Datasheet

NXP Semiconductors
UM11035
LPCXpresso boards for LPC546xx/LPC540xx/LPC54S0xx families of
MCUs
UM11035
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© NXP B.V. 2017-2019. All rights reserved.
User manual
Rev. 2.1 — 7th January 2019
27 of 36
being used (these are included in the MCUXpresso IDE). Refer to your tool chain vendor
for more information. SEGGER J-link includes drivers for both of these devices.
Note that the LPCXpresso546x8/540xx/54S0xx board is also designed to accommodate
a Macronix MX25R6435FM2IL0 quad SPI flash as a reference for customers considering
a 1.8V based design.
9. Other board features
This section describes board functions not mentioned elsewhere in this document.
9.1 LCD with capacitive touch
The LPCXpresso54608/54628/54018 include a Rocktech RK043FN02H-CT color LCD
display panel with a resolution of 272x480 pixels and a capacitive touch controller. The
LCD and capacitive touch controller interface to the main board via flex cables routed
beneath the LCD panel. The LCD panel is secured using multiple adhesive pads. It is not
recommended to remove the panel because these adhesive pads will need to be
replaced afterwards to ensure the mechanical integrity of the flex cable connections.
The LPCxpresso54S018 has connectors and adhesive pads for the 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) 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
LPC546x8/540xx/54S0xx device (the LCD is enabled by default), and solder jumpers
need to be modified to change between these configurations (see section 9.5 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.
9.2 Audio codec
The LPCXpresso546x8/540xx/54S0xx 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 off the LPC546x8/540xx, 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 LPC546x8/540xx/54S0xx are
connected respectively to the Codec for data sent to / received from the Codec. These
I
2
S connections from the LPC546x8/540xx/54S0xx are also connected to the Expansion
connectors (see Section 7.5 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 6.