Echelon LonWorks Router User Manual
Page 97
information about PCB layout and electromagnetic compatibility (EMC) design
guidelines for a Series 5000 Chip, including the Router 5000.
Power Supply
Circuitry
Power Supply
Connector
Center of
Star Ground
ESD
Keepout
Area
Network
Connector
TPT/XF-1250
PCB
Figure 42. Example PCB Layout for a Router 5000 with a TPT/XF-1250 Transceiver
In the figure, the area marked CORE represents the essential circuitry for the
Router 5000, its 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.
The differential driver circuit is shown as U101 and associated parts. The
comparator circuit is shown as U103, U104, and associated parts. The TPT/XF-
1250 transceiver is shown as U102, although the transceiver itself resides on a
separate sub-assembly PCB, above the main board and is connected to it by two
headers (one 6-pin header and one 3-pin header). Below the TPT/XF-1250
L
ON
W
ORKS
Router User’s Guide
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