CN201226445Y - High-analysis multimedia interface device and control chip thereof - Google Patents
High-analysis multimedia interface device and control chip thereof Download PDFInfo
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- CN201226445Y CN201226445Y CNU2008200060661U CN200820006066U CN201226445Y CN 201226445 Y CN201226445 Y CN 201226445Y CN U2008200060661 U CNU2008200060661 U CN U2008200060661U CN 200820006066 U CN200820006066 U CN 200820006066U CN 201226445 Y CN201226445 Y CN 201226445Y
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- multimedia interface
- control
- protection circuit
- transistor
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Abstract
The utility model provides a high resolution multimedia interface device and a control chip thereof. The control chip of the high resolution multimedia interface device comprises a current leakage protection circuit and a resistive component. The current leakage protection circuit comprises a transistor. The control end of the transistor is used for receiving a control voltage; a first end is coupled with a consumption electronic control port, and a second end is coupled with the resistive component. By using the switching characteristic of the transistor, the current leakage protection circuit can protect current from leaking effectively so that the high resolution multimedia interface device conforms to the current leakage specifications as provided for in the protocol. In addition, as the current leakage protection circuit is integrated inside the control chip, the manufacturing cost is saved; the practicability of the control chip and the convenience for implementing hardware are improved.
Description
Technical field
The utility model relates to a kind of high-definition multimedia interface (HDMI) device and control chip thereof, particularly a kind of high-definition multimedia interface arrangement and control chip thereof that includes the leakage current protection circuit.
Background technology
HDMI is a kind of image/sound coffret of total digitalization, can transmit the audio ﹠ video signal that does not have compression (uncompressed) simultaneously, and all are compatible with the device of HDMI, set-top box (set-top box) for example, CD player, personal computer, holder for TV playing, digital sound and TV etc., all can be by HDMI institute standard minimize transmission differential signal (Transition-MinimizedDifferential Signaling) channel, (Consumer Electronics Control, CEC) passage is exchanged each other's needs for display data channel (Display Data Channel) and consumer electronics control.Therefore, HDMI is little by little replacing the audio-visual transmission interface of existing simulation (for example SCART and RCA terminal) on the market.
The consumer electronics control channel is to be used for transmitting audio-visual binding (AV Link) protocol signal, so that the consumer controls many HDMI devices that interlink from single remote controller, carry out as singly-bound is play (One TouchPlay), singly-bound video recording (One Touch Record), the system that reaches awaits orders functions such as (System Standby).Because the consumer electronics control channel is each the HDMI device in the direct network of having contacted, so regulation electrical specification of having the consumer electronics control port to observe strictly in the HDMI agreement, and each HDMI device all need be by to the electric current of consumer Electronic Control port and the check of magnitude of voltage, in order to avoid other electric equipment products in the network are caused damage because of excessive leakage current (Leakage Current).
In the HDMI agreement there be regulation: under the state of power-off, leakage current must not surpass 1.8 μ A, and under the state of electric power starting, the voltage level of consumer electronics control port should be maintained at 3.3V.
The utility model content
In view of this, one of the purpose of this utility model promptly is to provide a kind of leakage current protection circuit of consumer electronics control port of the HDMI of being applied to device, so that the leakage current standard of defined in the HDMI device protocol compliant.
In addition, leakage current protection circuit of the present utility model can be integrated in a HDMI control chip inside, to save production cost, improves the practicality of control chip and the convenience that hardware is implemented.
According to an embodiment of the present utility model, it provides a kind of HDMI device.This HDMI device includes consumer electronics control (CEC) port, a leakage current protection circuit and a resistance element, wherein the leakage current protection circuit includes a transistor, transistorized control end is used to receive a control voltage, first end is to be coupled to the consumer electronics control port, and first end of resistance element is used to receive a predetermined voltage level, and second end of resistance element then is coupled to transistorized second end; Wherein, when this HDMI device was power-off (power off) state, this control voltage can be closed this transistor, and when this HDMI device was electric power starting (power on) state, this control voltage can be opened this transistor.
According to another embodiment of the present utility model, it provides a kind of HDMI control chip.This HDMI control chip includes a leakage current protection circuit and a resistance element, wherein, the leakage current protection circuit includes a transistor, transistorized control end is used to receive a control voltage, first end is coupled to the consumer electronics control port, and first end of resistance element is used to receive a predetermined voltage level, and second end then is coupled to transistorized second end; Wherein, when the HDMI device was power down state, this control voltage can be closed this transistor, and when the HDMI device was power opening state, this control voltage can be opened this transistor.
Description of drawings
Fig. 1 is the schematic diagram of an embodiment of the utility model leakage current protection circuit consumer electronics control port of being applied to a HDMI device.
Fig. 2 is the schematic diagram that leakage current protection circuit shown in Figure 1, resistance and an electrostatic storage deflection (ESD) protection circuit is integrated in an embodiment of a HDMI control chip.
Fig. 3 is presented under the system power supply closing state, and how leakage current protection circuit shown in Figure 1 reaches the schematic diagram of leakage current protective benefits.
Fig. 4 is presented under the state of system power supply startup, and how leakage current protection circuit shown in Figure 1 reaches the schematic diagram of leakage current protective benefits.
The reference numeral explanation
| 110 | The consumer |
120 | |
| 130 | The |
140 | Electrostatic storage deflection (ESD) |
| 300、400 | Electronic installation |
Embodiment
In the middle of specification and follow-up claim, used some vocabulary to censure specific element.The person with usual knowledge in their respective areas should understand, and hardware manufacturer may be called same element with different nouns.This specification and follow-up claim are not used as distinguishing the mode of element with the difference of title, but the criterion that is used as distinguishing with the difference of element on function.Be an open term mentioned " comprising " in the middle of specification and the follow-up request item in the whole text, so should be construed to " comprise but be not limited to ".In addition, " coupling " speech is to comprise any indirect means that are electrically connected that directly reach at this.Therefore, be coupled to one second device, then represent this first device can directly be electrically connected in this second device, or be electrically connected to this second device indirectly by other device or connection means if describe one first device in the literary composition.
Please refer to Fig. 1, it is the schematic diagram of an embodiment of the utility model leakage current protection circuit consumer electronics control port of being applied to a HDMI device.The leakage current protection circuit possesses the function that switch is arranged, and in the present embodiment, it is to do in fact with a transistor (for example illustrated N type metal oxide semiconductor transistor) 120.The grid of transistor 120 is used to receive a control voltage Vc, and control voltage Vc is relevant (for example with the power supply of HDMI device, control voltage Vc is that the power supply from the HDMI device produces), the drain electrode of transistor 120 is coupled to a consumer electronics control port 110, and source electrode then is coupled to a resistance R; The other end of resistance R is coupled to a predetermined voltage level, and in the HDMI agreement, the resistance value of resistance R is 2.7k Ω, and predetermined voltage level is+3.3V.
Leakage current protection circuit of the present utility model and resistance R can be arranged on the outside of a HDMI control chip with the mode of additional circuit.And in another embodiment, in order to save production cost and to improve the convenience that hardware is implemented, above-mentioned transistor 120 and resistance R more can be integrated in a HDMI control chip 130 inside, and thus, the practicality of HDMI control chip 130 also can significantly improve.Please refer to Fig. 2, also can be integrated with Electrostatic Discharge protection circuit 140 in the HDMI control chip 130, in the present embodiment, electrostatic storage deflection (ESD) protection circuit 140 includes the diode of a plurality of serial connections, but it should be noted that, in order not form the path that can allow predetermined voltage level+3.3V discharge, electrostatic storage deflection (ESD) protection circuit is not arranged on the position in parallel with resistance R (diode as shown in phantom in FIG.).
Fig. 3 is presented under the state of HDMI apparatus system power-off, and how leakage current protection circuit 120 reaches the schematic diagram of leakage current protective benefits.Because the grid of transistor 120 is controlled by the control voltage Vc relevant with the power supply of HDMI device, when power-off, control voltage Vc also is positioned at low voltage level, transistor 120 is closed, therefore, form open circuit between the internal circuit of consumer electronics control port 110 and HDMI device, even this HDMI device has the electronic installation 300 of connection, consumer electronics control port 110 can not form leakage current yet.On the other hand, when system power supply started, as shown in Figure 4, control voltage Vc can be positioned at high-voltage level, makes transistor 120 conductings, and this moment, transistor 120 can be considered path.Because the HDMI device is not provided with the electrostatic storage deflection (ESD) protection circuit in parallel with resistance R, predetermined voltage level+3.3V that resistance R received does not have the path that can discharge, therefore, when this HDMI device has the electronic installation 400 of connection, voltage level on the consumer electronics control port 110 can maintain+3.3V near, meet the leakage current standard of HDMI agreement institute standard.
In the above-described embodiments, the leakage current protection circuit utilizes the switching characteristic of transistor 120 to reach the function of leakage current protection effectively, when it is applied to the consumer electronics control port of HDMI device, can make the HDMI device meet in the HDMI agreement standard about leakage current: under the state of power-off, leakage current is less than 1.8 μ A; Under the state of electric power starting, voltage level maintains 3.3V.
In addition, in above-mentioned exposure, more propose the leakage current protection circuit is integrated in the design of control chip, can save production cost, and make control chip have the advantage of high practicability and hardware enforcement convenience.
The above only is preferred embodiment of the present utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
Claims (7)
1. high-definition multimedia interface arrangement is characterized in that comprising:
One consumer electronics control port;
One leakage current protection circuit includes:
One transistor includes a control end, one first end and one second end, and wherein, this control end is used to receive a control voltage, and this first end is coupled to this consumer electronics control port; And
One resistance element includes one first end and one second end, and wherein, this of this resistance element first end is used to receive a predetermined voltage level, and this second end of this resistance element is coupled to this transistorized this second end;
Wherein, when this high-definition multimedia interface arrangement was power down state, this control voltage can be closed this transistor, and when this high-definition multimedia interface arrangement was power opening state, this control voltage can be opened this transistor.
2. high-definition multimedia interface arrangement as claimed in claim 1 is characterized in that: this transistorized this control end is coupled to a power supply of this high-definition multimedia interface arrangement.
3. high-definition multimedia interface arrangement as claimed in claim 1 is characterized in that: this leakage current protection circuit is arranged in the control chip of this high-definition multimedia interface arrangement.
4. high-definition multimedia interface arrangement as claimed in claim 1 is characterized in that: an electrostatic storage deflection (ESD) protection circuit in parallel with this resistance element is not set.
5. the control chip of a high-definition multimedia interface arrangement is characterized in that comprising:
One leakage current protection circuit includes:
One transistor includes a control end, one first end and one second end, and wherein, this control end is used to receive a control voltage, and this first end is coupled to a consumer electronics control port of this high-definition multimedia interface arrangement; And
One resistance element includes one first end and one second end, and wherein, this of this resistance element first end is used to receive a predetermined voltage level, and this second end of this resistance element is coupled to this transistorized this second end;
Wherein, when this high-definition multimedia interface arrangement was power down state, this control voltage can be closed this transistor, and when this high-definition multimedia interface arrangement was power opening state, this control voltage can be opened this transistor.
6. control chip as claimed in claim 5 is characterized in that: this transistorized this control end is coupled to a power supply of this high-definition multimedia interface arrangement.
7. control chip as claimed in claim 5 is characterized in that: an electrostatic storage deflection (ESD) protection circuit in parallel with this resistance element is not set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200060661U CN201226445Y (en) | 2008-02-05 | 2008-02-05 | High-analysis multimedia interface device and control chip thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200060661U CN201226445Y (en) | 2008-02-05 | 2008-02-05 | High-analysis multimedia interface device and control chip thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201226445Y true CN201226445Y (en) | 2009-04-22 |
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ID=40599347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200060661U Expired - Lifetime CN201226445Y (en) | 2008-02-05 | 2008-02-05 | High-analysis multimedia interface device and control chip thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201226445Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293969A (en) * | 2012-03-05 | 2013-09-11 | 联发科技股份有限公司 | Control chip |
| CN107846564A (en) * | 2016-09-18 | 2018-03-27 | 扬智科技股份有限公司 | Terminating circuit and output-stage circuit |
-
2008
- 2008-02-05 CN CNU2008200060661U patent/CN201226445Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293969A (en) * | 2012-03-05 | 2013-09-11 | 联发科技股份有限公司 | Control chip |
| CN103293969B (en) * | 2012-03-05 | 2016-01-06 | 联发科技股份有限公司 | Control chip |
| CN107846564A (en) * | 2016-09-18 | 2018-03-27 | 扬智科技股份有限公司 | Terminating circuit and output-stage circuit |
| CN107846564B (en) * | 2016-09-18 | 2020-05-22 | 扬智科技股份有限公司 | Terminal circuit and output stage circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090422 |