NXP Semiconductors
UM10946
LPCXpresso board for LPC4367/43S67/18S37 family of MCUs
UM10946
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 1.0
— 18 November 2015
7 of 19
Designator
Description
Reference section
Jumper shunted to force the Link2 to DFU boot mode.
Use this setting to reprogram the Link2 internal flash with
a new image or to use the LPCXpresso IDE with Redlink
protocol.
JP7, JP9
The on-board current measurement circuitry includes a
choice of two sense resistors for both the Target and I/O
supplies in order to enable more accurate current
measurement when the Target MCU is running in low
power modes. JP7 and JP9 are used to select short a
second sense resistor in the path of the current supplies
of the Target and I/O supplies respectively.
5.1.3
JP8, JP10 A current meter may be installed across JP8 terminals to
measure the Target MCU core current consumption. Pin
1 (square pad) is positive and pin 2 is negative. By
default JP5 is shunted by a 0Ω resistor installed at JS7.
Remove the resistor at JS7 to measure current at JP8.
A current meter may be installed across JP10 terminals
to measure the Target MCU I/O current consumption. Pin
1 (square pad) is positive and pin 2 is negative. By
default JP7 is shunted by
a 0Ω resistor installed at JS15.
Remove the resistor at JS15 to measure current at JP7.
5.1.2
P1
10-pin SWD connector
– The SWD connector is used to
debug the Target MCU from an external debug probe.
The same SWD connector can also be used to connect
the on-board Link2 debug probe to an off-board Target
MCU (for this JP1 must shunted 2
–3, and JP2 must have
a shunt installed).
6
P2, P3
A voltmeter installed across P2 terminals may be used to
measure the voltage across a sense resistor (R66, 200
mohm) in order to determine current flow into the target
MCU. Pin 1 (square pad) is positive and pin 2 is negative.
Similarly, the current flow into the I/O supply of the Target
MCU may be determined by measuring the voltage drop
across a 3 ohm sense resistor (R77) via the P3 terminals.
5.1.1
P4
FTDI serial header. In addition to provide a serial output
from Target MCU, the Target side of the board can be
powered from the FTDI header.
CAUTION: Users must make sure the GND side of the
FTDI cable is connected to PIN1, connecting it in the
reverse might damage the MCU.
4.1
SW1
Target MCU WAKEUP pushbutton. When pressed the
WAKEUP switch will drive Target MCU WAKEUP0 to a
low level, and will wake the part from various
SLEEP/POWER_DOWN modes.
8.3
SW2
Target MCU ISP Bootload enable pushbutton. This
switch drives Target MCU P2_7 low. Holding SW2
pressed while powering up or reseting and the Target
MCU will skip the image in internal flash and proceed
with booting based on JP3 settings..
8.2