LPCXpresso boards for LPC546xx/LPC540xx/LPC54S0xx families of 
MCUs 
All information provided in this document is subject to legal disclaimers. 
© NXP B.V. 2017-2019. All rights reserved. 
Rev. 2.1 — 7th January 2019 
pins when the EMC bus has been initialized, since these pins are shared 
with the EMC D2-D3 pins, and the SDRAM chip select may float at reset. 
User button 
This button is connected to LPC546x8/540xx/54S0xx port pin P1-1, and 
is provided for user applications. Port P1-1 is pulled to ground when the 
button is pressed. 
External +5V power 
Micro USB connection for power to the LPC546x8/540xx/54S0xx target 
and peripheral circuitry (excluding Link2 Debug Probe).  
LPC546x8/540xx/54S0xx High Speed USB connector (USB1) 
This micro AB connector enables connection from the 
LPC546x8/540xx/54S0xx USB1 port to host or slave devices. An adaptor 
(not supplied) is typically required to connect USB slave devices (mouse, 
keyboard, etc.)  
Note that when using this USB port as a host, power must be supplied 
via the J1 connector in order to power the USB device being connected 
to the board. 
LPC546x8/540xx/54S0xx Full Speed USB connector (USB0) 
This micro AB connector enables connection from the 
LPC546x8/540xx/54S0xx USB1 port to host or slave devices. An adaptor 
(not supplied) is typically required to connect USB slave devices (mouse, 
keyboard, etc.)  
Note that when using this USB port as a host, power must be supplied 
via the J1 connector in order to power the USB device being connected 
to the board. Also note that jumpers JP9 through JP13 must be changed 
from their default position to use this port in host mode. 
LPC546x8/540xx/54S0xx Ethernet connector 
This RJ45 connector provides a 10/100Mbps connection to the Ethernet 
PHY being driven by the LPC546x8/540xx. 
Audio line input jack 
3.5mm audio input jack for the audio codec 
Audio line output jack 
3.5mm audio input jack for the audio code 
SD/MMC card slot 
Full size SD/MMC card slot connected to the SDIO interface of the 
LPC546x8/540xx. 
Link2 Debug Probe connector 
Micro USB type B connection for the on-board Link2 Debug Probe. Note: 
do not use this connection when using an external Debug Probe. 
Expansion connectors 
0.1” pitch connectors for addition of Arduino R3 shield or other 
expansion daughter boards / circuitry. 
Peripheral expansion PMod connector 
0.1” pitch 2x6 connector following the PMod standards. This connector is 
primarily intended for adding external peripherals using I
2
C and/or SPI 
bus, but is also suitable for general purpose I/O connections. 
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