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ESD防护指南
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2024-05-02
10:19:33
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ESD防护指南
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APPLICATION GUIDE
ESD PROTECTION
介面
INTERFACE
HDMI 1.4
HDMI 2/UHD/4K
Flex Ray
e SATA
CANBUS
CONTROL IOS
100MB
ETHERNET
1G
10G
POE/POEP
T1/E1-T3/E3
USB 2.0
USB 3.0
USB 3.1
USB 3.2
XDSL
LVDS
LINBUS
RS-232
RS-485
SMART BATTERY
COMMUNICATION APPLICATIONS
介面
INTERFACE
HDMI 1.4
HDMI 2/UHD/4K
Flex Ray
e SATA
CANBUS
CONTROL IOS
100MB
ETHERNET
1G
10G
POE/POEP
T1/E1-T3/E3
USB 2.0
USB 3.0
USB 3.1
USB 3.2
XDSL
LVDS
LINBUS
RS-232
RS-485
SMART BATTERY
ESD Protection
Solutions for High Speed
Communication Ports
•
Electrostatic discharge (ESD) occurs when a charge is
exchanged between two objects of unequal charge
potential. ESD most often occurs between people
and metal objects.It is a result of an electron build-
up behaving as capacitor when dielectric isolation
is available. Manmade materials, such as shoe soles,
achieve dielectric isolation while someone walks on
carpet creating kinetic energy. The potential threat of an
ESD transient poses a challenge to system designers to
incorporate overvoltage protection. Often,the included
protection must have capacitance while not degrading the
transmission rate. Traditionally,the use of a high capacitor
was used to provide protection. However,due to high
speed requirements, the capacitance perline must be
signicantly reduced. It must be done while still providing
overvoltage protection against potential threats. Threats
can include ESD, electrical fast transients (EFT), or surges.
This paper discusses standard requirements for ESD. It
highlights overvoltage protection solutions for the most
common high speed interfaces. These include USB,HDMI
and Ethernet ports, as shown in Table 1.
Application Data Rate Capacitance
RS-232 0.20 Mbit/S < 50 pF
T1
1.544 Mbit/S
< 30 pF
E2
2.048 Mbit/S
I2C
3.4 Mbit/S
Ethernet
10 Mbit/S
USB1.1
12 Mbit/S
< 20 pF
E3
34.368 Mbit/S
RS-485
35 Mbit/S
T3
44.736 Mbit/S
Fast Ethernet
100 Mbit/S < 5 pF
T5
400.352 Mbit/S
< 3 pF
USB 2.0
480 Mbit/S
E5
565.148 Mbit/S
IEEE-1394b
786.432 Mbit/S
Gigabit E
565.148 Mbit/S
DVI
3960 Mbit/S
< 1 pF
USB 3.0
5000 Mbit/S
DisplayPort
5400 Mbit/S
SATA 3.0
6000 Mbit/S
HDMI 1.3
10200 Mbit/S
HDMI 2.0
10800 Mbit/S
Automotive interfaces
•
CAN
Part No. V
RWM
P
PK
, 8/20uS C
J
, Max. ESD Level Package
FSSU24T23A 24V 350 Watts 45 pF 30KV SOT-23
FDA2431T 24V 230 Watts 30 pF 30KV SOT-23
SOT24C 24V 160 Watts 50 pF 30KV SOT-23
FM712 7V / 12V 400 Watts 75 pF 30KV SOT-23
CMC
optional
CMC Line
SPLIT
CANH
CAN
Xceiver
CANH
ESD Protection
CAN system architecture with a single
device to protect the CAN node
Automotive interfaces
•
LIN
Part No. V
RWM
P
PK
, 8/20uS C
J
, Max. ESD Level Package
ESD1524VD 15V/24V 160 Watts 20 pF 30KV SOD-323
LIN system architecture with a single
device to protect the LIN node
VBAT
LINLIN
Xceiver
GND
ESD1524VD
C
MASTER/SLAVE
LIN Connector
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