10/100M Ethernet Interface; Ethernet Connection With Transformer; Ethernet Connection Without Transformer - Waveshare WIFI232 User Manual

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WIFI232 User Manual
User can assert nReload signal "0" more than 3‟s through button or MCU pin, then release,
module will restore to factory default configuration and re-start boot up process. User need add
4.7K~10K Ohm pull-up resister external the module.
UART_TXD/RXD- UART port data transmit and receive signal.
There is 1K Ohm pull-down resister internal. User can‟t add pull-up resister at these pins.

3.5.2 10/100M Ethernet Interface

WIFI232 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:

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.
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