UM11080
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© NXP B.V. 2017. All rights reserved.
User Manual
Rev. 1.0 — 27 November 2017
5 of 12
NXP Semiconductors
LPC845 Capacitive Touch Kit
User Manual
P2
Power measurement point. Connect a voltmeter across P2 to measure
voltage drop across a 2.43 ohm resistor connected in-line with the supply
to the LPC845 device.
P4
External supply voltage connection. An external power supply may be
used by connecting it to P4; pin 1 should be connected to pin 1 and
ground to pin 2. A 5V nominal supply should be used.
n/a
P5
LPC11U35 Device Firmware Update (DFU) mode enable. Install P5
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.)
P6
Inserting a jumper on JP1 holds the LPC11U35 debug probe in reset.
Install JP1 when using an external debug probe.
P7
Once R35 has been removed, P7 can be used to connect/disconnect the
LPC845 UART TX from the LPC11U35 debug probe (VCOMM
connection).
n/a
P8
Once R39 has been removed, P6 can be used to connect/disconnect the
LPC845 UART RX from the LPC11U35 debug probe (VCOMM
connection).
n/a
P9
Sensor board connector. The RWS, BM or other custom sensor board
connect to the MP via this connector.
P10
Connects CAPT_YH signal (PIO1_9) to the comparator input 5
(PIO0_30). Should be installed for normal use.
n/a
P11
Ammeter connection. After removal of R53, an ammeter can be installed
between the pins of JP2 to measure current flow to the LPC845. Once
R53 has been removed, P11 must either be installed or an ammeter in
place in order for the LPC845 to be powered.
Table 1.
Jumpers and connectors
Circuit reference
Description
Reference section