CN202798652U - Signal conversion circuit and interface switching equipment - Google Patents
Signal conversion circuit and interface switching equipment Download PDFInfo
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- CN202798652U CN202798652U CN 201220304252 CN201220304252U CN202798652U CN 202798652 U CN202798652 U CN 202798652U CN 201220304252 CN201220304252 CN 201220304252 CN 201220304252 U CN201220304252 U CN 201220304252U CN 202798652 U CN202798652 U CN 202798652U
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Abstract
The utility model discloses a signal conversion circuit and interface switching equipment. The signal conversion circuit comprises an interface conversion chip used for performing conversion between two protocol types of communication signals and two communication interfaces connected with two sets of interfaces of the interface conversion chip in a one-to-one correspondence way; wherein the first set of interfaces of the interface conversion chip comprise a receiving terminal and a transmitting terminal, on one hand, the receiving terminal is connected with a reference power supply through a first resistor, on the other hand, the receiving terminal is connected with an anode of a diode, a cathode of the diode is connected with a receiving pin of a first communication interface; the transmitting terminal is connected with a transmitting pin of the first communication interface through a second resistor connected in series. The signal conversion circuit of the utility model can be compatible with and can support different voltage states for one protocol type of communication signal on the basis of satisfying requirements of mutual conversion between the two protocol types of communication signals, therefore, the interface switching equipment designed from this has the advantages of high compatibility, convenient management, and safe use.
Description
Technical field
The utility model belongs to signal switch technology field, specifically, relate to a kind of signal for two kinds of protocol types, realize from the rough set theory circuit between the signal of another type of one type signal to two kind of different voltages and the interface interconnecting device that adopts described signaling conversion circuit design.
Background technology
For the present portable terminal products such as mobile phone, all be to communicate by the PC of UART signal with the outside mostly, to finish PC to debugging and the production test task of mobile phone in house software program.And for PC, then mostly adopt USB interface to realize the communication that is connected with ancillary equipment.Therefore, in order to satisfy the communicating requirement between portable terminal and the PC, a kind of signaling conversion circuit of needs design is realized the bi-directional conversion between usb signal and the UART signal.
Yet, the portable terminals such as the mobile phone of industry, the cpu chip that it is inner selected, the UART signal of the support 1.8V that has, the UART signal of the support 3.3V that has.In order to satisfy dissimilar cpu chips to the voltage request of UART signal, at present the traditional solution of industry is to make two kinds of different interface interconnecting devicies, finish respectively usb signal to the conversion between the UART signal of 1.8V and usb signal to the conversion between the UART signal of 3.3V.
Because prior art is to make respectively two kinds of different interface interconnecting devicies to finish the conversion of the UART signal of two kinds of different voltages, thus can exist should not manage, use inconvenience, obscure easily, the problem such as cost increase.And in case obscure use in the debugging of the software program of portable terminal or production test procedure, gently then can cause between portable terminal and the PC can't proper communication; Heavy then the batch incidents that also might cause the cpu chip of portable terminal inside to burn.Therefore, buried potential safety hazard for production and the debugging of portable terminal product.
Summary of the invention
The purpose of this utility model is to provide a kind of signaling conversion circuit, to realize by the rough set theory between a kind of communication signal of another protocol type of communication signal to two kind of different voltage statuss of protocol type, thereby make things convenient for the integration of docking port interconnecting device, improve the compatibility of interface interconnecting device.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of signaling conversion circuit comprises a two-way communication interface that is used for the interface conversion chip change and connects one to one with two group interfaces of described interface conversion chip between the communication signal of two kinds of protocol types; In the first group interface of described interface conversion chip, include and receive terminal and send terminal, wherein, described reception terminal connects reference power source by the first resistance on the one hand, the anode that connects on the other hand a diode, the negative electrode of described diode connects the reception pin of first via communication interface; Described transmission terminal connects the transmission pin of first via communication interface by the second resistance of series connection.
Further, the signal that transmits by described first via communication interface comprises two kinds of voltage statuss, and its amplitude is respectively V1, V2, and V1〉V2; The magnitude of voltage of described reference power source equals V1.
Further again, the interface voltage of the first group interface of described interface conversion chip equals V1, namely receives and send the communication signal that voltage status is V1.
Further, the low level decision threshold of described interface conversion chip is greater than the forward conduction voltage drop of described diode; The high level decision threshold of described interface conversion chip is less than forward conduction voltage drop and the V2 sum of described diode.
Preferably, described interface conversion chip preferably adopts a UART-USB interface conversion chip, its described first group interface transmission UART signal, by described diode be connected resistance and connect UART interface (being first via communication interface); Its second group interface transmission usb signal connects USB interface (i.e. the second road communication interface).
Further, the UART signal by described UART interface transmission comprises 3.3V and two kinds of voltage statuss of 1.8V; The magnitude of voltage of described reference power source equals 3.3V; The interface voltage of the first group interface of described interface conversion chip equals 3.3V.
Preferably, the power supply terminal of described interface conversion chip connects the 5V power supply, the 5V power supply is converted to the reference power source output of 3.3V.
In order to simplify the assembling structure of signaling conversion circuit, described 5V power supply is preferably introduced from the outside by the power pins of USB interface, thus, can avoid arranging separately power supply in signaling conversion circuit, with the design of convenient follow-up interface interconnecting device.
Preferably, the low level decision threshold of described interface conversion chip equals 0.8V, and the high level decision threshold equals 2V; The forward conduction voltage drop of described diode is 0.5V.
Structural design based on above-mentioned signaling conversion circuit, the utility model also provides a kind of interface interconnecting device that adopts the design of described signaling conversion circuit, comprises a two-way communication interface that is used for the interface conversion chip changed and connects one to one with two group interfaces of described interface conversion chip between the communication signal of two kinds of protocol types; In the first group interface of described interface conversion chip, include and receive terminal and send terminal, wherein, described reception terminal connects reference power source by the first resistance on the one hand, the anode that connects on the other hand a diode, the negative electrode of described diode connects the reception pin of first via communication interface; Described transmission terminal connects the transmission pin of first via communication interface by the second resistance of series connection.By between the first group interface of interface conversion chip and first via communication interface, setting up diode and the second resistance, the communication signal of same protocol type that thus can be by two kinds of voltage statuss of first via communication interface transmission.
Compared with prior art, advantage of the present utility model and good effect are: the utility model utilizes an interface conversion chip to cooperate simple peripheral circuit to make up the signaling conversion circuit that forms, on the basis that the mutual conversion between the communication signal that satisfies two kinds of protocol types requires, can also compatiblely support different voltage statuss for the communication signal of a certain protocol type, for example can realize the rough set theory of the UART signal of UART signal from the usb signal to 1.8V and 3.3V.Thus one, only need to make a kind of interface interconnecting device and can finish signal convert task between the UART slave of usb host and different voltage statuss, not only made things convenient for equipment control, reduced design cost, and can not occur owing to obscuring of interface interconnecting device use the UART slave cause to burn or can't proper communication etc. the generation of problem, guaranteed UART slave Operation safety.
After reading by reference to the accompanying drawings the detailed description of the utility model execution mode, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the schematic block circuit diagram of a kind of embodiment of the interface interconnecting device that proposes of the utility model;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of the signaling conversion circuit that proposes of the utility model.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
Present embodiment is in order to satisfy from the conversion requirement between a kind of communication signal of another protocol type of communication signal to two kind of different voltage statuss of protocol type, at first select a suitable interface conversion chip according to the communication signal of two kinds of protocol types, with the mutual conversion between the communication signal that is implemented in two kinds of protocol types.Secondly, on the basis of described interface conversion chip for a group interface that requires to transmit two kinds of different voltage statuss (for example the first group interface), one group of match circuit of specialized designs is to satisfy same protocol type but the compatible transmission requirement of the different two paths of signals of voltage status.Specifically, the reception terminal of the first group interface can be connected with a pull-up circuit with the anode of a diode respectively, and connect the reception pin of first via communication interface by the negative electrode of described diode; Wherein, described pull-up circuit can cooperate reference power source to connect realization by the first resistance.Then, the transmission pin that the transmission terminal in the first group interface of interface conversion chip is connected first via communication interface by the second resistance of series connection.
Suppose may have two kinds of voltage statuss of V1, V2 by the communication signal of described first via communication interface transmission, and V1 V2, the amplitude that described reference power source then is set equals V1, and option interface voltage is the interface conversion chip of V1.When the voltage status of the signal source that connects first via communication interface is V1, the communication signal that then sends by signal source transfers to the negative electrode of described diode via the reception pin of first via communication interface, when the signal that sends when signal source is high level, be that level equals V1, because the voltage at diode two ends is V1, then diode is in off state, and the reception terminal that utilizes reference power source to put the interface conversion chip is high level.When the signal that sends when signal source is low level, be that level equals 0V, because the anode voltage of diode is V1, then diode is in conducting state, and then drag down the current potential of the reception terminal of interface conversion chip, make its forward conduction voltage drop that equals described diode, the low level decision threshold by the interface conversion chip is set can realize that greater than the forward conduction voltage drop of described diode the interface conversion chip receives the accurate identification of signal to low level.This shows that the level state of the communication signal that the level state that receives by the interface conversion chip just sends with signal source conforms to.Be the transmitted signal of V1 for the voltage status by interface conversion chip output, then can directly export the signal source of outside by the second resistance of series connection via the transmission pin of first via communication interface to.
In like manner, when the voltage status of the signal source that connects first via communication interface is V2, the communication signal that then sends by signal source transfers to the negative electrode of described diode via the reception pin of first via communication interface, when the signal that sends when signal source is high level, be that level equals V2, because the cathode voltage of diode is V2, anode voltage is V1, and V1〉V2, then diode enters conducting state, the current potential of the reception terminal of interface conversion chip is limited on the forward conduction voltage drop of V2+ diode, high level decision threshold by the interface conversion chip is set can realize that less than the forward conduction voltage drop of described V2+ diode the interface conversion chip receives the accurate identification of signal to high level.When the communication signal that sends when signal source is low level, i.e. 0 level is because the anode voltage of diode is V1, cathode voltage equals 0, then diode is in conducting state, and then the current potential of reception terminal that drags down the interface conversion chip makes it become low level to the forward conduction voltage drop of diode.Thus one, the level state of the communication signal that the level state that receives by the interface conversion chip just sends with signal source conforms to.Be the transmitted signal of V1 for the voltage status by interface conversion chip output, then can utilize described the second resistance to produce the pressure drop of V1-V2, and then so that be the transmitted signal of V2 via the transmission pin output voltage state of first via communication interface, satisfying the reception requirement of signal source, and realize that the level state that signal source receives just conforms to the level state that the interface conversion chip sends.
Therefore, adopt the design of present embodiment, utilize an interface conversion chip can satisfy communication signal from a kind of protocol type to the bi-directional conversion requirement the communication signal of two kinds of voltage statuss of another protocol type, greatly improve the compatibility of signaling conversion circuit, expanded the suitable application area of signaling conversion circuit.
The UART signal that following present embodiment becomes the UART signal of 1.8V and 3.3V take the usb signal rough set theory is as example, at length sets forth to described signaling conversion circuit and based on concrete assembling structure and the operation principle thereof of the interface interconnecting device of described signaling conversion circuit design.
USB is the english abbreviation of English Universal Serial Bus, and namely USB is an external bus standard, is used for being connected and communication of standard computer and external equipment, is the interfacing that is applied in the PC field.
UART is a kind of general serial data/address bus, is used for asynchronous communication.This bus two-way communication can realize the full duplex sending and receiving.In the embedded design of the portable terminals such as mobile phone, usually adopt the UART interface to come to communicate with outside PC, also can carry out data interaction with monitoring debugger and other device (such as EEPROM etc.).
In order to satisfy the signal and communication requirement between usb signal source and the UART signal source, need a kind of USB-UART interface interconnecting device of design to be connected between two signal sources, with the mutual conversion between the communication signal of realizing two kinds of protocol types.Referring to shown in Figure 1, in described interface interconnecting device, include a USB interface, a UART interface and be connected to two signaling conversion circuits between the interface.By described signaling conversion circuit is carried out Design of Compatibility, can realize thus UART signal compatibility 1.8V and two kinds of voltage statuss of 3.3V by the transmission of UART interface.
Take the usb signal source as PC, the UART signal source is that the cpu chip of interior of mobile phone is that example describes.When the cpu chip that utilizes PC to interior of mobile phone carries out software program debugging or production test, the usb segment of interface interconnecting device shown in Figure 1 is plugged on the USB interface of PC, the UART interface section of interface interconnecting device is plugged on the UART interface of mobile phone cpu chip.Because described interface interconnecting device can compatible 1.8V and the transmission of the UART signal of two kinds of voltage statuss of 3.3V, therefore, no matter cpu chip to be tested is the UART signal of supporting the UART signal of 1.8V or supporting 3.3V, utilize a described interface interconnecting device all can satisfy communicating requirement between itself and the PC, debugging, test job have not only been made things convenient for, and fundamentally stopped owing to selected interface interconnecting device do not mate that the cpu chip that causes burns or can't proper communication etc. the generation of problem, conscientiously ensured the fail safe of mobile phone test.
Fig. 2 is the schematic diagram of described signaling conversion circuit, and wherein, U1 is a UART-USB interface conversion chip; R10 is described the first resistance, is connected to form pull-up circuit with the reference power source VDD_3V3 of 3.3V, connects the reception terminal RXD of UART-USB interface conversion chip U1; D1 is described diode, is connected between the reception pin RX of the reception terminal RXD of described UART-USB interface conversion chip U1 and UART interface; R12 is described the second resistance, is connected between the transmission pin TX of the transmission terminal TXD of described UART-USB interface conversion chip U1 and UART interface.Described reception terminal RXD and transmission terminal TXD namely consist of the first group interface of UART-USB interface conversion chip U1, be used for transmission UART signal, and interface voltage are 3.3V.
Among Fig. 2, DP, the DM terminal of UART-USB interface conversion chip U1 namely consist of the second group interface, connect USB interface by a pair of differential signal line, are used for the transmission usb signal.Preferably the power pins Vbus by USB interface is provided by the PC of outside for the required 5V DC power supply of UART-USB interface conversion chip U1 work, transfer to the power supply terminal VDD of UART-USB interface conversion chip U1, when satisfying UART-USB interface conversion chip U1 need for electricity, utilize the inner integrated pressurizer of UART-USB interface conversion chip U1 that the reference power source VDD_3V3 that the 5V DC power supply converts 3.3V to is exported, to satisfy the request signal transmission of the first group interface.
The operation principle of signaling conversion circuit shown in Figure 2 is:
1, supports the situation of the UART signal of 3.3V for the cpu chip of interior of mobile phone
(1) with regard to the reception path RXD of UART-USB interface conversion chip U1
When the UART signal of mobile phone transmission is high level, when being 3.3V, the cathode voltage of diode D1 is 3.3V and since the anode of diode D1 by resistance R 10 by on move 3.3V to, so not conducting of diode D1, the voltage of the reception terminal RXD of UART-USB interface conversion chip U1 remains 3.3V.The high level decision threshold of setting UART-USB interface conversion chip U1 equals 2V, and then this moment, UART-USB interface conversion chip U1 judged that the UART signal that receives is high voltage, and the signal that sends with mobile phone conforms to.
When the UART signal of mobile phone transmission is low level, about 0V, then the cathode voltage of diode D1 is about 0V, anode voltage by resistance R 10 by on move 3.3V to, so diode D1 conducting, the voltage of the reception terminal RXD of UART-USB interface conversion chip U1 is clamped on the forward conduction voltage drop of diode D1, namely about 0.5V.The low level decision threshold of setting UART-USB interface conversion chip U1 equals 0.8V, and then this moment, UART-USB interface conversion chip U1 judged that the UART signal that receives is low-voltage, and the signal that sends with mobile phone conforms to.
(2) with regard to the transmission path TXD of UART-USB interface conversion chip U1
When the UART signal that sends as UART-USB interface conversion chip U1 is high level, about 3.3V, then pass through resistance R 12 after, the receiver voltage of corresponding mobile phone terminal is 3.3V, i.e. high level, the pressure drop on the resistance R 12 is about 0V, electric current is very little.
When the UART signal of UART-USB interface conversion chip U1 transmission is low level, about 0V, then by after the resistance R 12, the receiver voltage of corresponding mobile phone terminal is 0V, i.e. low level.
The reception signal of having realized thus mobile phone conforms to the transmitted signal of UART-USB interface conversion chip U1.
2, support the situation of the UART signal of 1.8V for the cpu chip of interior of mobile phone
(1) with regard to the reception path RXD of UART-USB interface conversion chip U1
When the UART signal of mobile phone transmission is high level, when being 1.8V, the cathode voltage of diode D1 is 1.8V and since the anode of diode D1 by resistance R 10 by on move 3.3V to, pressure reduction between anode and the negative electrode satisfies the turn-on condition of diode, so diode D1 conducting.Because the forward conduction voltage drop of diode D1 is about 0.5V, therefore so that the voltage of the reception terminal RXD of UART-USB interface conversion chip U1 is clamped at 2.3V(1.8V+0.5V).Because the high level decision threshold 2V that 2.3V sets greater than UART-USB interface conversion chip U1, so UART-USB interface conversion chip U1 judges that the UART signal that receives still is high voltage, conforms to the signal of mobile phone transmission.At this moment, the pressure drop on the resistance R 10 is 1.0V(3.3V-2.3V), be the resistance R 10 of 220K Ω if select resistance, the electric current that then receives path is 4.5uA(1/220K), can satisfy the requirement of the UART signal high level of 1.8V fully.
When the UART signal of mobile phone transmission is low level, about 0V, then the cathode voltage of diode D1 is about 0V, anode voltage by resistance R 10 by on move 3.3V to, so diode D1 conducting, so that the voltage of the reception terminal RXD of UART-USB interface conversion chip U1 is clamped on the forward conduction voltage drop of diode D1, namely about 0.5V.Because the low level decision threshold 0.8V that 0.5V sets less than UART-USB interface conversion chip U1, then this moment, UART-USB interface conversion chip U1 judged that the UART signal that receives is low-voltage, and the signal that sends with mobile phone conforms to.
(2) with regard to the transmission path TXD of UART-USB interface conversion chip U1
When the UART signal of UART-USB interface conversion chip U1 transmission is high level, about 3.3V, because the high level of mobile phone receiving terminal is 1.8V, so the pressure drop of 1.5V is arranged in resistance R 12, the resistance of setting resistance R 12 is 1K Ω, then the electric current of transmission path is 1.5mA(1.5V/1K), can satisfy the reception requirement of mobile phone side fully.By increasing resistance R 12, cpu chip that can adversary's pusher side is protected, and prevents to burn the situation of interior of mobile phone cpu chip.
When the UART signal of UART-USB interface conversion chip U1 transmission is low level, about 0V, then by after the resistance R 12, the receiver voltage of corresponding mobile phone terminal is 0V, i.e. low level.
The reception signal of having realized thus mobile phone conforms to the transmitted signal of UART-USB interface conversion chip U1.
On the basis of the interface conversion chip of present embodiment by being converted to 3.3V UART signal at usb signal, increase the diode D1 of a 0.5V pressure drop and the resistance R 12 of a 1K Ω, thereby realized that usb signal is to the rough set theory of the UART signal of the UART signal of 1.8V and 3.3V.The interface interconnecting device of design is compatible strong thus, is easy to management, and safe and convenient to use, cost is low.
Certainly, the signaling conversion circuit that present embodiment proposes is equally applicable to the mutual conversion between the communication signal of other two kinds of protocol types, and such as RS232-USB etc., present embodiment does not specifically limit this.
Should be noted that; the above only is a kind of preferred implementation of the present utility model; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1. signaling conversion circuit is characterized in that: comprise a two-way communication interface that is used for the interface conversion chip changed and connects one to one with two group interfaces of described interface conversion chip between the communication signal of two kinds of protocol types; In the first group interface of described interface conversion chip, include and receive terminal and send terminal, wherein, described reception terminal connects reference power source by the first resistance on the one hand, the anode that connects on the other hand a diode, the negative electrode of described diode connects the reception pin of first via communication interface; Described transmission terminal connects the transmission pin of first via communication interface by the second resistance of series connection.
2. signaling conversion circuit according to claim 1 is characterized in that: the signal by described first via communication interface transmission comprises two kinds of voltage statuss, and its amplitude is respectively V1, V2, and V1〉V2; The magnitude of voltage of described reference power source equals V1.
3. signaling conversion circuit according to claim 2, it is characterized in that: the interface voltage of the first group interface of described interface conversion chip equals V1.
4. signaling conversion circuit according to claim 3, it is characterized in that: the low level decision threshold of described interface conversion chip is greater than the forward conduction voltage drop of described diode; The high level decision threshold of described interface conversion chip is less than forward conduction voltage drop and the V2 sum of described diode.
5. each described signaling conversion circuit in 4 according to claim 1, it is characterized in that: described interface conversion chip is UART-USB interface conversion chip, its described first group interface transmission UART signal, by described diode be connected resistance and connect the UART interface; Its second group interface transmission usb signal connects USB interface.
6. signaling conversion circuit according to claim 5 is characterized in that: the UART signal by described UART interface transmission comprises 3.3V and two kinds of voltage statuss of 1.8V; The magnitude of voltage of described reference power source equals 3.3V; The interface voltage of the first group interface of described interface conversion chip equals 3.3V.
7. signaling conversion circuit according to claim 6 is characterized in that: the power supply terminal of described interface conversion chip connects the 5V power supply, and the 5V power supply is converted to the reference power source output of 3.3V.
8. signaling conversion circuit according to claim 7, it is characterized in that: described 5V power supply is introduced from the outside by the power pins of USB interface.
9. signaling conversion circuit according to claim 6, it is characterized in that: the low level decision threshold of described interface conversion chip equals 0.8V, and the high level decision threshold equals 2V; The forward conduction voltage drop of described diode is 0.5V.
10. an interface interconnecting device is characterized in that: comprise such as the described signaling conversion circuit of each claim in the claim 1 to 9.
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| CN 201220304252 CN202798652U (en) | 2012-06-27 | 2012-06-27 | Signal conversion circuit and interface switching equipment |
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| CN 201220304252 CN202798652U (en) | 2012-06-27 | 2012-06-27 | Signal conversion circuit and interface switching equipment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016107033A1 (en) * | 2014-12-31 | 2016-07-07 | 小米科技有限责任公司 | Electronic device and data transmission system |
| US9984030B2 (en) | 2014-12-31 | 2018-05-29 | Xiaomi Inc. | Electronic device and data transmission system |
| CN110350906A (en) * | 2018-04-04 | 2019-10-18 | 立锜科技股份有限公司 | Interface control circuit |
| CN112365636A (en) * | 2020-10-30 | 2021-02-12 | 深圳坚朗海贝斯智能科技有限公司 | Intelligent lock management system based on mobile intelligent terminal and working method thereof |
| CN117075752A (en) * | 2023-08-15 | 2023-11-17 | 杭州凡诺电子有限公司 | Data conversion method and device and electronic equipment |
-
2012
- 2012-06-27 CN CN 201220304252 patent/CN202798652U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016107033A1 (en) * | 2014-12-31 | 2016-07-07 | 小米科技有限责任公司 | Electronic device and data transmission system |
| US9984030B2 (en) | 2014-12-31 | 2018-05-29 | Xiaomi Inc. | Electronic device and data transmission system |
| CN110350906A (en) * | 2018-04-04 | 2019-10-18 | 立锜科技股份有限公司 | Interface control circuit |
| CN112365636A (en) * | 2020-10-30 | 2021-02-12 | 深圳坚朗海贝斯智能科技有限公司 | Intelligent lock management system based on mobile intelligent terminal and working method thereof |
| CN117075752A (en) * | 2023-08-15 | 2023-11-17 | 杭州凡诺电子有限公司 | Data conversion method and device and electronic equipment |
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