Using LAN8720 modules as Ethernet interface for custom LPC1768 mbed boards
Page last updated 05 Aug 2017, by 
Zoltan Hudak.
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Zoltan Hudak.
0
replies
Although the original LPC1768 mbed board is featuring a DP83848 chip, because there are available low cost (about $2.50) LAN8720 modules from various sellers I decided to give it a try. For more details about LAN8720 see the datasheet.
LAN8720 Ethernet Physical Layer Transceiver module
Unfortunately the RX_ER pin was not available at the module's connector. So I took a thin wire, soldering iron and connected it to the NC (Not Connected) pin.
LAN8720 module pinout
Wiring
| LAN8720 module | LPC1768 board | |||
|---|---|---|---|---|
| TX1 | <=> | 94 | ||
| RX_ER | <=> | 89 | ||
| TX_EN | <=> | 93 | ||
| TX0 | <=> | 95 | ||
| RX0 | <=> | 91 | ||
| RX1 | <=> | 90 | ||
| nINT/RETCLK | <=> | 88 | ||
| CRS | <=> | 92 | ||
| MDIO | <=> | 86 | ||
| MDC | <=> | 87 | ||
| GND | <=> | GND | ||
| VCC | <=> | +3.3V |
MBED library modifications
No MBED library modifications are needed.
Tested with
TCPSocket_HelloWorld
mbed-os-example-sockets
WebSwitch_mbed-dev
WebSwitch_mbed-os
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Using LAN8720 modules as Ethernet interface for custom LPC1768 mbed boards
Page owner: Zoltan Hudak
Created 20 Apr 2017.
Last updated 05 Aug 2017