CN204906555U - Reduced form MHL control circuit - Google Patents
Reduced form MHL control circuit Download PDFInfo
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- CN204906555U CN204906555U CN201520266801.2U CN201520266801U CN204906555U CN 204906555 U CN204906555 U CN 204906555U CN 201520266801 U CN201520266801 U CN 201520266801U CN 204906555 U CN204906555 U CN 204906555U
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Abstract
The utility model discloses a reduced form MHL control circuit. Among the reduced form MHL control circuit the control signal of power control IC's EN foot is MHL_Detect, and MHL_Detect and master control IC are connected, signal line among the MHLHDMI signal switching module only contains HDMI_HOTPLUG signal line and CBUSHDMI_HPD signal line, and the HDMI_HOTPLUG signal line is connected with HDMI stand 19Pin, and the CBUSHDMI_HPD signal line is connected with master control IC, MHL equipment insert discernment among the circuit module second resistance be 300K resistance. Reduced form MHL control circuit practices thrift half the IO mouth and uses, practices thrift control hotplug signal line and draws high circuit and MHL power supply output circuit etc. Have with low costs, the advantage of dependable performance.
Description
Technical field
The utility model belongs to technical field of electronic products, is specifically related to a kind of reduced form MHL control circuit.
Background technology
As everyone knows, the coffret of existing HD video data comprises HDMI and MHL interface, but the circuit of these two kinds of interfaces and pin are not identical.Existing HDMI pin schematic diagram as shown in Figure 6, there are 19 pins, wherein 12 pins are mainly used for the signal of transmission of video and audio frequency, and these 12 pins are divided into 4 passages and come transmission of audio and video, and we are referred to as transition minimized differential signaling (TMDS) it; Also have 3 pins to be used for specially doing controlling use, these control signals comprise DDC (DisplayDataChannel) and consumer electronics controls (ConsumerElectronicsControl, CEC).So other pin does other use, so only audio frequency, video and control have just accounted for 15 pins.
MHL is by SONY, NOKIA, Explore, SiliconImage, Toshiba, and three magnitude companies combine a novel portable product video transmission agreement of proposal.MHL is different from 19 pins of traditional HDMI, and MHL only has 5 pins, and wherein 2 pins are used for transmission of audio and vision signal specially, and other 2 is VDD-to-VSS, also has 1 pin to be used for specially controlling.It equals TMDS and DDC, CEC to combine to control, it is a control bus, had this control bus just all Voice & Videos can be carried out omnibearing control, it makes the storage of data and the transmission of data become to be more prone to, the benefit of MHL interface that Here it is.Support that the transmitting terminal of MHL function can send signal to by means of USB interface and support that the HDMI of MHL function display end receives.Although MHL output equipment only connects with 5 lines, need to provide more I/O to identify control for display end, to sentence end equipment be HDMI equipment or MHL equipment and make corresponding response.
Tradition realizes the I/O interface that MHL function has used four master control IC, is that MHL_SENSE, CBUS/HDMI_HPD, VBUS_EN and HDMI_MHL_SEL equisignal line controls respectively.Tradition MHL control circuit is divided into two modules: HDMI_MHL commutation circuit module (HDMI_MHLswitchcircuit) and MHL equipment insert identification circuit module (MHLcablesenseCircuit).
HDMI_MHL commutation circuit module comprises again two circuit modules, is respectively power management module and MHL/HDMI signal switching module.
Power management module comprises preset power and Energy control IC; The 18Pin that the output HDMI_5V of Energy control IC connects HDMI stand powers pin, is connected with the VBUS interface of MHL output interface; The described input of Energy control IC is connected with the positive output end of preset power; The EN control signal of Energy control IC is that VBUS_EN, VBUS_EN are connected with master control IC.
MHL/HDMI signal switching module comprises the first triode, the second triode, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance and the 12 resistance; Described first triode is PNP triode, and its emitter connects the output of Energy control IC, and base stage is connected with the collector electrode of the second triode by the 8th resistance, and collector electrode is by the 7th resistance access HDMI_HOTPLUG holding wire; Described second triode is NPN triode, and its collector electrode is connected with the output of Energy control IC with the 12 resistance by the 9th resistance successively, grounded emitter, and base stage is connected with HDMI_MHL_SEL holding wire by the tenth resistance; One end access the tenth resistance of the 11 resistance and HDMI_MHL_SEL holding wire tie point, other end access the 9th resistance of the 11 resistance and the tie point of the 12 resistance; HDMI_HOTPLUG holding wire is connected with CBUS/HDMI_HPD holding wire by the 6th resistance again; Wherein, HDMI_MHL_SEL holding wire is connected with master control IC, and HDMI_HOTPLUG and HDMI stand 19Pin connects, and CBUS/HDMI_HPD is connected with master control IC.
MHL equipment inserts identification circuit module and comprises the first resistance and the second resistance, and one end of described first resistance connects MHL_Detect holding wire, and MHL_Detect holding wire is connected with the 2Pin of HDMI stand; The described first resistance other end connects MHL_SENSE holding wire, and MHL_SENSE holding wire is connected with master control IC; The link of the first resistance and MHL_Detect holding wire is accessed in one end of described second resistance, the other end ground connection of described second resistance.
The control principle of above-mentioned traditional MHL control circuit is: first, when MHL wire rod facility inserts the HDMI of display terminal, because the 2Pin of HDMI and 15Pin interface tandem 3.3k resistance link together by MHL wire rod in design, the 2Pin of HDMI stand can be high level by the 5V level pull-up of 15Pin, high level by MHLDetect holding wire pass to master control IC master control IC is identified this equipment is MHL equipment.Master control IC control VBUS_EN holding wire after receiving MHL equipment access exports high level and drives VBUS_EN to go control Energy control IC to power to MHL transmitting apparatus, and control HDMI_MHL_SEL holding wire drives two-stage transistor control circuit to be cut-off state, Hotpulg holding wire is not driven high, because Hotplug holding wire is do not need high level state when being identified as MHL equipment, when identifying HDMI equipment, Hotplug holding wire needs to draw high to be identified as HDMI equipment.After above step completes, MHL transmitting apparatus and display begin through the EDID data etc. that Hotplug holding wire realizes Handshake Protocol and reading displayed device.
Obviously, MHL control circuit of the prior art needs 4 the I/O mouths taking master control IC, and needs to design a large amount of circuit and go to realize controlling and recognition function.
Utility model content
In order to overcome the shortcoming of prior art with not enough, the use simplifying MHL control circuit and reduce the I/O mouth of master control IC, the purpose of this utility model is to provide a kind of reduced form MHL control circuit.
The purpose of this utility model is achieved through the following technical solutions:
A kind of reduced form MHL control circuit, comprises HDMI_MHL commutation circuit module and MHL equipment inserts identification circuit module, and HDMI_MHL commutation circuit module comprises power management module and MHL/HDMI signal switching module; Power management module comprises preset power and Energy control IC; MHL equipment inserts identification circuit module and comprises the first resistance and the second resistance, and one end of described first resistance connects MHL_Detect holding wire, and MHL_Detect holding wire is connected with the 2Pin of HDMI stand; The described first resistance other end connects MHL_SENSE holding wire, and MHL_SENSE holding wire is connected with master control IC; The link of the first resistance and MHL_Detect holding wire is accessed in one end of described second resistance, the other end ground connection of described second resistance;
Wherein, the control signal of the EN pin of described Energy control IC is that MHL_Detect, MHL_Detect are connected with master control IC; Holding wire in MHL/HDMI signal switching module only comprises HDMI_HOTPLUG holding wire and CBUS/HDMI_HPD holding wire, and HDMI_HOTPLUG holding wire is connected with HDMI stand 19Pin, and CBUS/HDMI_HPD holding wire is connected with master control IC; It is 300K resistance that described MHL equipment inserts the second resistance in identification circuit module.
The control principle of reduced form MHL control circuit described in the utility model is:
First, when MHL wire rod facility inserts the HDMI of display terminal, because the 2Pin of HDMI and 15Pin interface tandem 3.3k resistance link together by MHL wire rod in design, the 2Pin of HDMI stand can be high level by the 5V level pull-up of 15Pin, high level by MHLDetect holding wire pass to master control IC master control IC is identified this equipment is MHL equipment.
Then by improvement of the present utility model, second resistance is set to 300K resistance, one end of second resistance is connected with MHL_Detect holding wire, other end ground connection, and MHL_Detect holding wire is connected with the 2Pin of HDMI stand, therefore the resistance to earth of the 2Pin of HDMI stand is 300K, makes the high level of 2Pin be greater than 4 volts.And allow MHL_Detect holding wire control the EN pin of Energy control IC, control Energy control IC output voltage to MHL transmitting apparatus, saved the I/O mouth of master control IC.
For the pull-up circuit of HDMI_HOTPLUG holding wire, the utility model eliminates HDMI_MHL_SEL holding wire and peripheral control circuits in above-mentioned traditional MHL control circuit and draws high the circuit design of HDMI_HOTPLUG holding wire, but have the I/O mouth of 5V pull-up to connect CBUS/HDMI_HPD holding wire with one, control module is identified by outside, recognizing as when MHL equipment inserts, I/O mouth does not make pull-up, when being identified as HDMI equipment, I/O mouth is pulled upward to 5V.
Preferably, at EN pin and the 3rd resistance of connecting between MHL_Detect holding wire of Energy control IC; Described 3rd resistance can limit the electric current of the EN pin of Energy control IC.
Preferably, between the EN pin and MHL_Detect holding wire of Energy control IC, access the 4th resistance, the other end of the 4th resistance connects over the ground; Access the 4th resistance and can ensure that the EN pin of the Energy control IC when not having MHL wire rod to access is low level, prevent misoperation.
Preferably, described power management module also comprises the first electric capacity, the second electric capacity and the 3rd electric capacity, and the positive pole of described first electric capacity is connected with the output of Energy control IC, minus earth; Described second Capacitance parallel connection is at the first electric capacity two ends; The positive pole of described 3rd electric capacity is connected with the positive output end of described preset power, minus earth; Described first electric capacity, the second electric capacity and the 3rd electric capacity act as filtering voltage regulation, the stability of power supply can be ensured.
Preferably, described MHL/HDMI signal switching module also comprises the 5th resistance, and described 5th resistant series is between the connecting line of CBUS/HDMI_HPD and HDMI_HOTPLUG; Described 5th resistance can limit the electric current of HDMI_HOTPLUG holding wire, equally also can limit the I/O mouth that immediate current damages master control IC.
Preferably, MHL equipment inserts in identification circuit module and also comprises the 4th electric capacity, and described 4th Capacitance parallel connection is at the second resistance two ends; Described 4th electric capacity can filtering second resistance thermal coupling interference make circuit stability, prevent misoperation.
The utility model has following advantage and effect relative to prior art: reduced form MHL control circuit described in the utility model adopts the simplest circuit to realize the commutation circuit of MHL function control circuit and MHL/HDMI function, finally reach the I/O mouth use of saving half than traditional design scheme, save control Hotplug holding wire and draw high circuit, save control MHL power output circuit etc., there is cost low, the advantage of dependable performance.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the HDMI_MHL commutation circuit module of traditional MHL control circuit.
Fig. 2 is the electrical block diagram of the MHL equipment insertion identification circuit module of traditional MHL control circuit.
Fig. 3 is the electrical block diagram of the power management module of reduced form MHL control circuit described in the utility model.
Fig. 4 is the electrical block diagram of the MHL/HDMI signal switching module of reduced form MHL control circuit described in the utility model.
Fig. 5 is the electrical block diagram of the MHL equipment insertion identification circuit module of reduced form MHL control circuit described in the utility model.
Fig. 6 is existing HDMI pin schematic diagram.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Shown in the electrical block diagram composition graphs 1 of tradition MHL control circuit and Fig. 2.
Tradition MHL control circuit is divided into two modules: HDMI_MHL commutation circuit module (HDMI_MHLswitchcircuit) (as shown in Figure 1) and MHL equipment insert identification circuit module (MHLcablesensecircuit) (as shown in Figure 2).
HDMI_MHL commutation circuit module comprises again two circuit modules, is respectively power management module (marking this module region in Fig. 1 is A1) and MHL/HDMI signal switching module (marking this module region in Fig. 1 is A2).
Power management module comprises preset power VCC_5V and Energy control IC (U1); The 18Pin that the output HDMI_5V of Energy control IC connects HDMI stand powers pin, is connected with the VBUS interface of MHL output interface; The input of described Energy control IC is connected with the positive output end of preset power VCC_5V; The EN control signal of Energy control IC is that VBUS_EN, VBUS_EN are connected with master control IC.
MHL/HDMI signal switching module comprises the first triode Q1, the second triode Q2, the 6th resistance R11, the 7th resistance R12, the 8th resistance R13, the 9th resistance R14, the tenth resistance R15, the 11 resistance R16 and the 12 resistance R17; Described first triode Q1 is PNP triode, and its emitter connects the output of Energy control IC, and base stage is connected with the collector electrode of the second triode Q2 by the 8th resistance R13, and collector electrode accesses HDMI_HOTPLUG holding wire by the 7th resistance R12; Described second triode Q2 is NPN triode, and its collector electrode is connected with the output of Energy control IC with the 12 resistance R17 by the 9th resistance R14 successively, grounded emitter, and base stage is connected with HDMI_MHL_SEL holding wire by the tenth resistance R15; One end access the tenth resistance R15 of the 11 resistance R16 and HDMI_MHL_SEL holding wire tie point, the tie point of other end access the 9th resistance R14 and the 12 resistance R17 of the 11 resistance R16; HDMI_HOTPLUG holding wire is connected with CBUS/HDMI_HPD holding wire by the 6th resistance R11 again; Wherein, HDMI_MHL_SEL holding wire is connected with master control IC, and HDMI_HOTPLUG and HDMI stand 19Pin connects, and CBUS/HDMI_HPD is connected with master control IC.
MHL equipment inserts identification circuit module and comprises the first resistance R22 and the second resistance R21, one end of described first resistance R22 connects MHL_Detect holding wire, MHL_Detect holding wire is connected with the 2Pin of HDMI stand, the described first resistance R22 other end connects MHL_SENSE holding wire, and MHL_SENSE holding wire is connected with master control IC; The link of the first resistance R22 and MHL_Detect holding wire is accessed in one end of described second resistance R21, the other end ground connection of described second resistance R21.
The control principle of tradition MHL control circuit is: first, when MHL wire rod facility inserts the HDMI of display terminal, because the 2Pin of HDMI and 15Pin interface tandem 3.3k resistance link together by MHL wire rod in design, the 2Pin of HDMI stand can be high level by the 5V level pull-up of 15Pin, high level by MHLDetect holding wire pass to master control IC master control IC is identified this equipment is MHL equipment.Master control IC control VBUS_EN holding wire after receiving MHL equipment access exports high level and drives VBUS_EN to go control Energy control IC to power to MHL transmitting apparatus, and control HDMI_MHL_SEL holding wire drives two-stage transistor control circuit to be cut-off state, Hotpulg holding wire is not driven high, because Hotplug holding wire is do not need high level state when being identified as MHL equipment, when identifying HDMI equipment, Hotplug holding wire needs to draw high to be identified as HDMI equipment.After above step completes, MHL transmitting apparatus and display begin through the EDID data etc. that Hotplug holding wire realizes Handshake Protocol and reading displayed device.
Reduced form MHL control circuit described in the utility model, improves traditional MHL control circuit, shown in electrical block diagram composition graphs 3 to Fig. 5.
Described reduced form MHL control circuit comprises HDMI_MHL commutation circuit module (shown in composition graphs 3 and Fig. 4) and MHL equipment inserts identification circuit module (as shown in Figure 5), and HDMI_MHL commutation circuit module comprises power management module (as shown in Figure 3) and MHL/HDMI signal switching module (as shown in Figure 4);
Power management module comprises preset power VCC_5V and Energy control IC; The 18Pin that the output HDMI_5V of Energy control IC connects HDMI stand powers pin, is connected with the VBUS interface of MHL output interface; The input of described Energy control IC is connected with the positive output end of preset power VCC_5V.
MHL equipment inserts identification circuit module and comprises the first resistance R22 and the second resistance R21, and one end of described first resistance R22 connects MHL_Detect holding wire, and MHL_Detect holding wire is connected with the 2Pin of HDMI stand; The described first resistance R22 other end connects MHL_SENSE holding wire, and MHL_SENSE holding wire is connected with master control IC; The link of the first resistance and MHL_Detect holding wire is accessed in one end of described second resistance R21, the other end ground connection of described second resistance R21;
Wherein the difference of reduced form MHL control circuit described in the utility model specific embodiment and traditional MHL control circuit is: the control signal of the EN pin of described Energy control IC is that MHL_Detect, MHL_Detect are connected with master control IC; Holding wire in MHL/HDMI signal switching module only comprises HDMI_HOTPLUG holding wire and CBUS/HDMI_HPD holding wire, and HDMI_HOTPLUG holding wire is connected with HDMI stand 19Pin, and CBUS/HDMI_HPD holding wire is connected with master control IC; It is 300K resistance that described MHL equipment inserts the second resistance R21 in identification circuit module.
The control principle of reduced form MHL control circuit described in the utility model is:
First, when MHL wire rod facility inserts the HDMI of display terminal, because the 2Pin of HDMI and 15Pin interface tandem 3.3k resistance link together by MHL wire rod in design, the 2Pin of HDMI stand can be high level by the 5V level pull-up of 15Pin, high level by MHLDetect holding wire pass to master control IC master control IC is identified this equipment is MHL equipment.
Then by improvement of the present utility model, second resistance is set to 300K resistance, one end of second resistance R21 is connected with MHL_Detect holding wire, other end ground connection, and MHL_Detect holding wire is connected with the 2Pin of HDMI stand, therefore the resistance to earth of the 2Pin of HDMI stand is 300K, makes the high level of 2Pin be greater than 4 volts.And allow MHL_Detect holding wire control the EN pin of Energy control IC, control Energy control IC output voltage to MHL transmitting apparatus, saved the I/O mouth of master control IC.
For the pull-up circuit of HDMI_HOTPLUG holding wire, the utility model eliminates HDMI_MHL_SEL holding wire and peripheral control circuits in above-mentioned traditional MHL control circuit and draws high the circuit design of HDMI_HOTPLUG holding wire, but have the I/O mouth of 5V pull-up to connect CBUS/HDMI_HPD holding wire with one, control module is identified by outside, recognizing as when MHL equipment inserts, I/O mouth does not make pull-up, when being identified as HDMI equipment, I/O mouth is pulled upward to 5V.
Described outside identify control module, be the functional module of routine, adopt simple software control, when recognize insert for MHL equipment time, not by I/O mouth pull-up; When being identified as HDMI equipment, I/O mouth is pulled upward to 5V by control circuit.
At EN pin and the 3rd resistance R19 that connects between MHL_Detect holding wire of Energy control IC; Described 3rd resistance R19 can limit the electric current of the EN pin of Energy control IC.
Between the EN pin and MHL_Detect holding wire of Energy control IC, access the 4th resistance R18, the other end of the 4th resistance R18 connects over the ground; Access the 4th resistance R18 and can ensure that the EN pin of the Energy control IC when not having MHL wire rod to access is low level, prevent misoperation.
Described power management module also comprises the first electric capacity C11, the second electric capacity C12 and the 3rd electric capacity C13, and the positive pole of described first electric capacity C11 is connected with the output of Energy control IC, minus earth; Described second electric capacity C12 is connected in parallel on the first electric capacity C11 two ends; The positive pole of described 3rd electric capacity C13 is connected with the positive output end of described preset power VCC_5V, minus earth; Described first electric capacity C11, the second electric capacity C12 and the 3rd electric capacity C13 act as filtering voltage regulation, can ensure the stability of power supply.
Described MHL/HDMI signal switching module also comprises the 5th resistance R10, and described 5th resistance R10 is connected between the connecting line of CBUS/HDMI_HPD and HDMI_HOTPLUG; Described 5th resistance R10 can limit the electric current of HDMI_HOTPLUG holding wire, equally also can limit the I/O mouth that immediate current damages master control IC.
MHL equipment inserts in identification circuit module and also comprises the 4th electric capacity C21, and described 4th electric capacity C21 is connected in parallel on the second resistance R21 two ends; Described 4th electric capacity C21 can filtering second resistance R21 thermal coupling interference make circuit stability, prevent misoperation.
Above-described embodiment is the utility model preferably execution mode; but execution mode of the present utility model is not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection range of the present utility model.
Claims (6)
1. a reduced form MHL control circuit, comprises HDMI_MHL commutation circuit module and MHL equipment inserts identification circuit module, and HDMI_MHL commutation circuit module comprises power management module and MHL/HDMI signal switching module; Power management module comprises preset power and Energy control IC; MHL equipment inserts identification circuit module and comprises the first resistance and the second resistance, and one end of described first resistance connects MHL_Detect holding wire, and MHL_Detect holding wire is connected with the 2Pin of HDMI stand; The described first resistance other end connects MHL_SENSE holding wire, and MHL_SENSE holding wire is connected with master control IC; The link of the first resistance and MHL_Detect holding wire is accessed in one end of described second resistance, the other end ground connection of described second resistance; It is characterized in that: the control signal of the EN pin of described Energy control IC is that MHL_Detect, MHL_Detect are connected with master control IC; Holding wire in MHL/HDMI signal switching module only comprises HDMI_HOTPLUG holding wire and CBUS/HDMI_HPD holding wire, and HDMI_HOTPLUG holding wire is connected with HDMI stand 19Pin, and CBUS/HDMI_HPD holding wire is connected with master control IC; It is 300K resistance that described MHL equipment inserts the second resistance in identification circuit module.
2. a kind of reduced form MHL control circuit according to claim 1, is characterized in that: at EN pin and the 3rd resistance of connecting between MHL_Detect holding wire of Energy control IC.
3. a kind of reduced form MHL control circuit according to claim 1, is characterized in that: between the EN pin and MHL_Detect holding wire of Energy control IC, access the 4th resistance, the other end of the 4th resistance connects over the ground.
4. a kind of reduced form MHL control circuit according to claim 1, is characterized in that: described power management module also comprises the first electric capacity, the second electric capacity and the 3rd electric capacity, and the positive pole of described first electric capacity is connected with the output of Energy control IC, minus earth; Described second Capacitance parallel connection is at the first electric capacity two ends; The positive pole of described 3rd electric capacity is connected with the positive output end of described preset power, minus earth.
5. a kind of reduced form MHL control circuit according to claim 1, it is characterized in that: described MHL/HDMI signal switching module also comprises the 5th resistance, described 5th resistant series is between the connecting line of CBUS/HDMI_HPD and HDMI_HOTPLUG.
6. a kind of reduced form MHL control circuit according to claim 1, is characterized in that: MHL equipment inserts in identification circuit module and also comprises the 4th electric capacity, and described 4th Capacitance parallel connection is at the second resistance two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520266801.2U CN204906555U (en) | 2015-04-28 | 2015-04-28 | Reduced form MHL control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520266801.2U CN204906555U (en) | 2015-04-28 | 2015-04-28 | Reduced form MHL control circuit |
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| CN204906555U true CN204906555U (en) | 2015-12-23 |
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| CN201520266801.2U Expired - Fee Related CN204906555U (en) | 2015-04-28 | 2015-04-28 | Reduced form MHL control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105681716A (en) * | 2015-12-29 | 2016-06-15 | 龙迅半导体（合肥）股份有限公司 | Communication channel physical layer circuit of MHL (Mobile High-Definition Link) device |
-
2015
- 2015-04-28 CN CN201520266801.2U patent/CN204906555U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105681716A (en) * | 2015-12-29 | 2016-06-15 | 龙迅半导体（合肥）股份有限公司 | Communication channel physical layer circuit of MHL (Mobile High-Definition Link) device |
| CN105681716B (en) * | 2015-12-29 | 2018-11-06 | 龙迅半导体（合肥）股份有限公司 | A kind of communication channel physical layer circuit of MHL equipment |
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