CN102170104B - Data exchange apparatus - Google Patents
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- CN102170104B CN102170104B CN201110072316.8A CN201110072316A CN102170104B CN 102170104 B CN102170104 B CN 102170104B CN 201110072316 A CN201110072316 A CN 201110072316A CN 102170104 B CN102170104 B CN 102170104B
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Abstract
The invention discloses a data exchange apparatus, which comprises a first electronic device and a second electronic device; the power output end of the first electronic device is connected with the power input end of the second electronic device through a power line; the data interface of the first electronic device is connected with the data interface of the second electronic device through a data line; an over-voltage protection unit conducted in one way is connected between the data interface of the second electronic device and the power input end in series; the data exchange apparatus further comprises a control unit; and the control unit is connected on the power line in series for stopping the signal conduction of the power line when the power output end of the first electronic device outputs low level or low voltage. The embodiment of the invention further provides another data exchange apparatus; each data exchange apparatus guarantees that the voltage on the data line is not lowered by the power line and guarantees that the data transmission apparatus and the data receiving apparatus have stable communication.
Description
Technical field
The present invention relates to electronic circuit technology field, be specifically related to a kind of switch and imaging data switching equipment.
Background technology
In electronic circuit technology field, often relate to the data communication problem between two or more different electronic installations, general solution is, consult Fig. 1, a kind of switch, comprise the first electronic installation, second electronic device, the connecting lines such as power line Vcc, clock line CLK, data wire DATA and ground wire GND are set between the first electronic installation and second electronic device, the first electronic installation and second electronic device are realized the exchanges data between stream oriented device by these connecting lines.
For example, syndeton shown in Fig. 1 is applied to the exchanges data between imaging device and imaging box chip, concrete structure as shown in Figure 2, imaging device and imaging box chip form an imaging data switching equipment by power line Vcc, clock line CLK, data wire DATA and ground wire GND, wherein ground wire GND is with reference to 0 current potential, V is power supply, and the data-interface P1 of the data wire DATA in imaging device is connected with internal electric source V by a pull-up resistor R1.The data-interface of the data wire DATA of imaging box chip inside and the input of power line Vcc are connected with an Overvoltage protecting unit, and this Overvoltage protecting unit has one-way conduction function, for example diode.When normal running, data-interface P1, P2 carry out two-way exchanges data by data wire DATA, in the time that P1 mouth is not carried out any data manipulation, are placed in high potential stable state by pull-up resistor R1; But also there will be the steep unpredictable situation increasing of voltage on DATA line; in the time that the voltage higher than on power line Vcc is a certain amount of; will conducting Overvoltage protecting unit; make the positive charge on data wire DATA flow to power line Vcc; and then reduced the voltage on data wire DATA, play the effect of overvoltage protection.
But, in the practical communication process of imaging device and imaging box chip, there will be imaging device control power line Vcc to be output as the situation of 0 current potential or low-voltage, again because the conduction impedance of Overvoltage protecting unit is very little, much smaller than the resistance of pull-up resistor R1, like this, easily cause current potential or voltage on data wire DATA to be pulled to 0 current potential or low-voltage; And the pre-efficient communication realizing between the two, it is too low that the current potential on data wire DATA or voltage can not be drawn by the voltage on power line Vcc.Therefore, if the imaging device structure shown in employing Fig. 2 is to realize the communication between imaging device and imaging box chip, easily cause exchanges data between imaging device and imaging box chip to be interrupted, and then cause the imaging device can not recognition imaging box chip, finally affect the imaging operation of imaging device.
Consult Fig. 3, imaging device except being connected by connecting lines such as clock line CLK, data wire DATA, ground wire GND, also comprises a power module V2 with imaging box chip, and wherein, power module V2 is the power module independently-powered to imaging box chip.Between the data-interface of imaging box chip and power module V2 output, be in series with an Overvoltage protecting unit, this Overvoltage protecting unit has one-way conduction function, for example diode.When normal running, P1, P2 carry out two-way exchanges data by DATA line, in the time that P1 mouth is not carried out any data manipulation, are placed in high potential stable state by pull-up resistor R1; But also there will be the steep situation about increasing of voltage on data wire DATA; in the time that the voltage on data wire DATA is a certain amount of higher than power module V2; at this moment will conducting Overvoltage protecting unit; make the positive charge on data wire DATA flow to power module V2; and then reduced the voltage on DATA line, play the effect of overvoltage protection.Certainly, V2 is except can, to imaging box chip is independently-powered, also can power to imaging box chip and imaging device simultaneously, and now the power supply V in imaging device has not just existed.Power module V2 can be independent of outside imaging device and imaging box chip, also can be integrated in imaging box chip, or be integrated in imaging device, is not described in detail at this.
But, in the data exchange process of imaging device and imaging cartridge, there will be the situation of power module V2 power-off, again because the conduction impedance of Overvoltage protecting unit is very little, much smaller than the resistance of pull-up resistor R1, easily like this cause current potential or voltage on data wire DATA to be pulled to 0 current potential or low-voltage; And wish realizes efficient communication between the two, must require the voltage on DATA line not change with the change in voltage of power module V2.Therefore, if the electric circuit construction described in employing Fig. 3 is to realizing the exchanges data between imaging device and imaging box chip, easily cause the exchanges data between imaging device and imaging box chip to be interrupted, and then cause the imaging device can not recognition imaging box, finally affect the consequence of the imaging operation of imaging device.
In the research and practice process to prior art, the present inventor finds, does not do too large variation on available data switching equipment, meets again the switch that the voltage on data wire DATA can not dragged down by the voltage on power line Vcc.
Summary of the invention
A kind of switch that the embodiment of the present invention provides the voltage on data wire can not dragged down by the voltage on power line.
A kind of switch, comprises the first electronic installation and second electronic device,
The power output end of the first electronic installation connects the power input of second electronic device by power line,
The data-interface of the first electronic installation connects the data-interface of second electronic device by data wire,
Between the data-interface of second electronic device and power input, be in series with the Overvoltage protecting unit of one-way conduction,
Described switch also comprises control unit, described control unit is connected on described power line, for when the power output end output low level of described the first electronic installation or the low-voltage, end the signal conduction of described power line, ensure that the voltage on data wire is not dragged down by power line.
Described control unit comprises, conducting direction is the one-way conduction element to the power input of second electronic device by the power output end of the first electronic installation.
Described one-way conduction element is diode.
Described control unit comprises trigistor, the switch terminals of described trigistor is connected on described power line, the control end reception control signal of described trigistor, described control signal is from the first electronic installation, second electronic device or external connected electronic device, in the time of the power output end output low level of described the first electronic installation or low-voltage, according to described control signal, control between described switch terminals and disconnect.
Described trigistor is triode.
Described control unit is arranged in described the first electronic installation or second electronic device.
Described the first electronic installation is imaging device, and described second electronic device is imaging box chip.
A kind of switch, comprises the first electronic installation, second electronic device and the power module that is independent of described the first electronic installation and second electronic device,
The data-interface of the first electronic installation connects the data-interface of second electronic device by data wire,
The power input of second electronic device connects the power output end of power module by power line,
Between the data-interface of second electronic device and power input, be in series with the Overvoltage protecting unit of one-way conduction; described switch also comprises control unit; described control unit is connected on described power line; for when the power output end output low level of described power module or the low-voltage; end the signal conduction of described power line, ensure that the voltage on data wire is not dragged down by power line.
Described low-voltage is the voltage of 0V left and right, and the voltage of 0V left and right is low level 0.
The embodiment of the present invention adopts control unit is arranged on the first electronic installation or second electronic device, or control unit is connected on power line Vcc.Due to the reverse cut-off characteristics of control unit, in the time that the output voltage of power line is low level or low-voltage, make the positive charge on data wire can not flow to power line, thereby avoid the voltage on data wire to occur because of the situation that the brownout on power line is dragged down, realized stability and the reliability of transfer of data.
Brief description of the drawings
Fig. 1 is switch circuit connection diagram in prior art;
Fig. 2 is embodiment mono-schematic diagram of exchanges data between imaging device in prior art;
Fig. 3 is embodiment bis-schematic diagrames of exchanges data between imaging device in prior art;
Fig. 4 is embodiment mono-switch conspectus provided by the invention;
Fig. 5 is the equipment schematic diagram of a kind of execution mode in embodiment mono-provided by the invention;
Fig. 6 is the equipment schematic diagram of another kind of execution mode in embodiment mono-provided by the invention;
Fig. 7 is the switch schematic diagram of embodiment bis-provided by the invention;
Fig. 8 is the switch schematic diagram of embodiment tri-provided by the invention;
Fig. 9 is the schematic diagram that switch provided by the invention is applied in imaging device;
Figure 10 is embodiment tetra-switch conspectuses provided by the invention;
Figure 11 is the equipment schematic diagram of a kind of execution mode in embodiment tetra-provided by the invention;
Figure 12 is the equipment schematic diagram of another kind of execution mode in embodiment tetra-provided by the invention;
Embodiment
The embodiment of the present invention provides a kind of switch, below is elaborated respectively.
Embodiment mono-:
Refer to Fig. 4; switch comprises the first electronic installation; second electronic device; power line Vcc; data wire DATA; clock line CLK and ground wire GND; can also comprise other connecting lines such as select lines; the power output end of the first electronic installation connects the power input of second electronic device by power line Vcc; the data-interface of the first electronic installation connects the data-interface of second electronic device by data wire DATA; between the data-interface of second electronic device and power input, be in series with the Overvoltage protecting unit of one-way conduction, as diode.Clock line CLK and ground wire GND two ends are connected on the first electronic installation and interface corresponding to second electronic device, a pull-up resistor R connects between the internal electric source V of the first electronic installation and data-interface, switch also comprises control unit, control unit is connected on power line Vcc, for when the power output end output low level of the first electronic installation or the low-voltage, oppositely end the signal conduction of power line Vcc.When the output voltage of power line Vcc is 0 or when electronegative potential, control unit cut-off, thus ensure that the voltage on data wire DATA can not dragged down by power line Vcc.
Refer to Fig. 5, the schematic diagram of a kind of execution mode of the embodiment of the present invention one, the control unit being connected in the present embodiment on power line Vcc is diode D2, the conducting direction of diode D2 is to second electronic device by the first electronic installation.In the time that the voltage on data wire DATA is a certain amount of higher than the voltage on power line Vcc, due to the reverse cut-off effect of diode D2, make not existed to the discharge loop of power line Vcc from data wire DATA.But in second electronic device, also have an overvoltage crowbar, when overvoltage, the positive charge on data wire DATA flows into the overvoltage crowbar in second electronic device, can play equally the effect of overvoltage protection.In the time that the output voltage on power line Vcc is normal, diode D2 normally.When the output voltage on power line Vcc is 0 or when too low, diode D2 oppositely ends.Thereby ensure that the voltage on data wire DATA is not dragged down by power line Vcc, ensured the first electronic installation and second electronic device stabilized communication.
Refer to Fig. 6, another execution mode schematic diagram of the embodiment of the present invention one, the control unit being connected on power line Vcc is triode T2, the switch terminals emitter and collector of triode T2 is connected on power line Vcc, the control end of triode T2 is base stage, control end receives the control signal of the first electronic installation, controls conducting and the cut-off of triode T2.In the time that the voltage on data wire DATA is a certain amount of higher than the voltage on power line Vcc, due to the reverse cut-off effect of triode T2, make not existed to the discharge loop of power line Vcc from data wire DATA.But in second electronic device, also have an overvoltage crowbar, when overvoltage, the positive charge on data wire DATA flows into the overvoltage crowbar in second electronic device, can play equally the effect of overvoltage protection.The specific works principle of connection triode T2 is, triode T2 receives the control signal of the first electronic installation, and in the time that the voltage of control end base stage is 0, power line Vcc normally works, triode T2 conducting; When the output voltage of power line Vcc is 0 or when too low, triode T2 cut-off, ensures that the voltage on data wire DATA is not dragged down by power line Vcc, ensures the first electronic installation and second electronic device stabilized communication.The present embodiment has only provided the course of work that control signal is provided to triode control end base stage by the first electronic installation.In fact, control signal also can have second electronic device or other external electronic installations to send, and can play equally the effect of controlling triode T2, reaches identical effect.
Embodiment bis-:
Refer to Fig. 7; switch comprises the first electronic installation; second electronic device; power line Vcc; data wire DATA; clock line CLK and ground wire GND; can also comprise other connecting lines such as select lines; the power output end of the first electronic installation connects the power input of second electronic device by power line Vcc; the data-interface of the first electronic installation connects the data-interface of second electronic device by data wire DATA; between the data-interface of second electronic device and power input, be in series with the Overvoltage protecting unit of one-way conduction, as diode.Clock line CLK and ground wire GND two ends are connected on the first electronic installation and interface corresponding to second electronic device, a pull-up resistor R connects between the internal electric source V of the first electronic installation and data-interface, switch also comprises control unit, this control unit is arranged on the first electronic installation, this control unit is diode D2 or triode T2, for in the time of the power output end output low level of the first electronic installation, oppositely end the signal conduction of power line Vcc.When the output voltage of power line Vcc is 0 or when electronegative potential, control unit oppositely ends.Thereby ensure that the voltage on data wire DATA can not dragged down by power line Vcc, ensured the first electronic installation and second electronic device stabilized communication.
Diode D2 is identical with the course of work in embodiment mono-with the triode T2 course of work in the present embodiment, and the present embodiment is no longer described in detail.
Embodiment tri-:
Refer to Fig. 8; switch comprises the first electronic installation; second electronic device; power line Vcc; data wire DATA; clock line CLK and ground wire GND; can also comprise other connecting lines such as select lines; the power output end of the first electronic installation connects the power input of second electronic device by power line Vcc; the data-interface of the first electronic installation connects the data-interface of second electronic device by data wire DATA; between the data-interface of second electronic device and power input, be in series with the Overvoltage protecting unit of one-way conduction, as diode.Clock line CLK and ground wire GND two ends are connected on the first electronic installation and interface corresponding to second electronic device, a pull-up resistor R connects between the internal electric source V of the first electronic installation and data-interface, switch also comprises control unit, this control unit is arranged on second electronic device, this control unit is diode D2 or triode T, for in the time of the power output end output low level of the first electronic installation, oppositely end the signal conduction of power line Vcc.When the output voltage of power line Vcc is 0 or when electronegative potential, control unit oppositely ends.Thereby ensure that the voltage on data wire DATA can not dragged down by power line Vcc, ensured the first electronic installation and second electronic device stabilized communication.
Diode D2 is identical with the course of work in embodiment mono-with the triode T2 course of work in the present embodiment, and the present embodiment is no longer described in detail.
Refer to Fig. 9; equipment comprises imaging device; imaging box chip, power line Vcc, data wire DATA; clock line CLK and ground wire GND; can also comprise other connecting lines such as select lines, the power output end of imaging device connects the power input of imaging box chip by power line Vcc, and the data-interface of imaging device connects the data-interface of imaging box chip by data wire DATA; between the data-interface of imaging box chip and power input, be in series with the Overvoltage protecting unit of one-way conduction, as diode.Clock line CLK and ground wire GND two ends are connected on imaging device and interface corresponding to imaging box chip, a pull-up resistor R1 connects between the internal electric source V of imaging device and data-interface, switch also comprises control unit, control unit is connected on power line Vcc, for in the time of the power output end output low level of imaging device, oppositely end the signal conduction of power line Vcc.When the output voltage of power line Vcc is 0 or when electronegative potential, control unit oppositely ends.Thereby ensure that the voltage on data wire DATA can not dragged down by power line Vcc.
Control unit also can be integrated on imaging device or imaging box chip, can play and be connected on the upper the same effect of power line Vcc, can ensure that equally the voltage on data wire DATA can not dragged down by power line Vcc, ensure imaging device and imaging box chip stabilized communication.
Diode D2 is identical with the course of work in embodiment mono-with the triode T2 course of work in the present embodiment, and the present embodiment is no longer described in detail.
Embodiment tetra-:
Refer to Figure 10, a kind of switch comprises the first electronic installation, second electronic device and the power module V2 that is independent of the first electronic installation and second electronic device, the data-interface of the first electronic installation connects the data-interface of second electronic device by data wire DATA, the power input of second electronic device connects the power output end of power module V2 by power line Vcc, between the data-interface of second electronic device and power input, be in series with the Overvoltage protecting unit of one-way conduction, described switch also comprises control unit, described control unit is connected on described power line Vcc, for when the power output end output low level of described the first electronic installation or the low-voltage, end the signal conduction of described power line.When the output voltage of power line Vcc is 0 or when electronegative potential, control unit cut-off, thus ensure that the voltage on data wire DATA can not dragged down by power line Vcc.
Refer to Figure 11, the control unit being connected in the present embodiment on power line Vcc is diode D3, and the conducting direction of diode D3 is to second electronic device by power module V2.In the time that the voltage on data wire DATA is a certain amount of higher than the voltage on power line Vcc, due to the reverse cut-off effect of diode D2, make not existed to the discharge loop of power line Vcc from data wire DATA.But in second electronic device, also have an overvoltage crowbar, when overvoltage, the positive charge on data wire DATA flows into the overvoltage crowbar in second electronic device, can play equally the effect of overvoltage protection.In the time of power module V2 normal power supply, diode D3 normally.In the time of power module V2 power output end output LOW voltage or low level, diode D3 oppositely ends.Thereby ensure that the voltage on data wire DATA is not dragged down by power line Vcc, ensured the first electronic installation and second electronic device stabilized communication.
Refer to Figure 12, the control unit being connected in the present embodiment on power line Vcc is triode T3, the switch terminals emitter and collector of triode T3 is connected on power line Vcc, the control end of triode T3 is base stage, control end receives the control signal of the first electronic installation, controls conducting and the cut-off of triode T3.In the time that the voltage on data wire DATA is a certain amount of higher than the voltage on power line Vcc, due to the reverse cut-off effect of triode T3, make not existed to the discharge loop of power line Vcc from data wire DATA.But in second electronic device, also have an overvoltage crowbar, when overvoltage, the positive charge on data wire DATA flows into the overvoltage crowbar in second electronic device, can play equally the effect of overvoltage protection.The specific works principle of connection triode T3 is, triode T3 receives the control signal of the first electronic installation, and in the time that the voltage of control end base stage is 0, power line Vcc normally works, triode T3 conducting; When the output voltage of power line Vcc is 0 or when too low, triode T3 cut-off, ensures that the voltage on data wire DATA is not dragged down by power line Vcc, ensures the first electronic installation and second electronic device stabilized communication.The present embodiment has only provided the course of work that control signal is provided to triode control end base stage by the first electronic installation.In fact, control signal also can have second electronic device or other external electronic installations to send, and can play equally the effect of controlling triode T3, reaches identical effect.
According to the described technical scheme of embodiment tetra-, control unit also can be arranged in the first electronic installation or second electronic device, and control unit can be diode or triode, and its operation principle is identical with embodiment tetra-, is no longer described in detail.
The switch that embodiment tetra-provides can be applied in imaging device equally, is not described in detail at this.
Data-interface in embodiments of the present invention does not draw in Figure of description, but actual existence can be consulted Fig. 2, and Fig. 3 understands.
The application of inventive concept is not limited to data wire DATA, also comprises the holding wire of the transmission of information such as clock line, select lines that connects two electronic installations.
To the embodiment of the present invention, to provided switch and switch, the application in imaging device is described in detail above, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand equipment of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.
Claims (10)
1. a switch, comprises the first electronic installation and second electronic device,
The power output end of the first electronic installation connects the power input of second electronic device by power line,
The data-interface of the first electronic installation connects the data-interface of second electronic device by data wire,
The Overvoltage protecting unit that is in series with one-way conduction between the data-interface of second electronic device and power input, is characterized in that:
Described switch also comprises control unit, described control unit is connected on described power line, for when the power output end output low level of described the first electronic installation or the low-voltage, end the signal conduction of described power line, ensure that the voltage on data wire is not dragged down by power line.
2. switch according to claim 1, is characterized in that, described control unit comprises, conducting direction is the one-way conduction element to the power input of second electronic device by the power output end of the first electronic installation.
3. switch according to claim 2, is characterized in that, described one-way conduction element is diode.
4. switch according to claim 1, it is characterized in that, described control unit comprises trigistor, the switch terminals of described trigistor is connected on described power line, the control end reception control signal of described trigistor, described control signal is from the first electronic installation, second electronic device or external connected electronic device, in the time of the power output end output low level of described the first electronic installation or low-voltage, according to described control signal, control between described switch terminals and disconnect.
5. switch according to claim 4, is characterized in that, described trigistor is triode.
6. according to the switch described in claim 1～5 any one, it is characterized in that, described control unit is arranged in described the first electronic installation or second electronic device.
7. switch according to claim 1, is characterized in that, described the first electronic installation is imaging device, and described second electronic device is imaging box chip.
8. a switch, comprises the first electronic installation, second electronic device and the power module that is independent of described the first electronic installation and second electronic device,
The data-interface of the first electronic installation connects the data-interface of second electronic device by data wire,
The power input of second electronic device connects the power output end of power module by power line,
The Overvoltage protecting unit that is in series with one-way conduction between the data-interface of second electronic device and power input, is characterized in that:
Described switch also comprises control unit, described control unit is connected on described power line, for when the power output end output low level of described power module or the low-voltage, end the signal conduction of described power line, ensure that the voltage on data wire is not dragged down by power line.
9. switch according to claim 8, is characterized in that, described control unit is arranged in described the first electronic installation or second electronic device.
10. switch according to claim 8 or claim 9, is characterized in that, described control unit comprises diode or triode.
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| CN201110072316.8A CN102170104B (en) | 2011-03-24 | 2011-03-24 | Data exchange apparatus |
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| CN201110072316.8A CN102170104B (en) | 2011-03-24 | 2011-03-24 | Data exchange apparatus |
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| CN102170104B true CN102170104B (en) | 2014-08-13 |
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| CN201414009Y (en) * | 2009-03-27 | 2010-02-24 | 上海华勤通讯技术有限公司 | CDMA mobile phone compatible Nokia charger circuit |
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| JP3340332B2 (en) * | 1996-11-20 | 2002-11-05 | オリジン電気株式会社 | High voltage generator with disconnection determination function |
| CN2505913Y (en) * | 2001-10-09 | 2002-08-14 | 旭丽股份有限公司 | Shared interface equipment |
| CN201508549U (en) * | 2009-09-02 | 2010-06-16 | 中兴通讯股份有限公司 | Device and system for controlling on-off of USB (universal serial bus) interface |
| CN101794110B (en) * | 2010-03-24 | 2012-11-21 | 珠海艾派克微电子有限公司 | Machine recognition method and device between imaging device and imaging box |
| CN201955777U (en) * | 2011-03-24 | 2011-08-31 | 珠海艾派克微电子有限公司 | Data switching equipment |
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| CN201414009Y (en) * | 2009-03-27 | 2010-02-24 | 上海华勤通讯技术有限公司 | CDMA mobile phone compatible Nokia charger circuit |
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Address after: Floor 7, Building 04, No. 63, Mingzhu North Road, Zhuhai City, Guangdong Province, 519000 Patentee after: Jihai Microelectronics Co.,Ltd. Address before: Floor 7, Building 04, No. 63, Mingzhu North Road, Zhuhai City, Guangdong Province, 519000 Patentee before: APEX MICROELECTRONICS Co.,Ltd. |