NXP Semiconductors LPCXpresso54608 User manual

UM11035
LPCXpresso54608/54618/54S618 Board User Manual
Rev. 1.0 —18 November 2016
User manual
Document information
Info
Content
Keywords
LPCXpresso54608, LPCXpresso54618, LPCXpresso54S618,
OM13092, OM13094, OM13095
Abstract
LPCXpresso546xx User Manual
This datasheet has been downloaded fromhttp://www.digchip.com at this page

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Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [e-mail]
Revision history
Rev
Date
Description
1.0
20161118
Initial revision

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1. Introduction
The LPCXpresso™ family of boards provides a powerful and flexible development
system for NXP's LPC Cortex®-M family of MCUs. They can be used with a wide range
of development tools, including NXP’s MCUXpresso IDE. The LPCXpresso54608
(OM13092) / LPCXpresso54618 (OM13094) / LPCXpresso54S618 (OM13095) share the
same design and have been developed by NXP to enable evaluation of and prototyping
with the LPC546xx family of MCUs. There is no functional difference between these
boards except the (1) functionality of the LPC546xx device installed, and (2) that the
LPC54618 board does not include the LCD panel. All boards use a BGA180 package.
The schematics show that the board was designed for either 1.8 V or 3.3 V build
configurations, but all production boards are built in the 3.3 V configuration.
Fig 1. LPCXpresso546xx underside view
This document describes the hardware of the LPCXpresso546xx boards. The following
aspects of interfacing to the board are covered by this guide:
Main board features.
Setup for use with development tools.
Board interface connectors.
Jumper settings.

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2. Feature summary
The LPCXpresso546xx board includes the following features:
On-board, high-speed USB based, Link2 debug probe with CMSIS-DAP and
SEGGER J-Link protocol options:
Link2 probe can be used with on-board LPC546xx or external target.
UART and SPI port bridging from LPC546xx target to USB via the on-board
debug probe.
Support for external debug probe.
3 x user LEDs
Target Reset, ISP (3) and user buttons
Expansion options based on popular standards:
Arduino UNO compatible expansion site with additional LPCXpresso V3 standard
connections
PMod™ compatible expansion port
On-board 3.3V regulator with external power supply options.
Built-in power consumption measurement for target LPC546xx MCU.
128Mb Micron MT25QL128 Quad-SPI flash.
8MB Micron MT48LC8M16A2B4 SDRAM.
Knowles SPH0641LM4H digital microphone.
Full size SD/MMC card slot.
NXP MMA8652FCR1 accelerometer.
Stereo audio codec with line in/out.
High and full speed USB ports with micro A/B connector for host or device
functionality.
10/100Mbps Ethernet (RJ45 connector).
272x480 color LCD with capacitive touch screen.
2.1 Board layout and settings
This section provides a quick reference guide to the main board components,
configurable items, visual indicators, and expansion connectors. Fig 2 shows the layout
of the components on the LPCXpresso546xx board.

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(1) Red is used to highlight key components, brown for buttons and LEDs, green for connectors and blue for expansion
connectors.
Fig 2. LPCXpresso546xx main feature layout
The LCD panel is mounted on the reverse side of the board, connected to the circuitry
via two flex cable connectors. It should not normally be necessary to remove the LCD or
access these connectors; the LCD is held in place by 4 double-sided adhesive pads.
Fig 3 shows the location of indicators and jumpers.
SD/MMC socket
Ethernet
(RJ45)
Audio jacks
In Out
Debug
probe
(micro B)
Ext.
Debug
Probe
Header
Target
MCU
LPC54608
Peripheral
Pmod
connector
Host
Expansion
Header
Additional host
connector Arduino/LPCXpresso V3 expansion connectors
Power
(micro B)
High speed
USB port
(micro AB)
Full speed
USB port
(micro AB)
Link2
Debug
Probe
(LPC43xx)
SDRAM
Quad
SPI flash
Reset
ISP3
User
LEDs
ISP2 ISP0 User
Audio
codec
Digital
mic

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Fig 3. Jumper and LED locations
Table 1 lists the function of each jumper.
Table 1. Jumpers
Circuit ref
Description
Section
JP1
Target processor selection for the on-board debug probe.
Jumper open (default) the LPC546xx Target SWD interface
enabled. Normal operating mode where the Target SWD is
connected to either the on-board Link2 debug probe or an external
debug probe.
Jumper shunted, the LPC546xx Target SWD interface is disabled.
Use this setting only when the on-board Link2 debug probe is used
to debug an off-board target MCU.
3, 4
Debug probe
DFU boot
JP1 JP2
JP5
JP6
JP9
JP7 JP3
JP10
JP11 JP12
JP13
JP4
Reset LED
Power LED
SD/MMC card
Power LED
Link2 boot LED

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Circuit ref
Description
Section
JP2
Buffer Power Selection
For On-board Target place in position 1-2 (default)
For Off-board Target place in position 2-3
3, 4
JP3
This header (not installed by default) provides a convenient
connection point to provide external ADC positive and negative
voltages. To inject these voltages at this header SJ22 (for VREFN)
and/or SJ23 (for VREFP) need to be moved from the default 1-2
position to the 2-3 position.
See
Schematic
JP4
This set of 3 jumpers control various selections for power
measurement:
Position 1-2 and 3-4 are in parallel with 1 ohm resistors. Current
can be measured across these jumper headers to determine
current flow into the LPC546xx target.
Position 5-6 (installed by default) can be left open and a current
meter connected between these pins to directly measure current
flow into the LPC546xx target.
JP5
Link2 (LPC43xx) force DFU boot –2 position jumper pins.
1) Jumper open (default) for Link2 to follow the normal boot
sequence. The Link2 will boot from internal flash if image is found
there. With the internal flash erased the Link2 normal boot
sequence will fall through to DFU boot.
Jumper shunted to force the Link2 to DFU boot mode. Use this
setting to reprogram the Link2 internal flash with a new image
(using the LPCScrypt utility) or to use the MCUXpresso IDE with
CMSIS-DAP protocol.
Note that the LPCXpresso546xx Link2 flash is pre-programmed
with a version of CMSIS-DAP firmware by default.
JP6
Bridge / Host Expansion Header selector.
Revision B boards:
When open (default), the SPI connections from Flexcomm3 the
LPC546xx are driven to the Link2 debug probe.
Install JP6 when using the SPI interface at connector J14. Note
that this disables the Link2 SPI (bridge) probe connection.
Revision C boards:
When open (default), the “Bridge” UART and SPI connections from
the Link2 probe are driven to the LPC546xx target.
Install JP6 when using the SPI interface at connector J14 and/or
FC0 UART at P4 (FTDI). Note that this disables the Link2 SPI and
UART (bridge) probe connections.
JP7
(not
installed by
default)
JP7 may be fitted to provide a convenient way to enable/disable
the reset signal to/from the expansion connectors. Solder jumper
JS28 should be removed if JP7 is to be used.
See
schematic

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Circuit ref
Description
Section
JP8
This set of jumpers is used to configure 3.3V vs 1.8V board
configurations. OM13092 boards are all 3.3V, so these jumpers
should not be changed from the default.
JP8 is not present on Revision C boards (functionality has been
replaced by zero ohm links).
See
schematic
JP9
USB host Vbus selection
Note that only one of USB0 or USB1 can be configured as a USB
host port at any given time (this is a board restriction, not a
limitation of the LPC546xx.)
Install jumper in position 1-2 for USB1 (High Speed) to provide
Vbus (i.e. enable USB host capability) (Default)
Install jumper in position 2-3 for USB0 (Full Speed) to provide Vbus
(i.e. enable USB host capability)
JP10
USB host power control selection
This jumper selects routing of USB port power and overcurrent
detect from either the USB0 or USB1 ports of the LPC546xx. Note
that only one of USB0 or USB1 can be configured as a USB host
port at any given time (this is a board restriction, not a limitation of
the LPC546xx.)
Leave open when using USB1 (High Speed) as a USB host
(Default)
Install jumper for USB0 (Full Speed) to provide Vbus (i.e. enable
USB host capability)
JP11 &
JP12
USB0 host / Ethernet TXD/RXD selection
Due to sharing of pin functionality on this development board, it is
not possible to support the Ethernet port and USB0 overcurrent
feature simultaneously. For both JP11 and JP12:
Install jumper in position 1-2 to enable Ethernet (Default)
Install jumper in position 2-3 for USB0 (Full Speed) (i.e. enable
USB host capability)
JP13
USB0 host / Ethernet selection
Due to sharing of pin functionality on this development board, the
P4-7 port pin is used for either the USB0 port or as a general
purpose signal on the expansion connector.
Install jumper in position 1-2 to route P4-7 to the expansion
connector.
Install jumper in position 2-3 for USB0 (Full Speed) (i.e. enable
USB host capability)
Table 2 describes the board LED and button functions, and connectors.

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Table 2. LEDs, buttons and connectors
Circuit Ref
Description
Section
D7
SD card slot power enable
This LED illuminates when power is enabled to the SD card
slot (controlled by LPC546xx port P2-5.)
n/a
D9, D11, D12
User LEDs
These LEDs are for application use. They are illuminated
when the driving signal from the LPC546xx is low. The LEDs
are driven by ports P2-2 (D9), P3-3 (D11) and P3-14 (D12).
n/a
D10
Link2 boot mode
Link2 LPC43xx BOOT0_LED indicator. Reflects the state of
LPC43xx Link2 MCU P1_1. When the boot process fails,
D1 will toggle at a 1 Hz rate for 60 seconds. After 60
seconds, the LPC43xx is reset.
n/a
D14
Target power
This LED illuminates when the 3.3V supply to the LPC546xx
is present.
n/a
D15
Reset LED
This LED illuminates when reset is asserted either via the
expansion connector or when reset button SW1 is pressed.
n/a
SW1
Reset button
Press and release this button to reset the LPC546xx. Note
that this does not reset the Link2 debug probe.
n/a
SW2, SW3, SW4
ISP / User buttons
These switches can be used to force the LPC546xx in to
ISP boot modes, as shown below. Signal is low when the
button is pressed.
Mode / Boot source
ISP2
(P0-6)
ISP1
(P0-5)
ISP0
(P0-4)
Internal flash boot
High
High
High
USB1 (High speed)
Low
High
High
CAN
High
Low
Low
USB0 (Full speed)
High
Low
High
USART/I2C/SPI
High
High
Low
The ISP pins are sampled by the LPC546xx boot ROM code
immediately following reset, so to initiate an ISP boot press
and hold the required ISP buttons while pressing and
releasing the reset button (SW1.)
Following reset, these buttons may also be used by a user
application.

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Circuit Ref
Description
Section
SW5
User button
This button is connected to LPC546xx port pin P1-1, and is
provided for user applications. Port P1-1 is pulled to ground
when the button is pressed.
J1
External +5V power
Micro USB connection for power to the LPC546xx target and
peripheral circuitry (excluding Link2 Debug Probe).
J2
LPC546xx High Speed USB connector (USB1)
This micro AB connector enables connection from the
LPC546xx 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.
J3
LPC546xx Full Speed USB connector (USB0)
This micro AB connector enables connection from the
LPC546xx 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.
J4
LPC546xx Ethernet connector
This RJ45 connector provides a 10/100Mbps connection to
the Ethernet PHY being driven by the LPC546xx.
J5
Audio line input jack
3.5mm audio input jack for the audio codec
J6
Audio line output jack
3.5mm audio input jack for the audio code
J7
SD/MMC card slot
Full size SD/MMC card slot connected to the SDIO interface
of the LPC546xx.
J8
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.
J9, J10, J12, J13
Expansion connectors
0.1” pitch connectors for addition of Arduino R3 shield or
other expansion daughter boards / circuitry.

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Circuit Ref
Description
Section
J11
Peripheral expansion PMod connector
0.1” pitch 2x6 connector following the PMod standards. This
connector is primarily intended for adding external
peripherals using I2C and/or SPI bus, but is also suitable for
general purpose I/O connections.
J14
Host/peripheral expansion connector
0.1” pitch 2x6 connector for host connection / expansion.
This connector is primarily intended for connection and
external host using I2C and/or SPI bus, but is also suitable
for general purpose I/O connections or peripherals.
J15
Host reset control
This connector provides a reset input to the LPC546xx along
with ground signals.
J16, J17
LCD and touch screen display connectors
These connector is dedicated for the LCD and touch screen.
They are located under the LCD panel and should not be
handled by the user unless instructed to do so by NXP.
n/a
3. Getting Started
The LPCXpresso546xx board is pre-programmed with a demo application showcasing
TouchGFX Graphics from Draupner. Connect a micro USB cable from connector J8 or J1
to a power source (computer or power supply) and the board will boot within a few
seconds and run this demonstration. The rest of this section describes how to download
other sample programs using mass storage boot and how to start code development with
the board, assuming the on-board Link2 debug probe will be used. For further
information on TouchGFX please visit the Draupner Graphics website at
http://touchgfx.com/en/nxp-semiconductors/
This section describes how to download pre-built binary images to the LPCXpresso546xx
board using its mass storage device capability, and how to set up the board to start
debugging sessions using popular development tools.
3.1 Loading applications using USB mass storage boot (MSC class)
mode
The LPC546xx device supports mass storage boot mode, enabling “drag and drop”
programming. Note that this method requires a binary file which can be generated from
any toolchain supporting the LPC546xx. Refer to the documentation for your tools to
determine how to generate a binary file. Note that this method cannot be used to load
binary files that require data to be programmed into SPI flash.
Mass storage mode boot is possible via the High Speed (USB1) or Full Speed (USB0)
ports. The High Speed port will provide significantly shorter programming times for larger
binary files.
To program the LPC546xx in mass storage mode follow these steps:
1. If using the full-speed port:

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a. Connect host computer to J3. Press and hold the ISP1 button while
pressing and the releasing the Reset button.
b. If using the high-speed port: connect host computer to J2. Press and
hold the ISP2 button while pressing and the releasing the Reset button.
2. The host computer should show a mass storage device called CRP_DISABLD.
3. Open the MSC device and delete the file firmware.bin. Note that afterwards, even if
the flash is in principle empty, the PC will read it as fully occupied memory.
4. Drag and drop the new binary file to the drive. Note that this new file must have the
name firmware.bin, otherwise the file seems to be transferred and program but in fact
it is not.
5. Reset the board. The application will now run.
3.2 Starting a debug session using the on-board (Link2) debug probe
By default, the LPCXpresso546xx is configured to use the on-board debug probe (Link2)
to debug the on-board target (LPC546xx), using the CMSIS-DAP debug protocol pre-
programmed into the Link2 Flash memory. The MCUXpresso IDE or other development
tools that support the CMSIS-DAP protocol can be used in the default configuration.
Check with your toolchain vendor for availability of specific device support packs for the
LPC54600 family of devices.
Note that when using the MCUXpresso IDE, the on-board Link2 can also be booted in
DFU mode by installing a jumper on JP5; if this is done then the IDE will download
CMSIS-DAP to the probe as needed. Using DFU boot mode will ensure that the most up-
to-date / compatible firmware image is used with the IDE. Note that spare jumpers are
provided in the board packaging.
3.2.1 Installation steps for use with MCUXpresso IDE
(Note: MCUXpresso IDE will be released for general availability in March 2017.)
1. Download and install the MCUXpresso IDE.
2. Recommended: Install JP5 to force the Link2 debug probe to boot in DFU mode (see
notes above).
3. Ensure jumper JP2 is fitted in position 1-2 (local target powered), and JP1is not
installed (target SWD enabled). These are the default positions set during board
manufacture.
4. Connect the LPCXpresso546xx board to the USB port of your host computer,
connecting a micro USB cable to connector J8 (“USB Debug-Link”). The board will
boot and run the TouchGFX graphics demo.
5. Allow about 10 seconds for the LPCXpresso546xx devices to enumerate for the first
time; the device will appear as “LPC Device”.
The board is now ready to be used with the MCUXpresso SDK examples for
LPCXpresso546xx.
When the board is used for the first time, it is recommended to force the LPC546xx target
into a known state by performing an ISP boot before attempting to run your first example
code. This can be achieved by pressing and holding down one of the ISP buttons while
pressing and releasing the reset button.

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3.2.2 Installation steps to use Keil and IAR tools
1. Download and install LPCScrypt or the Windows drivers for LPCXpresso boards
(http://www.nxp.com/lpcutilities). This will install required drivers for the board.
2. Ensure JP5 is open to force the Link2 debug probe to boot from internal flash.
3. Ensure jumper JP2 is fitted in position 1-2 (local target powered), and JP1 is not
installed (target SWD enabled). These are the default positions set during board
manufacture.
4. Connect the LPCXpresso546xx board to the USB port of your host computer,
connecting a micro USB cable to connector J8 (“USB Debug-Link”). The board will
boot and run the TouchGFX graphics demo.
5. Allow about 10 seconds for the LPCXpresso546xx devices to enumerate for the first
time. It is not necessary to check the Hardware Manager, however if this is done
there will be five devices; four under Human Interface Devices (CMSIS-DAP, LPC-
SIO, two HID Compliant Devices, and a USB Input Device) and one under Ports
(LPC-LinkII Ucom.)
6. Run either the “Program LPC-Link2 with CMSIS-DAP” or “Program LPC-Link2 with
SEGGER J-link” script provided in your LPCScrypt installation, and follow the on-
screen instructions. These scripts can be seen in the Windows Start menu for the
LPCScrypt installation.
7. After the script has run, remove JP5 and power cycle the board (note that resetting
the board does not reset the Link2, so power cycling is required).
8. Your board is now ready to use with your 3rd party tool. Follow the instructions for
those tools for using a CMSIS-DAP probe.
When the board is used for the first time, it is recommended to force the LPC546xx target
into known state by performing an ISP boot before attempting to run your first example
code. This can be achieved by pressing and holding down one of the ISP buttons while
pressing and releasing the reset button.
3.3 Starting a debug session using an external debug probe
Code running on the LPC546xx target can be debugged using an external debug probe
that conforms to the standard ARM debug connector. To use an external debug probe
connect the probe to the SWD connector (P1) and connect power via the micro USB
connector J1.
Note: The Debug link connector J8 must be left unconnected so that the Link2 debug
probe is left unpowered and does not contend with the SWD interface signals from the
external debug probe.
4. Link2 debug features
This section describes the features provided by the on-board Link2 debug probe. See the
Getting Started section for more information on how to program the device.
The Link2 debug probe is implemented using an LPC432x MCU (circuit reference U21),
which provides a high speed USB port interface to the host computer that runs the

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development tools. This device is not intended for developer use, and should only be
used with approved firmware images from NXP. The Link2 on-chip flash memory is
factory programmed with a firmware image that supports CMSIS-DAP debug protocol,
but also includes several other USB end point functions:
Virtual COM (VCOM) port: a serial device that can be used with any host computer
application design for serial port communication (e.g. Teraterm, puTTY, etc.)
SWO trace end point: this virtual device is used by MCUXpresso to retrieve SWO
trace data. See the MCUXpresso IDE documentation for more information.
Power measurement probe: this virtual device is used by MCUXpresso to retrieve
power measurement data from boards that support this feature (e.g. LPCXpresso V3
boards, including the LPCXpresso546xx.) See Section 7 for more details on this
feature.
I2S/SPI bridges: bridge device from I2C and SPI ports of the LPC546xx target.
All of these devices are independent of each other and of the CMSIS-DAP debug device
that is enumerated when the board is connected to a host computer; for example the
VCOM port can be used if the board is running an application when no debugger is
running.
In order to correctly install and use the Link2 device on the LPCXpresso546xx (required
for any debugging purpose) for Windows host computers, install the drivers first. These
drivers will automatically be installed when MCUXpresso IDE has already been installed.
If these IDEs are not being used, it is recommended LPCScrypt be installed as this also
includes the required drivers. All these tools and utilities are available for free download
at www.nxp.com.
The CMSIS-DAP firmware image installed at the factory (and by LPCScrypt) will uniquely
identify itself to the host computer so that more than one board can be connected to that
host computer at any time. Some toolchains cannot discern between multiple debug
devices; refer to your toolchain documentation for more information (note the
MCUXpresso does support multiple LPCXpresso board targets.)
Note: The Link2 only boots when the board is power cycled; the reset button on the
board does not reset the Link2.
When using MCUXpresso IDE, the Link2 can be automatically booted with the latest /
most appropriate firmware for that IDE version by installing JP5 before powering up the
board. This is the recommended approach for the MCUXpresso IDE. Note that if JP5 is
installed the VCOM port (and other devices mentioned above) device will not appear until
the IDE boots the debug probe. The debug probe is booted once a debug session is
started (that is, the IDE attempts to download code to the target).
4.1 What the Link2 boot LED indicates
LED D10 is the Link2 MCU BOOT0_LED indicator. This LED reflects the state of Link2
MCU pin P1_1. When the boot process fails, D1 will toggle at a 1 Hz rate for 60
seconds. After 60 seconds, the Link2 MCU is reset.

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4.2 Programming the Link2 firmware
As mentioned earlier in this section, it is not normally necessary to program the Link2
firmware. However this can easily be accomplished using the supporting utility,
LPCScrypt.
To program the Link2 Flash the Link2 device (LPC432x) must be in DFU mode. If the
Link2 already has a valid image in the flash, it will need to be forced into DFU mode by
placing a jumper shunt on JP5, and power cycling (disconnecting then reconnecting
power via J8.) Link2 MCU programming is performed using the LPCScrypt utility (see
http://www.nxp.com/lpcutilities). Instructions for using the tool are located at the same
web page.
4.3 VCOM port
The identifier of the VCOM port will vary between boards and hosts. To determine the
COM port, open the Windows operating system Device Manager. This can be achieved
by going to the Windows operating system Start menu and typing “Device Manager” in
the search bar. In the device manager look under “Ports”; the LPC-LinkII UCom Port
device and its name should be visible.
Fig 4. Identifying the VCOM port
4.4 Configuring the LPCXpresso546xx to debug an external target
The LPCXpresso546xx board’s Link2 debug probe may be used to debug an off-board
target MCU. The on-board Link2 debug probe is capable of debugging target MCU’s
with a VDDIO range of 1.6V to 3.6V. To keep the on-board target LPC546xx MCU from
interfering with the SWD interface, JP1 must be fitted. The Link2 debug probe SWD
should be connected by a ribbon cable between the P1 connector to the off-board target
MCU SWD interface. Power the LPCXpresso546xx board from the Link USB connector
J8, and fit jumper JP2 across pins 2 - 3 (External Target).
5. Board power connections & measurement
The LPCXpresso546xx board requires +5V input to power the on-board voltage
regulators which in turn power the Link2 debug probe and other +3.3V circuits, the
LPC546xx target and other +1.8V circuits, and the Arduino +5V and +3.3V power rails.
When the main external power source is from the Link2 side USB micro B-type connector
(J8), both the Link side and LPC546xx Target sections of the board are powered. When

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the main external power is from the power only USB micro B-type connector (J1), or one
of more of the USB device ports (USB0 at J3 or USB1 at J2), only the LPC546xx target
and supporting devices and peripherals are powered.
5.1 LPCXpresso546xx current measurement
The LPC546xx current can be measured by measuring the voltage across a sense
resistor in series with the supply, a current meter or using the on board current
measurement circuit. Each of these methods will be described in subsections below.
There is no current monitoring of the Link2 section circuits on the board. The Target side
power going to LEDs and support ICs is not monitored by the current measurement
circuit. The LPC546xx LQFP package has the core and IO power both sourced from the
same VDD pins.
When a shield board is attached, attempting to measure the lowest possible power the
LPC546xx IO pins must be configured according to how the software has configured the
shield board to ensure there is no extra current from the LPC546xx IO ports that have
external pull-up or pull-down resistors enabled.
There are several leakage paths through the various devices on the LPCXpresso546xx
board, so this board should not be used to measure the lowest possible leakage current
achievable in a target application.
5.1.1 LPC546xx Vsense resistor current measurement
The voltage across a pair of 1Ω resistors in series with the target LPC546xx VDD can be
manually measured at JP4 across pins 1 and 4 on the PCB. For a higher range of current
a jumper should be installed between pins 3 and 4 of JP4 to short out on of these
resistors. The voltmeter positive probe is applied to JP4 pin 1 (see silkscreen labelling)
and pin 4. Use Ohm’s law to calculate the current (LPC546xx current = measured
voltage / 2 Ω). As an example, if the measured voltage is 20 mV, then 20e-3 / 2 Ω = 10
mA.
Note: The input current to the MAX9634 used in the on-board current measurement will
be included in the voltage measured across this resistor.
5.1.2 LPC546xx VDD current measurement using a current meter
A current meter may be inserted at JP4 between pins 5 and 6 to measure the LPC546xx
VDD input current. Note that a jumper needs to be installed in the 5-6 position when an
ammeter is not present so power can reach the LPC546xx target.
5.1.3 LPC546xx VDD current measurement
The LPCXpresso546xx board has an on-board current measurement circuit consisting of
a MAX9634T (U18) current monitor chip and a 12-bit ADC (ADC122S021, U23) with a
12-bit sample at 50k to 200ksps. The on-board MAX9634T current monitor measures the
voltage across the LPC546xx VDD Vsense resistors; either 2 Ω or 1 Ω if JP4 jumper 3-4
is installed. The MAX9634 multiplies the sense voltage by 25 to provide a voltage range
suitable for the ADC to measure. A 2-input analog mux selects between the LPC546xx
current monitor and the output off a MAX9634T current monitor chip on an expansion
board (with compatible current measurement circuit on-board). The current
measurement circuit is controlled by the Link2 processor and is not user programmable.
Power measurement utilities to use this feature are available in LPCXpresso and IDE
MCUXpresso IDE installations.

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Due to input offset voltage variations in the MAX9634, the current measurement circuit is
not recommended for measuring current below 150 uA. See Fig 5 as a guideline for
measurement error versus measured current.
Fig 5. Current measurement circuit error
5.1.4 Shield board current measurement
To use the on-board current measurement circuitry, any expansion board must match the
functionality of the LPCXpresso546xx. Refer to the board schematics for more
information.
6. Board peripheral connections
6.1 LPC546xx USART ports and VCOM support
The LPCXpresso546xx board provides access to USART connections from Flexcomm4
at the expansion connector J13.
On LPC546xx the USART from Flexcomm0 supports ISP UART mode booting, and is
used by default for semi-hosting debug messages. This USART is connected to a serial
% Error
LPC546xx current (µA)

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port on the Link2 debug probe, which provides a bridging function to USB to a virtual com
port (or “VCOM” port) on a host computer connected to the debug link connector, J8. On
revision C boards TXD and RXD from this USART are also available at header P4, for an
external serial connection to be made. When using the P4 connector, JP6 must be
installed; note that when JP6 is installed the VCOM port functionality is disabled.
The factory default CMSIS-DAP Link2 image includes UART bridge functionality (VCOM
support), and this firmware is also available with the LPCScrypt utility, available at
http://www.nxp.com/lpcutilities. The J-Link firmware image available from LPCScrypt
(version 1.9 onwards) or directly from SEGGER also has this feature.
6.1.1 P3 USART header
The P4 header is designed to be used with an external serial to USB or other 3.3V serial
device. P4 is only present on Revision C boards. Table 3 shows the pin out information.
below. Note that the connections at P4 are made directly to the LPC4608 device, so care
should be taken to avoid ESD discharge and voltages outside the ratings of the device
I/O pins.
Table 3. P4 connections
Pin
Function
1
Ground
2
RXD (from LPC546xx)
3
TXD (from LPC546xx)
6.2 USB ports
The LPCXpresso546xx incorporates connectors for the two USB ports of the LPC546xx
device –a full speed (USB0) and a high speed port (USB1). Both of these USB ports
support device and host functionality, but only one can be used as a host port at any
given time. Jumper settings must be set appropriately for host mode selection, as
described in this section.
The MCUXpresso SDK for LPC546xx includes USB stacks for both host and device, with
several supporting application examples.
6.2.1 USB full-speed port (USB0)
The LPC546xx Full Speed (FS) USB port is connected to micro AB USB connector J3.
This section describes functionality support by this board and associated jumper settings
for this board.
6.2.1.1 Mass Storage Boot (MSC)
The FS USB port supports mass storage boot mode (also known as MSC). When the
board is booted in this mode using the FS port, the device will enumerate in a host
computer (when that computer is connected using a standard micro B USB cable via J3)
as a mass storage class device called CRP_DISABLED. To force the board to boot into
this mode press and hold down the ISP1 button while pressing and releasing the reset
button (or power cycling the board). See Section 3.1 for further information on how to use
this mode.

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6.2.1.2 Device mode
The FS port supports USB device mode operation; no jumper settings are needed to
configure this mode. When using the port in device mode, a standard micro USB cable
can be used.
6.2.1.3 Host mode
The FS port supports USB device mode operation but, due to sharing of some signals
and power supply circuitry, requires the following settings:
Connect external +5V power via USB connector J1. This is required for the FS USB
port to be able to power the devices connected to it.
Install JP10
For each of JP9, JP11, JP12, JP13 install a jumper in position 2-3.
Use of a micro AB adaptor to connect an external USB device may be required, as
most USB device have either a type A or micro B connector.
Note: The Ethernet and HS USB Host functions are disabled when the board is
configured for FS USB Host operation. Also note that Expansion connector port PIO4-7
is no longer available when using this mode.
6.2.2 USB High Speed port (USB1)
The LPC546xx High Speed (HS) USB port is connected to micro AB USB connector J2.
This section describes functionality support by this board and associated jumper settings
for this board.
6.2.2.1 Mass Storage Boot (MSC)
The HS USB port supports mass storage boot mode (also known as MSC). When the
board is booted in this mode using the HS port, the device will enumerate in a host
computer (when that computer is connected using a standard micro B USB cable via J2)
as a mass storage class device called CRP_DISABLED. To force the board to boot into
this mode press and hold down the ISP2 button while pressing and releasing the reset
button (or power cycling the board). See Section 3.1 for further information on how to use
this mode.
6.2.2.2 Host mode
The HS port supports USB device mode operation but, due to sharing of some signals
and power supply circuitry with the FS port, requires the following settings:
Connect external +5V power via USB connector J1. This is required for the HS USB
port to be able to power the devices connected to it.
Ensure JP10 is not installed (default).
Install a jumper at JP9 in position 1-2 (default).
Use of a micro AB adaptor to connect an external USB device may be required, as
most USB device have either a type A or micro B connector.
(Note: Although not required for the HS USB port operation, it is recommended to check
JP11, JP12 and JP13 have a jumper in position 1-2 to enable Ethernet operation and
availability of the I/O at the Expansion connector D8.)

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6.3 Host Expansion Header (J14)
This header provides connectivity from the LPC546xx target to a remote Host,
peripherals or other devices. Table 4 shows the connections.
Table 4. Host Expansion Header signals
Pin
J14 signal
Flexcomm # / Port
1
GPIO/SPI-SSEL in/out
3 / PIO0-1
2
GPIO/SPI-MOSI in/out
3 / PIO0-3
3
GPIO/SPI-MISO out/in
3 / PIO0-2
4
GPIO/SPI-SCK in/out
3 / PIO0-0
5
GND
6
VDD (3.3V)
7
GPIO/INT (out/in)
PIO0-5 (default) or PIO0-4, set by JS32
8
GPIO/RESET (out)
PIO3-13
9
SCL
1 / PIO0-14
10
SDA
1 / PIO0-13
11
GND
12
VDD (3.3V)
This connector shares SPI interface signal connections with the SPI bridge function (i.e.
connection from the LPC546xx to the Link2 debug probe); only one of these functions
may be used at once. By default jumper JP6 is open, connection the Flexcomm 3 SPI
port to the Link2 device; install JP6 if using the SPI port on J14.
By default, solder jumpers JS15 and JS16 connect the LPC546xx Flexcomm 1 I2C port to
the Link2 device; these may be removed if they will interfere with other devices interfaced
to J14. Note there are 2.2KΩ pull-up resistors to 3.3V for these SDA and SCL
connections.
6.4 PMod Slave Expansion Header
This header provides connectivity from the LPC546xx target to PMod peripherals or other
devices. Table 5 shows the connections.
Table 5. PMod Slave Expansion Header signals
Pin
PMod standard connection
J11 signal
Flexcomm # / Port
1
GPIO/SPI-SSEL out / UART CTS in
GPIO/SPI-SSEL in/out
9 / PIO4-6 (default) or
PIO3-30, set by JS27
2
GPIO/SPI-MOSI out / UART TXD out
GPIO/SPI-MOSI in/out
9 / PIO3-21
3
GPIO/SPI-MISO in / UART RXD in
GPIO/SPI-MISO out/in
9 / PIO3-22
4
GPIO/SPI-SCK out / UART RTS out
GPIO/SPI-SCK in/out
9 / PIO3-20
5
GND
GND
6
VCC (3.3V)
VDD (3.3V)
7
GPIO/INT in
GPIO/INT (out/in)
PIO2-0