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ConnectCore XP 270 module
External schematics for SMSC LAN91C111 Ethernet Controller
+3.3V
LAN91C111
49.9 Ω
24 Ω
TX+
TX -
24 Ω
+3.3V
RX+
RX -
TRANSFORMER
4x75 Ω
RJ45
1
2
3
4
5
6
7
8
10n
LED1
330 Ω
LINK Status
+3.3V
1nF / 2kV
LED2
330 Ω
LAN Activity
+3.3V
ConnectCore XP270
This diagram shows the external components needed for implementing Ethernet
connectivity on a product based on the ConnectCore XP 270 module. SMSC has a
reference design for their LAN91C111 chip (see http://www.smsc.com ). SMSC also
provides an application note, where suggested magnetics are listed (application note
8- 13).
The most important component is the isolation transformer module. Because the
ConnectCore XP 270 uses a supply voltage of 3.3V, a transformer module with a 1:1
ratio between the primary and the secondary windings on the receive side and a ratio
of 1:1 for the Tx path must be used.
These are recommended transformers; this information comes from SMSC application
note 8-13.
10
ConnectCore XP 270 Hardware Reference, Rev. B
01/2006
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