By LEIDITECH | 14 March 2024 | 0 Comments
Shanghai Leiditech launchedUSBStatic surge protection scheme for 4 interfaces
one、 USB4 Technical performance characteristics
USB4 isUSB3.2 Subsequent versions of,It's the latestUSBspecification。USB4 is the communication protocol，The hardware interface used isUSB Type-C interface，USB Type-C Port based on USB3.x and USB4 Protocol transmission data。Its interface standard is composed of USB Promoter Group Developed，Mainly standardizedUSB4 Electrical characteristics of the interface、mechanical properties、Protocol specifications and other contents。Here are the following USB4 Some main characteristics：
Ø Data transmission speed：USB4 Interface support up to 40Gbps Data transmission speed，yes USB3.2 Twice the size of the interface。
Ø Power supply capacity：USB4 The maximum power supply capacity of the interface can reach 100W，Can meet the power supply needs of high-performance devices。
Ø Interface type：USB4 The interface adopts USB Type-C interface，Can be plugged in and out in both directions，Easy to use。
Ø compatibility：USB4 Interface backward compatibility USB3.2、USB2.0 and USB1.1 equipment，Compatible with multiple devices。
Ø Protocol support：USB4 The interface supports multiple data transmission protocols，include USB3.2、Thunderbolt 3、DisplayPort etc.。
Ø video transmission ：USB4 Interface support up to 8K Video transmission，Can meet the needs of high-resolution video transmission。
Overall，USB4 A very advanced USBspecification，It provides users with faster data transfer speed、Higher power supply capacity and wider compatibility。
But this kind of USB4 hardware interface USB Type-C Often subjected to electrostatic discharge (ESD)/EOS The impact of the event，Why？
two、 USB4 hardware interface USB Type-C sufferESD/EOS reason
Ø USB Type-C The interface is relatively compact，And the distance between its metal contacts is relatively small，This makes them more susceptible to the effects of electrostatic discharge。
Ø USB Type-C Interface is usually used to connect various electronic devices，These devices may generate different electrostatic discharges，Thereby affecting the normal operation of the interface。
Ø The human body is a common static power source，When we touch USB Type-C At interface time，May transfer static charges from the body to the interface，trigger ESD harm。
Ø Hot swappingOr charging，Failure to properly protect against surge can causeEOSEvent occurrence。
In order to reduce USB Type-C Interfaced ESD harm，Some protective measures can be taken，Shanghai Leimao launchedUSB4 ofESDProtection plan。Before that, we need to understand USB4 What signals are transmitted by the interface， What factors need to be considered for appropriate electrostatic protection of these signals。
three、 USB4 What are the interface signals
USB4 interfaces(USB Type-C )There are a total of 24 pins in the standard，among（Tx1+、Tx1-、Rx1+、Rx1-）Four pins, two differential pairs，Form a channel，The other four pins（Tx2+、Tx2-、Rx2+ Rx2-）Form the second channel。Data is transmitted between two sets of four bidirectional pin pairs。This dual channel configuration operates on a per channel basis 20Gbps Transmission speed of data，When using two channels, the speed can reach 40Gbps。And because USB Type-C The small size of the plug and the tight arrangement of its pins，The pin configuration is shown in the above figure，So it is recommended to use small-sized separationESD(TVS)Do protection，The following introduces each signal function in the interface one by one，And protection methods。
1. Superhigh speedTX+ ,TX- ,RX+, RX- Differential line
high speedDifferential signalline，Supports up to 40Gbps Ultra high speed USB Interface and alternating mode data transmission，Resolution up to 8K (7680 x 4320)，The refresh rate is 60Hz。Due to the interface attempting to maintain extremely high speed while transmitting large amounts of content，Therefore, choose the appropriate one ESD（TVS) Protective devices are crucial。Shanghai Leimao recommends using low junction capacitor 0.2PF，Small volumeDFN0603 Convenient wiring,Bring it back for scanning，Low clamping voltageULC0321SPerform electrostatic protection，Ensure signal integrity。
2. D+/D- Differential line
For USB 2.0 interface，D+ and D- Pin data rate 480Mbps，The voltage on this differential line is normally 5V，Consider line speed and recommend using itULC0521C，Low junction capacitance 0.3PF , Small volumeDFN0603,Convenient wiring。
3. VBUS
VBUS：Power cord，Used for transmitting power supply。Consider usingUSB-PDSatisfy charging，Recommend using high-powerESD(TVS) SMDA24TNPerform electrostatic surge protection, Encapsulated asDFN1610-2 ，Peak current 30A,Power 1650W。
4. CC、SBU
CC1、CC2：Communication channel，Used to identify connected devices and determine power direction。
SBU1、SBU2：Auxiliary channel，Can be used to support high-speed data or other functions。
CC/ SBU Pins are tightly adjacent to each other VBUS Pin。apply USB-PD The words，VBUS The pin voltage can reach 20V，such，CC/SBUPins are prone to short circuits up to 20V, To avoid damage，These two pins are recommended to be 24V ESD（TVS) Protecting：ULC2421。
Do a good job in protecting the above signals，USB4 Will be exempt from some electrostatic surge events。
four、 USB4 Interface electrostatic surge protection scheme
Advantages of the plan：USB4 Interface support up to 40Gbps Data transmission speed，This scheme adopts a low junction capacitance of 0.2PF,Small volumeDFN0603 Packaging,Bring back the discrete components for scanningESD/EOSProtection plan, Convenient wiring，Ensure signal integrity，Can filter out noise，satisfyIEC61000-4-2（Level 4）。The following is an interface protection scheme diagram
Description of ESD (TVS) device parameters used
The Shanghai Leiditech solution is very suitable for protecting USB Type-C connectors that meet USB4 specifications. With this solution, consumers will enjoy a smooth and uninterrupted experience when using their high-performance electronic devices.
A Brief Discussion onS-VIDEOInterface electrostatic surge protection
NB-IoTEquipment antenna electrostatic surge protection scheme
Leave a Reply
Your email address will not be published.Required fields are marked. *