UM11080
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User Manual
Rev. 1.0 — 27 November 2017
8 of 12
NXP Semiconductors
LPC845 Capacitive Touch Kit
User Manual
The CMSIS, DISK and COMM LEDs are connected to the LPC11U35 device. The
behavior of the LEDs will vary depending on firmware used, typically the CMSIS LED will
blink when debug communication is occurring, and the COMM LED will blink when data is
being transferred over the VCOMM port.
The board design includes pads for an external debug probe to be connected to the
LPC11U35 (connector J5). This connector is not installed, and is not intended for
customer use.
4.1 Using an external debug probe
An external debug probe that supports ARM’s SWD interface, such as a SEGGER J-Link
or PE Micro probe, can be used with the MP board. The external probe must be
connected to header J3. When an external debug probe is used, the on-board probe must
be held in reset by placing a jumper on P6. It is recommended that P6 is fitted before
powering the board.
5. Sensor Board Connection
The BM and RWS board connect to the MP board via a 2 x 13 right-angled connector
(circuit reference P9 on the MP board.) This connector provides all the capacitive touch
signals plus power, ground and GPIO signals to drive the LEDs. It is recommended that
power be removed before connecting / disconnecting the boards.
Custom designed sensor boards may be used with the MP board. Refer to the LPC84x
User Manual and the application note AN12083. for further information on sensor design
and associated software development. The pin connections for P9 are shown in
below.