CN109284249A - A kind of usb interface module circuit - Google Patents
A kind of usb interface module circuit Download PDFInfo
- Publication number
- CN109284249A CN109284249A CN201811358126.0A CN201811358126A CN109284249A CN 109284249 A CN109284249 A CN 109284249A CN 201811358126 A CN201811358126 A CN 201811358126A CN 109284249 A CN109284249 A CN 109284249A
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- Prior art keywords
- feet
- capacitor
- interface module
- usb interface
- connect
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- 239000003990 capacitor Substances 0.000 claims abstract description 35
- 239000013078 crystal Substances 0.000 claims description 12
- 238000004891 communication Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0042—Universal serial bus [USB]
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Information Transfer Systems (AREA)
Abstract
The invention discloses a kind of usb interface module circuits, it is characterized by: including CH340T chip U4001,5 feet of U4001 connect the one end capacitor C4006, the capacitor C4006 other end connects USBGND, 6,7 feet of U4001 are separately connected UBSDATA+ and UBSDATA- signal, 8,9,10 feet of U4001 connect clock circuit, one end of the 19 feet connection capacitor C4010 of U4001, the other end of capacitor C4010 connects USBGND, one end of the 20 feet connection resistance R4000 of U4001, the other end of resistance R4000 connect USBGND.The present invention has been provided out the nine kinds of needles full signal TTL serial port of standard or has met the SIR infrared-ray communication of Ir DA specification, and circuit structure is simple and works well.
Description
Technical field
The present invention relates to a kind of interface module circuit, especially a kind of usb interface module circuit.
Background technique
USB (Universal Serial Bus) be by 7 company such as Compaq, IBM, Intel, Microsoft in
Nineteen ninety-five researches and develops and standardizes out.Relative to conventional peripheral interface, USB has many characteristics and advantages: having unified various
The connector of interface equipment, plug and play (plug and play) characteristic；" hot plug " characteristic；Have 1.5Mbps, 12Mbps,
The transmission rates such as 480Mbps (USB 2.0)；It at most can connect 127 equipment；It can be powered by USB cable without additional
Power supply；With power management function.
The bus structures of USB are to contain two kinds of USB equipment using the star-shaped topological structure of staged:
Usb hub and USB device.It is USB Host(host side positioned at top).Online from Host is connected to down
Hub(hub), then extended away down in a manner of one layer or single order by hub by staged, is connected to next layer and sets
On standby or another hub.One equipment can be used as USB equipment and usb host simultaneously.Therefore many equipment are all adopted at present
With USB interface, but since not all equipment all uses USB interface, still there is equipment component to connect using serial ports etc.
Mouthful, this, which just needs to carry out USB interface conversion, could use USB device.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of usb interface module circuits, for converting USB interface and string
Mouthful.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of usb interface module circuit, it is characterised in that: 5 feet comprising CH340T chip U4001, U4001 connect capacitor
The one end C4006, the capacitor C4006 other end connect USBGND, and 6,7 feet of U4001 are separately connected UBSDATA+ and UBSDATA- letter
Number, 8,9,10 feet of U4001 connect clock circuit, and one end of the 19 feet connection capacitor C4010 of U4001, capacitor C4010's is another
One end of the 20 feet connection resistance R4000 of end connection USBGND, U4001, the other end of resistance R4000 connect USBGND.
Further, the clock circuit includes crystal oscillator X4000, capacitor C4008 and capacitor C4009.
Further, 9 feet connection one end crystal oscillator X4000 and the one end capacitor C4008 of the U4001,10 feet of U4001 connect
The crystal oscillator X4000 other end and the one end capacitor C4009 are connect, the capacitor C4008 other end connects the 8 of U4001 with the capacitor C4009 other end
Foot.
Further, the frequency of the crystal oscillator X4000 is 12MHz.
Further, 2 feet of the U4001 export ACT signal, and 3 feet of U4001 export TXD signal, and 4 feet of U4001 are defeated
Enter RXD signal.
Further, 11,12,13,14 feet of the U4001 input CTS, DSR, RI, DCD signal respectively, U4001's
15,16 feet export DTR and RTS signal respectively.
Compared with prior art, the present invention having the following advantages that and effect: usb interface module circuit of the invention uses
USB To Serial interface chip CH340, the complete USB bottom layer driving of built-in chip type, has been provided out the nine of standard
Needle full signal TTL serial port or the SIR infrared-ray communication for meeting Ir DA specification, circuit structure is simple and works well.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of usb interface module circuit of the invention.
Specific embodiment
Below by embodiment, the present invention is described in further detail, following embodiment be explanation of the invention and
The invention is not limited to following embodiments.
As shown in Figure 1, a kind of usb interface module circuit of the invention, includes 5 feet of CH340T chip U4001, U4001
Connect the one end capacitor C4006, the capacitor C4006 other end connect USBGND, 6,7 feet of U4001 be separately connected UBSDATA+ and
UBSDATA- signal, 8,9,10 feet of U4001 connect clock circuit, one end of the 19 feet connection capacitor C4010 of U4001, capacitor
The other end of C4010 connects USBGND, one end of the 20 feet connection resistance R4000 of U4001, the other end connection of resistance R4000
USBGND。
Clock circuit includes crystal oscillator X4000, capacitor C4008 and capacitor C4009.9 feet of U4001 connect crystal oscillator X4000 mono-
End and the one end capacitor C4008, the 10 feet connection crystal oscillator X4000 other end and the one end capacitor C4009, capacitor C4008 of U4001 are another
End connects 8 feet of U4001 with the capacitor C4009 other end.The frequency of crystal oscillator X4000 is 12MHz.
2 feet of U4001 export ACT signal, and 3 feet of U4001 export TXD signal, and 4 feet of U4001 input RXD signal.
11,12,13,14 feet of U4001 input CTS, DSR, RI, DCD signal respectively, and 15,16 feet of U4001 export DTR and RTS respectively
Signal.
The operation principle of the present invention is that: CH340 work periphery very simple, crystal X4000 of 12M in serial communication
Clock circuit is constituted with the load capacitance of C4009, C4008 composition, provides clock for CH340；There are two types of suppliers of electricity by CH340
Formula: in-line power and external power supply, we use external power supply, and pin " V3 " needs external filter capacitor C4006 at this time, with
Stable operating voltage is provided.The PC machine USB driving of chip have it is anti-forbid USB device to hang up function, can prevent PC machine into
Enter hang-up USB equipment when sleeping, function comes into force resistance R4000 over the ground by pin NOS.
Usb interface module circuit of the invention uses USB To Serial interface chip CH340, and built-in chip type is complete
Whole USB bottom layer driving, the SIR for being provided out the nine kinds of needles full signal TTL serial port of standard or having met Ir DA specification are red
Outside line communication, circuit structure is simple and works well.
Above content is only illustrations made for the present invention described in this specification.Technology belonging to the present invention
The technical staff in field can do various modifications or supplement or is substituted in a similar manner to described specific embodiment, only
It should belong to guarantor of the invention without departing from the content or beyond the scope defined by this claim of description of the invention
Protect range.
Claims (6)
1. a kind of usb interface module circuit, it is characterised in that: 5 feet comprising CH340T chip U4001, U4001 connect capacitor
The one end C4006, the capacitor C4006 other end connect USBGND, and 6,7 feet of U4001 are separately connected UBSDATA+ and UBSDATA- letter
Number, 8,9,10 feet of U4001 connect clock circuit, and one end of the 19 feet connection capacitor C4010 of U4001, capacitor C4010's is another
One end of the 20 feet connection resistance R4000 of end connection USBGND, U4001, the other end of resistance R4000 connect USBGND.
2. a kind of usb interface module circuit described in accordance with the claim 1, it is characterised in that: the clock circuit includes crystal oscillator
X4000, capacitor C4008 and capacitor C4009.
3. a kind of usb interface module circuit according to claim 2, it is characterised in that: 9 feet of the U4001 connect brilliant
Shake the one end X4000 and the one end capacitor C4008, the 10 feet connection crystal oscillator X4000 other end of U4001 and the one end capacitor C4009, capacitor
The C4008 other end connects 8 feet of U4001 with the capacitor C4009 other end.
4. a kind of usb interface module circuit according to claim 2, it is characterised in that: the frequency of the crystal oscillator X4000 is
12MHz。
5. a kind of usb interface module circuit described in accordance with the claim 1, it is characterised in that: 2 feet of the U4001 export ACT
Signal, 3 feet of U4001 export TXD signal, and 4 feet of U4001 input RXD signal.
6. a kind of usb interface module circuit described in accordance with the claim 1, it is characterised in that: the U4001 11,12,13,
14 feet input CTS, DSR, RI, DCD signal respectively, and 15,16 feet of U4001 export DTR and RTS signal respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811358126.0A CN109284249A (en) | 2018-11-15 | 2018-11-15 | A kind of usb interface module circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811358126.0A CN109284249A (en) | 2018-11-15 | 2018-11-15 | A kind of usb interface module circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109284249A true CN109284249A (en) | 2019-01-29 |
Family
ID=65175642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811358126.0A Pending CN109284249A (en) | 2018-11-15 | 2018-11-15 | A kind of usb interface module circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109284249A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204230559U (en) * | 2014-08-27 | 2015-03-25 | 皖西学院 | A kind of USB interface turns serial port device |
| CN108762461A (en) * | 2018-08-01 | 2018-11-06 | 郑州源创智控有限公司 | The USB power supply communication circuits of host are detected for grain feelings of powering |
-
2018
- 2018-11-15 CN CN201811358126.0A patent/CN109284249A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204230559U (en) * | 2014-08-27 | 2015-03-25 | 皖西学院 | A kind of USB interface turns serial port device |
| CN108762461A (en) * | 2018-08-01 | 2018-11-06 | 郑州源创智控有限公司 | The USB power supply communication circuits of host are detected for grain feelings of powering |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190129 |
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| RJ01 | Rejection of invention patent application after publication |