CN105718407B - The USB switch of chip controls - Google Patents

Abstract

The invention discloses a chip-controlled USB switcher, which includes: a USB male head, which is connected with a USB interface on a computer machine, and the USB male head has four USB3.0 signal pins and two USB2.0 signal pins. Signal pin; USB female head, which is connected with the USB interface of the USB3.0 device. The USB female head has four USB3.0 signal pins and two USB2.0 signal pins. Described USB male head is also docked through power supply positive pole pin, ground pin respectively; , a trigger terminal, the pins of the selection terminal are in one-to-one correspondence with the pins of the first selected terminal and the second selected terminal respectively. The equipment used for testing is reduced, partial plugging damage and troubles in operation are avoided, and man-hours are saved.

Description

Chip-controlled USB switch

【Technical field】

The invention relates to a switcher, in particular to a chip-controlled USB switcher.

【Background technique】

For electronic products such as notebook computers, there are usually several USB (Universal Serial Bus, Universal Serial Bus) interfaces on it. The current USB interfaces on electronic products are usually USB3.0 interfaces. Before the electronic products leave the factory, tests will be carried out to ensure that the functions of each interface are qualified. For the USB3.0 interface, in order to be backward compatible, it is necessary not only to test whether it can work normally when connected to USB3.0 devices, but also to test whether the devices connected to USB2.0 can work normally. USB2.0 devices will use a set of send (transport) and receive (receive) pins, while USB3.0 devices will use two sets of send and receive pins.

The current test method is to use USB2.0 equipment (such as U disk), USB3.0 equipment (such as U disk) to carry out USB2.0 and USB3.0 functional tests on the USB interface of the electronic product respectively, so Different USB devices need to be used during the test, and two plugging and unplugging are required.

It can be seen that, with the above test method, the number of plugging and unplugging is large, the testing process is cumbersome, time-consuming and easy to cause plugging damage; at the same time, two types of U disks need to be used, resulting in unnecessary waste.

In view of this, it is necessary to develop a chip-controlled USB switch to solve the above problems.

【Content of invention】

Therefore, the object of the present invention is to provide a chip-controlled USB switcher to solve the problem of switching backward compatible USB3.0 devices so as to achieve their functions of working in USB2.0 and USB3.0 states respectively.

In order to achieve the above object, the chip-controlled USB switch provided by the present invention includes:

The USB male head is connected with the USB interface on the computer machine, and the USB male head has four USB3.0 signal pins and two USB2.0 signal pins;

The USB female head is connected with the USB interface of the USB3.0 device. The USB female head has four USB3.0 signal pins and two USB2.0 signal pins. The USB female head is connected to the USB male head. It is also connected through the positive pin of the power supply and the ground pin respectively;

A switching circuit, the switching circuit includes a selection chip, one end of the selection chip has a selection end, a first selected end, a second selected end, and a trigger end, and the pins of the selection end are respectively connected to the first selected end There is a one-to-one correspondence between the pins of the selected end and the second selected end, and when the trigger end receives the first level, each pin of the selected end is connected to each pin of the first selected end in one-to-one correspondence, and the trigger When the end receives the second level, each pin of the selection end is switched to be connected to each pin of the second selected end in one-to-one correspondence, and each pin of the selection end is connected to the four USB male heads in one-to-one correspondence. USB3.0 signal pins, two USB2.0 signal pins of the selector pins, the four pins of the first selected end corresponding to the positions of the four USB3.0 signal pins of the USB male head are also respectively The four USB3.0 signal pins of the USB female head are connected in one-to-one correspondence, and the two pins of the second selected end corresponding to the two USB2.0 signal pin positions of the USB male head are also respectively connected with The two USB2.0 signal pins of the USB female connector are connected in one-to-one correspondence, and the remaining pins of the first selected end and the second selected end are suspended.

Optionally, the switcher also has a voltage conversion circuit, which is respectively connected to the positive pin of the power supply and the ground pin, and the voltage conversion circuit is also connected to the selection chip to supply power to the selection chip.

Optionally, the switcher further includes a switch, an input end of which is selectively connected to the voltage conversion circuit or ground, and an output end is connected to the trigger end of the selection chip.

Optionally, the first level is a high level, and the second level is a low level.

Optionally, the selection chip is an ASM1445TQFN42 integrated circuit chip.

Compared with the prior art, the USB switch controlled by the chip of the present invention can change the level of the trigger end of the selection chip through the switching of the switch, and the selection chip selects the one connected to the selection end. The first selected end or the second selected end, so that the computer machine and the USB3.0 device can be connected to the USB2.0 signal pin or the USB3.0 signal pin, so that Respectively achieve the function of the USB3.0 device working in USB2.0 or USB3.0 state to test the computer machine. It can be seen that using one USB3.0 device can achieve the test of the two functions of the computer machine, reducing the number of test equipment; at the same time, avoiding the plugging damage caused by the multiple plugging and unplugging of the two USB devices, and the operation Save trouble and save man-hours.

【Description of drawings】

FIG. 1 is a schematic diagram of the application structure of a preferred embodiment of the chip-controlled USB switch of the present invention.

FIG. 2 is a schematic structural diagram of a preferred embodiment of the chip-controlled USB switch of the present invention.

【Detailed ways】

Please refer to FIG. 1 and FIG. 2 in combination. FIG. 1 shows a schematic diagram of an application structure of a preferred embodiment of a chip-controlled USB switch of the present invention, and FIG. 2 shows a chip-controlled USB switch of the present invention. Schematic diagram of the preferred embodiment.

In order to achieve the above purpose, the present invention provides a chip-controlled USB switcher, the switcher 100 includes:

The USB male head 101 is connected with the USB interface 201 on the computer machine 200 (such as a notebook computer, which is not limited to this, and can be other electronic products to be tested), and the USB male head 101 has four USB3. 0 signal pins 103~106, two USB2.0 signal pins 115~116;

The USB female head 102 is cooperatively connected with the USB interface 301 of the USB3.0 device 300 (which can be a U disk), and the USB female head 102 has four USB3.0 signal pins 107-110, two USB2.0 signal pins Pins 111-112, the USB female connector 102 and the USB male connector 101 are also respectively connected through the positive power pin 113 (which can be 5V) and the ground pin 114;

Switching circuit 103, the switching circuit 103 includes a selection chip, one end of the selection chip has a selection terminal, a first selected terminal, a second selected terminal, and a trigger terminal, and the selection terminal (DA0+, DA0-, DA1+ , DA1-, DA2+, DA2-, DA3+, DA3-) pins are respectively connected with the pins (DB0+, DB0-, DB1+, DB1-, DB2+, DB2-, DB3+, DB3-) of the first selected end, The pins (DC0+, DC0-, DC1+, DC1-, DC2+, DC2-, DC3+, DC3-) of the second selected end correspond one to one, and when the trigger end (SEL) receives the first level, each of the selected ends The pins are connected to each pin of the first selected end in one-to-one correspondence (DAx=DBx), and when the trigger end receives the second level, each pin of the selected end is switched to be connected to the second selected end. Each pin is connected in one-to-one correspondence (DAx=DCx), and each pin of the selection terminal is connected to the four USB3.0 signal pins 103-106 and two USB2.0 signal pins of the USB male head 101 in one-to-one correspondence 115～116 (the remaining pins DA3+, DA3- are suspended), the first selected end corresponds to the four pins (DB0+, DB0- , DB1+, DB1-) are also connected with the four USB3.0 signal pins 107~110 of the USB female 102 in one-to-one correspondence with 107~110, and the second selected end corresponds to the USB male 101 two The two pins (DC2+, DC2-) at the positions of the USB2.0 signal pins 115-116 are also connected to the two USB2.0 signal pins 111-112 of the USB female head 102 in one-to-one correspondence. The remaining pins of the first selected end and the second selected end are suspended.

Wherein, the switcher 100 can also have a voltage conversion circuit 117, which is respectively connected to the positive power pin 113 and the ground pin 114, and the voltage conversion circuit 117 is also connected to the power terminal of the selection chip, for all Select the chip power supply as described above.

Wherein, the switcher 100 may further include a switch 118, the input terminal of the switch 118 is selectively connected to the voltage conversion circuit 117 or ground, and the output terminal is connected to the trigger terminal of the selection chip.

Wherein, the first level may be a high level, and the second level may be a low level.

Wherein, the selection chip may be an ASM1445TQFN42 integrated circuit chip.

Utilize the USB switcher controlled by the chip of the present invention, through the switching of the switch 118, change the level of the trigger terminal of the selection chip, and the selection chip selects the first selected terminal connected to the selection terminal Or the second selected end, so that the computer machine 200 and the USB3.0 device 300 can be connected to the USB2.0 signal pin or the USB3.0 signal pin, so as to respectively achieve the The function of the USB3.0 device 300 working in the state of USB2.0 or USB3.0 is to test the computer machine 200 . It can be seen that the two functions of the computer machine 200 can be tested by using one USB3. As well as the trouble in operation, it saves man-hours.

It should be pointed out that the present invention is not limited to the above-mentioned embodiments, and any simple modifications, equivalent changes and modifications made to the above-mentioned embodiments by any skilled person based on the technical solutions of the present invention fall within the protection scope of the present invention.

Claims (5)

1. A chip-controlled USB switcher, characterized in that it comprises: The USB male head is connected with the USB interface on the computer machine, and the USB male head has four USB3.0 signal pins and two USB2.0 signal pins; The USB female head is connected with the USB interface of the USB3.0 device. The USB female head has four USB3.0 signal pins and two USB2.0 signal pins. The USB female head is connected to the USB male head. It is also connected through the positive pin of the power supply and the ground pin respectively; A switching circuit, the switching circuit includes a selection chip, one end of the selection chip has a selection end, a first selected end, a second selected end, and a trigger end, and the pins of the selection end are respectively connected to the first selected end There is a one-to-one correspondence between the pins of the selected end and the second selected end, and when the trigger end receives the first level, each pin of the selected end is connected to each pin of the first selected end in one-to-one correspondence, and the trigger When the end receives the second level, each pin of the selection end is switched to be connected to each pin of the second selected end in one-to-one correspondence, and each pin of the selection end is connected to the four USB male heads in one-to-one correspondence. USB3.0 signal pins, two USB2.0 signal pins, the four pins corresponding to the four USB3.0 signal pin positions of the USB male head of the first selected end are also connected to the USB female The four USB3.0 signal pins of the head are connected in one-to-one correspondence, and the two pins of the second selected end corresponding to the two USB2.0 signal pin positions of the USB male head are also respectively connected to the USB female head The two USB2.0 signal pins are connected in one-to-one correspondence, and the remaining pins of the first selected end and the second selected end are suspended. 2. The chip-controlled USB switcher as claimed in claim 1, characterized in that, the switcher also has a voltage conversion circuit, which is respectively connected to the positive pin of the power supply and the ground pin, and the voltage conversion circuit also has a voltage conversion circuit. It is connected with the selection chip and supplies power to the selection chip. 3. The chip-controlled USB switcher according to claim 2, wherein the switcher also includes a switch, the input end of the switcher is selected to be connected to the voltage conversion circuit or ground, and the output end is connected to the Select the trigger terminal of the chip. 4. The chip-controlled USB switch according to claim 1, wherein the first level is a high level, and the second level is a low level. 5. The chip-controlled USB switch according to any one of claims 1-4, wherein the selection chip is an ASM1445TQFN42 integrated circuit chip.