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Ft router 5000 – Echelon LonWorks Router User Manual

Page 98

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transceiver PCB are the clamping diodes (D6-D9) for the transceiver’s receive

signals.

FT Router 5000

Figure 43 shows a portion of the top layer of a 4-layer PCB layout for an FT

Router 5000 half-router, including the FT-X3 Communications Transformer and

the other building blocks of a PCB design.
See Chapters 3 and 4 of the Series 5000 Chip Data Book for additional

information about PCB layout and electromagnetic compatibility (EMC) design

guidelines for a Series 5000 Chip, including the FT Router 5000.

Network

Connector

Power Supply

Circuitry

Power Supply

Connector

Center of

Star Ground

EMC

Keepout

Area

Figure 43. Example PCB Layout for an FT Router 5000

In the figure, the area marked CORE represents the essential circuitry for the FT

Router 5000, the FT-X3 Communications Transformer, the router chip’s serial

EEPROM memory chip, its crystal, and associated capacitors and resistors. The

figure does not show I/O or other connections to the other side of the router.

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LONWORKS Router Design Issues