CN208863013U - A kind of HDMI input hot plug detection circuit - Google Patents
A kind of HDMI input hot plug detection circuit Download PDFInfo
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- CN208863013U CN208863013U CN201821834798.XU CN201821834798U CN208863013U CN 208863013 U CN208863013 U CN 208863013U CN 201821834798 U CN201821834798 U CN 201821834798U CN 208863013 U CN208863013 U CN 208863013U
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- hdmi
- hot plug
- secondary switch
- switch circuit
- plug detection
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Abstract
The utility model relates to HDMI transmission technique fields, and particularly a kind of HDMI inputs hot plug detection circuit.The utility model discloses a kind of HDMI to input hot plug detection circuit, secondary switch circuit, HDMI socket and processor including the receiving end HDMI is arranged in, the secondary switch circuit is made of transistor, the input terminal of the secondary switch circuit is connect with the 5V power pins of HDMI socket, the output end of the secondary switch circuit is connect with the hot plug of HDMI socket detection pin, and the control terminal of the secondary switch circuit and the control output end of processor connect.The utility model improves the reliability of HDMI input hot plug detection, and the user experience is improved, and circuit structure is simple, and component is few, it is easy to accomplish, it is at low cost.
Description
Technical field
The utility model belongs to HDMI transmission technique field, inputs hot plug detection circuit more particularly to a kind of HDMI.
Background technique
HD video HDMI IN socket allows to receive the high-definition video signal from external equipment, and supports hot plug.
When as receiving, HDMI IN socket supports the synchronous booting and hot plug detection with external equipment.Currently, most of video
There are asynchronous switch on condition with peripheral hardware by HDMI IN, it is possible to which, there are asynchronous electrifying condition, common detection circuit is hot plug
It detects pin and 5V is pulled upward to by pull-up resistor, it is unripe to will lead to E-EDID built in HDMI IN video reception IC in this way
In the case of, transmitting terminal initiates read operation, to cause to read failure and can not export display signal, reduces user experience.
To solve the above problems, some increases E-EDID EEROM chip using in receiving end, when connecing for HDMI transmitting terminal
Mouth is with the socket of receiving end when being connected, the E-EDID that the 5V power pins of transmitting terminal will provide 5V voltage and be added to receiving end
EEROM chip, while being drawn high the hot plug that end occurs detection pin by resistance, transmitting terminal detects that hot plug detects pin
The E-EDID information of E-EDID EEROM chip is read after drawing high, and by the channel TMDS output display signal, although solving
The above problem, but need to increase E-EDID EEROM chip and burned corresponding EDID information, structure is complicated, at high cost.
Summary of the invention
The purpose of this utility model is to provide a kind of HDMI input hot plug detection circuit is above-mentioned to solve
Technical problem.
To achieve the above object, the technical solution adopted in the utility model are as follows: a kind of HDMI input hot plug detection circuit,
Secondary switch circuit, HDMI socket and processor including the receiving end HDMI is arranged in, the secondary switch circuit is by transistor
Constitute, the input terminal of the secondary switch circuit connect with the 5V power pins of HDMI socket, the secondary switch circuit it is defeated
Outlet is connect with the hot plug of HDMI socket detection pin, and the control terminal of the secondary switch circuit and the control of processor export
End connection.
Further, the secondary switch circuit is made of triode and metal-oxide-semiconductor.
Further, the secondary switch circuit includes NPN triode Q1 and PMOS tube MQ1, the NPN triode Q1
Collector series resistance R3 meet the 5V power pins of HDMI socket, the emitter ground connection of the NPN triode Q1, the NPN
The base series resistor R1 of triode Q1 connects the control output end of processor, and the source electrode of the PMOS tube MQ1 connects HDMI socket
5V power pins, the drain electrode of the PMOS tube MQ1 connect the hot plug detection pin of HDMI socket, the grid of the PMOS tube MQ1
Series resistance R4 connects the collector of NPN triode Q1.
Further, the secondary switch circuit further includes resistance R2, and the resistance R2 connects the base in NPN triode Q1
Between pole and ground.
Further, the secondary switch circuit further includes capacitor C1, the capacitor C1 connect source electrode in PMOS tube MQ1 with
Between grid.
Further, the secondary switch circuit further includes resistance R5, and the resistance R5 is serially connected in the drain electrode of PMOS tube MQ1
Between the hot plug detection pin of HDMI socket.
Further, the 5V power pins of the HDMI socket also pass through capacitor C486 and are grounded.
The advantageous effects of the utility model:
The utility model improves the reliability of HDMI input hot plug detection, and the user experience is improved, and circuit structure
Simply, it is not necessarily to external EEROM chip, component is few, it is easy to accomplish, it is at low cost.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model specific embodiment.
Specific embodiment
Now in conjunction with the drawings and specific embodiments, the present invention will be further described.
As shown in Figure 1, a kind of HDMI (High Definition Multimedia Interface, the more matchmakers of fine definition
Body interface) input hot plug detection circuit, secondary switch circuit, HDMI socket JP1 and place including the receiving end HDMI is arranged in
Device is managed, in this specific embodiment, processor can realize that this is those skilled in the art using existing HDMI reception chip
It can realize, no longer describe in detail easily.
The secondary switch circuit is made of transistor, and the input terminal of the secondary switch circuit is with HDMI socket JP1's
The HDMIIN_5V connection of 5V power pins, thus when HDMI transmitting terminal is plugged on HDMI socket JP1, with HDMI transmitting terminal
The hot plug of the connection of 5V power pins, the output end and HDMI socket JP1 of the secondary switch circuit detects pin HDMIIN_
HPD connection, to connect when HDMI transmitting terminal is plugged on HDMI socket JP1 with the hot plug detection pin of HDMI transmitting terminal
It connects, the control terminal of the secondary switch circuit and the control output end HDMIIN_HPDO connection of processor.
In this specific embodiment, the secondary switch circuit is made of triode and metal-oxide-semiconductor, specifically, the second level is opened
Powered-down road includes NPN triode Q1 and PMOS tube MQ1, and the collector series resistance R3 of the NPN triode Q1 connects HDMI socket
The 5V power pins HDMIIN_5V of JP1, the emitter ground connection of the NPN triode Q1, the base stage string of the NPN triode Q1
Connection resistance R1 meets the control output end HDMIIN_HPDO of processor, and the base stage of the NPN triode Q1 also series resistance R2 connects
Ground, the source electrode of the PMOS tube MQ1 connect the 5V power pins HDMIIN_5V of HDMI socket JP1, the drain electrode of the PMOS tube MQ1
Series resistance R5 connects the hot plug detection pin HDMIIN_HPD of HDMI socket JP1, the gate series resistance of the PMOS tube MQ1
R4 connects the collector of NPN triode Q1.It further include capacitor C1, the capacitor C1 connects between the source electrode and grid of PMOS tube MQ1.
Certainly, in other embodiments, secondary switch circuit is also possible to existing other second levels consisting of transistors
Switching circuit.
In this specific embodiment, the 5V power pins HDMIIN_5V of the HDMI socket JP1 also passes through capacitor C486 and connects
Ground is filtered.
The course of work:
1. under the power down condition of receiving end, when HDMI transmitting terminal is plugged on HDMI socket JP1 and is attached, the control of processor
Output end HDMIIN_HPDO is low level without electricity, and NPN triode Q1 is not turned on, the Vgs=0V of PMOS tube MQ1, PMOS tube MQ1
It is not turned on, at this point, hot plug detection pin HDMIIN_HPD is dragged down by the resistance of transmitting terminal, transmitting terminal is detected without hot plug and is believed
Number.
2. the control output end HDMIIN_HPDO of receiving end start process, processor remains low level, NPN triode
Q1 is not turned on, and the Vgs=0V of PMOS tube MQ1, PMOS tube MQ1 is not turned on, at this point, hot plug detection pin HDMIIN_HPD is sent out
The resistance of sending end drags down, and detects signal without hot plug to transmitting terminal.
3. receiving end has been switched on, processor is completed after receiving circuit part initial configuration to HDMIIN input video,
Control output end HDMIIN_HPDO exports high level, NPN triode Q1 conducting, PMOS tube MQ1 conducting, hot plug detection pin
HDMIIN_HPD is raised as 5V, and the hot plug detection pin of transmitting terminal becomes high level at this time, and transmitting terminal initiates normal detection
Process.
The utility model improves the reliability of HDMI input hot plug detection, and the user experience is improved, and circuit structure
Simply, it is not necessarily to external EEROM chip, component is few, it is easy to accomplish, it is at low cost.
Although specifically showing and describing the utility model in conjunction with preferred embodiment, those skilled in the art is answered
This is understood, in the spirit and scope for not departing from the utility model defined by the appended claims, in form and details
On the utility model can be made a variety of changes, be the protection scope of the utility model.
Claims (7)
1. a kind of HDMI inputs hot plug detection circuit, it is characterised in that: the secondary switch electricity including the receiving end HDMI is arranged in
Road, HDMI socket and processor, the secondary switch circuit are made of transistor, the input terminal of the secondary switch circuit with
The 5V power pins of HDMI socket connect, and the output end of the secondary switch circuit and the hot plug detection pin of HDMI socket connect
It connects, the control terminal of the secondary switch circuit and the control output end of processor connect.
2. HDMI according to claim 1 inputs hot plug detection circuit, it is characterised in that: the secondary switch circuit by
Triode and metal-oxide-semiconductor are constituted.
3. HDMI according to claim 2 inputs hot plug detection circuit, it is characterised in that: the secondary switch circuit packet
NPN triode Q1 and PMOS tube MQ1 are included, the collector series resistance R3 of the NPN triode Q1 connects the 5V power supply of HDMI socket
Pin, the emitter ground connection of the NPN triode Q1, the base series resistor R1 of the NPN triode Q1 connect the control of processor
Output end processed, the source electrode of the PMOS tube MQ1 connect the 5V power pins of HDMI socket, and the drain electrode of the PMOS tube MQ1 meets HDMI
The hot plug of socket detects pin, and the gate series resistance R4 of the PMOS tube MQ1 connects the collector of NPN triode Q1.
4. HDMI according to claim 3 inputs hot plug detection circuit, it is characterised in that: the secondary switch circuit is also
Including resistance R2, the resistance R2 is connect between the base stage and ground of NPN triode Q1.
5. HDMI according to claim 3 inputs hot plug detection circuit, it is characterised in that: the secondary switch circuit is also
Including capacitor C1, the capacitor C1 is connect between the source electrode and grid of PMOS tube MQ1.
6. HDMI according to claim 3 inputs hot plug detection circuit, it is characterised in that: the secondary switch circuit is also
Including resistance R5, the resistance R5 is serially connected between the drain electrode of PMOS tube MQ1 and the hot plug detection pin of HDMI socket.
7. HDMI according to claim 1 inputs hot plug detection circuit, it is characterised in that: the 5V electricity of the HDMI socket
Source pin also passes through capacitor C486 and is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821834798.XU CN208863013U (en) | 2018-11-08 | 2018-11-08 | A kind of HDMI input hot plug detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821834798.XU CN208863013U (en) | 2018-11-08 | 2018-11-08 | A kind of HDMI input hot plug detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208863013U true CN208863013U (en) | 2019-05-14 |
Family
ID=66422047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821834798.XU Active CN208863013U (en) | 2018-11-08 | 2018-11-08 | A kind of HDMI input hot plug detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208863013U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253017A (en) * | 2021-04-16 | 2021-08-13 | 广州朗国电子科技有限公司 | Electrical performance test module of HDMI port |
-
2018
- 2018-11-08 CN CN201821834798.XU patent/CN208863013U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253017A (en) * | 2021-04-16 | 2021-08-13 | 广州朗国电子科技有限公司 | Electrical performance test module of HDMI port |
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