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RS-485 Port Protection
Evaluation Board 2
Introduction
This evaluation board serves as an aid in
evaluating circuit protection on RS-485
serial device port solutions using Bourns?
TBU? High-Speed Protector (HSP), MOV
and TVS products to meet the required
industry standards on RS-485 port
J1
2
1
Line A
Unprotected
MOV1
40 mils trace
GDT1
3
1
TBU? HSP 1
GDT3
2
TVS1
1
TVS3 2
2
3
3
TVS5
1
2
Protected
I
NU
I
II
II
II
I
Load A
TISP1
2
1
J3
J2
TVS4 1
TISP2
interfaces.TherecommendedBourns?
TBU? HSP solution offers enhanced
performance features over competing
technologies, which can help the design
engineer to increase the surge & transient
1
2
Line B
Figure 1
MOV2 GDT2 TVS2
TBU? HSP 2
1 2
Unprotected 40 mils trace
RS-485 Evaluation Board 2 Schematic
3
II
Protected
NU
I
Load B
1
2
J4
protection level on RS-485 ports and place
the entire circuit protection solution into
a smaller PCB area. Bourns has developed
a RS-485 evaluation board (measuring 50
mm x 25 mm x 1.2 mm) manufactured
using FR4 PCB with nickel gold plating on
top and bottom sides.
How to Connect the Evaluation
Board for Test Set-up
? Connect J1 and J2 to the exposed lines.
? Connect J3 and J4 to the RS-485
IC device.
Figure 2
RS-485 Evaluation Board 2 Top Side Layout*
* In addition to the two TBU? HSPs, the default
configuration of this board uses two MOVs (MOV1,
MOV2) and a single TVS diode array (TVS5). The board
allows different configurations:
? 2 MOVs (MOV1 and MOV2) may be replaced by
a) 2 single 2031 GDTs (GDT1 and GDT2)
or b) a dual 2030 GDT (GDT3)
? 1 TVS diode array (TVS3) may be replaced with
a) 2 SMB TVS diodes (TVS1, TVS2) or b) 2 SOT23
TVS diodes (TVS3, TVS4) or c) 2 SOT23-5 thyristor
devices (TISP1, TISP2)
Table 1
No.
1
2
3
RS-485 Evaluation Board 2 Bill of Materials
Part Number Qty. Description
TBU-CA065-300-WH 2 TBU? Single Bidirectional Line 650 V 300 mA
MOV-10D201K 2 Single Line 10 mm MOV 200 V
CDSOT23-SM712 2 Dual Bidirectional Line 7 V / 12 V
Reference
TBU? HSP 1, TBU? HSP 2
MOV1, MOV2
TVS5
10/12 ? FU1213
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