CN205450134U - HDMI -CEC function detection circuitry and HDMI -CEC functional test frock - Google Patents
HDMI -CEC function detection circuitry and HDMI -CEC functional test frock Download PDFInfo
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- CN205450134U CN205450134U CN201521060702.5U CN201521060702U CN205450134U CN 205450134 U CN205450134 U CN 205450134U CN 201521060702 U CN201521060702 U CN 201521060702U CN 205450134 U CN205450134 U CN 205450134U
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Abstract
The utility model discloses a HDMI -CEC function detection circuitry and HDMI -CEC functional test frock, wherein, HDMI -CEC function detection circuitry includes control chip, HDMI interface and comparison output circuit, the power end of HDMI interface is connected with control chip's power end, and control chip's CEC end and the 2nd CEC HDMI interface end are connected, and relatively output circuit's input is connected with the 2nd CEC end of HDMI interface, control chip is used for when the HDMI interface is connected with the equipment of awaiting measuring, on the power that the receipt equipment of awaiting measuring provided to output the first signal to the equipment of awaiting measuring is so that the equipment of awaiting measuring sends the CEC signal, relatively output circuit is used for the CEC signal and the base mark signal that send the equipment of awaiting measuring to carry out the magnitude of voltage relatively to the output compare result, with the instruction await measuring equipment HDMI -CEC normally functioning / unusual. The utility model discloses technical scheme has easy operation's characteristics.
Description
Technical field
This utility model relates to testing circuit technical field, particularly to a kind of HDMI-CEC Function detection circuit and HDMI-CEC functional test frock.
Background technology
Development along with science and technology, HDMI (HighDefinitionMultimediaInterface, HDMI) have become as the standard configuration interface of audio-visual products, again due to by CECConsumerElectronicsControl therein, consumer electronics control) bus can realize one control device multiple multimedia equipments are controlled simultaneously so that the application of CEC bus is more and more extensive.Accordingly, it would be desirable to the HDMI-CEC function of test multimedia equipment is the most normal.
The HDMI-CEC function of traditional multimedia equipment is the most manually tested.Such as test the HDMI-CEC function of DVD: when television set and DVD are all started shooting, closing television machine, observe DVD and be in holding state the most immediately；When television set and DVD are the most standby, opening DVD, observation television machine is started shooting the most immediately.When the duty of DVD and television set meets aforesaid operations change, illustrate that the HDMI-CEC function of DVD is normal, otherwise abnormal.
Although can reach to test the most normal purpose of multimedia equipment HDMI-CEC function by aforesaid operations, but because manual operation is the easiest, so, there is the defect that operation is the easiest in prior art.
Utility model content
Main purpose of the present utility model is to provide a kind of HDMI-CEC Function detection circuit, it is intended to the HDMI-CEC function realizing detection multimedia equipment automatically is the most normal, to improve the simplicity of operation.
For achieving the above object, the HDMI-CEC Function detection circuit that the utility model proposes, including control chip, HDMI and compare output circuit；Described control chip has power end and a CEC end, described HDMI includes power end and for transmitting the 2nd CEC end of CEC signal, the power end of described HDMI is connected with the power end of described control chip, oneth CEC end of described control chip is connected with described HDMI the 2nd CEC end, and the 2nd CEC end of the described input and described HDMI comparing output circuit is connected；Wherein, described control chip, for when described HDMI is connected with Devices to test, receives the power supply electrifying that described Devices to test provides, and exports the first signal extremely described Devices to test, so that described Devices to test sends CEC signal；The described output circuit that compares carries out magnitude of voltage for the CEC signal sent by described Devices to test with reference signal and compares, and exports comparative result, to indicate described Devices to test HDMI-CEC function normal/abnormal.
Described control chip also includes the first signal input part, secondary signal input and the first signal output part；The described output circuit that compares also includes that the first comparing unit, the second comparing unit and the first output circuit, described first comparing unit and the second comparing unit include upper limit reference signal input, lower limit baseband signal input, the 3rd CEC end respectively；Wherein, the first signal input part of described control chip is connected with the outfan of described first comparing unit, and secondary signal input is connected with the outfan of described second comparing unit, and the first signal output part is connected with the input of described first output circuit；Described control chip is for receiving described first comparing unit and the comparison signal of the second comparing unit output, and controls, according to described comparison signal, the signal that described first output circuit output test HDMI-CEC function is normal/abnormal.
Preferably, the described output circuit that compares also includes that the 3rd comparing unit, the 4th comparing unit, the first indicator light circuit and the second indicator light circuit, described 3rd comparing unit and the 4th comparing unit include upper limit reference signal input, lower limit reference signal input, the 4th CEC end respectively；Wherein, the outfan of described 3rd comparing unit is connected with described first indicator light circuit input, and the outfan of described 4th comparing unit is connected with the input of described second indicator light circuit；Described first indicator light circuit is for carrying out state instruction according to the comparison signal of described 3rd comparing unit output；Described second indicator light circuit carries out state instruction for the comparison signal of the output according to described 4th comparing unit.
Preferably, described first comparing unit includes the first resistance, the second resistance, the first diode, the second diode, the first comparator, the second comparator and the first negative circuit；Wherein,
One end of described first resistance connects the first power supply, and the other end of described first resistance inverting input with one end of described second resistance, described first comparator respectively is connected, the other end ground connection of described second resistance；The in-phase input end of described first comparator is connected with the inverting input of described second comparator, described first comparator and the 4th CEC end that link node is described first comparing unit of described second comparator；The in-phase input end ground connection of described second comparator, the outfan of described first comparator is connected with the anode of described first diode, and the negative electrode of described first diode input with the negative electrode of described second diode, described first negative circuit respectively is connected；The anode of described second diode is connected with the outfan of described second comparator, the in-phase input end ground connection of described second comparator；The outfan of described first negative circuit is the outfan of described first comparing unit.
Preferably, described second comparing unit includes the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 3rd diode, the 4th diode, the 3rd comparator, the 4th comparator and the second negative circuit；Wherein,
One end of described 3rd resistance connects second source, and the other end of described 3rd resistance is connected with one end, the inverting input of described 3rd comparator of described 4th resistance respectively, the other end ground connection of described 4th resistance；The in-phase input end of described 3rd comparator is connected with the inverting input of described 4th comparator, described 3rd comparator and the 4th CEC end that link node is described second comparing unit of described 4th comparator；The outfan of described 3rd comparator is connected with the anode of described 3rd diode, the negative electrode of described 3rd diode is connected with negative electrode, the input of described second negative circuit of described 4th diode respectively, and the outfan of described second phase inverter is the outfan of described second comparing unit；The anode of described 4th diode is connected with the outfan of described 4th comparator, and the in-phase input end of described 4th comparator is connected with one end, one end of described 6th resistance of described 5th resistance respectively；The other end of described 5th resistance and the first power supply connect, the other end ground connection of described 6th resistance.
Preferably, described first output circuit is display lamp/LCDs/charactron/oscillograph.
Preferably, described HDMI-CEC Function detection circuit also includes that warning circuit, described warning circuit are connected with the secondary signal outfan of described control chip, and described warning circuit is reported to the police for control based on described control chip.
Preferably, described warning circuit is buzzer.
Preferably, described HDMI also includes interface socket, the 9th resistance, the tenth resistance and the 11st resistance；Wherein, the power end of described interface socket is connected with one end of described 9th resistance and one end of described tenth resistance respectively；The described other end of the 9th resistance is connected with the start end of described interface socket, the other end of described tenth resistance is connected with one end of described 11st resistance, described tenth resistance and the power end that link node is described HDMI of described 11st resistance, the other end ground connection of described 11st resistance；The signal end of described interface socket is the 2nd CEC end of described HDMI.
This utility model also proposes a kind of HDMI-CEC functional test frock, and described HDMI-CEC functional test frock includes HDMI-CEC Function detection circuit as above；Wherein said HDMI-CEC Function detection circuit includes control chip, HDMI and compares output circuit；Described control chip has power end and a CEC end, described HDMI includes power end and for transmitting the 2nd CEC end of CEC signal, the power end of described HDMI is connected with the power end of described control chip, oneth CEC end of described control chip is connected with the 2nd CEC end of described HDMI, and the 2nd CEC end of the described input and described HDMI comparing output circuit is connected；Described control chip, for when described HDMI is connected with Devices to test, receives the power supply electrifying that described Devices to test provides, and exports the first signal extremely described Devices to test, so that described Devices to test sends CEC signal；Described comparing output circuit, the CEC signal for being sent by described Devices to test carries out magnitude of voltage with reference signal and compares, and exports comparison signal, to indicate described Devices to test HDMI-CEC function normal/abnormal.
Technical solutions of the utility model send CEC signal by using HDMI to be connected with Devices to test to trigger Devices to test, the CEC signal that relatively equipment to be detected is sent by output circuit carries out magnitude of voltage with reference signal and compares, and export comparative result, thus the HDMI-CEC function indicating Devices to test is normal/abnormal.Achieve the automatic detection of the HDMI-CEC function of multimedia equipment.Accordingly, with respect to prior art, technical solutions of the utility model have feature easy and simple to handle.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only embodiments more of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to the structure shown in these accompanying drawings.
Fig. 1 is the high-level schematic functional block diagram of this utility model HDMI-CEC Function detection circuit one embodiment；
Fig. 2 is the first comparing unit and the electrical block diagram of the second comparing unit comparing output circuit in Fig. 1；
Fig. 3 is the electrical block diagram of HDMI in Fig. 1；
Fig. 4 is the high-level schematic functional block diagram of this utility model HDMI-CEC Function detection another embodiment of circuit；
Fig. 5 is the high-level schematic functional block diagram of this utility model HDMI-CEC another embodiment of Function detection circuit.
Drawing reference numeral illustrates:
The realization of this utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, are described further referring to the drawings.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.
The description relating to " first ", " second " etc. in this utility model is only used for describing purpose, and it is not intended that indicate or imply its relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or implicitly include at least one this feature.Additionally; technical scheme between each embodiment can be combined with each other; but must be based on those of ordinary skill in the art are capable of; when technical scheme combination occur conflicting maybe cannot realize time will be understood that the combination of this technical scheme does not exists, the most not this utility model require protection domain within.
The utility model proposes a kind of HDMI-CEC Function detection circuit.
Referring to figs. 1 through 5, Fig. 1 is the high-level schematic functional block diagram of this utility model HDMI-CEC Function detection circuit one embodiment；Fig. 2 is the first comparing unit and the electrical block diagram of the second comparing unit comparing output circuit in Fig. 1；Fig. 3 is the electrical block diagram of HDMI in Fig. 1；Fig. 4 is the high-level schematic functional block diagram of this utility model HDMI-CEC Function detection another embodiment of circuit；Fig. 5 is the high-level schematic functional block diagram of this utility model HDMI-CEC another embodiment of Function detection circuit.
In this utility model embodiment, this HDMI-CEC Function detection circuit includes control chip 30, HDMI 10 and compares output circuit 20；Described control chip 30 has power end and a CEC end, described HDMI 10 includes power end and for transmitting the 2nd CEC end of CEC signal, the power end of described HDMI 10 is connected with the power end of described control chip 30, oneth CEC end of described control chip 30 is connected with described HDMI 10 the 2nd CEC end, and the 2nd CEC end of the described input and described HDMI 10 comparing output circuit 20 is connected；Wherein, described control chip 30 for when described HDMI 10 is connected with Devices to test, receives the power supply of described Devices to test offer as test starting signal, powers on and export the first signal extremely described Devices to test, so that described Devices to test sends CEC signal；The described output circuit 20 that compares carries out magnitude of voltage for the CEC signal sent by described Devices to test with reference signal and compares, and exports comparative result, to indicate described Devices to test HDMI-CEC function normal/abnormal.
When the HDMI-CEC function needing detection Devices to test is the most normal, the HDMI of described HDMI-CEC Function detection circuit is connected with Devices to test, described control chip 30 obtains test starting signal by described HDMI 10 at described Devices to test, and described control chip 30 starts.Oneth CEC end of described control chip 30 sends first signal of telecommunication, described first signal of telecommunication is by described HDMI 10 transmission extremely described Devices to test, described Devices to test exports CEC signal after receiving described first signal of telecommunication, and this CEC signal is transmitted separately to a CEC end of described control chip 30 and the described input comparing output circuit 20 through described HDMI 10.On the one hand, a CEC end of described control chip 30 detects that this signal is CEC signal, and judges the level state of this CEC signal.On the other hand, described CEC signal is carried out magnitude of voltage with reference signal and compares by the described output circuit 20 that compares, in the present embodiment, when the magnitude of voltage of described CEC signal is in the range of voltage values of described reference signal, the described outfan output high level signal comparing output circuit 20 is normal with the HDMI-CEC function indicating described Devices to test；When described CEC magnitude of voltage is not in the range of voltage values of described reference signal, the described outfan output low level signal comparing output circuit 20, to indicate the HDMI-CEC dysfunction of described Devices to test.
Technical solutions of the utility model trigger, by using HDMI 10 to be connected with Devices to test, the CEC signal that Devices to test sends, the CEC signal that relatively Devices to test is sent by output circuit 20 carries out magnitude of voltage with reference signal and compares, and export comparative result, thus the HDMI-CEC function indicating Devices to test is normal/abnormal.Achieve the automatic detection of the HDMI-CEC function of multimedia equipment.Accordingly, with respect to prior art, technical solutions of the utility model have feature easy and simple to handle.
Preferably, described HDMI 10 includes interface socket the 101, the 9th resistance R9, the tenth resistance R10 and the 11st resistance R11；The power end (VCC end as shown in Figure 3 is used for inputting 5V voltage) of described interface socket 101 is connected with one end of described 9th resistance R9 and one end of described tenth resistance R10 respectively；The other end of described 9th resistance R9 is connected with the start end (HPD end as shown in Figure 3) of described interface socket 101, the other end of described tenth resistance R10 is connected with one end of described 11st resistance R11, the power end that link node is described HDMI 10 (output 3.3V voltage signal end as shown in Figure 3) of described tenth resistance R10 and described 11st resistance R11, the other end ground connection of described 11st resistance R11；The signal end of described interface socket 101 is the 2nd CEC end (CEC as shown in Figure 3) of described HDMI 10.
When described HDMI-CEC Function detection circuit is connected with described Devices to test, the power end input 5V voltage of described interface socket 101, described 9th resistance R9, described tenth resistance R10 and described 11st resistance R11 constitute bleeder circuit, the start end of described interface socket 101 is obtained by described 9th resistance R9 and starts voltage, and described HDMI 10 starts.Meanwhile, the voltage of the power end output 3.3V of described HDMI 10 is also fed into the power end of above-mentioned control chip 30.The HDMI-CEC Function detection circuit that described HDMI 10 can conveniently the utility model proposes and the connection of multimedia equipment to be detected.
Preferably, the described output circuit that compares includes the first comparing unit the 201, second comparing unit 202 and the first output circuit 210.
Wherein, described first comparing unit 201 includes the first resistance R1, the second resistance R2, the first diode D1, the second diode D2, the first comparator U1, the second comparator U2 and the first negative circuit；One end of described first resistance R1 connects the first power supply, and the other end of described first resistance R1 inverting input with one end of described second resistance R2, described first comparator U1 respectively is connected, the other end ground connection of described second resistance R2；The in-phase input end of described first comparator U1 is connected with the inverting input of described second comparator U2, the 4th CEC end that link node is described first comparing unit 201 of described first comparator U1 and described second comparator U2；The in-phase input end ground connection of described second comparator U2, the outfan of described first comparator U1 is connected with the anode of described first diode D1, and the negative electrode of described first diode D1 is connected with negative electrode, the input of described first negative circuit of described second diode D2 respectively；The anode of described second diode D2 is connected with the outfan of described second comparator U2, the in-phase input end ground connection of described second comparator U2；The outfan of described first negative circuit is the outfan (OUT1 as shown in Figure 2) of described first comparing unit 201.
Described second comparing unit 202 includes the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 3rd diode D3, the 4th diode D4, the 3rd comparator U3, the 4th comparator U4 and the second negative circuit；One end of described 3rd resistance R3 connects second source, the other end of described 3rd resistance R3 is connected with one end, the inverting input of described 3rd comparator U3 of described 4th resistance R4 respectively, the in-phase input end of described 3rd comparator U3 is connected with the inverting input of described 4th comparator U4, the 4th CEC end that link node is described second comparing unit 202 of described 3rd comparator U3 and described 4th comparator U4, the other end ground connection of described 4th resistance R4；The outfan of described 3rd comparator U3 is connected with the anode of described 3rd diode D3, the negative electrode of described 3rd diode D3 is connected with negative electrode, the input of described second negative circuit of described 4th diode D4 respectively, and the outfan of described second phase inverter is the outfan (OUT2 as shown in Figure 2) of described second comparing unit 202；The anode of described 4th diode D4 is connected with the outfan of described 4th comparator U4, and the in-phase input end of described 4th comparator U4 is connected with one end, one end of described 6th resistance R6 of described 5th resistance R5 respectively；The other end of described 5th resistance R5 is connected with described first power supply, the other end ground connection of described 6th resistance R6.
Described first negative circuit includes the 7th resistance R7, the 8th resistance R8 and the first audion Q1；The input that one end is described first negative circuit of described 7th resistance R7, the other end of described 7th resistance R7 is connected with the base stage of described first audion Q1, the grounded emitter of described first audion Q1, the colelctor electrode of described first audion Q1 is connected with one end of described 8th resistance R8, the outfan that link node is described first negative circuit of described first audion Q1 and described 8th resistance R8, the other end of described 8th resistance R8 is connected with second source.
It should be noted that in the present embodiment, the circuit structure of described second negative circuit is identical with the circuit structure of described first negative circuit.It is fixedly installed additionally, the parameter of described electronic devices and components is all the communication protocol according to CEC signal.Specifically, the magnitude of voltage of described first power supply output is 5V, and the magnitude of voltage of described second source output is 3.3V.The resistance of described first resistance R1 is 15.4K, the resistance of described second resistance R2 is 2.1K, the resistance of described 3rd resistance R3 is 3K, the resistance of described 4th resistance R4 is 7.87K, the resistance of described 5th resistance R5 is 10K, the resistance of described 6th resistance R6 is 10K, and the resistance of described 7th resistance R7 is 10K, and the resistance of described 8th resistance R8 is 10K.
When described compare output circuit 20 start time, on the one hand, the input voltage of the in-phase input end of described second comparator U2 is 0V；Described first resistance R1 constitutes bleeder circuit with described second resistance R2 so that the input voltage of the inverting input of described first comparator U1 is 0.6V.On the other hand, described 3rd resistance R3 constitutes bleeder circuit with described 4th resistance R4 so that the input voltage of the inverting input of described 3rd comparator U3 is 3.63V；Described 5th resistance R5 constitutes bleeder circuit with described 6th resistance R6 so that the input voltage of the in-phase input end of described 3rd comparator U3 is 2.5V.The output state corresponding relation of the magnitude of voltage size of described CEC signal and described first comparing unit 201 and the second comparing unit 202 is with reference to following table:
| CEC signal voltage value T (V) | T>0 | 0<T<0.6 | 0.6<T<2.5 | 2.5<T<3.63 | T>3.63 |
| First negative circuit input level | H | L | H | H | H |
| First negative circuit outfan level | L | H | L | L | L |
| First comparing unit outfan level | L | H | L | L | L |
| Second negative circuit input level | H | H | H | L | H |
| Second negative circuit outfan level | L | L | L | H | L |
| Second comparing unit outfan level | L | L | L | H | L |
When the magnitude of voltage of described CEC signal is less than 0V, outfan output low level L of described first comparator U1, the outfan output high level H of described second comparator U2, owing to diode has the unidirectional general character, described first diode D1 cut-off, described second diode D2 conducting.Outfan output low level L of described first negative circuit.Meanwhile, outfan output low level L of described 3rd comparator U3, the outfan output high level H of described 4th comparator U4, described 3rd diode D3 cut-off, described 4th diode D4 conducting, the input of described second negative circuit obtains high level H, outfan output low level L of described second negative circuit.
When between the magnitude of voltage of described CEC signal is at 0V to 0.6V, outfan output low level L of described first comparator U1, outfan output low level L of described second comparator U2, described first diode D1 cut-off, described second diode D2 cut-off.The input of described first negative circuit obtains low level L, the outfan output high level H of described first negative circuit.Meanwhile, outfan output low level L of described 3rd comparator U3, the outfan output high level H of described 4th comparator U4, described 3rd diode D3 cut-off, described 4th diode D4 conducting.The input of described second negative circuit obtains high level H, outfan output low level L of described second negative circuit.
When between the magnitude of voltage of described CEC signal is at 0.6 to 2.5V, the outfan output high level H of described first comparator U1, outfan output low level L of described second comparator U2, described first diode D1 conducting, described second diode D2 cut-off.The input of described first negative circuit obtains high level H, outfan output low level L of described first negative circuit.Meanwhile, outfan output low level L of described 3rd comparator U3, the outfan output high level H of described 4th comparator U4, described 3rd diode D3 cut-off, described 4th diode D4 conducting.The input of described second negative circuit obtains high level H, outfan output low level L of described second negative circuit.
When between the magnitude of voltage of described CEC signal is at 2.5V to 3.63V, the outfan output high level H of described first comparator U1, outfan output low level L of described second comparator U2, described first diode D1 conducting, described second diode D2 cut-off.The input of described first negative circuit obtains high level H, outfan output low level L of described first negative circuit.Meanwhile, outfan output low level L of described 3rd comparator U3, outfan output low level L of described 4th comparator U4, described 3rd diode D3 cut-off, described 4th diode D4 cut-off, the input of described second negative circuit obtains low level L, the outfan output high level H of described second negative circuit.
When the magnitude of voltage of described CEC signal is more than 3.63V, the outfan output high level H of described first comparator U1, outfan output low level L of described second comparator U2, described first diode D1 conducting, described second diode D2 cut-off, the input of described first negative circuit obtains high level H, outfan output low level L of described first negative circuit.Meanwhile, the outfan output high level H of described 3rd comparator U3, outfan output low level L of described 4th comparator U4, described 3rd diode D3 conducting, described 4th diode D4 cut-off.The input of described second negative circuit obtains high level H, outfan output low level L of described second negative circuit.
Additionally, the input of described first output circuit 210 is connected with the signal output part of described control chip 30；Described first output circuit 210 is based on described control chip 30 controls the signal that output test HDMI-CEC function is normal/abnormal.Wherein, described first output circuit 30 can be the circuit structure that LCDs, charactron and oscillograph etc. have display function, and in the present embodiment, described first output circuit 210 is the first display lamp (not shown).Specifically, when HDMI-CEC function Devices to test being detected is normal, it is bright that described control chip 30 controls described first display lamp；When the HDMI-CEC dysfunction of equipment being detected, described control chip 30 controls described first display lamp and goes out.It is noted that described first display lamp can include red light and green light, when HDMI-CEC function Devices to test being detected is normal, described green light, when the HDMI-CEC dysfunction of Devices to test being detected, when red.For saving production cost, the present embodiment is preferably used a display lamp.Certainly, for further enhancing the ease-to-operate of HDMI-CEC Function detection circuit, also warning circuit 40 can be set up, in the present embodiment, described warning circuit 40 is buzzer (not shown), and the controlled end of described buzzer is connected with the secondary signal outfan of described control chip 30, when the HDMI-CEC dysfunction of Devices to test being detected, described buzzer receives the control signal of the secondary signal outfan output of described control chip 30 and pipes, to cause the vigilance of people.It is noted that in the present embodiment, the control chip that model is STM32F105 of described control chip 30 realizes, certainly, according to actual needs, it is possible to by the chip of this other model of selection, such as the chip of 51 series.
The described rating unit comparing output circuit 20 is divided into described first comparing unit 201 and the second comparing unit 202, CEC signal can be compared with the magnitude of voltage of low level reference signal and the magnitude of voltage of high level reference signal simultaneously, thus strengthen the accuracy of the testing result of the HDMI-CEC function of described Devices to test.Described first output circuit 210, can more intuitively reflect the whether normal of Devices to test HDMI-CEC function.Set up described warning circuit 40, the state of the HDMI-CEC function of Devices to test can be known with more convenient tester.
Hereinafter, in conjunction with Fig. 1 to Fig. 4, the work process of HDMI-CEC Function detection circuit in the present embodiment is described:
The HDMI 10 of described HDMI-CEC Function detection circuit is connected with Devices to test, described HDMI 10 obtains 5V voltage at described Devices to test, described 9th resistance R9, described tenth resistance R10 and described 11st resistance R11 constitute bleeder circuit, described HDMI 10 exports the power end of 3.3V voltage extremely described control chip 3030, described control chip 30 obtains test starting signal, and described control chip 30 starts.Oneth CEC end of described control chip 30 exports first signal of telecommunication extremely described Devices to test, and described Devices to test sends a CEC end of CEC signal extremely described control chip 30 to show response.On the one hand, a CEC termination of described control chip 30 receives described CEC signal, and judges the level state of this CEC signal.On the other hand, the input of described first comparing unit 201 and described second comparing unit 202 is respectively received described CEC signal.When between the range of voltage values of described CEC signal is at 0V to 0.6V, the outfan output high level of described first comparing unit 201, when between the range of voltage values of described CEC signal is at 2.5V to 3.63V, the outfan output high level of described second comparing unit 202, otherwise, described first comparing unit 201 and outfan all output low levels of described second comparing unit 202.It is low level when described control chip 30 is detected simultaneously by described CEC signal, when the outfan of described first comparing unit 201 exports high level, illustrates that described CEC signal low level is qualified；It is high level when described control chip 30 is detected simultaneously by described CEC signal, when the outfan of described second comparing unit 202 exports high level, illustrates that described CEC signal high level is qualified.When described CEC signal low level and high level are the most qualified, it is bright that described control chip 30 controls described first display lamp, and otherwise, described control chip 30 controls described first display lamp and goes out, and meanwhile, described buzzer song is reported to the police.
Preferably, please also refer to Fig. 5, the described output circuit 20 that compares includes that the 3rd comparing unit the 203, the 4th comparing unit the 204, first indicator light circuit 220 and the second indicator light circuit 230, described 3rd comparing unit 203 and the 4th comparing unit 204 include upper limit reference signal input, lower limit reference signal input, the 4th CEC end respectively；The outfan of described 3rd comparing unit 203 is connected with described first indicator light circuit 220 input, and the outfan of described 4th comparing unit 204 is connected with the input of described second indicator light circuit 230；Described first indicator light circuit 220 and described second indicator light circuit 230 are based respectively on the output signal output instruction of described 3rd comparing unit 203 and described 4th comparing unit 204 and test the signal that HDMI-CEC function is normal/abnormal.
It should be noted that in the present embodiment, the circuit structure of described 3rd comparing unit 203 arranges the most identical with the circuit structure of described first comparing unit 201 and parameter；The circuit structure of described 4th comparing unit 204 arranges the most identical with the circuit structure of described second comparing unit 202 and parameter.The circuit structure of described first indicator light circuit 220 and described second indicator light circuit 230 is equally with reference to the first above-mentioned output circuit 210, preferably, in the present embodiment, described first indicator light circuit 220 and described second indicator light circuit 230 are respectively the second display lamp (not shown) and the 3rd display lamp (not shown).
Hereinafter, in conjunction with Fig. 1 to Fig. 5, the work process of HDMI-CEC Function detection circuit in the present embodiment is described:
The HDMI of described HDMI-CEC Function detection circuit is connected with Devices to test, described HDMI 10 obtains 5V voltage at described Devices to test, described 9th resistance R9, described tenth resistance R10 and described 11st resistance R11 constitute bleeder circuit, the power end of the power end output 3.3V voltage extremely described control chip 30 of described HDMI 10, described control chip 30 obtains test starting signal, and described control chip 30 starts.Oneth CEC end of described control chip 30 exports first signal of telecommunication extremely described Devices to test, and described Devices to test sends a CEC end of CEC signal extremely described control chip 30 to show response.On the one hand, a CEC termination of described control chip 30 receives described CEC signal, and judges the level state of this CEC signal.On the other hand, the input of described 3rd comparing unit 203 receives described CEC signal.When between the range of voltage values of described CEC signal is at 0V to 0.6V, described control chip 30 judges that current CEC signal is low level, meanwhile, the outfan output high level signal of described 3rd comparing unit 203 powers to described second display lamp, described second display lamp is bright, when between the range of voltage values of described CEC signal is not at 0V to 0.6V, the outfan output low level signal of described 3rd comparing unit 203, described second display lamp goes out.
When between the range of voltage values of described CEC signal is at 2.5V to 3.63V, described control chip 30 judges that current CEC signal is high level, meanwhile, the outfan output high level signal of described 4th comparing unit 204 powers to described 3rd display lamp, described 3rd display lamp is bright, when between the range of voltage values of described CEC signal is not at 2.5V to 3.63V, the outfan output low level signal of described 4th comparing unit 204, described 3rd display lamp goes out.Owing to the low and high level state of described CEC signal changes fast, human eye is detectable the flicker of display lamp, therefore, when observer simultaneously observes described second display lamp and described 3rd display lamp is the brightest, illustrate that the low level of described CEC signal is between 0V to 0.6V, the high level of described CEC signal is between 2.5V to 3.63V, and the HDMI-CEC function of Devices to test is normal.And when observer observes described second display lamp or described 3rd display lamp does not works, the HDMI-CEC dysfunction of Devices to test is described.It is understood that the present embodiment also can add warning circuit, to cause the vigilance of people.
This utility model also proposes a kind of HDMI-CEC functional test frock, this HDMI-CEC functional test frock HDMI-CEC as above Function detection circuit, the concrete structure of this HDMI-CEC Function detection circuit is with reference to above-described embodiment, owing to this HDMI-CEC functional test frock have employed whole technical schemes of above-mentioned all embodiments, the most at least having all beneficial effects that the technical scheme of above-described embodiment is brought, this is no longer going to repeat them.Wherein, described HDMI-CEC Function detection circuit includes control chip 30, HDMI 10 and compares output circuit 20；Described control chip 30 has power end, CEC end and a signal input part, described HDMI 10 includes power end and for transmitting the 2nd CEC end of CEC signal, the power end of described HDMI 10 is connected with the power end of described control chip 30, oneth CEC end of described control chip 30 is connected with the 2nd CEC end of described HDMI 10,2nd CEC end of the described input and described HDMI 10 comparing output circuit 20 is connected, and the signal input part of the described outfan and described control chip 30 comparing output circuit 20 is connected；Described control chip 30, for when described HDMI 10 is connected with Devices to test, receives the power supply electrifying that described Devices to test provides, and exports the first signal extremely described Devices to test, so that described Devices to test sends CEC signal；The described output circuit 20 that compares carries out magnitude of voltage for the CEC signal sent by described Devices to test with reference signal and compares, and exports comparative result, to indicate described Devices to test HDMI-CEC function normal/abnormal.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every under inventive concept of the present utility model; utilize the equivalent structure transformation that this utility model description and accompanying drawing content are made, or directly/be indirectly used in other relevant technical fields and be included in scope of patent protection of the present utility model.
Claims (10)
1. a HDMI-CEC Function detection circuit, it is characterised in that include control chip, HDMI and compare output circuit；Described control chip has power end and a CEC end, described HDMI includes power end and for transmitting the 2nd CEC end of CEC signal, the power end of described HDMI is connected with the power end of described control chip, oneth CEC end of described control chip is connected with the 2nd CEC end of described HDMI, and the 2nd CEC end of the described input and described HDMI comparing output circuit is connected；Wherein,
Described control chip, for when described HDMI is connected with Devices to test, receives the power supply of described Devices to test offer as test starting signal, powers on and export the first signal extremely described Devices to test, so that described Devices to test sends CEC signal；
Described comparing output circuit, the CEC signal for being sent by described Devices to test carries out magnitude of voltage with reference signal and compares, and exports comparison signal, to indicate described Devices to test HDMI-CEC function normal/abnormal.
2. HDMI-CEC Function detection circuit as claimed in claim 1, it is characterised in that described control chip also includes the first signal input part, secondary signal input and the first signal output part；The described output circuit that compares also includes that the first comparing unit, the second comparing unit and the first output circuit, described first comparing unit and the second comparing unit include upper limit reference signal input, lower limit baseband signal input, the 3rd CEC end respectively；Wherein,
First signal input part of described control chip is connected with the outfan of described first comparing unit, and secondary signal input is connected with the outfan of described second comparing unit, and the first signal output part is connected with the input of described first output circuit；
Described control chip is for receiving described first comparing unit and the comparison signal of the second comparing unit output, and controls, according to described comparison signal, the signal that described first output circuit output test HDMI-CEC function is normal/abnormal.
3. HDMI-CEC Function detection circuit as claimed in claim 1, it is characterized in that, the described output circuit that compares also includes that the 3rd comparing unit, the 4th comparing unit, the first indicator light circuit and the second indicator light circuit, described 3rd comparing unit and the 4th comparing unit include upper limit reference signal input, lower limit reference signal input, the 4th CEC end respectively；Wherein,
The outfan of described 3rd comparing unit is connected with described first indicator light circuit input, and the outfan of described 4th comparing unit is connected with the input of described second indicator light circuit；
Described first indicator light circuit is for carrying out state instruction according to the comparison signal of described 3rd comparing unit output；
Described second indicator light circuit carries out state instruction for the comparison signal of the output according to described 4th comparing unit.
4. HDMI-CEC Function detection circuit as claimed in claim 2, it is characterised in that described first comparing unit includes the first resistance, the second resistance, the first diode, the second diode, the first comparator, the second comparator and the first negative circuit；Wherein,
One end of described first resistance connects the first power supply, and the other end of described first resistance inverting input with one end of described second resistance, described first comparator respectively is connected, the other end ground connection of described second resistance；
The in-phase input end of described first comparator is connected with the inverting input of described second comparator, described first comparator and the 4th CEC end that link node is described first comparing unit of described second comparator；
The in-phase input end ground connection of described second comparator, the outfan of described first comparator is connected with the anode of described first diode, and the negative electrode of described first diode input with the negative electrode of described second diode, described first negative circuit respectively is connected；
The anode of described second diode is connected with the outfan of described second comparator, the in-phase input end ground connection of described second comparator；The outfan of described first negative circuit is the outfan of described first comparing unit.
5. HDMI-CEC Function detection circuit as claimed in claim 2, it is characterized in that, described second comparing unit includes the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 3rd diode, the 4th diode, the 3rd comparator, the 4th comparator and the second negative circuit；Wherein,
One end of described 3rd resistance connects second source, and the other end of described 3rd resistance is connected with one end, the inverting input of described 3rd comparator of described 4th resistance respectively, the other end ground connection of described 4th resistance；
The in-phase input end of described 3rd comparator is connected with the inverting input of described 4th comparator, described 3rd comparator and the 4th CEC end that link node is described second comparing unit of described 4th comparator；
The outfan of described 3rd comparator is connected with the anode of described 3rd diode, the negative electrode of described 3rd diode is connected with negative electrode, the input of described second negative circuit of described 4th diode respectively, and the outfan of described second phase inverter is the outfan of described second comparing unit；
The anode of described 4th diode is connected with the outfan of described 4th comparator, and the in-phase input end of described 4th comparator is connected with one end, one end of described 6th resistance of described 5th resistance respectively；
The other end of described 5th resistance and the first power supply connect, the other end ground connection of described 6th resistance.
6. HDMI-CEC Function detection circuit as claimed in claim 2, it is characterised in that described first output circuit is display lamp/LCDs/charactron/oscillograph.
7. HDMI-CEC Function detection circuit as claimed in claim 2, it is characterized in that, described HDMI-CEC Function detection circuit also includes warning circuit, described warning circuit is connected with the secondary signal outfan of described control chip, and described warning circuit is reported to the police for control based on described control chip.
8. HDMI-CEC Function detection circuit as claimed in claim 7, it is characterised in that described warning circuit is buzzer.
9. the HDMI-CEC Function detection circuit as described in claim 1 to 8 any one, it is characterised in that described HDMI also includes interface socket, the 9th resistance, the tenth resistance and the 11st resistance；Wherein,
The power end of described interface socket is connected with one end of described 9th resistance and one end of described tenth resistance respectively；
The described other end of the 9th resistance is connected with the start end of described interface socket, the other end of described tenth resistance is connected with one end of described 11st resistance, described tenth resistance and the power end that link node is described HDMI of described 11st resistance, the other end ground connection of described 11st resistance；
The signal end of described interface socket is the 2nd CEC end of described HDMI.
10. a HDMI-CEC functional test frock, it is characterised in that described HDMI-CEC functional test frock includes the HDMI-CEC Function detection circuit as described in any one of claim 1 to 9.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109522260A (en) * | 2018-12-20 | 2019-03-26 | 苏州路之遥科技股份有限公司 | A kind of monobus communication signal repeat circuit |
| CN109558350A (en) * | 2018-11-20 | 2019-04-02 | 海信（山东）空调有限公司 | A kind of program monitoring multiplexing port, control method and household electrical appliance |
| CN110557592A (en) * | 2019-09-16 | 2019-12-10 | 福州瑞芯微电子股份有限公司 | HDMI multimedia data quality evaluation method, device and system |
| CN115802096A (en) * | 2023-01-10 | 2023-03-14 | 深圳市德晟达电子科技有限公司 | Multi-path HDMI cooperative control method and system |
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2015
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109558350A (en) * | 2018-11-20 | 2019-04-02 | 海信（山东）空调有限公司 | A kind of program monitoring multiplexing port, control method and household electrical appliance |
| CN109558350B (en) * | 2018-11-20 | 2023-04-14 | 海信空调有限公司 | Program monitoring multiplexing port, control method and household appliance |
| CN109522260A (en) * | 2018-12-20 | 2019-03-26 | 苏州路之遥科技股份有限公司 | A kind of monobus communication signal repeat circuit |
| CN110557592A (en) * | 2019-09-16 | 2019-12-10 | 福州瑞芯微电子股份有限公司 | HDMI multimedia data quality evaluation method, device and system |
| CN115802096A (en) * | 2023-01-10 | 2023-03-14 | 深圳市德晟达电子科技有限公司 | Multi-path HDMI cooperative control method and system |
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