LPC845 Capacitive Touch Kit
User Manual
User Manual for LPC845 Development Kit
Rev. 1.0 — 27 November 2017
User Manual
Document information
Info
Keywords
Abstract
Content
LPC845, OM40004, LPC845, LPC844, UM11080
LPC845 Capacitive Touch Kit User Manual
NXP Semiconductors
LPC845 Capacitive Touch Kit
User Manual
Revision history
Rev
1.0
Date
20171115
Description
First draft
Contact information
For more information, please visit:
http://www.nxp.com
For sales office addresses, please send an email to:
salesaddresses@nxp.com
UM11080
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2017. All rights reserved.
User Manual
Rev. 1.0 — 27 November 2017
2 of 12
NXP Semiconductors
LPC845 Capacitive Touch Kit
User Manual
1. Introduction
The LPC845 Capacitive Touch Kit enables easy evaluation of the capacitive touch
features of the LPC84x family of devices. The Kit can be used with a range of
development tools, including the MCUXpresso IDE, IAR EWARM and Keil MDK.
Fig 1.
LPC845 Capacitive Touch Kit boards
The LPC845 Capacitive Touch Kit board includes the following features:
•
Compatible with MCUXpresso IDE and other popular toolchains (incl. IAR and Keil)
•
On-board CMSIS-DAP (debug probe) with VCOM port, based on LPC11U35 MCU
•
LPC845 Main Processor (MP) Board, compatible with LPCXpresso845MAX board
(for common features), for easy code porting/sharing
•
•
•
•
•
•
•
Rotary wheel and slider (RWS) sensor board
9 button matrix (BM) sensor board
Debug connector to allow debug of target MCU using an external probe
LEDs on sensor boards for each capacitive touch pad
Target ISP and User/Wake buttons
Target Reset button
DAC output via speaker driver and speaker
2. Board Layout
Figure 2
below shows the layout of the MP board, indicating location of jumpers, buttons,
connectors/expansion options and MCU devices.
UM11080
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2017. All rights reserved.
User Manual
Rev. 1.0 — 27 November 2017
3 of 12
NXP Semiconductors
LPC845 Capacitive Touch Kit
User Manual
J4
P4
S1
RESET
P6
D1
S3
ISP
S2
WAKE
J3
D9
D10
D8
P8
P5
P1
P3
P2
P11
P7
P9
P10
Fig 2.
MP board layout (top silkscreen)
Table 1
below shows the layout of the MP board, indicating location of jumpers, buttons,
connectors/expansion options and MCU devices.
Table 1.
J3
J4
J5
P1
Jumpers and connectors
Description
External SWD debug connector for LPC845
USB connector for debug probe / board power
External SWD debug connector for LPC11U35 (not installed, would be
mounted on underside of PCB.)
Reference section
[4.1]
[4]
[4]
Circuit reference
P1 is not normally installed during production. After removing R6 (which is n/a
a zero ohm resistor in parallel with P1), the VDD supply to the LPC845
can be isolated from that to other devices on the board.
UM11080
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2017. All rights reserved.
User Manual
Rev. 1.0 — 27 November 2017
4 of 12
NXP Semiconductors
LPC845 Capacitive Touch Kit
User Manual
Table 1.
P2
Jumpers and connectors
Description
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.
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.
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.)
Inserting a jumper on JP1 holds the LPC11U35 debug probe in reset.
Install JP1 when using an external debug probe.
Reference section
[6]
Circuit reference
P4
n/a
P5
[3.1]
P6
P7
[4.1]
Once R35 has been removed, P7 can be used to connect/disconnect the n/a
LPC845 UART TX from the LPC11U35 debug probe (VCOMM
connection).
Once R39 has been removed, P6 can be used to connect/disconnect the n/a
LPC845 UART RX from the LPC11U35 debug probe (VCOMM
connection).
Sensor board connector. The RWS, BM or other custom sensor board
connect to the MP via this connector.
Connects CAPT_YH signal (PIO1_9) to the comparator input 5
(PIO0_30). Should be installed for normal use.
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.
[5]
P8
P9
P10
P11
n/a
[6]
UM11080
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2017. All rights reserved.
User Manual
Rev. 1.0 — 27 November 2017
5 of 12
京公网安备 11010802033920号
EEWORLD
