CN104704445A - Electronic device, communication system, and hot-plug control method - Google Patents
Electronic device, communication system, and hot-plug control method Download PDFInfo
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- CN104704445A CN104704445A CN201380050046.8A CN201380050046A CN104704445A CN 104704445 A CN104704445 A CN 104704445A CN 201380050046 A CN201380050046 A CN 201380050046A CN 104704445 A CN104704445 A CN 104704445A
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- pin
- signal
- external device
- resistive element
- connector
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
- G09G5/006—Details of the interface to the display terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network
- H04N21/43632—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network involving a wired protocol, e.g. IEEE 1394
- H04N21/43635—HDMI
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2370/00—Aspects of data communication
- G09G2370/12—Use of DVI or HDMI protocol in interfaces along the display data pipeline
Abstract
This electronic device is provided with: a connector (11) connected to an external device via a communication cable; a controller (13); and an output unit (14). The connector (11) is provided with at least a first pin and a second pin. A prescribed voltage is supplied from the external device to the first pin. The controller (13) is provided with a communication unit into which a signal is inputted from the external device via a pin other than the first and second pins of the connector (11). When the communication unit is in an activated state, the controller (13) outputs a first signal indicating that the communication unit is in an activated state. In cases when the first signal is not outputted, the output unit (14) outputs, to the external device via the second pin, a detection signal indicating that no connection has been established with the external device.
Description
Technical field
The present invention relates to a kind of for making external device (ED) can detect the technology with the connection of electronic installation in a communications system, being connected to electronic installation at described communication system peripheral device via signal cable.
Background technology
In the communication system that external device (ED) and electronic installation are connected to each other via signal cable, the signal that electronic installation is connected with external device (ED) from external device (ED) receiver voltage to export instruction.As such device, such as, HDMI (HDMI (High Definition Multimedia Interface)) device comprising interface HDMI standard is known.
HDMI is the standard about the communication interface for being sent video/audio by digital signal.In recent years, the various devices comprising the interface meeting HDMI standard have been provided.
Communication system based on HDMI standard comprises the source apparatus for exporting HDMI signal, and the receiving trap (sink device) for receiving HDMI signal.Source apparatus and receiving trap are connected to each other (referenced patent document 1) via HDMI cable.
Source apparatus is such as blue light player, video camera or mancarried device.Receiving trap is such as monitor or the projector of such as HD (high definition) TV.
In aforementioned communication system, when source apparatus and receiving trap are connected to each other via HDMI cable, perform the process for sending HDMI signal between source apparatus and receiving trap.
Fig. 1 illustrates the example of HDMI signal sending/receiving order.
With reference to figure 1, first, source apparatus is supplied predetermined voltage (such as ,+5V) (step S100) to receiving trap.The receiving trap having received voltage sends hot-swappable detection signal (step S101) to source apparatus.
Based on the hot-swappable detection signal from receiving trap, source apparatus identifies that it is connected to receiving trap.
Receive the access of source apparatus execution to EDID (extending display identification data) information in receiving trap of hot-swappable detection signal.Receiving trap sends the EDID information (step S103) of its maintenance to source apparatus.EDID information refers to the data set being shown with and closing the corresponding function of receiving trap or the information of performance (particularly, form or resolution).
Source apparatus identifies form or the resolution of the video/audio that can be reproduced by receiving trap based on the EDID information obtained from receiving trap, and is sent and form or the video/audio signal corresponding with resolution (step S104) to receiving trap by TDMS (transition minimized differential signaling) method.
Receiving trap receives TDMS signal (step S105) from source apparatus.Except TMDS signal, from source apparatus to receiving trap supply clock signal and control signal.Receiving trap performs the process of the reproduction of such as TMDS signal based on clock signal according to control signal.
Fig. 2 illustrates the configuration example of receiving trap.
With reference to figure 2, receiving trap comprises HDMI connector 101, storer 102 and HDMI receiver IC (integrated circuit) 103.
Storer 102 is nonvolatile memories of such as EEPROM (EEPROM (Electrically Erasable Programmable Read Only Memo)), and stores EDID information.
HDMI connector 101 is the standard style connector with 19 pins.19th pin is the pin for heat outputting plug detection signal.Voltage from the+5V of source apparatus is supplied to the 18th pin.
18th pin is connected to the 19th pin via resistive element.When the voltage of+5V is supplied to the 18th pin, current flowing resistance element, and from the 19th pin heat outputting plug detection signal (+5V).
15th pin and the 16th pin are the pins for reading storage EDID information in the memory 102.15th pin and the 16th pin are connected to storer 102 and HDMI receiver IC 103.
Received by some residue in pin from the TMDS signal of source apparatus, clock signal and control signal.HDMI receiver IC 103 performs the reproduction processes of TMDS signal based on clock signal according to control signal.
Fig. 3 illustrates another configuration example of receiving trap.
Receiving trap shown in Fig. 3 is configured such that storer 102 is removed from the receiving trap shown in Fig. 2 and HDMI receiver IC 103 stores EDID information 104.
In the receiving trap shown in Fig. 3, HDMI receiver IC 103 is accessed by from source apparatus via the 15th pin and the 16th pin, and exports the EDID information 104 of its maintenance from the 15th pin and the 16th pin.Other operation is similar to those shown in Fig. 2.
Shown in Fig. 2 and Fig. 3 two receiving trap exports the hot-swappable detection signal of+5V from the 19th pin when the voltage of+5V is supplied to the 18th pin, and no matter whether receiving trap is in power source ON state.
Reference listing
Patent documentation 1:JP2011-239386A
Summary of the invention
As mentioned above, even if the receiving trap of two shown in Fig. 2 and Fig. 3 is configured to the hot-swappable detection signal also exporting+5V under power OFF status when having supplied the voltage of+5V from source apparatus to source apparatus.On the other hand, the function whether power supply that source apparatus does not detect the receiving trap that it is connected to is connected.Therefore, in the receiving trap shown in Fig. 2 and Fig. 3, when being connected to the source apparatus being in power OFF status, following problem may be there is.Power OFF status is not waiting status (holding state) but receiving trap is not connected to the state of any commercial AC mains.
First, the problem produced when the receiving trap shown in Fig. 2 is connected to the source apparatus being in power OFF status will be described in.
Source apparatus receives the hot-swappable detection signal of+5V from the receiving trap be arranged on power OFF status, and reads EDID information from the storer 102 receiving trap.In the receiving trap shown in Fig. 2, because EDID information is stored in the storer 102 as nonvolatile memory, so when being the power supply access failure of convenient receiving trap, source apparatus also can read EDID information from storer 102.
Get the source apparatus of EDID information from the receiving trap being in power OFF status to the receiving trap supply TMDS signal being in power OFF status.Current leakage may be caused to the circuit of receiving trap to the receiving trap supply TMDS signal being in power OFF status, thus cause the faulty operation of receiving trap.
Usually, HDMI receiver IC 130 has faulty operation and prevents function.When the power supply of receiving trap is connected, because faulty operation prevents function, can prevent due to any faulty operation caused by leakage current.But when the power supply access failure of receiving trap as above, faulty operation prevents function from not working.Therefore, be serious by the faulty operation caused by leakage current.
Next, the problem produced when the receiving trap shown in Fig. 3 is connected to the source apparatus being in power OFF status will be described in.
Source apparatus receives the hot-swappable detection signal of+5V from the receiving trap be arranged on power OFF status, and performs the access to the EDID information 104 in receiving trap.In the receiving trap shown in Fig. 3, because EDID information 104 is stored in HDMI receiver IC 103, so when the power supply access failure of receiving trap, source apparatus can not access HDMI receiver IC 103, and it can not obtain EDID information 104.
When getting EDID information, source apparatus can not identify function or the performance (form or resolution) of receiving trap.Therefore, source apparatus does not supply any TMDS signal to receiving trap.
As mentioned above, when source apparatus can not obtain any EDID information after it has received the hot-swappable detection signal of+5V, source apparatus does not supply any TMDS signal to receiving trap.Therefore, when namely the power supply of convenient receiving trap is switched on, do not have video can be received device display yet.
Such as, when under source apparatus and receiving trap are via the connection status of HMDI cable, after the power supply connecting source apparatus, the power supply of receiving trap is switched on, as mentioned above, perhaps source apparatus can not obtain any EDID information of receiving trap, and perhaps receiving trap can not show any video.
Also may under the connection status of receiving trap to commercial AC mains and occur under the unactivated state of the communication unit of HDMI receiver IC 103 or HDMI receiver IC 103 video faulty operation and suppress display problem.Communication unit is for via the part of HDMI connector 101 from source apparatus Received signal strength.
Therefore the object of this invention is to provide the faulty operation that can solve video and the electronic installation preventing the problem shown, communication system and hot-swappable control method.
To the solution of problem
In order to realize object, according to an aspect of the present invention, provide electronic installation, described electronic installation comprises: connector, external device (ED) is connected to described connector via signal cable and described connector at least comprises the first pin and the second pin, from external device (ED) to the first pin supply predetermined voltage; Controller, described controller comprises the communication unit that signal is imported into from external device (ED) via the pin except the first pin of connector and the second pin, and when communication unit is in state of activation, described controller exports the first signal that instruction communication unit is in state of activation; And output unit, when not yet exporting the first signal, described output unit exports the first detection signal indicating and not yet connect with external device (ED) via the second pin external device.
According to a further aspect in the invention, provide communication system, described communication system comprises: receiving trap, and described receiving trap comprises the electronic installation according to any one in claim 1 to 16; And source apparatus, receiving trap is connected to described source apparatus via telecommunication cable, and wherein, source apparatus supplies predetermined voltage to receiving trap, and when receiving the detection signal of predetermined voltage from receiving trap, identifies that it is connected to receiving trap.
According to a further aspect of the invention, provide the hot-swappable control method realized in an electronic, described electronic installation comprise external device (ED) via signal cable be connected to and at least comprise the connector of the first pin and the second pin, described method comprises: when having supplied predetermined voltage from external device (ED) to the first pin the state be not activated via the communication unit that the pin except the first pin of connector and the second pin is imported into from external device (ED) at signal, the first detection signal indicating and not yet connect with external device (ED) is exported via the second pin external device, and when having supplied predetermined voltage from external device (ED) to the first pin under the state that communication unit is activated, exporting via the second pin external device and being supplied to the signal of the predetermined voltage of the first pin as the second detection signal.
Accompanying drawing explanation
[Fig. 1] is shown in the figure of the example of the HDMI signal sending/receiving order performed in the communication system based on HDMI standard.
[Fig. 2] illustrates the block diagram of the configuration example of receiving trap.
[Fig. 3] illustrates the block diagram of another configuration example of receiving trap.
[Fig. 4] diagram is according to the block diagram of the configuration of the HDMI device of the first exemplary embodiment of the present invention.
[Fig. 5] is shown in the schematic diagram of the operation under the power OFF status of the HDMI device shown in Fig. 4.
[Fig. 6] is shown in the schematic diagram of the operation under the power source ON state of the HDMI device shown in Fig. 4.
[Fig. 7] diagram is according to the block diagram of the configuration of the HDMI device of the second exemplary embodiment of the present invention.
[Fig. 8] diagram is according to the block diagram of the configuration of the HDMI device of the 3rd exemplary embodiment of the present invention.
[Fig. 9] is shown in the schematic diagram of the operation under the power OFF status of the HDMI device shown in Fig. 8.
[Figure 10] is shown in the schematic diagram of the operation under the power source ON state of the HDMI device shown in Fig. 8.
[Figure 11] diagram is according to the figure of the modified example of the HDMI device of the 3rd exemplary embodiment of the present invention.
[Figure 12] diagram is according to the figure of the modified example of the HDMI device of the 3rd exemplary embodiment of the present invention.
[Figure 13] diagram is according to the block diagram of the configuration of the HDMI device of the 4th exemplary embodiment of the present invention.
Reference numeral
11 HDMI connector
12 storeies
13 HDMI receiver IC
14 on-off circuits
15 to 17 resistive elements
18 N-type MOSFET
19 transistors
Embodiment
The present invention is applied to the electronic installation being connected to external device (ED) via signal cable, is applied to the electronic installation receiving the signal whether predetermined voltage is electrically connected to each other with external device output instruction electronic installation and external device (ED) from external device (ED) especially.More specifically, the present invention is applied to the HDMI device of the interface be equipped with based on HDMI (HDMI (High Definition Multimedia Interface)) standard.HDMI is the universal standard about the communication interface for being sent video/audio by digital signal, and normally known.Therefore, will be omitted it specifically describe.
Hereinafter, embodiments of the invention are described with reference to accompanying drawing in detail by the example of HDMI device.
(the first exemplary embodiment)
Fig. 4 is the block diagram of diagram according to the configuration of the HDMI device of the first exemplary embodiment of the present invention.
HDMI device shown in Fig. 4 is receiving trap, such as, the monitor of such as HD (high definition) TV or projector, and its major part comprises HDMI connector 11, storer 12, HDMI receiver IC 13 and on-off circuit 14.
HDMI connector 11 is similar with storer 102 to the HDMI connector 101 shown in Fig. 2 with storer 12.As HDMI connector 11, the connector except standard form can be used, such as, there is the connector of 29 pins.
On-off circuit 14 exports from the 19th pin when control signal is in the first level (high level) and is supplied to the signal of the voltage+5V of the 18th pin as hot-swappable detection signal, and exports the signal of the voltage (low level or earth potential) lower than+5V as hot-swappable detection signal when control signal is in second electrical level (low level or earth potential) from the 19th pin.
Particularly, on-off circuit 14 comprises resistive element 15 to resistive element 17, N-shaped MOSFET 18 and transistor 19.
Transistor 19 is grounded emitter NPN transistor extremely.
One end of resistive element 15 is connected to one end of resistive element 16, and is connected to the 18th pin of HDMI connector 11.The other end of resistive element 15 is connected to the drain electrode of N-shaped MOSFET 18, and is connected to the 19th pin of HDMI connector 11.Replace N-shaped MOSFET, can NPN transistor be used.But, because restricted from the amount of signal to the circuit that can flow of the voltage+5V of the 18th pin supply, so the N-shaped MOSFET using small area analysis consumption is more easily.
The other end of resistive element 16 is connected to the grid of N-shaped MOSFET 18, and is connected to the collector of transistor 19.The source ground of N-shaped MOSFET 18.
The base stage of transistor 19 is connected to the control signal lead-out terminal of HDMI receiver IC 13 via resistive element 17.
The resistance value of resistive element 15 is the values of the 1k Ω based on HDMI standard.The resistance value of resistive element 16 and resistive element 17 is all about 10k Ω.
While the power supply of HDMI device is connected, HDMI receiver IC 13 exports high-level control signal from control signal lead-out terminal.In period period (state of the power supply access failure of HDMI device) except the above-mentioned period, the voltage of control signal lead-out terminal is in low level (earth potential).The on-off element of such as MOSFET can be used to realize this configuration.Period of power source ON is that receiving trap is connected to commercial AC mains and the no matter normal operating state of receiving trap or holding state how period.
Next, the operation according to the HDMI device of this embodiment will be described.
Fig. 5 schematically illustrates the operation when the 18th pin to HDMI connector 11 in the HDMI device being in power OFF status has supplied the voltage of+5V.
As shown in Figure 5, in the HDMI device being in power OFF status, because HDMI receiver IC 13 is not activated, so low level control signal is supplied to the base stage of transistor 19 via resistive element 17.Therefore, transistor 19 is set in OFF state.
When the 18th pin to HDMI connector 11 under the OFF state at transistor 19 has supplied the voltage of+5V, the voltage of+5V has been supplied to the grid of N-shaped MOSFET 18.Because the threshold voltage of N-shaped MOSFET 18 is lower than+5V, so N-shaped MOSFET 18 is set in ON state.
Under the ON state of N-shaped MOSFET 18, the 19th pin is via N-shaped MOSFET18 ground connection, and therefore the voltage level of the 19th pin is reduced to low level.As a result, the hot-swappable detection signal exported from the 19th pin is set to low level.
When hot-swappable detection signal is in low level, the unidentified HMDI device of source apparatus.
Fig. 6 schematically illustrates the operation when the 18th pin to HDMI connector 11 in the HDMI device being in power source ON state has supplied the voltage of+5V.
As shown in Figure 6, in the HDMI device being in power source ON state, HDMI receiver IC 13 is via the base stage supply high-level control signal of resistive element 17 to transistor 19.Therefore, transistor 19 is set to ON state.
Under the ON state of transistor 19, the grid of N-shaped MOSFET 18 is via transistor 19 ground connection.As a result, the voltage level of the grid of N-shaped MOSFET 18 is set to the level (low level) lower than its threshold voltage, and N-shaped MOSFET 18 is set to OFF state.
Under the OFF state of N-shaped MOSFET 18, the 18th pin and the 19th pin are connected to each other simply via resistive element 15, and export the hot-swappable detection signal of+5V from the 19th pin.
Received the hot-swappable detection signal of+5V source apparatus identification it be connected to HDMI device.Then, between source apparatus and HDMI device, perform the process of the process based on the step S102 to S105 shown in Fig. 1.
According to the HDMI device of this embodiment, when HDMI device is connected to the source apparatus being in power OFF status, even if the voltage of+5V is supplied to the 18th pin of HDMI connector 11, be also low level from the level of the hot-swappable detection signal of the 19th pin output.Therefore, source apparatus unidentified it be connected to the HDMI device being in power OFF status.As a result, do not have TMDS signal to be supplied to the HDMI device of power OFF status from source apparatus, HDMI device also unexpectedly can not be operated by the leakage current occurred when TMDS signal is supplied.
(the second exemplary embodiment)
Fig. 7 is the block diagram of diagram according to the configuration of the HDMI device of the second exemplary embodiment of the present invention.
Be configured such that storer 12 is removed by from the HDMI device shown in Fig. 4 according to the HDMI device of this embodiment, and HDMI receiver IC 13 stores EDID information 13a.
According in the HDMI device of this embodiment, HDMI receiver IC 13 receives the access from source apparatus via the 15th pin of HDMI connector 11 and the 16th pin, and exports from the 15th pin and the 16th pin the EDID information 13a that it has stored.Other operation operates similar to those of the first embodiment.
According in the HDMI device of this embodiment, as in the case of a first embodiment, if it is connected to the source apparatus being in power OFF status, namely, when the voltage of box lunch+5V is supplied to the 18th pin of HDMI connector 11, be also low level from the level of the hot-swappable detection signal of the 19th pin output.Therefore, source apparatus unidentified it be connected to the HDMI device being in power OFF status.As a result, source apparatus do not access be in power OFF status HDMI device to obtain EDID information.
According in the HDMI device of this embodiment, as when aforementioned arrangement, when the power is turned on, export the hot-swappable detection signal of+5V from the 19th pin.Received the hot-swappable detection signal of+5V source apparatus identification it be connected to HDMI device, obtain EDID information from HDMI device, and to HDMI device provisioning TMDS signal.Such as, according to this operation, when after being connected to each other by HDMI cable with the HDMI device being in power OFF status at source apparatus, the power supply of HDMI device is switched on, from source apparatus to HDMI device provisioning TMDS signal.Therefore, the video based on TMDS signal is displayed on HDMI device.
The aforementioned HDMI device of corresponding embodiment is only example of the present invention, and when not departing from main points of the present invention, to its configuration and can operate the change made as those skilled in the art may appreciate that.
Such as, in the HDMI device shown in Fig. 4 and Fig. 7, the control module except HDMI receiver IC can to on-off circuit 14 supply control signal.In this case, control module can be used to the control circuit of the overall operation controlling receiving trap.
On-off circuit 14 is not limited to illustrated circuit.As long as can from the second pin (such as when control signal is in the first level (high level), 19th pin) export be supplied to the first pin (such as, 18th pin) the signal of voltage+5V as hot-swappable detection signal, if and the signal of the voltage (low level or earth potential) lower than+5V can be exported from the second pin when control signal is in second electrical level (low level), just can adopt any configuration.Replace the semiconductor switch of such as MOSFET or transistor, the mechanical switch of such as relay can be used.Under these circumstances, use latching relay to make power consumption to be reduced to 0, and be easily.
(the 3rd exemplary embodiment)
Fig. 8 is the block diagram of diagram according to the configuration of the HDMI device of the 3rd exemplary embodiment of the present invention.
HDMI device shown in Fig. 8 uses on-off circuit 20 to replace the on-off circuit 14 of the HDMI device shown in Fig. 4.HDMI connector 11, storer 12 and HDMI receiver IC 13 are similar to those shown in Fig. 4.
In the HDMI device shown in Fig. 4, on-off circuit 14 comprises for the switch between second pin (such as, the 19th pin) of hot-swappable detection and earth potential.On the other hand, in this embodiment, on-off circuit 20 comprises the switch between the first pin (such as, the 18th pin) for supply voltage+5V and the second pin (such as, the 19th pin) for hot-swappable detection.
On-off circuit 20 comprises resistive element 15 and switch 21.Switch 21 is mechanical switchs of semiconductor switch or such as relay.Semiconductor switch can by transistor or FET or its combination configuration.
When control signal is in the first level (high level), switch 21 is switched on to arrange short-circuit condition via resistive element 15 between the 18th pin and the 19th pin.In this case, be supplied to the signal of the voltage+5V of the 18th pin as hot-swappable detection signal via resistive element 15 from the 19th pin output.Therefore, source apparatus detects that hot-swappable detection signal is in high level, and identifies the HDMI device as receiving trap.
On the other hand, when control signal is in second electrical level (low level or earth potential), switch 21 is cut off to arrange release conditions (high impedance status) between the 18th pin and the 19th pin.In this case, because do not have voltage+5V to be supplied to the 19th pin, so the unidentified HDMI device as receiving trap of source apparatus.
The state of Fig. 9 diagram as the power supply OFF of HDMI device.Because control signal is in second electrical level (low level), switch 12 is set in release conditions.In this case, because be not supplied to the signal of the voltage+5V of the 18th pin as hot-swappable detection signal, so the unidentified HDMI device as receiving trap of source apparatus via resistive element 15 from the 19th pin output.
Figure 10 illustrates the power source ON state of HDMI device.Because control signal is in the first level (high level), switch 21 is set in short-circuit condition, and is supplied to the signal of the voltage+5V of the 18th pin to be supplied to the 19th pin as hot-swappable detection signal via resistive element 15.Source apparatus can identify HDMI device based on the hot-swappable detection signal exported from the 19th pin.
On-off circuit 20 can be configured by the mechanical switch of such as relay.
The example of Figure 11 and Figure 12 diagram when on-off circuit 20 is configured by mechanical relay.On-off circuit 20 comprises resistive element 15 and resistive element 23 and relay 22.Relay 22 comprises contact 22-1 and coil 22-2.Coil 22-2 such as comprises drive coil.Under contact 22-1 is arranged on ON state by the flowing of coil 22-2 by electric current.When not having electric current to flow through coil 22-2, contact 22-1 is set in OFF state.
A terminal of contact 22-1 is connected to the 18th pin via resistive element 15, and another connecting terminals of contact 22-1 is connected to the 19th pin.One end ground connection of coil 22-2, and the other end of contact 22-2 is connected to one end of resistive element 23.Control signal is supplied to the other end of resistive element 23.
The state of Figure 11 diagram as the power supply OFF of HDMI device.Because control signal is in second electrical level (low level), contact 22-1 is set in release conditions.In this case, because be provided with release conditions (high impedance status) at the 18th pin and the 19th pin, so be not supplied to the signal of the voltage+5V of the 18th pin as hot-swappable detection signal via resistive element 15 from the 19th pin output.Therefore, the unidentified HDMI device as receiving trap of source apparatus.
Figure 12 illustrates the power source ON state of HDMI device.Because control signal is in the first level (high level), contact 22-1 is set in short-circuit condition, and is supplied to the signal of the voltage+5V of the 18th pin to be supplied to the 19th pin as hot-swappable detection signal via resistive element 15.Source apparatus can identify HDMI device based on the hot-swappable detection signal exported from the 19th pin.
According to the HDMI device of this embodiment, when HDMI device is connected to the source apparatus being in power OFF status, because do not have the voltage of+5V to be supplied to the 18th pin of HDMI connector 11, so be not in high level from the level of the hot-swappable detection signal of the 19th pin output.Therefore, source apparatus unidentified it be connected to the HDMI device being in power OFF status.As a result, do not have TMDS signal to be supplied to the HDMI device being in power OFF status from source apparatus, HDMI device also unexpectedly can not be operated by the leakage current occurred when TMDS signal is supplied.
According in the HDMI device of this embodiment, as the same with when the second embodiment in the first embodiment, the latching relay in the middle of mechanical relay can be used as on-off circuit.In this case, because need to supply control voltage, so lower power consumption can be realized when the short-circuit condition only between terminal and the release conditions between terminal switch.
According in the HDMI device of this embodiment, as in the previous case, the control module except HDMI receiver IC can to on-off circuit 20 supply control signal.In this case, such as, control module can be the control circuit of the overall operation for controlling receiving trap.
According in the HDMI device of this embodiment, as in the previous case, storer 12 can be removed, and HDMI receiver IC 13 can be accessed by from source apparatus via the 15th pin of HDMI connector 11 and the 16th pin, and can export from the 15th pin and the 16th pin the EDID information 13a that it has stored.
(the 4th exemplary embodiment)
Figure 13 is the block diagram of diagram according to the configuration of the HDMI device of the 4th exemplary embodiment of the present invention.
HDMI device shown in Figure 13 is similar to the HDMI device shown in Fig. 8 in configuration, replaces the switch 21 of on-off circuit 20 except comprising switch 24.
Switch 24 is mechanical switchs of such as semiconductor switch or relay.Semiconductor switch can by transistor or FET or its combination configuration.
Switch 24 comprises the first terminal to the 3rd terminal.The first terminal is connected to the 19th pin via resistive element 15.Second connecting terminals is connected to the 18th pin, and the 3rd terminal ground.
Switch 24 performs between the second state that the first state and the first terminal that are connected at the first terminal and the second terminal and the 3rd terminal be connected according to the control signal from HDMI receiver IC 13 and switches.
When control signal is in the first level (high level), switch 24 is set in the first state to arrange short-circuit condition via resistive element 15 between the 18th pin and the 19th pin.In this case, be supplied to the signal of the voltage+5V of the 18th pin as hot-swappable detection signal via resistive element from the 19th pin output.Therefore, source apparatus detects that hot-swappable detection signal is high level, and identifies the HDMI device as receiving trap.
On the other hand, when control signal is in second electrical level (low level or earth potential), switch 24 is set in the second state with under the 19th pin being arranged on ground state via resistive element 15.In this case, because do not have voltage+5V to be supplied to the 19th pin, source apparatus can not identify the HDMI device as receiving trap.
HDMI device according to this embodiment provides following operating effect.
Because the 19th pin is connected to the input end of the testing circuit of source apparatus etc. via signal cable, so when the 19th pin is set in release conditions (high impedance status), external interfering noise etc. can be imported into source apparatus via the signal wire of the 19th pin, thus source apparatus is unexpectedly operated.According to the HDMI device of this embodiment because the 19th pin via resistive element 15 be connected to the 18th pin or GND (), so the 19th pin is not set to be in release conditions.As a result, be difficult to affected by noise.
When the 19th pin be connected directly to GND () time, depend on the Circnit Layout of source apparatus, may make a mistake operation.According to the HDMI device according to this embodiment because the 19th pin via resistive element 15 (resistance value is such as 1k Ω) be connected to GND (), so such faulty operation can be prevented.
In the HDMI device of this embodiment, storer 12 can be removed, and HDMI receiver IC 13 can be accessed by from source apparatus via the 15th pin of HDMI connector 11 and the 16th pin, and can export from the 15th pin and the 16th pin the EDID information 13a that it has stored.
According to each in previous embodiment, while the power supply of HDMI device is connected, HDMI receiver IC 13 exports high-level control signal from control signal lead-out terminal, and in period period (state of the power supply access failure of HDMI device) than that described above, the voltage of control signal lead-out terminal is in low level (earth potential).Replace this to construct, high-level control signal can be exported from control signal lead-out terminal while the communication unit of HDMI receiver IC 13 or HDMI receiver IC 13 is activated, and during the period than that described above, the voltage of control signal lead-out terminal can be in low level (earth potential).When the communication unit of HDMI receiver IC 13, such as, when namely convenient HDMI receiver IC 13 does not have faulty operation to prevent function, also faulty operation can be prevented.Such as, the communication unit receiving video signals of HDMI receiver IC 13, sound signal, clock signal and/or the control signal that sends from external device (ED) (source apparatus) via connector 11.When HDMI receiver IC 13 stores EDID information 13a, the communication unit of HDMI receiver IC 13 can comprise EDID information 13a.The state that the communication unit of HDMI receiver IC 13 or HDMI receiver IC 13 is activated be such as the power supply of the communication unit of HDMI receiver IC 13 or HDMI receiver IC 13 connect state, HDMI receiver IC 13 or HDMI receiver IC 13 the completed state of initialization of communication unit, or communication unit for HDMI receiver IC 13 or HDMI receiver IC 13 and the completed state of preparation as the communication of the source apparatus of external device (ED).
Previous embodiment is example of the present invention, and without departing from the scope of the invention, can make various changes for those skilled in the art may appreciate that to configuration of the present invention and operation.
The present invention can adopt following form.But these forms never limit the present invention.
[annex 1]
A kind of electronic installation, described electronic installation comprises:
Connector, external device (ED) is connected to described connector via signal cable and described connector at least comprises the first pin and the second pin, from described external device (ED) to described first pin supply predetermined voltage;
Controller, described controller comprises the communication unit that signal is imported into from described external device (ED) via the pin except the first pin of described connector and the second pin, and when described communication unit is in state of activation, described controller exports the first signal that the described communication unit of instruction is in described state of activation; And
Output unit, when not yet exporting described first signal, described output unit exports the first detection signal indicating and not yet connect with described external device (ED) to described external device (ED) via described second pin.
[annex 2]
Electronic installation according to annex 1, wherein, when not yet exporting described first signal, described output unit output low level or earth potential are as described first detection signal.
[annex 3]
Electronic installation according to service 2, wherein, described output unit comprises described first signal and is imported into as control signal and during the period not inputting described first signal, described second pin is set to low level or earthy switch.
[annex 4]
Electronic installation according to annex 3, wherein:
Described switch comprises the first resistive element to the 3rd resistive element, MOSFET and transistor;
The emitter of described transistor and the source ground of described MOSFET;
One end of described first resistive element is connected to one end of described second resistive element, and is connected to the first pin of described connector;
The other end of described first resistive element is connected to the drain electrode of described MOSFET, and is connected to the second pin of described connector;
The other end of described second resistive element is connected to the grid of described MOSFET, and is connected to the collector of described transistor;
Described first signal is supplied to the base stage of described transistor via described 3rd resistive element;
During the described period not exporting described first signal, while described MOSFET is switched on, described transistor is cut off; And
During the period outputing described first signal, while described MOSFET is cut off, described transistor is switched on.
[annex 5]
Electronic installation according to annex 3, wherein:
Described switch comprises resistive element and on-off element;
Described on-off element comprises the first terminal to the 3rd terminal, and described the first terminal is connected to the first pin of described connector, described second terminal ground, and described 3rd terminal is connected to the second pin of described connector via described resistive element; And
During the period outputing described first signal, the first terminal and the 3rd terminal of described on-off element are connected; And
During the described period not exporting described first signal, the second terminal and the 3rd terminal of described on-off element are connected.
[annex 6]
Electronic installation according to annex 1, wherein, when not yet exporting described first signal, described output unit exports described first detection signal by discharging described second pin.
[annex 7]
Electronic installation according to annex 6, wherein, when not yet exporting described first signal, described output unit arranges release conditions between described first pin and described second pin.
[annex 8]
Electronic installation according to annex 7, wherein:
Described output unit comprises the switch and resistive element that described first signal is imported into as control signal;
Described first pin is connected to one end of described switch via described resistive element, and described second pin is connected to the other end of described on-off element; And
Described switch arranges described release conditions during the period not exporting described first signal between described first pin and described second pin.
[annex 9]
Electronic installation according to annex 7, wherein:
Described output unit comprises the relay and the first resistive element and the second resistive element that described first signal is imported into as control signal;
Described first pin is connected to a terminal of described relay via described first resistive element, and described second pin is connected to the terminal of the other end of described relay; And
Described relay arranges described release conditions during the period not exporting described first signal between described first pin and described second pin.
[annex 10]
Electronic installation according to annex 7, wherein:
Described switch comprises resistive element and on-off element;
One end of described resistive element is connected to the first pin of described connector, and the other end of described resistive element is connected to the second pin of described connector via described on-off element;
During the period outputing described first signal, described on-off element is switched on; And
During the described period not exporting described first signal, described on-off element is cut off.
[annex 11]
Electronic installation according to any one in annex 1 to 10, wherein, when exporting described first signal, described output unit exports the second detection signal indicating and not yet connect with described external device (ED) to described external device (ED) via described second pin.
[annex 12]
Electronic installation according to annex 11, wherein, during the described period outputing described first signal, described output unit exports from described second pin and is supplied to the signal of the predetermined voltage of described first pin as described second detection signal.
[annex 13]
Electronic installation according to any one in annex 1 to 12, also comprises the nonvolatile memory of the resolution of storage instruction video/sound signal and the identification data of form,
Wherein, described connector also comprises described external device (ED) reads described identification data from described nonvolatile memory pin by it.
[annex 14]
Electronic installation according to any one in annex 1 to 12, wherein:
Described control module stores the resolution of instruction video/sound signal and the identification data of form; And
Described connector also comprises described external device (ED) and accesses described control module to obtain the pin of described identification data by it.
[annex 15]
Electronic installation according to any one in annex 1 to 14, wherein, the state of activation of described communication unit is the power source ON state of described communication unit.
[annex 16]
Electronic installation according to any one in annex 1 to 14, wherein, the state of activation of described communication unit is the initialization completion status of described communication unit.
[annex 17]
A kind of communication system, described communication system comprises:
Receiving trap, described receiving trap comprises the electronic installation according to any one in claim 1 to 16; And
Source apparatus, described receiving trap is connected to described source apparatus via telecommunication cable,
Wherein, described source apparatus to described receiving trap supply predetermined voltage, and when receiving the detection signal of described predetermined voltage from described receiving trap, identifies that it is connected to described receiving trap.
[annex 18]
The hot-swappable control method realized in an electronic, described electronic installation comprise external device (ED) via signal cable be connected to and at least comprise the connector of the first pin and the second pin,
Described method comprises:
When signal via the pin except the first pin of described connector and the second pin from when having supplied predetermined voltage from described external device (ED) to described first pin the state that the communication unit that described external device (ED) is imported into is not activated, export the first detection signal indicating and not yet connect with described external device (ED) to described external device (ED) via described second pin; And
When having supplied described predetermined voltage from described external device (ED) to described first pin under the state be activated at described communication unit, be supplied to the signal of the described predetermined voltage of described first pin as the second detection signal via described second pin to described external device (ED) output.
According to the form of annex 1 to 18, control module is to the HDMI receiver IC etc. of the 4th embodiment according to the first embodiment.HDMI receiver IC 13 is examples of control module.Connector and output unit are to the HDMI connector of the 4th embodiment and on-off circuit respectively according to the first embodiment.
Can by using the connection and the detection signal exported from the second pin that are supplied to the predetermined voltage of the first pin to produce instruction and external device (ED) to set up.
This application claims the right of priority of the Taiwan Patent No.101136805 that the PCT/JP2012/74555 and 2012 that submits on September 25th, 2012 submits to 5, on October, itself thus be integrally incorporated in herein by reference.
Claims (18)
1. an electronic installation, described electronic installation comprises:
Connector, external device (ED) is connected to described connector via signal cable, and described connector at least comprises the first pin and the second pin, from described external device (ED) to described first pin supply predetermined voltage;
Controller, described controller comprises communication unit, signal is imported into described communication unit via the pin except described first pin of described connector and described second pin from described external device (ED), and when described communication unit is in state of activation, described controller exports the first signal, and described in described first signal designation, communication unit is in described state of activation; And
Output unit, when also not exporting described first signal, described output unit exports the first detection signal via described second pin to described external device (ED), and described first detection signal instruction does not also connect with described external device (ED).
2. electronic installation according to claim 1, wherein, when also not exporting described first signal, described output unit output low level or earth potential are as described first detection signal.
3. electronic installation according to claim 2, wherein, described output unit comprises switch, and described first signal is imported into described switch as control signal, and during the period not inputting described first signal, described second pin is set to low level or earth potential.
4. electronic installation according to claim 3, wherein:
Described switch comprises the first resistive element to the 3rd resistive element, MOSFET and transistor;
The emitter of described transistor and the source electrode of described MOSFET are grounded;
One end of described first resistive element is connected to one end of described second resistive element, and is connected to described first pin of described connector;
The other end of described first resistive element is connected to the drain electrode of described MOSFET, and is connected to described second pin of described connector;
The other end of described second resistive element is connected to the grid of described MOSFET, and is connected to the collector of described transistor;
Described first signal is supplied to the base stage of described transistor via described 3rd resistive element;
During the period not exporting described first signal, while described MOSFET is switched on, described transistor is cut off; And
During the period exporting described first signal, while described MOSFET is cut off, described transistor is switched on.
5. electronic installation according to claim 3, wherein:
Described switch comprises resistive element and on-off element;
Described on-off element comprises the first terminal to the 3rd terminal, described the first terminal is connected to described first pin of described connector, described second terminal is grounded, and described 3rd terminal is connected to described second pin of described connector via described resistive element; And
During the period exporting described first signal, described the first terminal and described 3rd terminal of described on-off element are connected; And
During the period not exporting described first signal, described second terminal and described 3rd terminal of described on-off element are connected.
6. electronic installation according to claim 1, wherein, when also not exporting described first signal, described output unit exports described first detection signal by discharging described second pin.
7. electronic installation according to claim 6, wherein, when also not exporting described first signal, described output unit arranges release conditions between described first pin and described second pin.
8. electronic installation according to claim 7, wherein:
Described output unit comprises the switch and resistive element that described first signal is imported into as control signal;
Described first pin is connected to one end of described switch via described resistive element, and described second pin is connected to the other end of described on-off element; And
Described switch arranges described release conditions during the period not exporting described first signal between described first pin and described second pin.
9. electronic installation according to claim 7, wherein:
Described output unit comprises the relay and the first resistive element and the second resistive element that described first signal is imported into as control signal;
Described first pin is connected to a terminal of described relay via described first resistive element, and described second pin is connected to the terminal of the other end of described relay; And
Described relay arranges described release conditions during the period not exporting described first signal between described first pin and described second pin.
10. electronic installation according to claim 7, wherein:
Described switch comprises resistive element and on-off element;
One end of described resistive element is connected to the first pin of described connector, and the other end of described resistive element is connected to the second pin of described connector via described on-off element;
During the period exporting described first signal, described on-off element is switched on; And
During the period not exporting described first signal, described on-off element is cut off.
11. electronic installations according to any one in claim 1 to 10, wherein, when exporting described first signal, described output unit exports the second detection signal via described second pin to described external device (ED), and described second detection signal instruction does not also connect with described external device (ED).
12. electronic installations according to claim 11, wherein, during the period exporting described first signal, described output unit exports from described second pin and is supplied to the signal of the predetermined voltage of described first pin as described second detection signal.
13. electronic installations according to any one in claim 1 to 12, comprise: nonvolatile memory further, and described nonvolatile memory stores the resolution of instruction video/sound signal and the identification data of form,
Wherein, described connector comprises described external device (ED) reads described identification data from described nonvolatile memory pin by it further.
14. electronic installations according to any one in claim 1 to 12, wherein:
Described control module stores the resolution of instruction video/sound signal and the identification data of form; And
Described connector comprises described external device (ED) further and accesses described control module to obtain the pin of described identification data by it.
15. electronic installations according to any one in claim 1 to 14, wherein, the state of activation of described communication unit is the power on state of described communication unit.
16. electronic installations according to any one in claim 1 to 14, wherein, the state of activation of described communication unit is the initialization completion status of described communication unit.
17. 1 kinds of communication systems, comprising:
Receiving trap, described receiving trap comprises the electronic installation according to any one in claim 1 to 16; And
Source apparatus, described receiving trap is connected to described source apparatus via telecommunication cable,
Wherein, described source apparatus to described receiving trap supply predetermined voltage, and when receiving the detection signal of described predetermined voltage from described receiving trap, identifies that it is connected to described receiving trap.
18. 1 kinds of hot-swappable control methods realized in an electronic, described electronic installation comprises connector, and external device (ED) is connected to described connector via signal cable, and described connector at least comprises the first pin and the second pin,
Described method comprises:
When signal via the pin except described first pin of described connector and described second pin from the state that the communication unit that described external device (ED) is imported into is not activated from described external device (ED) to described first pin supply predetermined voltage time, export the first detection signal via described second pin to described external device (ED), described first detection signal instruction does not also connect with described external device (ED); And
When supplying described predetermined voltage from described external device (ED) to described first pin under the state be activated at described communication unit, be supplied to the signal of the described predetermined voltage of described first pin as the second detection signal via described second pin to described external device (ED) output.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2012/074555 WO2014049686A1 (en) | 2012-09-25 | 2012-09-25 | Hdmi device, communication system, and hot-plug control method |
| JPPCT/JP2012/074555 | 2012-09-25 | ||
| PCT/JP2013/075682 WO2014050807A1 (en) | 2012-09-25 | 2013-09-24 | Electronic device, communication system, and hot-plug control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104704445A true CN104704445A (en) | 2015-06-10 |
| CN104704445B CN104704445B (en) | 2018-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380050046.8A Active CN104704445B (en) | 2012-09-25 | 2013-09-24 | Electronic device, communication system and hot-swappable control method |
Country Status (4)
| Country | Link |
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| JP (1) | JP5943439B2 (en) |
| CN (1) | CN104704445B (en) |
| TW (1) | TWI528800B (en) |
| WO (1) | WO2014049686A1 (en) |
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Also Published As
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| WO2014049686A1 (en) | 2014-04-03 |
| CN104704445B (en) | 2018-11-09 |
| JP5943439B2 (en) | 2016-07-05 |
| JPWO2014050807A1 (en) | 2016-08-22 |
| TWI528800B (en) | 2016-04-01 |
| TW201414294A (en) | 2014-04-01 |
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Address after: Tokyo, Japan Patentee after: Sharp NEC Display Solutions Co.,Ltd. Address before: Tokyo, Japan Patentee before: NEC DISPLAY SOLUTIONS, Ltd. |