10/100M Ethernet Interface; Ethernet Connection With Transformer; Ethernet Connection Without Transformer - Jinan USR IOT Technology USR-WIFI232-A2 User Manual

USR-WIFI232-A2 User Manual http://www.usriot.com

3.5.2 10/100M Ethernet Interface

USR-WIFI232-A/B/C modules provide one 10/100M Ethernet PHY layer interface for data
transition or user configuration. This Ethernet support with transformer and without transformer
(PHY-to-PHY) 2 kinds of connection.

3.5.2.1 Ethernet Connection with Transformer

User board put Ethernet transformer and RJ-45 connector. This is a general 10/100M Ethernet
phy layer connection. The reference design as following:
(Above is for USR-WIFI232-A2 pin type module)
Ethernet Reference Design with Transformer
Figure 11

3.5.2.2 Ethernet Connection without Transformer

For this application, Ethernet will work as internal data transmition interface and save one
transformer and RJ45 connector. Ethernet PHY-to-PHY connection will use AC coupled
connection. This is a space and cost optimized solution. Hardware reference design as following:
Note: VCC signal at reference design shall base on user board PHY chipset voltage level, such
as 2.5V power supply for general Ethernet PHY chipset.
(Above is for USR-WIFI232-A2 pin type module)
Ethernet Reference Design without Transformer
Figure 12
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