NXP Semiconductors
UM11192
User Manual for LPCXpresso54S018M Development Board
UM11192
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2019. All rights reserved.
User manual
Rev. 1.0
— 13th February 2019
26 of 34
10. Other board features
This section describes board functions not mentioned elsewhere in this document.
10.1 LCD with capacitive touch
The LPCXpresso54S018M has connectors and adhesive pads for a Rocktech LCD to be
added by the user. This LCD panel may be ordered from
https://www.nxp.com
(use part
number RK043FN02H-CT). When installing the panel it is recommended that an example
program that uses the LCD panel (such as the emWIN examples provided in the SDK) is
used to test the connections before securing the panel in place with the adhesive pads.
Note: The LCD data lines are shared with the PDM0 interface of the LPC54S018J4M
device (the LCD is enabled by default), and solder jumpers may need to be modified to
change between these configurations (see section
10.5
for more details.)
On-board voltage pump circuitry is provided to drive the LCD backlight using an
AP5724WG device. This is enabled using PIO3-31.
The MCUXpresso SDK includes drivers and example applications for the LCD and
capacitive touch controller.
10.2 Audio codec
The LPCXpresso54S018M board incorporates a Cirrus Logic (Wolfson) WM8904 audio
codec, powered via a dedicated regulator. This codec has both I
2
C (for control) and I
2
S
(for data) interfaces.
The I
2
C interface of the codec is routed to Flexcomm 2 of the LPC54S018J4M, the same
connection as used for the other I
2
C devices on the board; the Codec has an address of
0b0011010.
The Flexcomm 6 and Flexcomm 7 interfaces of the LPC54S018J4M are connected
respectively to the Codec for data sent to / received from the Codec. These I
2
S
connections from the LPC54S018J4M are also connected to the Expansion connectors
(see Section 8.5 for more information); solder jumpers may be removed to disconnect the
on-board codec if an external I
2
S device is to be used instead.
The line input to the codec is routed to a 3.5mm stereo jack socket (J5) through the
circuit shown in Fig 7.