RS-485EVALBOARD2 Bourns Inc., RS-485EVALBOARD2 Datasheet
RS-485EVALBOARD2
Manufacturer Part Number
RS-485EVALBOARD2
Description
TBU EVAL BOARD PORT RS-485
Manufacturer
Bourns Inc.
Series
TBU®r
Datasheet
1.RS-485EVALBOARD2.pdf
(2 pages)
Specifications of RS-485EVALBOARD2
Main Purpose
Circuit Protection, Transient Voltage Suppression (TVS)
Embedded
No
Utilized Ic / Part
TBU-CA065-300-WH
Primary Attributes
-
Secondary Attributes
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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
interfaces. The recommended Bourns®
TBU® HSP solution offers enhanced
performance features over competing
technologies, which can help the design
engineer to increase the surge & transient
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
* 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:
• Connect J1 and J2 to the exposed lines.
• Connect J3 and J4 to the RS-485
• 2 MOVs (MOV1 and MOV2) may be replaced by
• 1 TVS diode array (TVS3) may be replaced with
IC device.
a) 2 single 2031 GDTs (GDT1 and GDT2)
or b) a dual 2030 GDT (GDT3, not yet released)
a) 2 SMB TVS diodes (TVS1, TVS2) or b) 2 SOT23
TVS diodes (TVS3, TVS4) or c) 2 SOT23-5 thyristor
devices (TISP1, TISP2)
RS-485 Port Protection
Evaluation Board 2
Figure 1
Figure 2
Table 1
J1
J2
No.
1
2
3
2
1
1
2
Line A
Line B
TBU-CA065-300-WH
Part Number
CDSOT23-SM712
MOV-10D201K
Unprotected
MOV1
MOV2
Unprotected
RS-485 Evaluation Board 2 Schematic
RS-485 Evaluation Board 2 Top Side Layout*
RS-485 Evaluation Board 2 Bill of Materials
5/11 • FU1107
GDT1
GDT2
40 mils trace
40 mils trace
3
Qty.
2
2
2
GDT3
1
1
TBU® HSP 1
TBU® HSP 2
TBU® Single Bidirectional Line 650 V 300 mA
Dual Bidirectional Line 7 V / 12 V
Single Line 10 mm MOV 200 V
2
2
TVS1
TVS2
Description
TVS3
TVS4
1
2
2
1
3
3
3
TVS5
1
2
Protected
Protected
NU
TBU® HSP 1, TBU® HSP 2
II
II
I
I
Reference
MOV1, MOV2
I
NU
I
II
II
Load A
Load B
TISP1
TISP2
TVS5
2
1
1
2
J3
J4
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RS-485EVALBOARD2 Summary of contents
Page 1
... 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 addition to the two TBU® HSPs, the default configuration of this board uses two MOVs (MOV1, MOV2) and a single TVS diode array (TVS5) ...
Page 2
... Figure 5 120 V rms Reference For more information on implementing advanced circuit protection technologies for RS-485 ports, please review the Bourns RS-485 application note: http://www.bourns.com/data/global/pdfs/bourns_cpk1114_rs485_circuit_protection_appnote.pdf For further technical support and for complete circuit protection solutions, please visit www.bourns.com ...