UM11057
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© NXP B.V. 2017. All rights reserved.
User Manual
Rev. 1.0 — 9 June 2017
4 of 14
NXP Semiconductors
UM11057
User Manual
2. Board
Layout
Figure 2
below shows the layout of the LPCXpresso845MAX board, indicating location of
jumpers, buttons, connectors/expansion options and MCU devices.
Table 1
shows the layout of the LPCXpresso845MAX board, indicating location of
jumpers, buttons, connectors/expansion options and MCU devices.
Fig 2.
Board layout (top silkscreen)
Table 1.
Jumpers and connectors
Circuit reference
Description
Reference section
JP1
Inserting a jumper on JP1 holds the LPC11U35 debug probe in reset.
Install JP1 when using an external debug probe.
Section 4.1
JP2
Ammeter connection. After removal of SJ6, an ammeter can be installed
between the pins of JP2 to measure current flow to the LPC845. Once
SJ6 has been removed, JP2 must either be installed or an ammeter in
place in order for the LPC845 to be powered.
Section 6
JP3
LPC11U35 Device Firmware Update (DFU) mode enable. Install JP3
before powering up the board via USB in order to place the LPC11U35 in
DFU mode (thus enabling software update via drag and drop
programming on a host computer.)
Section 3.1
P1
Power measurement point. Connect a voltmeter across P1 to measure
voltage drop across a 2.43 ohm resistor connected in-line with the supply
to the LPC845 device.
Section 6
P2
VREFP/VREFN header connection. By default, VREFP of the LPC845 is
connected to the 3.3V regulator output, and VREFN to ground. By
removing connection 1-2 on SJ9 and bridging pads 2-3 instead, VREFP
can be injected via pin 1 of header P2. By removing connection 1-2 on
SJ8 and bridging pads 2-3 instead, VREFN can be injected via pin 3 of
header P2.
n/a
