CN202738016U - HDMI (High Definition Multimedia Interface) OTG (On-The-Go) interface circuit - Google Patents
HDMI (High Definition Multimedia Interface) OTG (On-The-Go) interface circuit Download PDFInfo
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- CN202738016U CN202738016U CN2012203166185U CN201220316618U CN202738016U CN 202738016 U CN202738016 U CN 202738016U CN 2012203166185 U CN2012203166185 U CN 2012203166185U CN 201220316618 U CN201220316618 U CN 201220316618U CN 202738016 U CN202738016 U CN 202738016U
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/266—Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
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Abstract
The utility model relates to an HDMI (High Definition Multimedia Interface) OTG (On-The-Go) interface circuit. The HDMI OTG interface circuit comprises an HDMI OTG receiving-terminal interface circuit and an HDMI OTG sending-terminal interface circuit, wherein the HDMI OTG receiving-terminal interface circuit comprises an HDMI receiving-terminal chip, a first voltage dropping resistor R1, a current limiting circuit, a first electronic switch SW1 and a micro processing unit MCU, wherein the first voltage dropping resistor R1 is connected between a main power supply VCC and a RESERVED pin of the HDMI receiving-terminal chip in series, the current limiting circuit and the first electronic switch SW1 are connected between the main power supply VCC and a +5V pin of the HDMI receiving-terminal chip in series, and a detecting terminal ADC of the micro processing unit MCU scans the voltage of the reserved pin in a timed manner; and when the scanned voltage of the reserved pin is equal to a predetermined voltage value, a control pin of the micro processing unit MCU outputs high level and controls the first electronic switch SW1 to be switched off, and the main power supply VCC outputs a rated-current voltage to the +5V pin of the HDMI receiving-terminal chip. According to the HDMI OTG interface circuit, a power supply line or power adapter for a sending/receiving terminal is saved, so that the plug-and-play function of HDMI OTG is truly realized.
Description
Technical field
The utility model relates to a kind of follow-on HDMI interface circuit.
Background technology
The English full name of HDMI in the HDMI interface is " High Definition Multimedia ", and the meaning of Chinese is HDMI (High Definition Multimedia Interface).The HDMI interface can provide the data transfer bandwidth up to 5Gbps, can transmit audio signal and high definition video signal without compression.Need not simultaneously to transmit advance capable D/A or mould/number conversion at signal, can guarantee that the video-audio signal of first water transmits.HDMI is compatible with DVI on stitch, has just adopted different encapsulation.Compare with DVI, HDMI can the transmission of digital audio signal, and has increased the support to HDCP, and better DDC optional function is provided simultaneously.HDMI supports the data transmission rate of 5Gbps, can transmit farthest 15 meters, is enough to deal with the video of a 1080p and the audio signal of 8 sound channels.And because the video of a 1080p and the audio signal demand of 8 sound channels are less than 4GB/s, so HDMI also has very large surplus.This allows it to connect respectively DVD player with a cable, receiver and PRR.HDMI supports EDID in addition, and DDC2B can carry out " negotiation " between transmitting terminal signal source and the receiving terminal display device automatically, automatically selects only video/audio format.The benefit of using HDMI is: only needs a HDMI line, just can transmit simultaneously video-audio signal, and unlike needing now many wire rods to connect; Simultaneously, owing to need not to carry out D/A or mould/number conversion, can obtain higher Voice ﹠ Video transmission quality.For the consumer, the HDMI technology can not only provide clearly image quality, and because audio/video adopts same cable, has greatly simplified the installation of household audio and video system.
The English full name of OTG is " On-The-Go ".The OTG technology is directly to transmit the standard of file between two USB port, supports two mutually communications of USB device of this standard, and need not the main frame support, supports the product of USB-OTG can freely be defined as the different identity of master control, subordinate and dual role.Have between two products of OTG technology and can realize mutual communication and exchanges data, overcome the pattern that the available data exchange need to be undertaken by main frame, made things convenient for people to use digital product.
Although existing HDMI interface has the characteristics of " plug and play ", can automatically carry out " negotiation " between transmitting terminal and the receiving terminal, automatically select the mode of operation of only video/audio format, but it is not the HDMI OTG interface on the real meaning, because, the HDMI interface also needs separately distribution source adapter, after the external power supply, just can work between signal source and the display device.
Summary of the invention
The purpose of this utility model is to provide a kind of HDMI OTG interface circuit to society, used the HDMI interface of this interface circuit, as long as on will be between transmitting terminal and the receiving terminal connecting, transmitting terminal just can obtain power supply and works from receiving terminal, thereby realizes veritably HDMI OTG technology.
The technical solution of the utility model is: a kind of HDMI OTG interface circuit is provided, comprises the HDMI receiving terminal:
The-the first divider resistance R1, described the first divider resistance R1 is connected between the RESERVED pin of main power source VCC and HDMI receiving terminal;
-current-limiting circuit and the first electronic switch SW1, described current-limiting circuit and the first electronic switch SW1 are connected between main power source VCC and HDMI receiving terminal+5V pin;
-microprocessing unit MCU, the voltage of the described RESERVED pin of test side ADC timing scan of described microprocessing unit MCU, when the voltage that scans described RESERVED pin equals scheduled voltage, the control pin EN_VCC_HDMI output high level of described microprocessing unit MCU, control described the first electronic switch SW1 closed, then main power source VCC to described HDMI receiving terminal+voltage of a rated current of 5V pin output.
As to improvement of the present utility model, the RESERVED pin of described HDMI receiving terminal is the 14th pin for HDMI A type interface, being the 23rd pin for HDMI Type B interface, is the 17th pin for HDMI C type interface, is the 2nd pin for HDMI D type interface.
As to improvement of the present utility model, described predetermined voltage is selected between 0.7V-3.2V.
As to improvement of the present utility model, described rated current is selected between 300-1000mA.
The utility model also provides a kind of HDMI OTG interface circuit, comprises HDMI transmitting terminal and Power Management Unit,
The-the second dropping resistor R2, the end of described the second dropping resistor R2 connects other end ground connection with the RESERVED pin of HDMI transmitting terminal;
The-the second electronic switch SW2, the input of described the second electronic switch SW2 and HDMI transmitting terminal+the 5V pin joins, and the input of output and Power Management Unit joins; The control end of described the second electronic switch SW2 connects with the RESERVED pin of described HDMI transmitting terminal by divider resistance R3;
-Di three electronic switch SW3, the input of described the 3rd electronic switch SW3 and HDMI transmitting terminal main power source HDMI_POWER join, the output of described the 3rd electronic switch SW3 and HDMI transmitting terminal+the 5V pin joins, the control end of described the 3rd electronic switch SW3 connects with the RESERVED pin of described HDMI transmitting terminal through divider resistance R3, when the RESERVED of HDMI transmitting terminal pin has scheduled voltage to exist, described the 3rd electronic switch SW3 disconnects, described second switch SW2 is closed, transmitting terminal starts immediately, sends the HDMI signal to receiving terminal; Otherwise described the 3rd electronic switch SW3 is closed, and described the second electronic switch SW2 disconnects.
As to improvement of the present utility model, the RESERVED pin of described HDMI transmitting terminal is the 14th pin for HDMI A type interface, being the 23rd pin for HDMI Type B interface, is the 17th pin for HDMI C type interface, is the 2nd pin for HDMI D type interface.
As to improvement of the present utility model, described predetermined voltage is selected between 0.7V-3.2V.
The utility model also provides a kind of HDMI OTG interface circuit, comprises HDMI receiving terminal and HDMI transmitting terminal, and described HDMI receiving terminal comprises:
The-the first divider resistance R1, described the first divider resistance R1 is connected between the RESERVED pin of main power source VCC and HDMI receiving terminal;
-current-limiting circuit and the first electronic switch SW1, described current-limiting circuit and the first electronic switch SW1 are connected between main power source VCC and HDMI receiving terminal+5V pin;
-microprocessing unit MCU, the voltage of the RESERVED pin of the described HDMI receiving terminal of test side ADC timing scan of described microprocessing unit MCU, when the voltage of the RESERVED pin that scans described HDMI receiving terminal equals scheduled voltage, the control pin EN_VCC_HDMI output high level of described microprocessing unit MCU, control described the first electronic switch SW1 closed, then main power source VCC to described HDMI receiving terminal+voltage of a rated current of 5V pin output;
Described HDMI transmitting terminal comprises Power Management Unit,
The-the second divider resistance R2, the end of described the second divider resistance R2 is connected other end ground connection with the RESERVED pin of HDMI transmitting terminal;
The-the second electronic switch SW2, the input of described the second electronic switch SW2 and HDMI transmitting terminal+the 5V pin joins, and the input of output and Power Management Unit 4 joins; The control end of described the second electronic switch SW2 connects with the RESERVED pin of described HDMI transmitting terminal by current-limiting resistance R3;
-Di three electronic switch SW3, the HDMI_POWER of the input of described the 3rd electronic switch SW3 and HDMI transmitting terminal joins, the output of described the 3rd electronic switch SW3 and HDMI transmitting terminal+the 5V pin joins, the control end of described the 3rd electronic switch SW3 connects with the RESERVED pin of described transmitting terminal HDMI interface through current-limiting resistance R3, when the RESERVED pin of transmitting terminal HDMI interface has scheduled voltage to exist, described the 3rd electronic switch SW3 disconnects, described the second electronic switch SW2 is closed, transmitting terminal starts immediately, sends the HDMI signal to receiving terminal; Otherwise described the 3rd electronic switch SW3 is closed, and described the second electronic switch SW2 disconnects;
The RESERVED pin predetermined voltage that-microprocessing unit MCU detects predetermined HDMI interface end exists, and then starts the HDMI receiving terminal to the power supply of HDMI transmitting terminal, makes the normal operation under the power supply of HDMI receiving terminal of HDMI transmitting terminal.
The utility model can save supply lines or the power supply adaptor of sending out receiving end, really realizes HDMI OTG plug-and-play feature.Receiving terminal circuit of the present utility model can be used for display, HDTV, projecting apparatus etc. and shows product, makes it increase HDMI OTG function; Transmitting terminal circuit of the present utility model can be with the product with smart mobile phone, TV box, television rod and the multimedia player of HDMI output interface.Both combinations can realize that by the HDMI interface to cell-phone charging, the products such as TV box, television rod are inserted on the HDMI interface and play-over, and do not need external power supply.
Description of drawings
Fig. 1 is the circuit theory schematic diagram of a kind of embodiment of the utility model.
Embodiment
See also Fig. 1, Fig. 1 is the circuit theory schematic diagram of a kind of embodiment of the utility model.
The present embodiment, take HDMI A type as example is illustrated structure of the present utility model and principle, former structure and the principle interface circuit that is suitable for equally HDMI Type B, HDMI C type and HDMI D type in novel of this reality.
Right side among Fig. 1 is divided into HDMI OTG receiving terminal interface circuit, and left part is HDMI OTG transmitting terminal interface circuit.The below is described below:
A kind of HDMI OTG receiving terminal interface circuit comprises HDMI receiving terminal 1,
The-the first divider resistance R1, described the first divider resistance R1 is connected between the RESERVED pin of main power source VCC+5 and HDMI receiving terminal 1;
-current-limiting circuit 2 and the first electronic switch SW1, described current-limiting circuit 2 and the first electronic switch SW1 are connected between main power source VCC and HDMI receiving terminal 1+5V pin, the input of described the first electronic switch SW1 through after the current-limiting circuit 2 with main power source VCC+5, the output of described the first electronic switch SW1 and HDMI receiving terminal+the 5V pin joins, and consists of a current limliting output circuit;
-microprocessing unit MCU, the voltage of the RESERVED pin of the described HDMI receiving terminal 1 of test side ADC timing scan of described microprocessing unit MCU, when the voltage of the RESERVED pin that scans described HDMI receiving terminal 1 equals scheduled voltage, in the present embodiment, scheduled voltage is 2.5V, certainly, described predetermined voltage can be selected between 0.7V-3.2V; The control pin EN_VCC_HDMI output high level of described microprocessing unit MCU, control described the first electronic switch SW1 closed, then main power source VCC to described HDMI receiving terminal+voltage of a rated current of 5V pin output, the voltage of exporting in the present embodiment is+5V, rated current is 500mA, certainly, described rated current can be selected between 300-1000mA.
In the utility model, the RESERVED pin of described HDMI receiving terminal is the 14th pin for HDMI A type interface, is the 23rd pin for HDMI Type B interface, is the 17th pin for HDMI C type interface, is the 2nd pin for HDMI D type interface.
A kind of HDMI OTG transmitting terminal interface circuit of the present utility model comprises HDMI transmitting terminal 3 and Power Management Unit 4,
The-the second dropping resistor R2, the end of described the second dropping resistor R2 connects other end ground connection with the RESERVED pin of HDMI transmitting terminal 3;
The-the second electronic switch SW2, the input of described the second electronic switch SW2 and HDMI transmitting terminal 3+the 5V pin joins, and the input of output and Power Management Unit 4 joins; The control end of described the second electronic switch SW2 connects with the RESERVED pin of described HDMI transmitting terminal 3 by divider resistance R3;
-Di three electronic switch SW3, the input of described the 3rd electronic switch SW3 and HDMI transmitting terminal main power source HDMI_POWER join, the output of described the 3rd electronic switch SW3 and HDMI transmitting terminal 3+the 5V pin joins, the control end of described the 3rd electronic switch SW3 connects with the RESERVED pin of described HDMI transmitting terminal 3 through divider resistance R3, when the RESERVED of HDMI transmitting terminal 3 pin has scheduled voltage to exist, in the present embodiment, scheduled voltage is 2.5V, certainly, described predetermined voltage can be selected between 0.7V-3.2V; Described the 3rd electronic switch SW3 disconnects, and described second switch SW2 is closed, and transmitting terminal starts immediately, sends the HDMI signal to receiving terminal; Otherwise described the 3rd electronic switch SW3 is closed, and described second switch SW2 disconnects.
In the utility model, the RESERVED pin of described HDMI transmitting terminal is the 14th pin for HDMI A type interface, is the 23rd pin for HDMI Type B interface, is the 17th pin for HDMI C type interface, is the 2nd pin for HDMI D type interface.
This practicality newly also provides a kind of HDMI OTG interface circuit, comprises HDMI receiving terminal 1 and HDMI transmitting terminal 3, and described HDMI receiving terminal 1 comprises:
The-the first divider resistance R1, described the first divider resistance R1 is connected between the RESERVED pin of main power source VCC and HDMI receiving terminal;
-current-limiting circuit 2 and the first electronic switch SW1, described current-limiting circuit 2 and the first electronic switch SW1 are connected between main power source VCC and HDMI receiving terminal+5V pin;
-microprocessing unit MCU, the voltage of the RESERVED pin of the described HDMI receiving terminal of test side ADC timing scan of described microprocessing unit MCU, when the voltage of the RESERVED pin that scans described HDMI receiving terminal equals scheduled voltage, the control pin EN_VCC_HDMI output high level of described microprocessing unit MCU, control described the first electronic switch SW1 closed, then main power source VCC to described HDMI receiving terminal+voltage of a rated current of 5V pin output;
Described HDMI transmitting terminal 3 comprises Power Management Unit 4,
The-the second divider resistance R2, the end of described the second divider resistance R2 is connected other end ground connection with the RESERVED pin of HDMI transmitting terminal;
The-the second electronic switch SW2, the input of described the second electronic switch SW2 and HDMI transmitting terminal+the 5V pin joins, and the input of output and Power Management Unit 4 joins; The control end of described the second electronic switch SW2 connects with the RESERVED pin of described HDMI transmitting terminal by current-limiting resistance R3;
-Di three electronic switch SW3, the HDMI_POWER of the input of described the 3rd electronic switch SW3 and HDMI transmitting terminal joins, the output of described the 3rd electronic switch SW3 and HDMI transmitting terminal+the 5V pin joins, the control end of described the 3rd electronic switch SW3 connects with the RESERVED pin of described transmitting terminal HDMI interface through current-limiting resistance R3, when the RESERVED pin of transmitting terminal HDMI interface has scheduled voltage to exist, described the 3rd electronic switch SW3 disconnects, described the second electronic switch SW2 is closed, transmitting terminal starts immediately, sends the HDMI signal to receiving terminal 1; Otherwise described the 3rd electronic switch SW3 is closed, and described the second electronic switch SW2 disconnects;
The RESERVED pin predetermined voltage that microprocessing unit MCU detects predetermined HDMI interface end 1 exists, predetermined voltage can be selected between 0.7V-3.2V, then start HDMI receiving terminal 1 to the power supply of HDMI transmitting terminal 3, make HDMI transmitting terminal 3 normal operation under 1 power supply of HDMI receiving terminal.
The utility model has solved following four problems altogether in order to realize HDMI OTG function:
1, solves the HDMI receiving terminal to the problem of HDMI transmitting terminal power supply.Namely meet the first electronic switch SW1 between the 18PIN of right side among the figure at the main power source+5V of HDMI receiving terminal and the main power source of HDMI receiving terminal 1+5V POWER pin.When recognizing transmitting terminal and be not HDMI OTG equipment, SW1 disconnects, and main power source+5V POWER pin only provides plug detecting level to transmitting terminal; When recognizing transmitting terminal and be HDMI OTG equipment, SW1 connects, and transmitting terminal is provided the power supply of 5V 500mA by the 18th pin.For prevent+main power source of the receiving terminal that 5V POWER pin shorted to earth causes is unusual, the current-limiting circuit of a 500mA of string between main power source and SW1, described current-limiting circuit can be a current-limiting resistance.
2, solve the HDMI transmitting terminal from the HDMI receiving terminal+5V POWER pin 18PIN obtains the problem of power supply.Transmitting terminal interface 2+5V pin and HDMI receiving terminal+meet the second electronic switch SW2 between 5V POWER pin the 18th pin.When recognizing transmitting terminal and be not HDMI OTG equipment, the second electronic switch SW2 disconnects; When recognizing receiving terminal and be HDMI OTG equipment, the second electronic switch SW2 connects, and obtains the power supply of 5V 500mA by 18PIN.
3, solve HDMI OTG recognition of devices problem, at the 14th pin, C type interface is identified HDMI OTG equipment by miniature processing unit MCU at the 17th pin at the RESERVED of HDMI receiving terminal pin A type interface.At the HDMI receiving terminal, the RESERVED pin of HDMI receiving terminal 1 connects that resistance is 1k in first divider resistance the present embodiment, can surely arrive main power source VCC+5V according to need, connecing the second dropping resistor R2 resistance at the RESERVED of HDMI transmitting terminal 3 pin is 1k, can select as required, the second dropping resistor R2 also arrives ground GND, and when HDMI receiving terminal 1 was connected connection with the HDMI transmitting terminal, predetermined voltage was 2.5V.When the microprocessing unit MCU of receiving terminal detects predetermined voltage when being 2.5V, microprocessing unit MCU looks it and has detected HDMI OTG equipment, and closed the first electronic switch SW1 of microprocessing unit MCU provides the 5V power supply to the HDMI transmitting terminal; At the HDMI transmitting terminal, when the RESERVED of HDMI transmitting terminal 3 pin has 2.5V voltage to exist, the 3rd electronic switch SW3 disconnects, the second electronic switch SW2 is closed, the electric current of the main power source VCC+5V of HDMI receiving terminal is delivered to the Power Management Unit 4 of HDMI transmitting terminal by the first electronic cutting SW1 and the second electronic switch SW2, the HDMI transmitting terminal starts immediately, sends the HDMI signal to the HDMI receiving terminal.
4, the problem of solution and existing HDMI circuit compatibility.When predetermined voltage was not 2.5V, the 3rd electronic switch SW3 was closed, and the first electronic switch SW1 and the second electronic switch SW2 disconnect, and existing HDMI circuit will work.
Claims (2)
1. a HDMI OTG interface circuit comprises HDMI receiving terminal (1), it is characterized in that, comprising:
The-the first divider resistance (R1), described the first divider resistance (R1) are connected between the RESERVED pin of main power source (VCC) and HDMI receiving terminal;
-current-limiting circuit (2) and the first electronic switch (SW1), described current-limiting circuit (2) and the first electronic switch (SW1) are connected between main power source (VCC) and HDMI receiving terminal+5V pin;
-microprocessing unit (MCU), the voltage of the RESERVED pin of the described HDMI receiving terminal of test side (ADC) timing scan of described microprocessing unit (MCU), when the voltage of the RESERVED pin that scans described HDMI receiving terminal equals scheduled voltage, control pin (EN_VCC_HDMI) the output high level of described microprocessing unit (MCU), control described the first electronic switch (SW1) closure, then main power source (VCC) to described HDMI receiving terminal+voltage of a rated current of 5V pin output.
2. HDMI OTG interface circuit according to claim 1, it is characterized in that: the RESERVED pin of described HDMI receiving terminal is the 14th pin for HDMI A type interface, the 23rd, 24 pin for HDMI Type B interface, being the 17th pin for HDMI C type interface, is the 2nd pin for HDMI D type interface.
3, HDMI OTG interface circuit according to claim 1 and 2 is characterized in that: the voltage of the RESERVED pin of described predetermined HDMI interface, between 0.7V-3.2V, select.
4, HDMI OTG interface circuit according to claim 1 and 2, it is characterized in that: described rated current is selected between 300-1000mA.
5, a kind of HDMI OTG interface circuit comprises HDMI transmitting terminal (3) and Power Management Unit (4), it is characterized in that, also comprises:
The-the second divider resistance (R2), an end of described the second divider resistance (R2) is connected other end ground connection with the RESERVED pin of HDMI transmitting terminal interface;
The-the second electronic switch (SW2), the input of described the second electronic switch (SW2) and HDMI transmitting terminal interface+the 5V pin joins, and the input of output and Power Management Unit (4) joins; The control end of described the second electronic switch (SW2) connects with the RESERVED pin of described HDMI transmitting terminal interface by current-limiting resistance (R3);
-Di three electronic switches (SW3), the input of described the 3rd electronic switch (SW3) and (HDMI_POWER) of HDMI transmitting terminal join, the output of described the 3rd electronic switch (SW3) and HDMI transmitting terminal interface+the 5V pin joins, the control end of described the 3rd electronic switch (SW3) connects with the RESERVED pin of described transmitting terminal HDMI interface through current-limiting resistance (R3), when the RESERVED pin of transmitting terminal HDMI interface has scheduled voltage to exist, described the 3rd electronic switch (SW3) disconnects, described the second electronic switch (SW2) closure, transmitting terminal starts immediately, sends the HDMI signal to receiving terminal (1); Otherwise, described the 3rd electronic switch (SW3) closure, described the second electronic switch (SW2) disconnects.
6, HDMI OTG interface circuit according to claim 5, it is characterized in that: the RESERVED pin of described HDMI transmitting terminal interface is the 14th pin for HDMI A type interface, for HDMI Type B interface, it is the 23rd pin, being the 17th pin for HDMI C type interface, is the 2nd pin for HDMI D type interface.
7, a kind of HDMI OTG interface circuit comprises HDMI receiving terminal (1) and HDMI transmitting terminal (3), and described HDMI receiving terminal (1) comprising:
The-the first divider resistance (R1), described the first divider resistance (R1) are connected between the RESERVED pin of main power source (VCC) and HDMI receiving terminal;
-current-limiting circuit (2) and the first electronic switch (SW1), described current-limiting circuit (2) and the first electronic switch (SW1) are connected between main power source (VCC) and HDMI receiving terminal+5V pin;
-microprocessing unit (MCU), the voltage of the RESERVED pin of the described HDMI receiving terminal of test side (ADC) timing scan of described microprocessing unit (MCU), when the voltage of the RESERVED pin that scans described HDMI receiving terminal equals scheduled voltage, control pin (EN_VCC_HDMI) the output high level of described microprocessing unit (MCU), control described the first electronic switch (SW1) closure, then main power source (VCC) to described HDMI receiving terminal+voltage of a rated current of 5V pin output;
Described HDMI transmitting terminal (3) comprises Power Management Unit (4),
The-the second divider resistance (R2), an end of described the second divider resistance (R2) is connected other end ground connection with the RESERVED pin of HDMI transmitting terminal interface;
The-the second electronic switch (SW2), the input of described the second electronic switch (SW2) and HDMI transmitting terminal interface+the 5V pin joins, and the input of output and Power Management Unit (4) joins; The control end of described the second electronic switch (SW2) connects with the RESERVED pin of described HDMI transmitting terminal interface by current-limiting resistance (R3);
-Di three electronic switches (SW3), the input of described the 3rd electronic switch (SW3) and the HDMI_POWER of HDMI transmitting terminal join, the output of described the 3rd electronic switch (SW3) and HDMI transmitting terminal interface+the 5V pin joins, the control end of described the 3rd electronic switch (SW3) connects with the RESERVED pin of described transmitting terminal HDMI interface through current-limiting resistance (R3), when the RESERVED pin of transmitting terminal HDMI interface has scheduled voltage to exist, described the 3rd electronic switch (SW3) disconnects, described the second electronic switch (SW2) closure, transmitting terminal starts immediately, sends the HDMI signal to receiving terminal (1); Otherwise, described the 3rd electronic switch (SW3) closure, described the second electronic switch (SW2) disconnects;
The RESERVED pin predetermined voltage that-microprocessing unit (MCU) detects predetermined HDMI interface end (1) exists, then start HDMI receiving terminal (1) to the power supply of HDMI transmitting terminal (3), make HDMI transmitting terminal (3) normal operation under HDMI receiving terminal (1) power supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012203166185U CN202738016U (en) | 2012-07-03 | 2012-07-03 | HDMI (High Definition Multimedia Interface) OTG (On-The-Go) interface circuit |
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| CN2012203166185U CN202738016U (en) | 2012-07-03 | 2012-07-03 | HDMI (High Definition Multimedia Interface) OTG (On-The-Go) interface circuit |
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| WO2016000269A1 (en) * | 2014-07-04 | 2016-01-07 | 鸿富锦精密工业（深圳）有限公司 | Display system, display device and tv stick |
| CN105554428A (en) * | 2016-01-29 | 2016-05-04 | 龙迅半导体（合肥）股份有限公司 | HDMI signal sending device and receiving device and power supply system based on HDMI interface |
| CN106463097A (en) * | 2014-06-19 | 2017-02-22 | 谷歌公司 | Method for producing a printed circuit board with an embedded sensor chip, and printed circuit board |
| WO2019062519A1 (en) * | 2017-09-27 | 2019-04-04 | 京东方科技集团股份有限公司 | Interface device and display device |
| CN114020675A (en) * | 2021-10-29 | 2022-02-08 | 北京小米移动软件有限公司 | Power supply method and device, electronic equipment and storage medium |
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2012
- 2012-07-03 CN CN2012203166185U patent/CN202738016U/en not_active Expired - Fee Related
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| CN106463097A (en) * | 2014-06-19 | 2017-02-22 | 谷歌公司 | Method for producing a printed circuit board with an embedded sensor chip, and printed circuit board |
| US10310578B2 (en) | 2014-06-19 | 2019-06-04 | Google Llc | Systems, methods, and media for providing power to an HDMI source |
| US11340675B2 (en) | 2014-06-19 | 2022-05-24 | Google Llc | Systems, methods, and media for providing power to an HDMI source |
| WO2016000269A1 (en) * | 2014-07-04 | 2016-01-07 | 鸿富锦精密工业（深圳）有限公司 | Display system, display device and tv stick |
| US20170111609A1 (en) * | 2014-07-04 | 2017-04-20 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd | Display system, display device, and hdmi dongle |
| JP2017526229A (en) * | 2014-07-04 | 2017-09-07 | 鴻富錦精密工業（深▲セン▼）有限公司 | Display system, display device and television stick |
| US9774820B2 (en) * | 2014-07-04 | 2017-09-26 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. | Display system, display device, and HDMI dongle |
| EP3166320A4 (en) * | 2014-07-04 | 2017-12-20 | Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd. | Display system, display device and tv stick |
| CN105554428A (en) * | 2016-01-29 | 2016-05-04 | 龙迅半导体（合肥）股份有限公司 | HDMI signal sending device and receiving device and power supply system based on HDMI interface |
| WO2019062519A1 (en) * | 2017-09-27 | 2019-04-04 | 京东方科技集团股份有限公司 | Interface device and display device |
| CN114020675A (en) * | 2021-10-29 | 2022-02-08 | 北京小米移动软件有限公司 | Power supply method and device, electronic equipment and storage medium |
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