the third resistor R35 is connected to the negative pole of the power input Electrically connected, the other end of the third resistor R35 is electrically connected to the D+ data transmission pin and one end of the fourth resistor R34 respectively; the other end of the fourth resistor R34 is respectively connected to the second fast charge trigger control port USBEND+, the second capacitor One end of C49 is electrically connected; the other end of the second capacitor C49 is electrically connected to the negative pole of the power input.

The ID pin is left floating.

A fifth resistor R37 is provided between the D-data transmission pin and the serial communication receiving port RX1, and the resistance of the fifth resistor R37 is 0 ohms.

A sixth resistor R38 is provided between the D+ data transmission pin and the serial communication sending port TX1, and the resistance of the sixth resistor R38 is 1000 ohms.

The resistance value of the first resistor R30 is 4.7kΩ, the resistance value of the second resistor R29 is 22kΩ, the capacitance value of the first capacitor C39 is 100nF, the resistance value of the third resistor R35 is 4.7kΩ, and the resistance value of the fourth resistor R34 is 22kΩ, the capacitance of the second capacitor C49 is 100nF, and the capacitance of the third capacitor C40 is 22uF.

A processing method for an adaptive USB interface circuit with serial port communication and fast charge identification as described above, applying the above-mentioned USB interface circuit with serial port communication and fast charge identification adaptive to electronic equipment systems, and using time-division multiplexing The signal transmission method used specifically includes the following steps:

Step S01, power on the electronic equipment system;

Step S02, judging whether the electronic device system needs external communication through the Micro USB interface J1, if it is judged necessary, go to step S03, if it is judged not necessary, go to step S05;

Step S03, if the electronic equipment system needs to receive communication data, the communication data is transmitted to the electronic equipment system through the D-data transmission pin and the serial communication receiving port RX1 in sequence; if the electronic equipment system needs to send communication data externally, the communication data is sequentially passed through The serial communication sending port TX1, D+ data transmission pin is transmitted to the external communication equipment;

Step S04, the electronic equipment system closes the serial communication, that is, closes the serial communication receiving port RX1 and the serial communication sending port TX1;

Step S05 , the electronic device system triggers the fast charging function of the adapter by controlling the first fast charging trigger control port USBEND- and the second fast charging trigger control port USBEND+.

Compared with the traditional USB interface circuit, the present embodiment provides a self-adaptive USB interface circuit with serial communication and fast charge recognition. On the basis of the traditional USB interface, a new design is carried out on hardware and software at the same time, through The serial port and the USB interface are connected in parallel, and a fifth resistor R37 is set between the D- data transmission pin and the serial communication receiving port RX1, and a sixth resistor is set between the D+ data transmission pin and the serial communication sending port TX1 R38 performs an isolation function to avoid affecting the fast charging function of the adapter QC during serial communication; it can not only realize data communication, but also trigger the fast charging output of the adapter QC through the signal transmission method of time-division multiplexing; this patent can avoid complicated use Advanced USB protocol and hardware circuit design save software resources and reduce development costs.

The above-mentioned embodiments and drawings do not limit the product form and style of the present utility model, and any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present utility model.

Claims (4)

1. A USB interface circuit with serial port communication and fast charge recognition self-adaptation, characterized in that: comprising Micro USB interface (J1), power input positive pole (VCC), power input negative pole, serial communication sending port (TX1), serial port Communication receiving port (RX1), first resistor (R30), second resistor (R29), first capacitor (C39), third resistor (R35), fourth resistor (R34), second capacitor (C49), second capacitor A fast charge trigger control port (USBEND-), a second fast charge trigger control port (USBEND+), and a third capacitor (C40); The Micro USB interface (J1) includes VBUS pins, D+ data transmission pins, D-data transmission pins, ID pins, and GND pins; the power input positive pole (VCC) is electrically connected to the VBUS pins connected, the negative pole of the power input is electrically connected to the GND pin for providing an operating voltage; the third capacitor (C40) is set between the positive pole of the power input (VCC) and the negative pole of the power input for Filter power supply ripple; the D+ data transmission pin is electrically connected to the serial communication sending port (TX1); the D- data transmission pin is electrically connected to the serial communication receiving port (RX1); the first resistor One end of (R30) is electrically connected to the negative pole of the power input, and the other end of the first resistor (R30) is electrically connected to the D-data transmission pin and one end of the second resistor (R29); The other end of the second resistor (R29) is electrically connected to the first fast charging trigger control port (USBEND-) and one end of the first capacitor (C39); the other end of the first capacitor (C39) is connected to The negative pole of the power input is electrically connected; one end of the third resistor (R35) is electrically connected to the negative pole of the power input, and the other end of the third resistor (R35) is respectively connected to the D+ data transmission pin, One end of the fourth resistor (R34) is electrically connected; the other end of the fourth resistor (R34) is electrically connected to the second fast charging trigger control port (USBEND+) and one end of the second capacitor (C49) respectively; The other end of the second capacitor (C49) is electrically connected to the negative electrode of the power input. 2. A USB interface circuit with serial port communication and fast charging identification adaptation according to claim 1, characterized in that: the ID pin is suspended. 3. A kind of USB interface circuit with serial port communication and fast charge recognition self-adaptation according to claim 1, it is characterized in that: between the described D-data transmission pin and the serial port communication receiving port (RX1) there is a first Five resistors (R37), the resistance of the fifth resistor (R37) is 0 ohms. 4. A kind of USB interface circuit with serial port communication and fast charging recognition self-adaptation according to claim 1, it is characterized in that: a sixth pin is provided between the D+ data transmission pin and the serial communication sending port (TX1). Resistor (R38), the resistance value of the sixth resistor (R38) is 1000 ohms.