Echelon LonWorks Router User Manual
Page 86
Connecting Half-Routers: Series 5000 and Series
3100
You can connect a Series 5000 half-router to a Series 3100 half-router to provide
routing functions for transceiver and channel types that the Series 5000 router
chip does not directly support, for example, a PL-20 channel.
Important: Echelon provides special licensing for many of these other
transceiver types, such as a Power Line Smart Transceiver; contact Echelon
Support for additional information.
Figure 39 shows the basic connections for a router based on a Series 3100 half-
router and a Series 5000 half-router. These connections include:
•
Power and ground connections ― Use a low-dropout voltage regulator (+5
V input from the Series 3100 half-router power supply, and +3.3 V output
for the Series 5000 router chip), such as an NXP TDA3663 very low
dropout voltage/quiescent current 3.3 V voltage regulator. See Power and
Ground for other power considerations for the Series 5000 router chip.
•
I/O connections ― Connect the Series 3100 IO[11..0] pins to the Series
5000 router IO[11..0] pins, with 10 kΩ resistors for the IO6, IO7, IO10,
and IO11 pins, as described in IO[11..0]. No level shifters are required.
•
Reset pin connection ― Connect the Series 3100 RESET~ pin and the
Series 5000 router RST~ pin, along with the associated Reset button,
LED, clamping diodes, and EMC capacitors, as described in RST~.
•
Service pin connection ― Connect the Series 3100 SERVICE~ pin and
the Series 5000 router SVC~ pin, along with the associated Service
button, LEDs, and clamping diodes, as described in SVC~.
•
Clock circuitry ― If the Series 3100 router-half requires a 10 MHz input
crystal, you can use a single crystal for both router halves and drive the
Series 3100 CLK1 pin from the Series 5000 router XOUT pin, using a
standard (inverting or non-inverting) bus buffer/line driver that supports
TTL-compatible input and 5V CMOS output, such as an NXP
74AHCT1G04 (or a 74AHCT1G126 with OE tied high) – see Figure 35
for an exemplar clock circuit. However, if the Series 3100 half-router
requires an input clock frequency other than 10 MHz, or is a Power Line
Series 3100 half-router, do not connect the Series 5000 router XOUT pin
to the Series 3100 CLK1 pin, but instead use separate input crystals for
each router-half. See FT Router 5000 Pinout.
Figure 12 shows the pinout for the FT Router 5000 chip. The central
rectangle in the figure represents the bottom pad (pin 49), which must be
76
Developing a LONWORKS Router