NXP Semiconductors LPC845 User Manual
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NXP Semiconductors LPC845 User Manual

Capacitive touch kit
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LPC845 Capacitive Touch Kit
User Manual
User Manual for LPC845 Development Kit
Rev. 1.0 — 27 November 2017
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Keywords
LPC845, OM40004, LPC845, LPC844, UM11080
Abstract
LPC845 Capacitive Touch Kit User Manual
User Manual

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  • Page 1 LPC845 Capacitive Touch Kit User Manual User Manual for LPC845 Development Kit Rev. 1.0 — 27 November 2017 User Manual Document information Info Content Keywords LPC845, OM40004, LPC845, LPC844, UM11080 Abstract LPC845 Capacitive Touch Kit User Manual...
  • Page 2 LPC845 Capacitive Touch Kit NXP Semiconductors User Manual Revision history Date Description 20171115 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.

  • Page 3: Introduction

    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.
  • Page 4 PCB.) P1 is not normally installed during production. After removing R6 (which is 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.
  • Page 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.

  • Page 6: Getting Started

    LPC845 Capacitive Touch Kit NXP Semiconductors User Manual 3. Getting Started The firmware for the on-board debug probe and Windows 7/8 driver for the virtual com (VCOM) port are available from http://nxp.com/demoboard/om40004 under the Software and Tools tab (look under “Software” download types). If using Window 7 or 8, you will need to install the VCOM driver by running the installer program (see installation notes included in the package.)

  • Page 7: Using Mp With 3Rd Party Ides

    The on-board LPC11U35 provides CMSIS-DAP debug probe functionality, plus a virtual comm port (VCOM) capability via PIO1_16 and PIO1_17 of the LPC845 target. This functionality bridges the LPC845 serial port via USB, so that PC applications such as the FreeMASTER utility (used to tune capacitive touch board designs) can communicate directly with the target.

  • Page 8: Using An External Debug Probe

    LPC845 Capacitive Touch Kit NXP Semiconductors 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.

  • Page 9: Power Measurement

    7.1 ISP booting and the ISP button The LPC845 can be forced into ISP boot mode by holding down the ISP button (S3) and then holding and releasing reset. The ISP button is connected via a 100 ohm resistor to LPC845 pin PIO0_12, which is also routed to the LPCXpresso expansion connector (pin 45) and to the cathode of the red user LED.

  • Page 10: Wake Button

    The Wake button (S2) is for general purpose use by LPC845 applications. It is connected via a 100 ohm resistor to a 100K ohm pull-up to 3.3V, and to the LPC845 PIO0_4 pin. This pin can wake the LPC845 from deep power-down.

  • Page 11: Legal Information

    Suitability for use — NXP Semiconductors products are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical systems or equipment, nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage.

  • Page 12: Table Of Contents

    LPC845 Capacitive Touch Kit NXP Semiconductors User Manual 9. Contents Introduction ......3 Power measurement .
  • Page 13 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: OM40004UL...

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