CN103491412A - MHL device identification circuit with standby charging function - Google Patents
MHL device identification circuit with standby charging function Download PDFInfo
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- CN103491412A CN103491412A CN201310448006.0A CN201310448006A CN103491412A CN 103491412 A CN103491412 A CN 103491412A CN 201310448006 A CN201310448006 A CN 201310448006A CN 103491412 A CN103491412 A CN 103491412A
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Abstract
The invention provides an MHL device identification circuit with a standby charging function, and the MHL device identification circuit is suitable for detecting and charging an MHL device in a digital multimedia receiving device. The MHL device identification circuit comprises an MHL identification unit, wherein the MHL identification unit comprises the identification signal input end and the identification signal output end and further comprises a standby output unit. The detection signal input end of the standby output unit is connected to the identification signal input end of the MHL identification unit through a master control module of the digital multimedia receiving device, and the detection signal output end of the standby output unit is connected to the MHL_CBUS signal end of the MHL device. By the adoption of the MHL device identification circuit, the digital multimedia receiving device can also charge the MHL device normally in the standby process.
Description
Technical field
The present invention relates to a kind of MHL recognition of devices circuit, relate in particular to a kind of recognition of devices of the MHL with standby charge function circuit.
Background technology
Develop rapidly along with the Contemporary Digital technology, most of digital multimedia receiving apparatus, all with HDMI (High Definition Multimedia Interface) (HDMI, High Definition Multimedia Interface), the HDMI interface is a kind of digital signal interface relatively more commonly used in current audio frequency and video transmitting and receiving device, applies very extensive.In addition, development along with the mobile terminal technology, it is more simple and convenient that the processing of digital stream media becomes, for adapting to interconnecting of mobile terminal and digital multimedia receiving apparatus (as TV), a kind of novel interconnection technique mobile terminal high-definition audio and video standard interface (MHL, Mobile High-Definition Link) has appearred on mobile terminal.MHL is a kind of audio-visual standard interface that connects portable consumer electronic device, relies on the MHL connection cable, the high definition stream media content that digital multimedia receiving apparatus can be exported by the MHL interface of HDMI interface mobile terminal receive; In addition, multimedia display equipment can charge to mobile terminal by the MHL connection cable.
According to the MHL standard, the MHL connection cable adopts 6 connection holding wires to realize interconnecting, these 6 connecting line signals are TMDS_DO+, TMDS_DO-, SCL, MHL_CBUS, MHL_CD_SENSE and MHL_VBUS, HDMI and MHL interface definition are as shown in Figure 1, digital multimedia receiving apparatus (for example receives MHL equipment by the HDMI interface, the high definition stream media content of MHL interface output mobile terminal), wherein, MHL equipment TMDS_DO+ and TMDS_DO-signal end are connected respectively to PIN7 and the PIN9 of digital multimedia receiving apparatus HDMI interface, the SCL signal end is connected to the PIN15 of digital multimedia receiving apparatus HDMI interface, the MHL_VBUS signal end is connected to the PIN18 of digital multimedia receiving apparatus HDMI interface, the MHL_CBUS signal end is connected to the PIN19 of digital multimedia receiving apparatus HDMI interface.
As Fig. 1, when adopting HDMI equipment as input equipment, that connect HDMI interface PIN2 is GND, and now the PIN2 pin is low level; When multimedia receiver connects MHL equipment by the MHL wire rod, the PIN2 pin is connected to the MHL_CD_SENSE signal end of MHL equipment, and now the PIN2 pin is high level (being greater than 1.5V) input.
The MHL compatible with HDMI is during as the digital multimedia receiving apparatus input signal, the MHL_CBUS signal end of MHL equipment and the hot plug of HDMI equipment detect (HPD, Hot Plug Detect) functional pin shares same pin, the i.e. PIN19 of digital multimedia receiving apparatus HDMI interface.When the identification input signal while being the HDMI signal, as shown in Figure 2, whether the output of HPD functional pin PIN19 will send the foundation of TMDS signal as HDMI equipment to digital multimedia receiving apparatus.HPD is from a detection signal of digital multimedia receiving apparatus (as TV) output, if the HDMI equipment Inspection is output as high level (being greater than 1.5V) to the HPD pin, will sends the TMDS signal and communicate, and low level (being less than 0.8V) stops sending the TMDS signal.
In prior art, MHL equipment and digital multimedia receiving apparatus is connected as shown in Figure 3.MHL equipment is connected to signal processing module, main control module and the MHL identification circuit of digital multimedia receiving apparatus by the HDMI interface of digital multimedia receiving apparatus, thereby the MHL identification circuit is the insertion for identifying MHL equipment to be communicated and charges, main control module is controlled the signal of MHL equipment and the input of MHL identification circuit, and the signal processing module of digital multimedia receiving apparatus carries out the signal processing for the signal of MHL equipment and main control module input.The MHL identification circuit comprises triode Q4, triode Q5, triode Q6 and metal-oxide-semiconductor Q3, the grid of metal-oxide-semiconductor Q3 (as the signal input part ID_INPUT of MHL identification circuit) connects the PIN2 of HDMI interface, connect the MHL_CD_SENSE signal end of MHL by the PIN2 of HDMI interface, source ground, drain electrode is connected to 5V voltage by resistance R 3; The base stage of described triode Q4 is connected to the drain electrode of described metal-oxide-semiconductor Q3 by resistance R 4, grounded emitter, and collector electrode is connected to voltage (5V) by resistance R 5, the R6 of series connection; The base stage of triode Q5 is connected to the resistance R 5 of series connection, the tie point of R6, and emitter is connected to voltage (5V), and collector electrode is by the collector electrode of resistance R 7 connecting triode Q6; The base stage of triode Q6 connects the HPD control end HPD_CONTROL of main control module by resistance R 8, collector electrode is connected to the collector electrode of described triode Q5, grounded emitter by resistance R 7; The collector electrode of triode Q6 (as the identification signal output ID_OUTPUT of MHL identification circuit) connects the MHL_CBUS signal end of MHL by the PIN19 of HDMI interface.
When HDMI equipment inserts digital multimedia receiving apparatus, the PIN2 of digital multimedia receiving apparatus HDMI interface is connected to the GND pin of HDMI, i.e. ground connection, and the collector electrode of above-mentioned triode Q6 connects the HPD functional pin of HDMI by PIN19.Other connect as described in epimere.
Wherein, output low level when HPD control end HPD_CONTROL enters HDMI passage (HDMI and MHL share the HDMI passage) at the digital multimedia receiving apparatus gating, (such as AV passage, TV passage etc.) output high level while entering other passages, in order to do not carry out the detection of HDMI and MHL under other passages, inform that external equipment (HDMI equipment and MHL equipment) HDMI or MHL passage are not ready for, external equipment does not need to transmit the TMDS signal.
In the prior art, when digital multimedia receiving apparatus (as TV) is switched to other passages (as the AV passage, TV passage etc.) time, main control module is to HPD control end HDP_CONTROL output high level, the current collection that causes triode Q6 is low level very, the PIN19 pin that is the digital multimedia receiving apparatus interface is low level, even now insert HDMI equipment, PIN19 pin (the HPD signal end that now connects HDMI) is also low level, so HDMI equipment can not normally be connected with digital multimedia receiving apparatus, HDMI equipment can not send the TMDS signal, can not communicate with digital multimedia receiving apparatus, when digital multimedia receiving apparatus (as TV) is switched to the HDMI passage, HPD control end HPD_CONTROL can send low level, making triode Q6 cut-off, is HDMI equipment or MHL equipment according to the external equipment now inserted afterwards again, carries out different operations.
When being switched to the HDMI passage, and when HDMI equipment is connected to digital multimedia receiving apparatus by the HDMI wire rod, HDMI equipment by wire rod by the 5V voltage transmission to HDMI+5V pin (PIN18 pin), and because PIN2 is connected with the inside ground wire GND of HDMI equipment, while PIN2 and PIN5, the same ground connection such as PIN8, so PIN2 is low level, therefore the identification signal input ID_INPUT of MHL identification circuit is low level, the grid that is metal-oxide-semiconductor Q3 is low level, its source ground, therefore metal-oxide-semiconductor Q3 cut-off, the drain electrode of metal-oxide-semiconductor Q3 connects voltage (+5V) by resistance R 3, therefore the drain electrode of metal-oxide-semiconductor Q3 is high level, the base stage of triode Q4 is high level, its grounded emitter, therefore triode Q4 conducting, the current collection of triode Q4 low level very, triode Q5 emitter connects voltage (+5V) again, therefore triode Q5 conducting, HPD control end HPD_CONTROL output low level when digital multimedia receiving apparatus is switched to the HDMI passage again, therefore triode Q6 cut-off, make identification signal output ID_OUTPUT output high level, identification signal output ID_OUTPUT connects the PIN19 of HDMI interface, when the HDMI equipment Inspection is high level to PIN19, will export the TMDS signal to digital multimedia receiving apparatus.
When being switched to the HDMI passage, and when MHL equipment is connected to digital multimedia receiving apparatus by the MHL wire rod, as shown in Figure 3, MHL equipment arrives MHL_CD_SENSE signal end (PIN2) by wire rod by high level output, and is transferred to the main control module of digital multimedia receiving apparatus.When MHL_CD_SENSE signal end (PIN2) is high level, can start the MHL charging circuit work of digital multimedia receiving apparatus, as shown in Figure 4, thereby make power supply control chip pass through MHL_VBUS signal end (PIN18) to the MHL equipment charge; Simultaneously main control module, when PIN2 being detected and be high level, will carry out different MHL by the pull down resistor resistance of controlling main control module inside and reply, and wherein, the pull down resistor resistance is respectively 1K ohm and 100K ohm.Now, MHL_CD_SENSE signal end (as the identification signal input ID_INPUT of MHL identification circuit) is exported a high level, the grid that is metal-oxide-semiconductor Q3 is high level, its source ground, therefore metal-oxide-semiconductor Q3 conducting, the drain electrode of metal-oxide-semiconductor Q3 connects supply voltage (5V) by resistance R 3, therefore the drain electrode of metal-oxide-semiconductor Q3 is low level, the base stage of triode Q4 is low level, its grounded emitter, therefore triode Q4 cut-off, the current collection of triode Q4 high level very, triode Q5 emitter connects supply voltage (5V) again, therefore triode Q5 cut-off, again owing to when digital multimedia receiving apparatus, being switched to the HDMI passage, HPD control end HPD_CONTROL can send low level, therefore triode Q6 cut-off, the identification signal output ID_OUTPUT of MHL identification circuit puts sky, therefore MHL_CBUS signal end (PIN19) can correctly be identified the pull down resistor resistance of main control module inside under the impact without the MHL identification circuit, and send corresponding answer signal to MHL equipment, MHL equipment carries out answer signal identification after receiving answer signal, after success, MHL equipment and multimedia receiver start proper communication.
Some MHL equipment is as long as the MHL charging circuit of digital multimedia receiving apparatus starts will be charged, but some MHL equipment also needs the MHL_CBUS signal end, is that high level (being greater than 2V) makes the charge switch circuit of MHL device interior could charge when open mode (for example galaxy s2 mobile phone of Samsung).Because MHL_CBUS signal end (PIN19) is connected to the pull down resistor of digital multimedia receiving apparatus main control module, so its output is the level that voltage is relatively low (being less than 2V), therefore by part MHL recognition of devices, be low level, thereby the charge switch circuit of MHL device interior can not be started, if now digital multimedia receiving apparatus is under non-ideal case, MHL equipment and digital multimedia receiving apparatus can communicate by MHL_CBUS signal end input/output signal, thereby making the MHL_CBUS signal end is high level, MHL equipment is charged normal, if be now under ideal case, owing between MHL equipment and digital multimedia receiving apparatus, there is no communication behavior, therefore can not draw high MHL_CBUS signal end level, thereby make the charge switch circuit of MHL device interior in not opening, and then cause MHL equipment not charge.
Summary of the invention
The objective of the invention is, a kind of recognition of devices of the MHL with standby charge function circuit is provided, digital multimedia receiving apparatus also can be charged normal MHL equipment when standby.
For achieving the above object, the invention provides a kind of recognition of devices of the MHL with standby charge function circuit, be applicable in digital multimedia receiving apparatus, so that MHL equipment is detected and charges, to comprise:
The MHL recognition unit, when connecting MHL equipment, the identification signal input of described MHL recognition unit connects the MHL_CD_SENSE signal end of MHL equipment, and described identification signal input input high level, the identification signal output of described MHL recognition unit connects the MHL_CBUS signal end of MHL equipment, and described identification signal output is put sky; And
The standby output unit, the detection signal input of described standby output unit is connected to the identification signal input of described MHL recognition unit by the main control module of digital multimedia receiving apparatus, the detection signal output of described standby output unit is connected to the MHL_CBUS signal end of MHL equipment; Under the digital multimedia receiving apparatus ideal case, when the identification signal input that described MHL recognition unit detected when described main control module is high level, described main control module sends enabling signal by described standby signal input to described standby output unit, to start the work of described standby output unit, and pass through the MHL_CBUS signal end transmission high level of described standby voltage output to described MHL equipment, and then realize the MHL equipment charge.
Wherein, the main control module of described digital multimedia receiving apparatus is connected to the identification signal input of described MHL recognition unit by treating the machine testing input port, and controlled IO delivery outlet connects the standby signal input of described standby output unit by standby.
Further, described standby output unit comprises the first metal-oxide-semiconductor and the first triode, and the grid of described the first metal-oxide-semiconductor connects the signal controlling end, and drain electrode is connected to the standby charging voltage by pull-up resistor, and source electrode connects the emitter of described the first triode; The base stage of described the first triode connects described standby signal input, and emitter connects the source electrode of described the first metal-oxide-semiconductor, and, by pull down resistor ground connection, collector electrode connects described standby voltage output; When the identification signal input of described MHL recognition unit is low level, to described signal controlling end input low level; When the identification signal input of described MHL recognition unit is high level, to described signal controlling end input high level, and the enabling signal of described standby signal input is low level.
Wherein, described signal controlling end is connected to the controlled IO mouth of another standby of the main control module of described digital multimedia receiving apparatus.
Further, described standby charging voltage is preferably 3.3V.
In addition, as improvement of the technical scheme, can on existing MHL recognition unit circuit, increase the standby output unit,, described MHL recognition unit comprises the second triode, the 3rd triode, the 4th triode and the second metal-oxide-semiconductor, the grid of described the second metal-oxide-semiconductor connects described identification signal input, source ground, and drain electrode is connected to supply voltage by the 3rd resistance; The base stage of described the second triode is connected to the drain electrode of described the second metal-oxide-semiconductor by the 4th resistance, grounded emitter, and collector electrode is connected to supply voltage by the 5th, the 6th resistance of series connection; The base stage of described the 3rd triode be connected to described series connection the 5th, the tie point of the 6th resistance, emitter is connected to supply voltage, collector electrode connects the collector electrode of described the 4th triode by the 7th resistance; The base stage of described the 4th triode connects the HPD control end of described main control module by the 8th resistance, collector electrode is connected to described identification signal output, grounded emitter;
Described standby output unit comprises the first metal-oxide-semiconductor and the first triode, the grid of described the first metal-oxide-semiconductor is connected to the collector electrode of the second triode of described MHL recognition unit, drain electrode is connected to the standby charging voltage by pull-up resistor, and source electrode connects the emitter of described the first triode; The base stage of described the first triode connects described standby signal input, and emitter connects the source electrode of described the first metal-oxide-semiconductor, and, by pull down resistor ground connection, collector electrode connects described standby voltage output.
Wherein, described the first triode and the 3rd triode are the PNP triode, and described the second triode and the 4th triode are the NPN triode.
Further, described standby charging voltage is preferably 3.3V.
Further, described supply voltage is preferably 5V.
Further, described high level is for being greater than 1.5V, and described low level is for being less than 0.8V.
Above inventive embodiments, by increasing standby output unit external hardware circuit, the main control module of digital multimedia receiving apparatus detects digital multimedia receiving apparatus and whether under holding state, inserts MHL equipment, thereby determine whether to start described standby output unit, so that the MHL_CBUS signal end of high level to MHL equipment to be provided, while reaching standby to the purpose of MHL equipment charge, wherein the standby output unit can increase on original MHL recognition unit circuit, can be also increase newly with the MHL recognition unit independently.Adopt the embodiment of the present invention, can make digital multimedia receiving apparatus also can charge normal MHL equipment when standby.Due to the recognition of devices of the MHL with the standby charge function circuit by the enforcement embodiment of the present invention, can make digital multimedia receiving apparatus also can charge normal MHL equipment when standby, therefore can strengthen digital multimedia receiving apparatus to the MHL equipment recognition performance of (comprising non-standard MHL equipment), thereby improve the compatibility that digital multimedia receiving apparatus connects MHL equipment.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is HDMI and MHL interface definition figure;
Fig. 2 is that the HPD of HDMI controls schematic diagram;
Fig. 3 is the concrete connection diagram of MHL equipment and digital multimedia receiving apparatus in prior art;
Fig. 4 is the control schematic diagram of MHL equipment and digital multimedia receiving apparatus in prior art;
Fig. 5 is the block diagram of an embodiment of the recognition of devices of the MHL with standby charge function circuit provided by the invention;
Fig. 6 is the block diagram of another embodiment of the recognition of devices of the MHL with standby charge function circuit provided by the invention;
Fig. 7 is the physical circuit figure of MHL recognition unit in Fig. 6;
Fig. 8 is the physical circuit figure of standby output unit in Fig. 6;
Fig. 9 is the embodiment MHL equipment that adopts Fig. 6 to provide and the concrete connection diagram of digital multimedia receiving apparatus;
Figure 10 is the block diagram of the another embodiment of the recognition of devices of the MHL with standby charge function circuit provided by the invention;
Figure 11 is the physical circuit figure of MHL recognition unit in Figure 10;
Figure 12 is the physical circuit figure of standby output unit in Figure 10;
The concrete connection diagram of MHL equipment and digital multimedia receiving apparatus when Figure 13 is the embodiment that adopts Figure 10 to provide.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
As shown in Figure 5, the embodiment of the present invention provides a kind of recognition of devices of the MHL with standby charge function circuit, is applicable in digital multimedia receiving apparatus, so that MHL equipment is detected and charges, to comprise:
Under the digital multimedia receiving apparatus ideal case, while inserting MHL equipment, the identification signal input of described MHL recognition unit 101, be that MHL_CD_SENSE signal end (PIN2) is high level, therefore can start the MHL charging circuit work of digital multimedia receiving apparatus, thereby make power supply control chip pass through MHL_VBUS signal end (PIN18) to the MHL equipment charge; Described main control module sends enabling signal by described standby signal input to described standby output unit simultaneously, to start the work of described standby output unit, and pass through the MHL_CBUS signal end transmission high level of described standby voltage output to described MHL equipment, make the charge switch circuit of MHL device interior in open mode; Finally reach the purpose to the MHL equipment charge.
The embodiment of the present invention provides the another kind of MHL recognition of devices circuit with the standby charge function, is applicable in digital multimedia receiving apparatus so that MHL equipment is detected and charges, as shown in Figure 6, to comprise:
Further, MHL recognition unit 101 comprises triode Q4, triode Q5, triode Q6 and metal-oxide-semiconductor Q3, the grid of metal-oxide-semiconductor Q3 (as the signal input part ID_INPUT of MHL identification circuit) connects the PIN2 of HDMI interface, connect the MHL_CD_SENSE signal end of MHL by the PIN2 of HDMI interface, source ground, drain electrode is connected to supply voltage by resistance R 3; The base stage of described triode Q4 is connected to the drain electrode of described metal-oxide-semiconductor Q3 by resistance R 4, grounded emitter, and collector electrode is connected to supply voltage (5V) by resistance R 5, the R6 of series connection; The base stage of triode Q5 is connected to the resistance R 5 of series connection, the tie point of R6, and emitter is connected to supply voltage (5V), and collector electrode is by the collector electrode of resistance R 7 connecting triode Q6; The base stage of triode Q6 connects the HPD control end HPD_CONTROL of main control module by resistance R 8, collector electrode is connected to the collector electrode of described triode Q5, grounded emitter by resistance R 7; The collector electrode of triode Q6 (as the identification signal output ID_OUTPUT of MHL identification circuit) connects the MHL_CBUS signal end of MHL by the PIN19 of HDMI interface).
During the recognition of devices of the MHL with the standby charge function circuit that adopts the embodiment of the present invention to provide, as shown in Figure 9, MHL equipment is connected to the signal processing module, main control module of digital multimedia receiving apparatus by the HDMI interface of digital multimedia display device and with the MHL recognition of devices circuit of standby charge function to the concrete connection diagram of MHL equipment and digital multimedia receiving apparatus.Under the digital multimedia receiving apparatus ideal case, while inserting MHL equipment, the MHL_CD_SENSE signal end of MHL equipment can be exported high level, therefore can start the MHL charging circuit work of digital multimedia receiving apparatus, thereby make power supply control chip pass through MHL_VBUS signal end (PIN18) to the MHL equipment charge, main control module sends enabling signal by standby signal input TEST_INPUT to standby output unit 102 simultaneously, and described enabling signal is low level, to start 102 work of standby output unit, main control module is to signal controlling end POWER_ON/OFF output high level simultaneously, the grid of the first metal-oxide-semiconductor Q1 is high level, the first metal-oxide-semiconductor Q1 conducting, pass through pull-up resistor R1 and pull down resistor R2 dividing potential drop after the first metal-oxide-semiconductor Q1 conducting, the voltage that makes the source electrode (i.e. the emitter of the first triode Q2) of the first metal-oxide-semiconductor Q1 is the required high level of MHL equipment (obtaining by the resistance value of adjusting pull-up resistor R1 and pull down resistor R2), again because the main control module of the digital multimedia receiving apparatus IO delivery outlet controlled by standby understood the base stage of output low level to the first triode Q2, so now the first triode Q2 conducting and emitter are connected on standby charging voltage 3V3_STB by pull-up resistor R1, thereby make standby voltage output TEST_OUTPUT send high level to the MHL_CBUS signal end of MHL equipment, make the charge switch circuit of MHL device interior in open mode, finally reach the purpose to the MHL equipment charge.
Wherein, pull-up resistor R1 and pull down resistor R2 can carry out dividing potential drop, due to the otherness of MHL equipment, can adjust output-voltage levels by adjusting pull-up resistor R1 and pull down resistor R2, to guarantee that described digital multimedia receiving apparatus input and output IO voltage is within zone of reasonableness.
In the present embodiment, standby output unit 102 is contacted directly with MHL recognition unit 101 nothings, separate, two unit can be integrated in respectively on different circuit boards, in the situation that do not change available circuit, only to need an element circuit of increase just can reach the purpose of charging.
embodiment 3
The embodiment of the present invention provides another recognition of devices of the MHL with standby charge function circuit, is applicable in digital multimedia receiving apparatus, so that MHL equipment is detected and charges, as shown in figure 10, to comprise:
Wherein, MHL recognition unit 101 comprises the second triode Q4, the 3rd triode Q5, the 4th triode Q6 and the second metal-oxide-semiconductor Q3, as shown in figure 11, the grid of the second metal-oxide-semiconductor Q3 (as the signal input part ID_INPUT of MHL identification circuit) connects the PIN2 of HDMI interface, source ground, drain electrode is connected to supply voltage (5V) by resistance R 3; The base stage of described the second triode Q4 is connected to the drain electrode of described the second metal-oxide-semiconductor Q3 by the 4th resistance R 4, grounded emitter, and collector electrode is connected to supply voltage (5V) by the five or six resistance R 5, the R6 of series connection; The base stage of the 3rd triode Q5 is connected to the five or six resistance R 5 of series connection, the tie point of R6, and emitter is connected to supply voltage, and collector electrode connects the collector electrode of the second triode Q6 by resistance R 7; The base stage of the 4th triode Q6 connects the HPD control end HPD_CONTROL of main control module, grounded emitter by the 8th resistance R 8; The collector electrode of the 4th triode Q6 (as the identification signal output ID_OUTPUT of MHL identification circuit) connects the PIN19 of HDMI interface, and wherein the POWER_OUTPUT signal end connects the collector electrode of the second triode Q4.
Further, described the second triode Q4 and the 4th triode Q6 are the NPN triode, and described the first triode Q2 and the 3rd triode Q5 are the PNP triode.
During the recognition of devices of the MHL with the standby charge function circuit that adopts the embodiment of the present invention to provide, as shown in figure 13, MHL equipment is connected to the signal processing module, main control module of digital multimedia receiving apparatus by the HDMI interface of digital multimedia display device and with the MHL recognition of devices circuit of standby charge function to the concrete connection diagram of MHL equipment and digital multimedia receiving apparatus.Under the digital multimedia receiving apparatus ideal case, while inserting MHL equipment, the MHL_CD_SENSE signal end of MHL equipment is to the identification signal input ID_INPUT output high level of MHL recognition unit 101, therefore can start the MHL charging circuit work of digital multimedia receiving apparatus, thereby make power supply control chip pass through MHL_VBUS signal end (PIN18) to the MHL equipment charge, the grid of the second metal-oxide-semiconductor Q3 is high level simultaneously, its source ground, therefore the second metal-oxide-semiconductor Q3 conducting, the drain electrode of the second metal-oxide-semiconductor Q3 connects supply voltage (5V) by resistance R 3, therefore the drain electrode of the second metal-oxide-semiconductor Q3 is low level, the base stage of the second triode Q4 is low level, its grounded emitter, therefore the second triode Q4 cut-off, the current collection of the second triode Q4 high level very, the control signal output POWER_OUTPUT that is MHL recognition unit 101 is high level, thereby the grid (being signal controlling end POWER_ON/OFF) to the first metal-oxide-semiconductor Q1 of described standby output unit 102 sends high level, make the first metal-oxide-semiconductor Q1 conducting, pass through pull-up resistor R1 and pull down resistor R2 dividing potential drop after the first metal-oxide-semiconductor Q1 conducting, the voltage that makes the source electrode (i.e. the emitter of the first triode Q2) of the first metal-oxide-semiconductor Q1 is the required high level of MHL equipment (obtaining by the resistance value of adjusting pull-up resistor R1 and pull down resistor R2), again due to the base stage of the main control module of the digital multimedia receiving apparatus IO delivery outlet output low level controlled by standby to the first triode Q2, so now the first triode Q2 conducting and emitter are connected on standby charging voltage 3V3_STB by pull-up resistor R1, thereby make standby voltage output TEST_OUTPUT send high level to the MHL_CBUS signal end of MHL equipment, make the charge switch circuit of MHL device interior in open mode, finally reach the purpose to the MHL equipment charge.
Wherein, pull-up resistor R1 and pull down resistor R2 can carry out dividing potential drop, due to the otherness of MHL equipment, can adjust output-voltage levels by adjusting pull-up resistor R1 and pull down resistor R2, to guarantee that described digital multimedia receiving apparatus input and output IO voltage is within zone of reasonableness.
Preferably, described standby charging voltage is 3.3V.
Preferably, described supply voltage is 5V.
Preferably, described high level is for being greater than 1.5V, and described low level is for being less than 0.8V.
In the present embodiment, standby output unit 102 increases on existing MHL recognition unit 101 bases, and two unit can be integrated on same circuit board.
Above inventive embodiments, by increasing standby output unit 102 external hardware circuit, and the main control module by digital multimedia receiving apparatus detects digital multimedia receiving apparatus and whether under holding state, inserts MHL equipment, thereby determine whether to start described standby output unit 102, so that the MHL_CBUS signal end of high level to MHL equipment to be provided, while reaching the digital multimedia receiving apparatus standby to the purpose of MHL equipment charge, wherein standby output unit 102 can increase on original MHL recognition unit 101 circuit, can be also increase newly separate with MHL recognition unit 101.Adopt the embodiment of the present invention, can make digital multimedia receiving apparatus also can charge normal MHL equipment when standby.Due to the recognition of devices of the MHL with the standby charge function circuit by the enforcement embodiment of the present invention, can make digital multimedia receiving apparatus also can charge normal equipment such as MHL equipment when standby, therefore can strengthen digital multimedia receiving apparatus to the MHL equipment recognition performance of (comprising non-standard MHL equipment), thereby improve the compatibility that digital multimedia receiving apparatus connects MHL equipment.
Above disclosed is only a kind of preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the claims in the present invention, still belong to the scope that the present invention is contained.
Claims (10)
1. the recognition of devices of the MHL with a standby charge function circuit is applicable in digital multimedia receiving apparatus, so that MHL equipment is detected and charges, to comprise:
The MHL recognition unit, when connecting MHL equipment, the identification signal input of described MHL recognition unit connects the MHL_CD_SENSE signal end of MHL equipment, and described identification signal input input high level, the identification signal output of described MHL recognition unit connects the MHL_CBUS signal end of MHL equipment, and described identification signal output is put sky;
It is characterized in that, described MHL recognition of devices circuit also comprises the standby output unit, the detection signal input of described standby output unit is connected to the identification signal input of described MHL recognition unit by the main control module of digital multimedia receiving apparatus, the detection signal output of described standby output unit is connected to the MHL_CBUS signal end of MHL equipment; Under the digital multimedia receiving apparatus ideal case, when the identification signal input that described MHL recognition unit detected when described main control module is high level, described main control module sends enabling signal by described standby signal input to described standby output unit, to start the work of described standby output unit, and pass through the MHL_CBUS signal end transmission high level of described standby voltage output to described MHL equipment, and then realize the MHL equipment charge.
2. the recognition of devices of the MHL with standby charge function circuit as claimed in claim 1, it is characterized in that, the main control module of described digital multimedia receiving apparatus is connected to the identification signal input of described MHL recognition unit by treating the machine testing input port, and controlled IO delivery outlet connects the standby signal input of described standby output unit by standby.
3. the recognition of devices of the MHL with standby charge function circuit as claimed in claim 1 or 2, it is characterized in that, described standby output unit comprises the first metal-oxide-semiconductor and the first triode, the grid of described the first metal-oxide-semiconductor connects the signal controlling end, drain electrode is connected to the standby charging voltage by pull-up resistor, and source electrode connects the emitter of described the first triode; The base stage of described the first triode connects described standby signal input, and emitter connects the source electrode of described the first metal-oxide-semiconductor, and, by pull down resistor ground connection, collector electrode connects described standby voltage output; When the identification signal input of described MHL recognition unit is low level, to described signal controlling end input low level; When the identification signal input of described MHL recognition unit is high level, to described signal controlling end input high level, and the enabling signal of described standby signal input is low level.
4. the recognition of devices of the MHL with standby charge function circuit as claimed in claim 3, is characterized in that, described signal controlling end is connected to the controlled IO mouth of another standby of the main control module of described digital multimedia receiving apparatus.
5. the recognition of devices of the MHL with standby charge function circuit as claimed in claim 3, is characterized in that, described standby charging voltage is preferably 3.3V.
6. the recognition of devices of the MHL with standby charge function circuit as claimed in claim 1 or 2, is characterized in that,
Described MHL recognition unit comprises the second triode, the 3rd triode, the 4th triode and the second metal-oxide-semiconductor, and the grid of described the second metal-oxide-semiconductor connects described identification signal input, source ground, and drain electrode is connected to supply voltage by the 3rd resistance; The base stage of described the second triode is connected to the drain electrode of described the second metal-oxide-semiconductor by the 4th resistance, grounded emitter, and collector electrode is connected to supply voltage by the 5th, the 6th resistance of series connection; The base stage of described the 3rd triode be connected to described series connection the 5th, the tie point of the 6th resistance, emitter is connected to supply voltage, collector electrode connects the collector electrode of described the 4th triode by the 7th resistance; The base stage of described the 4th triode connects the HPD control end of described main control module by the 8th resistance, collector electrode is connected to described identification signal output, grounded emitter;
Described standby output unit comprises the first metal-oxide-semiconductor and the first triode, the grid of described the first metal-oxide-semiconductor is connected to the collector electrode of the second triode of described MHL recognition unit, drain electrode is connected to the standby charging voltage by pull-up resistor, and source electrode connects the emitter of described the first triode; The base stage of described the first triode connects described standby signal input, and emitter connects the source electrode of described the first metal-oxide-semiconductor, and, by pull down resistor ground connection, collector electrode connects described standby voltage output.
7. the recognition of devices of the MHL with standby charge function circuit as claimed in claim 6, is characterized in that, described the first triode and the 3rd triode are the PNP triode, and described the second triode and the 4th triode are the NPN triode.
8. the recognition of devices of the MHL with standby charge function circuit as claimed in claim 6, is characterized in that, described standby charging voltage is preferably 3.3V.
9. the recognition of devices of the MHL with standby charge function circuit as claimed in claim 6, is characterized in that, described supply voltage is preferably 5V.
10. the recognition of devices of the MHL with standby charge function circuit as claimed in claim 1, is characterized in that, described high level is for being greater than 1.5V, and described low level is for being less than 0.8V.
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| CN103491412B (en) | 2016-08-17 |
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