CN111404562A - Method for electrostatic discharge protection of a receiver, and receiver - Google Patents

Method for electrostatic discharge protection of a receiver, and receiver Download PDF

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Publication number
CN111404562A
CN111404562A CN201910005699.3A CN201910005699A CN111404562A CN 111404562 A CN111404562 A CN 111404562A CN 201910005699 A CN201910005699 A CN 201910005699A CN 111404562 A CN111404562 A CN 111404562A
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CN
China
Prior art keywords
receiver
terminal
detection
reference voltage
detection result
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Pending
Application number
CN201910005699.3A
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Chinese (zh)
Inventor
罗国元
颜守德
陈彦钧
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Realtek Semiconductor Corp
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Realtek Semiconductor Corp
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Priority to CN201910005699.3A priority Critical patent/CN111404562A/en
Publication of CN111404562A publication Critical patent/CN111404562A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)

Abstract

The invention provides a method for electrostatic discharge protection of a receiver and a related receiver. The receiver may include a reference voltage terminal, a detection terminal, at least one set of receiving terminals, and at least one set of termination resistors. The method may comprise: generating a detection result according to the voltage level of the detection terminal; and controlling whether to couple the at least one set of termination resistors between the at least one set of receiving terminals and the reference voltage terminal, respectively, according to the detection result.

Description

Method for electrostatic discharge protection of a receiver, and receiver
Technical Field
The present invention relates to electrostatic discharge protection, and more particularly, to a method for electrostatic discharge protection of a receiver and a related receiver.
Background
With the use of various home multimedia devices such as set-top boxes (set-top boxes) and multimedia players and amplifiers, video data can be input through a High-Definition multimedia interface (HDMI). Since the user may frequently plug/unplug the hdmi cable, the chance of damaging the hdmi cable due to electrostatic discharge (ESD) is greatly increased.
Electrostatic discharge is one of the major factors causing damage to most electronic devices or systems. For example, at the moment a cable is inserted into the hdmi port, static electricity accumulated on the cable may instantaneously discharge to the hdmi port to cause damage to its internal circuitry, and in particular, such damage is usually permanent damage, which often affects the overall circuit function. In order to avoid the above problems, the related art usually utilizes an additional esd protection circuit to improve the tolerance to esd. However, the related art method not only adds extra cost, but also generally limits the tolerance to electrostatic discharge to the specification of the protection device itself. Therefore, a novel method and related architecture are needed to improve the tolerance to electrostatic discharge.
Disclosure of Invention
An objective of the present invention is to provide a method for esd protection of a receiver and a related receiver, so as to improve the tolerance of the receiver to esd.
At least one embodiment of the present invention provides a method for electrostatic discharge protection of a receiver, wherein the receiver may include a reference voltage terminal, a detection terminal, at least one set of receiving terminals, and at least one set of termination resistors, and the method comprises: generating a detection result according to the voltage level of the detection terminal; and controlling whether to couple the at least one set of termination resistors between the at least one set of receiving terminals and the reference voltage terminal, respectively, according to the detection result.
At least one embodiment of the present invention provides a receiver, wherein the receiver may include a reference voltage terminal, a detection circuit, at least one set of receiving terminals, at least one set of termination resistors, and at least one set of switching circuits. The reference voltage terminal may be used to supply power to the receiver, and the at least one set of receive terminals may be used to receive data. The detection circuit is coupled to a detection terminal of the receiver, wherein the detection circuit is used for generating a detection result according to a voltage level of the detection terminal. The at least one switching circuit is coupled to the at least one set of termination resistors, wherein the at least one switching circuit is capable of controlling whether to couple the at least one set of termination resistors between the at least one set of receiving terminals and the reference voltage terminal respectively according to the detection result.
The method and the related device such as the receiver can judge whether the receiver is connected with a transmitter through a cable according to a detection result obtained by detecting the voltage level of the detection terminal so as to control whether the at least one group of termination resistors are respectively coupled between the at least one group of receiving terminals and the reference voltage terminal, thereby avoiding the damage of the receiver caused by electrostatic discharge under the condition that the receiver is not connected.
Drawings
Fig. 1 is a diagram of a receiver according to an embodiment of the invention.
Fig. 2 is an example of the receiver not yet connected to a transmitter via a cable according to an embodiment of the present invention.
Fig. 3 is an example of the receiver having completed a connection with the transmitter via the cable according to an embodiment of the present invention.
FIG. 4 is a flowchart illustrating an ESD protection method according to an embodiment of the present invention.
Description of the symbols
10 HDMI receiver
20 HDMI transmitter
50 cable
100 detection circuit
110_1, 110_2 and 110_3 circuit units
200 differential signal generator
AVCCReference voltage terminal
RT1、RT2Resistance (RC)
SW1、SW2Switching circuit
TC,TX、TC,RX、TD,TX、TD,RXTerminal with a terminal body
T1,RX、T2,RXReceiving terminal
T1,TX、T2,TXTransmission terminal
410. 420, 430, 440
Detailed Description
FIG. 1 is a block diagram of a receiver such as an HDMI interface according to an embodiment of the present inventionSchematic diagram of a sink (abbreviated HDMI sink) 10. As shown in FIG. 1, the HDMI receiver 10 may include a reference voltage terminal AVCC A detection circuit 100, at least one group of receiving terminals such as receiving terminal T1,RXAnd T2,RXAt least one set of termination resistors such as resistor RT1And RT2And at least one set of switching circuits such as a switching circuit SW1And SW2. Receiving terminal T1,RXAnd T2,RXMay include at least one Transition Minimized Differential Signaling (TMDS) channel for receiving data (e.g., video and audio data), and a reference voltage terminal AVCCMay be used to supply power to one or more circuit units, such as the circuit units 110_1, 110_2, and 110_3, inside the HDMI receiver 10, wherein the circuit units 110_1, 110_2, and 110_3 may be regarded as related processing circuits for receiving data (e.g., video and audio data). In the present embodiment, the detection circuit 100 can be coupled to a detection terminal of the HDMI receiver 10, such as the terminal TD,RX(e.g., a 5V power receiving terminal) and a confirmation terminal such as terminal TC,RX(e.g., a hot plug detect (hot plug detect) terminal), and terminal TC,RXMay be further coupled to the at least one set of switching circuits such as the switching circuit SW1And SW2Wherein the detection circuit 100 can be based on the terminal TD,RXGenerates a detection result and passes through the terminal TC,RXAnd transmitting or outputting the detection result. For example, the detection terminal such as terminal TD,RXCan be regarded as a detection voltage, which may vary between voltage levels V1 and V2, such as: v1 ═ 0V and V2 ═ 5V, but the present invention is not limited thereto. In addition, the at least one group of switching circuits can control whether to switch the resistor R or not according to the detection resultT1And RT2Are respectively coupled to the receiving terminals T1,RXAnd T2,RXAnd a reference voltage terminal AVCCIn the meantime. For example, the switch circuit SW1Can be coupled to a resistor RT1And a receiving terminal T1,RXAnd a switch circuit SW2Can be coupled to a resistor RT2And a receiving terminal T2,RXWherein the switch circuit SW1And SW2Whether to conduct or not can be controlled according to the detection result; also for example, a switch circuit SW1Can be coupled to a resistor RT1And a reference voltage terminal AVCCAnd a switch circuit SW2Can be coupled to a resistor RT2And a reference voltage terminal AVCCWherein the switch circuit SW1And SW2Whether to turn on or not may be controlled according to the detection result, but the invention is not limited thereto. Controlling whether to use the resistor R according to the detection resultT1And RT2Are respectively coupled to the receiving terminals T1,RXAnd T2,RXAnd a reference voltage terminal AVCCAll embodiments in between are intended to be within the scope of the present invention.
Fig. 2 shows an example of the HDMI receiver 10 not yet connected to a transmitter such as an HDMI transmitter (abbreviated as HDMI transmitter) 20 via a cable 50 according to an embodiment of the present invention. The HDMI transmitter 20 may include at least one differential signal generator, such as the differential signal generator 200, for generating a differential output signal according to the differential image data. In the present embodiment, since the HDMI receiver 10 is not yet connected to the HDMI transmitter 20 through a cable 50, the terminal T of the HDMI transmitter 20 is connected to the HDMI receiverD,TXA voltage level (e.g., 5V) at (e.g., a 5V power transmission terminal) is not able to connect the terminal T of the HDMI receiver 10 via the cable 50D,RXIs pulled up to a certain level (e.g., 5V), and thus, the terminal TD,RXMay be below the particular level or may not be stably maintained at the particular level. At this time, the detection circuit 100 is at the terminal TC,RXA first detection result is generated to indicate that the connection is not completed (e.g., a logic low signal), wherein the first detection result may be used as an example of the detection result. Based on the first detection result, the HDMI receiver 10 can control the switch circuit SW1And SW2(e.g., by keeping switch circuit SW off using detection circuit 1001And SW2) Make the switch circuit SW1And SW2In its non-conducting state, the static electricity accumulated in the cable 50 will not contact the receiving terminal T1,RXAnd/orT2,RXThe circuit units 110_1, 110_2, and 110_3 are damaged due to the transient discharge. In addition, since this connection is not yet completed, the terminal T of the HDMI transmitter 20C,TXA signal corresponding to the connection not being completed (e.g., the logic low signal) may be received through the cable 50 (e.g., a hot plug detect terminal), or a signal corresponding to the connection being completed (e.g., a logic high signal) may not be received, and the HDMI transmitter 20 (such as the differential signal generator 200 thereof) may not start transmitting the video data.
Fig. 3 shows an example of the HDMI receiver 10 connected to the HDMI transmitter 20 via the cable 50 according to an embodiment of the present invention. In the present embodiment, since the HDMI receiver 10 has completed the connection with the HDMI transmitter 20 through the cable 50, the terminal T of the HDMI transmitter 20 is madeD,TXThe voltage level (e.g., 5V) of the HDMI receiver 10 can be connected to the terminal T of the HDMI receiver 10 via the cable 50D,RXIs pulled up to the specific level (e.g., 5V), and thus, the terminal TD,RXCan be stably maintained at the specific level. At this time, the detection circuit 100 is at the terminal TC,RXA second detection result is generated to indicate that the connection is complete (e.g., the logic high signal), wherein the second detection result may be used as another example of the detection result. Based on the second detection result, the HDMI receiver 10 can control the switch circuit SW1And SW2(e.g., by turning on the switch circuit SW using the detection circuit 1001And SW2) Make the switch circuit SW1And SW2Is switched to its on-state, i.e. when the resistor R is presentT1And RT2Can be respectively coupled with the receiving terminals T1,RXAnd T2,RXAnd a reference voltage terminal AVCCIn the meantime. In addition, since this connection is completed, the terminal T of the HDMI transmitter 20C,TXA signal corresponding to the connection completion (e.g., the logic high signal) can be received through the cable 50, and the HDMI transmitter 20 (such as the differential signal generator 200 therein) can transmit the signal through the transmission terminal T1,TXAnd T2,TXAnd starting to transmit the video and audio data.
FIG. 4 is a flowchart illustrating an ESD protection method according to an embodiment of the present invention.
In step 410, the detection circuit 100 may be based on a detection terminal (e.g., terminal T)D,RX) Generates a detection result (such as the detection result described above, e.g., the first detection result or the second detection result).
In step 420, when the detection result indicates the detection terminal (e.g., terminal T)D,RX) Is below a certain level (such as the certain level described above, e.g., 5V), step 430 is entered; otherwise, step 440 is entered.
In step 430, the switch circuit SW1And SW2Can avoid the use of resistor RT1And RT2Are respectively coupled to the receiving terminals T1,RXAnd T2,RXAnd a reference voltage terminal AVCCIn-between, e.g. switching circuits SW1And SW2Will not be turned on.
In step 440, the switch circuit SW1And SW2Can change the resistance RT1And RT2Are respectively coupled to the receiving terminals T1,RXAnd T2,RXAnd a reference voltage terminal AVCCIn-between, e.g. switching circuits SW1And SW2Can be turned on.
In addition, for simplicity, the above embodiments only use one set of receiving terminals (such as receiving terminal T)1,RXAnd T2,RX) A set of termination resistors (such as resistor R)T1And RT2) And a set of switching circuits (such as a switching circuit SW)1And SW2) This is for illustration purposes, but the invention is not limited thereto. For example, the HDMI receiver 10 may include a plurality of sets of receiving terminals and corresponding terminal resistors and switching circuits, and the method of the present invention can be analogized to each set of receiving terminals and corresponding terminal resistors and switching circuits in the HDMI receiver 10.
To sum up, the method and related apparatus (e.g., the HDMI receiver 10) of the present invention can avoid the vulnerable circuit units such as the circuit units 110_1, 110_2, and 110_3 inside the HDMI receiver 10 from being damaged under the condition of no side effect or less possibility of side effectIs damaged by electrostatic discharge. For example, when the cable 50 contacts the receiving terminal T1,RXAnd/or T2,RXDue to the terminal TD,RXHas not been pulled to the specific level, so that the switch circuit SW1And SW2Without being turned on, the static electricity accumulated on the cable 50 is discharged through other paths with relatively high electrostatic discharge tolerance without entering the HDMI receiver 10 through the termination resistor to cause damage to the circuit units 110_1, 110_2, and 110_ 3.
The above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made by the claims of the present invention should be covered by the scope of the present invention.

Claims (10)

1. A method for electrostatic discharge protection of a receiver, wherein the receiver comprises a reference voltage terminal, a detection terminal, at least one set of receiving terminals, and at least one set of termination resistors, the method comprising:
generating a detection result according to the voltage level of the detection terminal; and
controlling whether to couple the at least one set of termination resistors between the at least one set of receiving terminals and the reference voltage terminal, respectively, according to the detection result.
2. The method of claim 1, wherein the voltage level of the detection terminal is lower than a certain level when the receiver has not completed connection with a transmitter through a cable, and the step of controlling whether to couple the at least one set of termination resistors between the at least one set of reception terminals and the reference voltage terminal, respectively, comprises:
when the detection result indicates that the voltage level of the detection terminal is lower than the specific level, the at least one set of termination resistors are prevented from being respectively coupled between the at least one set of receiving terminals and the reference voltage terminal.
3. The method of claim 1, wherein when the receiver is connected to a transmitter via a cable, the transmitter pulls the voltage level of the detection terminal to a specific level via the cable, and the step of controlling whether to couple the at least one set of termination resistors between the at least one set of reception terminals and the reference voltage terminal, respectively, comprises:
when the detection result indicates that the voltage level of the detection terminal is pulled to the specific level, the at least one set of termination resistors are respectively coupled between the at least one set of receiving terminals and the reference voltage terminal.
4. The method of claim 1, wherein the receiver is an HDMI receiver.
5. The method of claim 4, wherein the at least one set of receive terminals comprises at least one set of differential signal channels with minimized transmission.
6. A receiver, comprising:
a reference voltage terminal for supplying power to the receiver;
a detection circuit, coupled to a detection terminal of the receiver, for generating a detection result according to a voltage level of the detection terminal;
at least one set of receiving terminals for receiving data;
at least one set of termination resistances; and
at least one switching circuit coupled to the at least one set of termination resistors, wherein the at least one switching circuit controls whether to couple the at least one set of termination resistors between the at least one set of receiving terminals and the reference voltage terminal, respectively, according to the detection result.
7. The receiver of claim 6, wherein:
when the receiver has not been connected to a transmitter via a cable, the voltage level of the detection terminal is lower than a certain level; and
when the receiver is connected to a transmitter via a cable, the transmitter pulls the voltage level of the detection terminal to a specific level via the cable.
8. The receiver of claim 7, wherein:
when the detection result indicates that the voltage level of the detection terminal is lower than the specific level, the at least one switching circuit prevents the at least one set of terminal resistors from being coupled between the at least one set of receiving terminals and the reference voltage terminal respectively; and
when the detection result indicates that the voltage level of the detection terminal is pulled to the specific level, the at least one switching circuit couples the at least one set of termination resistors between the at least one set of receiving terminals and the reference voltage terminal, respectively.
9. The receiver of claim 6, wherein the receiver is an HDMI receiver.
10. The receiver of claim 9, wherein the at least one set of receive terminals comprises at least one set of differential signal channels with minimized transmission.
CN201910005699.3A 2019-01-03 2019-01-03 Method for electrostatic discharge protection of a receiver, and receiver Pending CN111404562A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910005699.3A CN111404562A (en) 2019-01-03 2019-01-03 Method for electrostatic discharge protection of a receiver, and receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910005699.3A CN111404562A (en) 2019-01-03 2019-01-03 Method for electrostatic discharge protection of a receiver, and receiver

Publications (1)

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CN111404562A true CN111404562A (en) 2020-07-10

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103794190A (en) * 2012-10-26 2014-05-14 纬创资通股份有限公司 Connecting device with electrostatic discharge protection function
CN105337272A (en) * 2014-08-05 2016-02-17 联发科技股份有限公司 ESD protecting circuit
US20170110170A1 (en) * 2015-10-15 2017-04-20 Samsung Electronics Co., Ltd. Integrated circuit having an electrostatic discharge protection function and an electronic system including the same
WO2018018436A1 (en) * 2016-07-26 2018-02-01 华为技术有限公司 Electrostatic protection circuit
CN108347044A (en) * 2017-01-25 2018-07-31 瑞昱半导体股份有限公司 Electrostatic discharge protection circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103794190A (en) * 2012-10-26 2014-05-14 纬创资通股份有限公司 Connecting device with electrostatic discharge protection function
CN105337272A (en) * 2014-08-05 2016-02-17 联发科技股份有限公司 ESD protecting circuit
US20170110170A1 (en) * 2015-10-15 2017-04-20 Samsung Electronics Co., Ltd. Integrated circuit having an electrostatic discharge protection function and an electronic system including the same
WO2018018436A1 (en) * 2016-07-26 2018-02-01 华为技术有限公司 Electrostatic protection circuit
CN108347044A (en) * 2017-01-25 2018-07-31 瑞昱半导体股份有限公司 Electrostatic discharge protection circuit

Non-Patent Citations (1)

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Title
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Application publication date: 20200710

RJ01 Rejection of invention patent application after publication