MICROCHIP PICDEM LCD 2 User Guide

PICDEM™ LCD 2

Demonstration Kit

User’s Guide

© 2007 Microchip Technology Inc. DS51662A

Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
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hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.

Trademarks

The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, K

EELOQ, KEELOQ logo, microID, MPLAB, PIC,

PICmicro, PICSTART, PRO MATE, PowerSmart, rfPIC, and
SmartShunt are registered trademarks of Microchip
Technology Incorporated in the U.S.A. and other countries.

AmpLab, FilterLab, Linear Active Thermistor, Migratable
Memory, MXDEV, MXLAB, PS logo, SEEVAL, SmartSensor
and The Embedded Control Solutions Company are
registered trademarks of Microchip Technology Incorporated
in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, ECAN,
ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, Mindi, MiWi,
MPASM, MPLAB Certified logo, MPLIB, MPLINK, PICkit,
PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal,
PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB,
rfPICDEM, Select Mode, Smart Serial, SmartTel, Total
Endurance, UNI/O, WiperLock and ZENA are trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.

SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.

All other trademarks mentioned herein are property of their
respective companies.

© 2007, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.

Printed on recycled paper.

Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona, Gresham, Oregon and Mountain View, California. The
Company’s quality system processes and procedures are for its PIC
MCUs and dsPIC® DSCs, KEEL
EEPROMs, microperipherals, nonvolatile memory and analog
products. In addition, Microchip’s quality system for the design and
manufacture of development systems is ISO 9001:2000 certified.

®

OQ

code hopping devices, Serial

DS51662A-page ii © 2007 Microchip Technology Inc.

®

PICDEM™ LCD 2 DEMONSTRATION

KIT USER’S GUIDE

Table of Contents

Preface ........................................................................................................................... 1

Chapter 1. Introduction

1.1 Welcome ........................................................................................................ 5

1.2 PICDEM LCD 2 Demonstration Board Hardware Features ........................... 6

1.3 Sample Devices ............................................................................................. 7

1.4 Sample Programs ........................................................................................... 7

Chapter 2. Getting Started

2.1 PICDEM LCD 2 as a Stand-Alone Board – Preprogrammed Device ............. 9

2.2 PICDEM LCD 2 Used with an In-Circuit Emulator or In-Circuit Debugger .... 10

Chapter 3. Using the Demo Software

3.1 Demo Firmware Operation ........................................................................... 11

Appendix A. Board Technical Information

A.1 Processors ................................................................................................... 19

A.2 LCD Display ................................................................................................. 20

A.3 LED Display ................................................................................................. 34

A.4 Charge Pump and V

A.5 Resistive Ladder Versus Charge Pump ....................................................... 34

A.6 Oscillator Options ......................................................................................... 35

A.7 RS-232 Serial Port ....................................................................................... 35

A.8 Real-Time Clock .......................................................................................... 35

A.9 Serial EEPROM ........................................................................................... 35

A.10 Analog Input ............................................................................................... 35

A.11 Temperature Sensor .................................................................................. 36

A.12 Switches ..................................................................................................... 36

A.13 ICD Connector ........................................................................................... 36

A.14 Power Supply ............................................................................................. 37

A.15 Board Layout and Schematics ................................................................... 40

A.16 PIM Layout and Schematics ...................................................................... 44

LCAP ............................................................................. 34

Worldwide Sales and Service .................................................................................... 52

© 2007 Microchip Technology Inc. DS51662A-page iii

PICDEM™ LCD 2 Demonstration Kit User’s Guide

NOTES:

DS51662A-page iv © 2007 Microchip Technology Inc.

© 2007 Microchip Technology Inc. DS51662A-page v

PICDEM™ LCD 2 DEMONSTRATION

KIT USER’S GUIDE

Preface

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and
documentation are constantly evolving to meet customer needs, so some actual dialogs
and/or tool descriptions may differ from those in this document. Please refer to our web site
(www.microchip.com) to obtain the latest documentation available.

Documents are identified with a “DS” number. This number is located on the bottom of each
page, in front of the page number. The numbering convention for the DS number is
“DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the
document.

For the most up-to-date information on development tools, see the MPLAB
Select the Help menu, and then Topics to open a list of available on-line help files.

The VL logo is a registered logo of Varitronix Limited. The illustrations on pages 20, 21,
25, 27, 30 and 33 are copyrighted materials of Varitronix and VL Electronics. Reprinted
with permission.

®

IDE on-line help.

INTRODUCTION

This chapter contains general information that will be useful to know before using the
PICDEM™ LCD 2 Demonstration Kit User’s Guide. Items discussed in this chapter
include:

• About this Guide

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Web Site

• Development Systems Customer Change Notification Service

• Customer Support

ABOUT THIS GUIDE

Document Layout

This document describes how to use the PICDEM LCD 2 as a development tool to
emulate and debug firmware on a target board. The manual layout is as follows:

• Chapter 1. Introduction – Describes the hardware of the PICDEM LCD 2
Demonstration Board.

• Chapter 2. Getting Started – Describes how to use the PICDEM LCD 2
Demonstration Board.

• Chapter 3. Using the Demo Software – Describes how to use the application in
Demo mode and also how it can be customized.

• Appendix A. Board Technical Information – Shows the schematic and layout
diagrams for the PICDEM LCD 2 Demonstration Board.

© 2007 Microchip Technology Inc. DS51662A-page 1

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books

Initial caps A window the Output window

Quotes A field name in a window or

Underlined, italic text with
right angle bracket

Bold characters A dialog button Click OK

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier font:

Plain Courier New Sample source code #define START

Italic Courier New A variable argument file.o, where file can be

0xnnnn A hexadecimal number where

Square brackets [ ] Optional arguments mcc18 [options] file

Curly brackets and pipe
character: { | }

Ellipses... Replaces repeated text var_name [,

Preface

PICDEM LCD 2 User’s Guide

Emphasized text ...is the

A dialog the Settings dialog
A menu selection select Enable Programmer

“Save project before build”

dialog
A menu path

A tab Click the Power tab

Filenames autoexec.bat

File paths c:\mcc18\h
Keywords _asm, _endasm, static

Command-line options -Opa+, -Opa-

Bit values 0, 1
A binary number ‘b00100, ‘b10

n is a hexadecimal digit

Choice of mutually exclusive
arguments; an OR selection

Represents code supplied by
user

File>Save

any valid filename
0xFFFF, 0x007A

[options]

errorlevel {0|1}

var_name...]

void main (void)
{...
}

only

compiler...

© 2007 Microchip Technology Inc. DS51662A-page 2

PICDEM™ LCD 2 Demonstration Kit User’s Guide

RECOMMENDED READING

This user’s guide describes how to use the PICDEM LCD 2 Demonstration Kit. Other
useful documents are listed below. The following Microchip documents are available
and recommended as supplemental reference resources.

Readme Files

For the latest information on using other tools, read the tool-specific Readme files in
the Readmes subdirectory of the MPLAB
contain update information and known issues that may not be included in this user’s
guide.

The following documents are comprehensive references for Microchip’s enhanced
microcontrollers with LCD driver:

“PIC18F85J90 Family Data Sheet”
“PIC18F6390/6490/8390/8490 Data Sheet”
“PIC16C9XX Data Sheet”
“PIC16C925/926 Data Sheet”
“PIC16F917/916/914/913 Data Sheet”

THE MICROCHIP WEB SITE

Microchip provides online support via our web site at www.microchip.com. This web
site is used as a means to make files and information easily available to customers.
Accessible by using your favorite Internet browser, the web site contains the following
information:

• Product Support – Data sheets and errata, application notes and sample
programs, design resources, user’s guides and hardware support documents,
latest software releases and archived software

• General Technical Support – Frequently Asked Questions (FAQs), technical
support requests, online discussion groups, Microchip consultant program
member listing

• Business of Microchip – Product selector and ordering guides, latest Microchip
press releases, listing of seminars and events, listings of Microchip sales offices,
distributors and factory representatives

(DS30444)

(DS39544)

®

IDE installation directory. The Readme files

(DS39770)

(DS39629)

(DS41250)

DS51662A-page 3 © 2007 Microchip Technology Inc.

Preface

DEVELOPMENT SYSTEMS CUSTOMER CHANGE NOTIFICATION SERVICE

Microchip’s customer notification service helps keep customers current on Microchip
products. Subscribers will receive e-mail notification whenever there are changes,
updates, revisions or errata related to a specified product family or development tool of
interest.

To register, access the Microchip web site at www.microchip.com, click on Customer
Change Notification and follow the registration instructions.

The Development Systems product group categories are:

• Compilers – The latest information on Microchip C compilers and other language
tools. These include the MPLAB C17, MPLAB C18 and MPLAB C30 C compilers;
MPASM™ and MPLAB ASM30 assemblers; MPLINK™ and MPLAB LINK30
object linkers; and MPLIB™ and MPLAB LIB30 object librarians.

• Emulators – The latest information on Microchip in-circuit emulators. This
includes the MPLAB ICE 2000 and MPLAB ICE 4000.

• In-Circuit Debuggers – The latest information on the Microchip in-circuit
debugger, MPLAB ICD 2.

• MPLAB IDE – The latest information on Microchip MPLAB IDE, the Windows
operating system Integrated Development Environment for development systems
tools. This list is focused on the MPLAB IDE, MPLAB SIM and MPLAB SIM30
simulators, MPLAB IDE Project Manager and general editing and debugging
features.

• Programmers – The latest information on Microchip programmers. These include
the MPLAB PM3 and PRO MATE
PICSTART

®

Plus development programmer.

®

II device programmers and the

®

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

• Development Systems Information Line

Customers should contact their distributor, representative or field application engineer
(FAE) for support. Local sales offices are also available to help customers. A listing of
sales offices and locations is included in the back of this document.

Technical support is available through the web site at:

http://support.microchip.com

In addition, there is a Development Systems Information Line which lists the latest
versions of Microchip’s development systems software products. This line also
provides information on how customers can receive currently available upgrade kits.

The Development Systems Information Line numbers are:

1-800-755-2345 – United States and most of Canada

1-480-792-7302 – Other International Locations

© 2007 Microchip Technology Inc. DS51662A-page 4

1.1 WELCOME

Thank you for purchasing the PICDEM LCD 2 Demonstration Kit from Microchip
Technology Incorporated. The PICDEM LCD 2 demonstrates the capabilities of the
PIC18FXXJ90, PIC18FXX90 and PIC16X9XX families of devices.

The PICDEM LCD 2 can be used stand-alone with a preprogrammed part, with an
in-circuit emulator (e.g., MPLAB
ICD 2). Sample programs are provided to demonstrate the unique features of the
supported devices.

The PICDEM LCD 2 Demonstration Kit comes with the following:

1. PICDEM LCD 2 Demonstration Board (Figure 1-1)

2. Sample Plug-in Module (PIM)

3. CD-ROM which contains:

If you are missing any part of the kit, please contact your nearest Microchip sales office
listed in the back of this publication for help.

PICDEM™ LCD 2 DEMONSTRATION

KIT USER’S GUIDE

Chapter 1. Introduction

®

ICE) or with an in-circuit debugger (e.g., MPLAB

• Sample Programs

•

“PICDEM™ LCD 2 Demonstration Kit User’s Guide”

© 2007 Microchip Technology Inc. DS51662A-page 5

1.2 PICDEM LCD 2 DEMONSTRATION BOARD HARDWARE FEATURES

The PICDEM LCD 2 Demonstration Board has the following hardware features; each
feature’s number corresponding to the number in Figure 1-1:

1. The demonstration board provides a daughter board option for the

PIC18F85J90, PIC18F8490, PIC16F914/917 and PIC16F946 families of devices
and MPLAB ICE. The board is also supplied with a PIM populated with a
PIC18F85J90 device.

Note: Optional PIMs populated with PIC18FXX90 and PIC16F9XX devices are

available for purchase from Microchip Direct (www.microchipdirect.com).

The MPLAB ICE can be plugged onto the board without any transition socket for
PIC18FXX90 devices. For other devices, a transition socket may be needed.

2. On-board adjustable voltage regulator for direct input from 9V, 100 mA AC/DC

wall adapter or 3V button cell battery.

3. Jumper J15 to select different power options.

4. Green power-on indicator LED for direct input from 9V.

5. Varitronix custom segmented LCD display.

6. Jumpers, COM0, COM1, COM2 and COM3, to disconnect COM pins from

on-board LCD and allow the usage of any customized LCD glass.

7. RS-232 connection and associated hardware for direct connection to RS-232

interface.

8. Jumpers, JP13 and JP14, to disconnect TX and RX.

9. In-Circuit Debugger (ICD) connector.

10. R44, 10 kΩ, potentiometer for devices with analog inputs.

11. Five push button switches (S1 through S5) for external stimulus and Reset.

12. Jumpers, JP19, JP18, JP1 and JP2, to disconnect switches from RB6, RB7, RA6

and RA7 input pins.

13. Jumper, J11, to select either 10 kΩ (POT R44) or the S1-S4 switches to AN0

(RA0).

14. Two green LEDs connected to RC3 and RC4 (device dependent).

15. Jumpers in J14 to disconnect LEDs from RC3 and RC4.

16. A slide switch (S6) to select either the resistor ladder or the charge pump option

for generating the bias values for the LCD pins.

17. Jumper, JP21, to physically tie the resistor ladder to ground.

18. Unpopulated holes provided for crystal connection.

19. Jumpers, JP11 and JP12, to disconnect crystal from OSC1 and OSC2.

20. 32.768 kHz crystal with Timer1 for Real-Time Clock (RTC) operation.

21. A Microwire EEPROM 93AA46C provided on a socket.

22. Jumpers, JP15 and JP16, to disconnect EEPROM from CK and DT. Jumper, J6,

to connect CS to GND or to RC4 (device dependent). Jumper, J13, to select
either 128 x 8 or 64 x 16 memory organization.

23. Thermistor for sensing temperature.

24. Jumper, JP5, to connect thermistor to AN1 (RA1) (device dependent).

25. Jumper, JP17, to select either V

26. Unpopulated option for TC77 temperature sensor.

27. Prototype area for user hardware.

28. PICtail™ daughter board connection. (The pin names on the board are valid only

for the PIC18F8490 device. For other devices, the PICtail daughter board pin
connections may be different or not connected.)

CC or I/O to power the peripherals.

© 2007 Microchip Technology Inc. DS51662A-page 6

PICDEM™ LCD 2 Demonstration Kit User’s Guide

FIGURE 1-1: PICDEM™ LCD 2 HARDWARE

15

14

12

27

13

4

2

7

9

2

22

8

3

18 19 23

21 25 20

1

26

28

24

11

10

1.3 SAMPLE DEVICES

A PIM, populated with the PIC18F85J90, is included.

1.4 SAMPLE PROGRAMS

The PICDEM LCD 2 Demonstration Kit includes a CD-ROM with sample demonstration
programs. Depending on the device, these programs may be used with some of the
included sample devices with an In-Circuit Emulator (ICE) or with an In-Circuit
Debugger (ICD). For each type of device (PIC16F946, PIC16F917, PIC18F8490 and
PIC18F85J90), demo source code, several C and/or .asm files and compiled code
(one HEX file) are provided.

16

17

56

DS51662A-page 7 © 2007 Microchip Technology Inc.

NOTES:

© 2007 Microchip Technology Inc. DS51662A-page 8

PICDEM™ LCD 2 DEMONSTRATION

KIT USER’S GUIDE

Chapter 2. Getting Started

The PICDEM LCD 2 may be used as a stand-alone board with a preprogrammed
device, with an In-Circuit Emulator (ICE) or with an In-Circuit Debugger (ICD). For a list

®

of PIC

Development Systems Ordering Guide”

2.1 PICDEM LCD 2 AS A STAND-ALONE BOARD – PREPROGRAMMED DEVICE

The PICDEM LCD 2 may be demonstrated immediately by following the steps listed
below:

• Apply power to the PICDEM LCD 2. For information on acceptable power

microcontroller compatible ICEs or ICDs, please refer to the

(DS30177)

sources, see Appendix A. “Board Technical Information”.

Note: In the event that the preprogrammed PICDEM LCD 2 Demonstration Board

with the PIC18F85J90 PIM does not operate, check the following
conditions:

- The jumper, J15, is configured as per the power supply used. The slide
switch, S6, is switched to C.

- JP1, JP2, JP6, JP18 and JP19 are connected.

- The middle two jumpers of J14 are connected.

- JP9 and JP10 are connected.

- J11 connecting POT to AN0 and JP17 connecting V

The status of all other jumpers will not affect the preprogrammed
demonstration.

Refer to Figure A-1 in Appendix A. “Board Technical Information”.

.

“Microchip

CC to I/O.

To reprogram the sample device, the following will be necessary:

1. User source code may be programmed to the device or the sample program may
be restored from the file on the included CD-ROM.

2. An assembler, such as the MPASM™ Assembler (available with MPLAB IDE), or
a compiler, such as MPLAB C18 C Compiler (PIC18XXXX/18XXJXX devices
only) must be used.

Source code must be assembled or compiled into a HEX file before it can be
programmed into the device. Microchip Technology’s MPASM Assembler or
MPLAB C18 C Compiler may be used. Both are compatible with MPLAB IDE;
however, other assemblers/compilers may be used.

3. Once the sample program is in the HEX file format, it can be programmed to a
Flash device using an MPLAB ICD 2 or PM3 with an ICSP™ module. Microchip
Technology’s MPLAB ICD 2 is compatible with MPLAB IDE.

If the code protection bit(s) have not been programmed, the on-chip program
memory can be read out for verification purposes.

© 2007 Microchip Technology Inc. DS51662A-page 9

2.2 PICDEM LCD 2 USED WITH AN IN-CIRCUIT EMULATOR OR IN-CIRCUIT DEBUGGER

To use the PICDEM LCD 2 with an In-Circuit Emulator (ICE) or In-Circuit Debugger
(ICD), refer to the tool’s user’s guide for instructions on how to power-up and configure
the ICE/ICD, as well as how to connect to target boards.

Configure the PICDEM LCD 2 for the desired oscillator as described in Table 2-1. Refer
to the ICE/ICD user’s guide for any oscillator configuration requirements.

TABLE 2-1: OSCILLATOR SELECTION

Oscillator Selection on

PICDEM™ LCD 2

Crystal JP9 and JP10 not connected. No canned oscillator on board,

crystal in Y2, JP11 and JP12 connected, caps in C16 and C17.

Canned Oscillator Put canned oscillator on socket Y3. Y2 empty, JP9, JP11 and

JP12 not connected.

Device Internal Oscillator JP11 and JP12 not connected. No canned oscillator on board.
Ceramic Resonator – no

internal caps

Ceramic Resonator – with
internal caps

JP9 and JP10 not connected. No canned oscillator on board,
resonator in Y2, JP11 and JP12 connected, caps in C16 and
C17.

JP9 and JP10 not connected. No canned oscillator on board,
resonator in Y2, JP11 and JP12 connected, C16 and C17
empty.

Modification on PICDEM™ LCD 2

Note: The MPLAB ICE can be plugged onto the board without any transition

socket for PIC18FXX90 devices. For other devices, a transition socket may
be needed.

© 2007 Microchip Technology Inc. DS51662A-page 10

PICDEM™ LCD 2 DEMONSTRATION

Chapter 3. Using the Demo Software

The demo programs are preprogrammed into the sample devices. Also, this program
is included on the CD-ROM program disk for user reference. This demo program uses
the functions or macros provided by the firmware LCD driver module to display the
required characters, strings or icons on the LCD.

3.1 DEMO FIRMWARE OPERATION

The demo firmware is made up of four components, which are individually displayed on
the LCD. The PIC microcontroller’s internal RC oscillator is used as the system clock
source.

1. Voltmeter (F1)
This mode uses the A/D module to measure the voltage of the R44 pot through
analog channel AN0, and displays a voltage between 0.00V and 3.30V on the
LCD using the LCD module. Voltage is continually updated until the mode is
exited by pressing either the S1 or S2 switch.

2. Thermometer (F2)

This mode uses the A/D module to measure the voltage of the thermistor R11
through analog channel AN1, and converts to temperature both in Celsius and
Fahrenheit and displays the temperature on the LCD using the LCD module.
Temperature is continually updated until the mode is exited by pressing either the
S1 or S2 switch.

3. Clock (F3)

This mode uses the Timer1 module and a 32 kHz clock crystal. Once this mode
is entered from the main menu, the Real-Time Clock will start counting from
00:00:00. The S3 switch is used to increment minutes and the S4 switch is used
to increment hours. To perform the increment operations, press and hold the
switches. The clock keeps running continuously until the mode is exited by
pressing either the S1 or S2 switch.

4. Charge Pump and Software Contrast (F4)
This mode is available only for the PIC18F85J90 family of devices and uses the
on-board charge pump and LCD voltage regulator. The LCD module is config­ured in Charge Pump mode and software contrast is achieved by either pressing
S3 to increase the contrast or S4 to decrease the contrast until the mode is exited
by pressing either the S1 or S2 switch. By exiting this mode, the Voltmeter mode
is entered and retains the contrast level.

(1)

KIT USER’S GUIDE

(1)

Note 1: For low-power battery operation in JP17, remove jumper on Vcc and I/O

and connect I/O and RB0.

© 2007 Microchip Technology Inc. DS51662A-page 11

FIGURE 3-1: DEMO PROGRAM FLOWCHART

Power-up

Display Microchip Logo

Display Varitronix Logo

Sleep

A

Voltmeter Demo

Display F1

Start A/D

Conversion on

Channel AN0

Wake-up from Sleep

by Pressing either S1 or S2

Sleep

Display the Voltage

Is S1/S2

switch pressed?

No

Wake-up from Sleep

on Completion of Conversion

Yes

B

© 2007 Microchip Technology Inc. DS51662A-page 12

PICDEM™ LCD 2 Demonstration Kit User’s Guide

FIGURE 3-2: DEMO PROGRAM FLOWCHART

B

Thermometer Demo

Display F2

Start A2D

Conversion on

Channel AN1

Sleep

Display the Temperature

Is S1/S2

switch pressed?

No

Wake-up from Sleep

on Completion of Conversion

Yes

C

DS51662A-page 13 © 2007 Microchip Technology Inc.

FIGURE 3-3: DEMO PROGRAM FLOWCHART

C

Real-Time Clock Demo

Display F3

Is S1/S2

switch pressed?

No

Display Time

Sleep

Is S3

switch pressed?

No

Is S4

switch pressed?

No

Yes

Yes

Yes

D

Wake-up from Sleep

Every Second

Increment

Minute

Increment

Hour

© 2007 Microchip Technology Inc. DS51662A-page 14

PICDEM™ LCD 2 Demonstration Kit User’s Guide

FIGURE 3-4: DEMO PROGRAM FLOWCHART

D

Software Contrast Demo

using Charge Pump

Display F4

Is S1/S2

switch pressed?

No

Display

LCDREG<BIAS> bits

Is S3

switch pressed?

No

Is S4

switch pressed?

No

Yes

Yes

Yes

A

Increase
Contrast

Decrease

Contrast

DS51662A-page 15 © 2007 Microchip Technology Inc.

FIGURE 3-5: DEMO PROGRAM FLOWCHART

ISR

Increment Second Register

Is it 60?

Yes

Clear Second

Register,

Increment Minute

Register

Is it 60?

Yes

Clear Minute

Register,

Increment Hour

Register

Is it 24?

Yes

No

No

No

Clear Hour Register

Return

© 2007 Microchip Technology Inc. DS51662A-page 16

PICDEM™ LCD 2 DEMONSTRATION

KIT USER’S GUIDE

Appendix A. Board Technical Information

The PICDEM LCD 2 hardware is not complicated and is intended to illustrate the ease
of use of various PIC
hardware elements.

Note: Many of the following hardware sections will require specific demo board

jumper configurations. If a jumper is not listed in a particular section, then
that jumper has no effect on the circuitry within the hardware section you
are working. Figure A-1 shows a diagram of the PICDEM LCD 2 silkscreen
with all necessary jumpers highlighted in gray. Also, refer to the schematic
for circuit connections.

®

microcontrollers. The PICDEM LCD 2 features the following

© 2007 Microchip Technology Inc. DS51662A-page 17

FIGURE A-1: PICDEM™ LCD 2 DEFAULT JUMPER LOCATION

© 2007 Microchip Technology Inc. DS51662A-page 18

PICDEM™ LCD 2 Demonstration Kit User’s Guide

A.1 PROCESSORS

While there is no actual processor populated on the board, a processor is provided with
the plug-in module (PIM) that is shipped with the demonstration board. The default
processor on the PIM is the PIC18F85J90.

The board also supports the PIC18F8490, PIC16F946 and PIC16F917 processors,
which have been designed for use with the PICDEM LCD 2. These three processors
are in the PICDEM LCD 2 PIM Pack which is available for separate purchase.

The part numbers for a replacement PIC18F85J90 and the PIM pack are given in
Ta bl e A - 1.

TABLE A-1: PART NUMBERS

Item Part number

PICDEM LCD 2 PIM Pack

• PIC18F8490 PIM

• PIC16F946 PIM

• PIC16F917 PIM

PIC18F85J90 PIM MA180022

For the availability and pricing of parts, go to www.microchipdirect.com.

†

(†)

MA180019

DS51662A-page 19 © 2007 Microchip Technology Inc.

A.2 LCD DISPLAY

A custom made segmented LCD glass, manufactured by the Varitronix Corporation, is
provided as shown in Figure A-2. This LCD has 4 commons and 32 segments.
Table A-2 provides a few of the specifics for the display. Refer to the Varitronix
specification sheet (VL_5573_V00) for additional details.

FIGURE A-2: PICDEM™ LCD 2 DISPLAY

21

N.C.
COM2

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

SEG23

SEG24

SEG25

SEG26

SEG27

SEG28

SEG29

SEG30

SEG31

COM3

40

N.C.

Legend: N.C. = No connection

20

COM1

SEG15

SEG14

SEG13

SEG12

SEG11

SEG10

SEG9

SEG8

SEG7

SEG6

SEG5

SEG4

SEG3

SEG2

SEG1

SEG0

COM0

1

© VL Electronics

N.C.

N.C.

TABLE A-2: LCD GLASS SPECIFICATIONS

Type Specification

P.I.D. VL_5573_V00

Mode/Color/Type Positive / -- / TN

Viewing Direction 6:00 O’Clock
Driving Scheme 1/4 Duty, 1/3 Bias

Drive Voltage (VLCD) ~3.0 Volt (p-p), +20°C

Operating Temperature 0°C - +50°C
Storage Temperature -10°C - +60°C

Polarizer – Front STD.Transmissive

Polarizer – Back STD.Reflective

Since the glass used on the PICDEM LCD 2 operates at 3V, there is a voltage protec­tion circuit on the LCDBIAS3 pin, which is enabled in the default configuration. When
enabled, even if the V

DD is greater than 3V, it regulates the LCDBIAS3 voltage such

that it always maintains the value to 3V. This is not necessary for operation of the LCD
module, but it is a protection circuit to prevent accidentally applying voltages higher
than 3V to the LCD glass present on the board.

© 2007 Microchip Technology Inc. DS51662A-page 20

PICDEM™ LCD 2 Demonstration Kit User’s Guide

FIGURE A-3: DISPLAY DEFINITIONS

FIGURE A-4: DIGIT DESCRIPTION

© VL Electronics

© VL Electronics

DS51662A-page 21 © 2007 Microchip Technology Inc.

TABLE A-3: LCD SEGX AND COMX

Pin ICE Pin COM0 COM1 COM2 COM3

1 N.C. N.C. N.C. N.C.

2COM0———
3 SEG0 S12 — — S10

4 SEG1 S11 — — —

5 SEG2 7D 7F 7A 7E
6 SEG3 DP2 7G 7B 7C

7 SEG4 8D 8F 8A 8E

8 SEG5 S13 8G 8B 8C
9 SEG6 X23 X25 X26 X24

10 SEG7 5B 5C — 5G

11 SEG8 5A 5E 5D 5F
12 SEG9 4B 4C DP1 4G

13 SEG10 4A 4E 4D 4F

14 SEG11 3B 3C — 3G
15 SEG12 — X22 X21 —

16 SEG13 X17 X19 X20 X18

17 SEG14 X16 X14 X13 X15
18 SEG15 X9 X11 X12 X10

19 — COM1 — —

20 N.C. N.C. N.C. N.C.
21 N.C. N.C. N.C. N.C.

22 — — COM2 —

23 SEG16 X8 X6 X5 X7
24 SEG17 X1 X3 X4 X2

25 SEG18 — F2 F1 F3

26 SEG19 1A 1E F4 1F
27 SEG20 1B 1C 1D 1G

28 SEG21 2A 2E 2D 2F

29 SEG22 2B 2C COL 2G
30 SEG23 3A 3E 3D 3F

31 SEG24 S9 6G 6B 6C

32 SEG25 6D 6F 6A 6E
33 SEG26 X31 X33 X34 X32

34 SEG27 — X27 X35 X30

35 SEG28 — X28 X36 X29
36 SEG29 S1 S3 S4 S2

37 SEG30 S6 — — S7

38 SEG31 S5 — — S8
39 — — — COM3

40 N.C. N.C. N.C. N.C.

Legend: N.C. = No connection

© 2007 Microchip Technology Inc. DS51662A-page 22

PICDEM™ LCD 2 Demonstration Kit User’s Guide

A.2.1 Device-Specific LCD Segment Configuration

The following figures and tables detail which segments are available for specific

®

PIC

devices.

TABLE A-4: PIC18F85J90 PIM AND ICE PIN/PORT COMPARISON

PIC18F85J90

PIM Pin No.

10 RG4 SEG26 SEG26 RG4 21 50 RA6 OSC2 OSC2 RA6 63

11 V

12

13 RF7 SEG25 SEG25 RF7 25 53

14 RF6 SEG24 SEG24 RF6 26 54 RB4 SEG11 SEG11 RB4 68

15 RF5 SEG23 SEG23 RF5 27 55 RB3 SEG10 SEG10 RB3 69

16 RF4 SEG22 SEG22 RF4 28 56 RB2 SEG9 SEG9 RB2 70

17 RF3 SEG21 SEG21 RF3 29 57 RB1 SEG8 SEG8 RB1 71

18 RF2 SEG20 SEG20 RF2 30 58 RB0 RB0 RB0 RB0 72

19 RH7 SEG43 SEG43 RH7 31 59 RJ3 SEG35 SEG35 RJ3 73

20 RH6 SEG42 SEG42 RH6 32 60 RJ2 SEG34 SEG34 RJ2 74

21 RH5 SEG41 SEG41 RH5 33 61 RJ1 SEG33 SEG33 RJ1 75

22 RH4 SEG40 SEG40 RH4 34 62 RJ0 NC NC

23 RF1 SEG19 SEG19 RF1 35 63 RD7 SEG7 SEG7 RD7 77

24

25 AV

26 AV

27 RA3 NC NC 67 RD3 SEG3 SEG3 RD3 81

28

29

30 RA0 AN0 AN0 RA0 42 70 V

31 V

32 V

33 RA5 SEG15 SEG15 RA5 46 73

34 RA4 SEG14 SEG14 RA4 47 74 RE6 COM3 COM3 RE6 5

35 RC1 T1OSCI T1OSCI RC1 48 75 RE5 COM2 COM2 RE5 6

36 RC0 T1OSCO T1OSCO RC0 49 76 RE4 COM1 COM1 RE4 7

37 RC6 TX/CK TX/CK RC6 50 77 RE3 COM0 COM0 COM0 8

38 RC7 RX/DT RX/DT RC7 51 78 RE2 BIAS3 BIAS3 RE2 9

39 RJ4 SEG39 SEG39 RJ4 52 79

40 RJ5 SEG38 SEG38 RJ5 53 80

Legend: Unshaded cells indicate where a perfect match between PIM and ICE pins and ports exists.

PIC18F85J90

Port

1 RH2 SEG45 SEG30 RG0 16 41 RJ6 SEG37 SEG37 RJ6 54

2

3 RE1 BIAS2 BIAS2 RE1 14 43 RC2 SEG13 SEG13 RC2 56

4 RE0 BIAS1 BIAS1 RE0 15 44

5

6 RG1 NC NC 46 RC5 SEG12 SEG12 RC5 59

7

8

9RG5MCLR

RH3 SEG44 SEG29 RG1 17 42 RJ7 SEG36 SEG36 RJ7 55

RG0 BIAS0 BIAS0 RB5 67 45 RC4 SEG16 SEG16 RA2 40

RG2 VLCAP1 VLCAP1 RC3 57 47 RB7 RB7 RB7 RB7 60

RG3 VLCAP2 VLCAP2 RC4 58 48 VDD ICEVDD ICEVDD VDD 61

VDDCORE VDDCORE VDD VDD 24 52 RB6 RB6 RB6 RB6 66

ENVREG ENVREG 64 RD6 SEG6 SEG6 RD6 78

RA2 AN2 AN1 RA1 41 68 RD2 SEG2 SEG2 RD2 82

RA1 SEG18 SEG18 RF0 36 69 RD1 SEG1 SEG1 RD1 83

Shaded cells indicate where differences between PIM and ICE ports and pins exist.

Bold text indicates the PIM pins that are not connected to any ICE pins or ports.

PIC18F85J90

Pin

SS VSS VSS VSS 23 51 VSS VSS VSS VSS 65

DD AVDD ICEVDD AVDD 37 65 RD5 SEG5 SEG5 RD5 79

SS AVSS AVSS AVSS 38 66 RD4 SEG4 SEG4 RD4 80

SS VSS VSS VSS 44 71 VDD VDD VDD VDD 2

DD ICEVDD ICEVDD VDD 45 72 RD0 SEG0 SEG0 RD0 3

ICE Pin

ICEMCLR RG5 20 49 RA7 OSC1 OSC1 RA7 62

ICE

Port

ICE

Pin
No.

PIC18F85J90

PIM Pin No.

PIC18F85J90

Port

RC3 SEG17 SEG17 RA3 39

RB5 SEG29 SEG27 RG3 19

SS VSS VSS VSS 84

RE7 SEG31 SEG28 RG2 18

RH0 SEG47 SEG32 RJ0 76

RH1 SEG46 SEG31 RE7 4

PIC18F85J90

Pin

ICE Pin

ICE

Port

ICE
Pin
No.

DS51662A-page 23 © 2007 Microchip Technology Inc.

TABLE A-5: PIC18F85J90 LCD CONNECTIONS COMPARISON

PIC18F85J90 ICE Pin #

NC

COM2 COM2 22 COM3 COM2 19 COM1 COM1

SEG16 SEG16 23 X8,X6,X5,X7 X9,X11,X12,X10 18 SEG15 SEG15

SEG17 SEG17 24 X1,X3,X4,X2 X16,X14,X13,X15 17 SEG14 SEG14

SEG18 SEG18 25 -,F2,F1,F3 X17,X19,X20,X18 16 SEG13 SEG13

SEG19 SEG19 26 1A,1E,F4,1F -,X22,X21,- 15 SEG12 SEG12

SEG20 SEG20 27 1B,1C,1D,1G 3B,3C,-,3G 14 SEG11 SEG11

SEG21 SEG21 28 2A,2E,2D,2F 4A,4E,4D,4F 13 SEG10 SEG10

SEG22 SEG22 29 2B,2C,COL,2G 4B,4C,DP1,4G 12 SEG9 SEG9

SEG23 SEG23 30 3A,3E,3D,3F 5A,5E,5D,5F 11 SEG8 SEG8

SEG24 SEG24 31 S9,6G,6B,6C 5B,5C,-,5G 10 SEG7 SEG7

SEG25 SEG25 32 6D,6F,6A,6E X23,X25,X26,X24 9 SEG6 SEG6

SEG26 SEG26 33 X31,X33,X34,X32 S13,8G,8B,8C 8 SEG5 SEG5

SEG29 SEG27 34 -,X27,X35,X30 8D,8F,8A,8E 7 SEG4 SEG4

SEG31 SEG28 35 -,X28,X36,X29 DP2,7G,7B,7C 6 SEG3 SEG3

SEG44 SEG29 36 S1,S3,S4,S2 7D,7F,7A,7E 5 SEG2 SEG2

SEG45 SEG30 37 S6,-,-,S7 S11,-,-,- 4 SEG1 SEG1

SEG46 SEG31 38 S5,-,-S8 S12,-,-,S10 3 SEG0 SEG0

COM3 COM3 39 COM4 COM1 2 COM0 COM0

NC

Legend: Unshaded cells indicate a perfect match between the PIM and the glass.

Shaded cells indicate the pins that are remapped to the corresponding pin on the PIM.

21

40 NC NC 1

NC NC

Pin

ICE PIC18F85J90

#

NC

20

NC

© 2007 Microchip Technology Inc. DS51662A-page 24

PICDEM™ LCD 2 Demonstration Kit User’s Guide

FIGURE A-5: SEGMENT CONFIGURATION FOR PIC18F85J90 DEVICES

SEG29 SEG27

SEG31 SEG28

(1)

SEG44

SEG29

(1)

SEG30

SEG45

(1)

SEG46

SEG31

21

N.C.

COM2

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

SEG23

SEG24

SEG25

SEG26

(2)

(2)

(2)

COM3

40

N.C.

Legend: N.C. = No connection
Note 1: SEG44, SEG45, and SEG46 exist only on PIC18F85J90 devices.

2: Disable SEG27, SEG28, SEG30, and SEG32 when the LCD module is enabled. Although SEG32 is

not listed in the diagram, it is multiplexed with the Timer1 oscillator, and therefore, must be disabled
when the Timer1 oscillator is enabled.

© VL Electronics

20

COM1

SEG15
SEG14

SEG13

SEG12

SEG11

SEG10

SEG9

SEG8

SEG7

SEG6

SEG5

SEG4
SEG3

SEG2

SEG1

SEG0
COM0

1

N.C.

N.C.

TABLE A-6: PIC18F85J90 PORT AND PIN COMPARISON

PIC18F85J90

Port

RA0 AN0 AN0 RA0

RA1 SEG18 SEG18 RF0

RA6 OSC2 OSC2 RA6

RA7 OSC1 OSC1 RA7

RB0 RB0 RB0 RB0

RB5 SEG29 SEG27 RG3

RB6 RB6 RB6 RB6

RB7 RB7 RB7 RB7

RC0 T1OSC1 T1OSC0 RC0

RC1 TIOSC0 TIOSC1 RC1

RC3 SEG17 SEG17 RA3

RC4 SEG16 SEG16 RA2

RC6 TX/CK TX/CK RC6

RC7 RX/DT RX/DT RC7

Legend: Unshaded cells indicate a perfect match between the PIM and the glass.

Shaded cells indicate the pins that are remapped to the corresponding pin on the PIM.

PIC18F85J90 PIN ICE Pin ICE Port

DS51662A-page 25 © 2007 Microchip Technology Inc.

TABLE A-7: PIC18F8490 PIM AND ICE PORT/PIN COMPARISON

PIC18F8490
PIM Pin No.

PIC18F8490

Port

PIC18F8490

Pin

ICE Pin

1 RH2 SEG45 SEG45 RH2 12 41 RJ6 SEG37 SEG37 RJ6 54

2 RH3 SEG44 SEG44 RH3 13 42 RJ7 SEG36 SEG36 RJ7 55

3 LCDBIAS2 LCDBIAS2 BIAS2 RE1 14 43 RC2 SEG13 SEG13 RC2 56

4 LCDBIAS1 LCDBIAS1 BIAS1 RE0 15 44 RC3 RC3 RC3 RC3 57

5 RG0 SEG30 SEG30 RG0 16 45 RC4 RC4 RC4 RC4 58

6 RG1 SEG29 SEG29 RG1 17 46 RC5 SEG12 SEG12 RC5 59

7 RG2 SEG28 SEG28 RG2 18 47 RB7 RB7 RB7 RB7 60

8 RG3 SEG27 SEG27 RG3 19 48 V

9RG5MCLR

ICEMCLR RG5 20 49 RA7 OSC1 OSC1 RA7 62

10 RG4 SEG26 SEG26 RG4 21 50 RA6 OSC2 OSC2 RA6 63

11 V

12 V

SS VSS VSS VSS 23 51 VSS VSS VSS VSS 65

DD VDD ICEVDD VDD 24 52 RB6 RB6 RB6 RB6 66

13 RF7 SEG25 SEG25 RF7 25 53 RB5 RB5 RB5 RB5 67

14 RF6 SEG24 SEG24 RF6 26 54 RB4 SEG11 SEG11 RB4 68

15 RF5 SEG23 SEG23 RF5 27 55 RB3 SEG10 SEG10 RB3 69

16 RF4 SEG22 SEG22 RF4 28 56 RB2 SEG9 SEG9 RB2 70

17 RF3 SEG21 SEG21 RF3 29 57 RB1 SEG8 SEG8 RB1 71

18 RF2 SEG20 SEG20 RF2 30 58 RB0 RB0 RB0 RB0 72

19 RH7 SEG43 SEG43 RH7 31 59 RJ3 SEG35 SEG35 RJ3 73

20 RH6 SEG42 SEG42 RH6 32 60 RJ2 SEG34 SEG34 RJ2 74

21 RH5 SEG41 SEG41 RH5 33 61 RJ1 SEG33 SEG33 RJ1 75

22 RH4 SEG40 SEG40 RH4 34 62 RJ0 SEG32 SEG32 RJ0 76

23 RF1 SEG19 SEG19 RF1 35 63 RD7 SEG7 SEG7 RD7 77

24 RF0 SEG18 SEG18 RF0 36 64 RD6 SEG6 SEG6 RD6 78

25 AV

26 AV

DD AVDD ICEVDD AVDD 37 65 RD5 SEG5 SEG5 RD5 79

SS AVSS AVSS AVSS 38 66 RD4 SEG4 SEG4 RD4 80

27 RA3 SEG17 SEG17 RA3 39 67 RD3 SEG3 SEG3 RD3 81

28 RA2 SEG16 SEG16 RA2 40 68 RD2 SEG2 SEG2 RD2 82

29 RA1 AN1 AN1 RA1 41 69 RD1 SEG1 SEG1 RD1 83

30 RA0 AN0 AN0 RA0 42 70 V

31 V

32 V

SS VSS VSS VSS 44 71 VDD VDD VDD VDD 2

DD VDD ICEVDD VDD 45 72 RD0 SEG0 SEG0 RD0 3

33 RA5 SEG15 SEG15 RA5 46 73 RE7 SEG31 SEG31 RE7 4

34 RA4 SEG14 SEG14 RA4 47 74 RE6 COM3 COM3 RE6 5

35 RC1 TIOSC0 TIOSC1 RC1 48 75 RE5 COM2 COM2 RE5 6

36 RC0 T1OSC1 T1OSC0 RC0 49 76 RE4 COM1 COM1 RE4 7

37 RC6 TX/CK TX/CK RC6 50 77 COM0 COM0 COM0 RE3 8

38 RC7 RX/DT RX/DT RC7 51 78 LCDBIAS3 LCDBIAS3 BIAS3 RE2 9

39 RJ4 SEG39 SEG39 RJ4 52 79 RH0 SEG47 SEG47 RH0 10

40 RJ5 SEG38 SEG38 RJ5 53 80 RH1 SEG46 SEG46 RH1 11

ICE

Port

ICE
Pin
No.

PIC18F8490
PIM Pin No.

PIC18F8490

Port

PIC18F8490

Pin

DD VDD ICEVDD VDD 61

SS VSS VSS VSS 84

ICE Pin

ICE

Port

ICE
Pin
No.

© 2007 Microchip Technology Inc. DS51662A-page 26

PICDEM™ LCD 2 Demonstration Kit User’s Guide

TABLE A-8: PIC18F8490 LCD CONNECTIONS COMPARISON

PIC18F8490 ICE Pin # Pin # ICE PIC18F8490

NC 21 NC NC 20 NC

COM2 COM2 22 COM3 COM2 19 COM1 COM1

SEG16 SEG16 23 X8,X6,X5,X7 X9,X11,X12,X10 18 SEG15 SEG15

SEG17 SEG17 24 X1,X3,X4,X2 X16,X14,X13,X15 17 SEG14 SEG14

SEG18 SEG18 25 -,F2,F1,F3 X17,X19,X20,X18 16 SEG13 SEG13

SEG19 SEG19 26 1A,1E,F4,1F -,X22,X21,- 15 SEG12 SEG12

SEG20 SEG20 27 1B,1C,1D,1G 3B,3C,-,3G 14 SEG11 SEG11

SEG21 SEG21 28 2A,2E,2D,2F 4A,4E,4D,4F 13 SEG10 SEG10

SEG22 SEG22 29 2B,2C,COL,2G 4B,4C,DP1,4G 12 SEG9 SEG9

SEG23 SEG23 30 3A,3E,3D,3F 5A,5E,5D,5F 11 SEG8 SEG8

SEG24 SEG24 31 S9,6G,6B,6C 5B,5C,-,5G 10 SEG7 SEG7

SEG25 SEG25 32 6D,6F,6A,6E X23,X25,X26,X24 9 SEG6 SEG6

SEG26 SEG26 33 X31,X33,X34,X32 S13,8G,8B,8C 8 SEG5 SEG5

SEG27 SEG27 34 -,X27,X35,X30 8D,8F,8A,8E 7 SEG4 SEG4

SEG28 SEG28 35 -,X28,X36,X29 DP2,7G,7B,7C 6 SEG3 SEG3

SEG29 SEG29 36 S1,S3,S4,S2 7D,7F,7A,7E 5 SEG2 SEG2

SEG30 SEG30 37 S6,-,-,S7 S11,-,-,- 4 SEG1 SEG1

SEG31 SEG31 38 S5,-,-S8 S12,-,-,S10 3 SEG0 SEG0

COM3 COM3 39 COM4 COM1 2 COM0 COM0

NC 40 NC NC 1 NC

FIGURE A-6: SEGMENT CONFIGURATION FOR PIC18F8490 DEVICES

21

N.C.

COM2

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

SEG23

SEG24

SEG25

SEG26

SEG27

SEG28

SEG29

SEG30

SEG31

COM3

40

N.C.

Legend: N.C. = No connection

20

COM1

SEG15
SEG14

SEG13

SEG12

SEG11

SEG10

SEG9

SEG8

SEG7

SEG6

SEG5

SEG4
SEG3

SEG2

SEG1

SEG0

COM0

1

© VL Electronics

N.C.

N.C.

DS51662A-page 27 © 2007 Microchip Technology Inc.

TABLE A-9: PIC18F8490 PIN AND PORT COMPARISON

PIC18F8490 Port PIC18F8490 Pin ICE Pin ICE Port

RA0 AN0 AN0 RA0

RA1 AN1 AN1 RA1

RA6OSC2OSC2RA6

RA7OSC1OSC1RA7

RB0 RB0 RB0 RB0

RB5 RB5 RB5 RB5

RB6 RB6 RB6 RB6

RB7 RB7 RB7 RB7

RC0 T1OSC1 T1OSC0 RC0

RC1 TIOSC0 TIOSC1 RC1

RC3 RC3 RC3 RC3

RC4 RC4 RC4 RC4

RC6 TX/CK TX/CK RC6

RC7 RX/DT RX/DT RC7

© 2007 Microchip Technology Inc. DS51662A-page 28

PICDEM™ LCD 2 Demonstration Kit User’s Guide

TABLE A-10: PIC16F946 PIM AND ICE PIN/PORT COMPARISON

PIC16F946

PIM Pin

No.

Legend: Unshaded cells indicate where a perfect match between PIM and ICE pins and ports exists.

PIC16F946

Port

1 RD6 SEG19 SEG19 RF1 35 33 RE0 SEG21 SEG21 RF3 29

2

3

4

5

6

7

8

9V

10 V

11

12

13

14

15 RB0 RB0 RB0 RB0 72 47

16

17

18

19 V

20 V

21

22

23 RB6 RB6 RB6 RB6 66 55 RD2 NC NC

24 RB7 RB7 RB7 RB7 60 56 V

25 AV

26 AV

27 RA0 AN0 AN0 RA0 42 59 RC4 RC4 RC4 VLCAP1\

28 RA1 AN1 AN1 RA1 41 60

29

30

31

32

RD7 SEG20 SEG20 RF2 30 34 RE1 SEG22 SEG22 RF4 28

RG0 SEG36 SEG36 RB1 71 35 RE2 SEG23 SEG23 RF5 27

RG1 SEG37 SEG37 RB2 70 36 ICEMCLR ICEMCLR ICEMCLR ICEMCLR 20

RG2 SEG38 SEG38 RJ5 53 37 RE4 SEG24 SEG24 RF6 26

RG3 SEG39 SEG39 RJ4 52 38 ICEVDD ICEVDD ICEVDD ICEVDD 61

RG4 SEG40 SEG40 RH4 34 39 RA7 T1OSCI T1OSCI RC1 48

RG5 SEG41 SEG41 RH5 33 40 RA6 T1OSCO T1OSCO RC0 49

RF0 SEG32 SEG32 RJ0 76 43 RE6 SEG26 SEG26 RG4 21

RF1 SEG33 SEG33 RD0 3 44 RE7 SEG27 SEG27 RG3 19

RF2 SEG34 SEG34 RD6 78 45 RE4 SEG28 SEG28 RG2 18

RF3 SEG35 SEG35 RD7 77 46 RF5 SEG29 SEG29 RG1 17

RB1 SEG1 SEG1 RD1 83 48 RF7 SEG31 SEG31 RE7 4

RB2 SEG2 SEG2 RD2 82 49 RC0 VLCD1 BIAS1 RE0 15

RB3 SEG3 SEG3 RD3 81 50 RC1 VLCD2 BIAS2 RE1 14

RB4 COM0 COM0 RE3 8 53 RD0 COM3 COM3 RE6 5

RB5 COM1 COM1 RE4 7 54 RD1 NC NC

RA2 COM2 COM2 RE5 6 61 RC6 TX/CK TX/CK TX/CK 50

RA3 SEG15 SEG15 RA5 46 62 RC7 RX/DT RX/DT RX/DT 51

RA4 SEG4 SEG4 RD4 80 63 RD4 SEG17 SEG17 RA3 39

RA5 SEG5 SEG5 RD5 79 64 RD5 SEG18 SEG18 RF0 36

Shaded cells indicate where differences between PIM and ICE ports and pins exist.

Bold text indicates the PIM pins that are not connected to any ICE pins or ports.

PIC16F946

Pin

SS VSS VSS VSS 23 41 VSS VSS VSS VSS 65

DD VDD ICEVDD ICEVDD 24 42 RE5 SEG25 SEG25 RF7 25

DD VDD ICEVDD ICEVDD 37 51 RC2 VLCD3 BIAS3 RE2 9

SS VSS VSS AVSS 38 52 RC3 RC3 VLCAP1 RC3 57

DD AVDD ICEVDD ICEVDD 45 57 VDD VDD VDD VDD 2

SS AVSS AVSS AVSS 44 58 RD3 SEG16 SEG16 RA2 40

ICE Pin ICE Port

ICE
Pin
No.

PIC16F946

PIM Pin

No.

PIC16F946

Port

RF6 SEG30 SEG30 RG0 16

RC5 SEG10 SEG10 RB3 69

PIC16F946

Pin

SS VSS VSS VSS 1

ICE Pin ICE Port

ICE
Pin
No.

58

RC4

DS51662A-page 29 © 2007 Microchip Technology Inc.

TABLE A-11: PIC16F946 LCD CONNECTIONS COMPARISON

PIC16F946 ICE Pin # Pin # ICE PIC16F946

NC 21 NC NC 20 NC

COM2 COM2 22 COM3 COM2 19 COM1 COM1

SEG16 SEG16 23 X8,X6,X5,X7 X9,X11,X12,X10 18 SEG15 SEG15

SEG17 SEG17 24 X1,X3,X4,X2 X16,X14,X13,X15 17 SEG14

SEG18 SEG18 25 -,F2,F1,F3 X17,X19,X20,X18 16 SEG13

SEG19 SEG19 26 1A,1E,F4,1F -,X22,X21,- 15 SEG12

SEG20 SEG20 27 1B,1C,1D,1G 3B,3C,-,3G 14 SEG11

SEG21 SEG21 28 2A,2E,2D,2F 4A,4E,4D,4F 13 SEG10 SEG10

SEG22 SEG22 29 2B,2C,COL,2G 4B,4C,DP1,4G 12 SEG9

SEG23 SEG23 30 3A,3E,3D,3F 5A,5E,5D,5F 11 SEG8

SEG24 SEG24 31 S9,6G,6B,6C 5B,5C,-,5G 10 SEG7

SEG25 SEG25 32 6D,6F,6A,6E X23,X25,X26,X24 9 SEG6

SEG26 SEG26 33 X31,X33,X34,X32 S13,8G,8B,8C 8 SEG5 SEG5

SEG27 SEG27 34 -,X27,X35,X30 8D,8F,8A,8E 7 SEG4 SEG4

SEG28 SEG28 35 -,X28,X36,X29 DP2,7G,7B,7C 6 SEG3 SEG3

SEG29 SEG29 36 S1,S3,S4,S2 7D,7F,7A,7E 5 SEG2 SEG2

SEG30 SEG30 37 S6,-,-,S7 S11,-,-,- 4 SEG1 SEG1

SEG31 SEG31 38 S5,-,-S8 S12,-,-,S10 3 SEG0 SEG33

COM3 COM3 39 COM4 COM1 2 COM0 COM0

NC 40 NC NC 1 NC

Legend: Unshaded cells indicate a perfect match between the PIM and the glass.

Shaded cells indicate the pins that are remapped to the corresponding pin on the PIM.

SEG41

SEG40

SEG39

SEG38

SEG37

SEG36

SEG35

SEG34

FIGURE A-7: SEGMENT CONFIGURATION FOR PIC16F946 DEVICES

21

N.C.

COM2

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

SEG23

SEG24

SEG25

SEG26

SEG27

SEG28

SEG29

SEG30

SEG31

COM3

40

N.C.

Legend: N.C. = No connection
Note 1: Disable SEG0, SEG6, SEG7, SEG8, SEG9, SEG11, SEG12, SEG13 and SEG14 when the LCD module is enabled.

20

N.C.

COM1

SEG15

(1)

SEG14

SEG41

(1)

SEG13

SEG40

(1)

SEG12

SEG39

(1)

SEG11

SEG38

SEG10

(1)

SEG9

SEG37

(1)

SEG8

SEG36

(1)

SEG35

SEG7

(1)

SEG34

SEG6

SEG5

SEG4
SEG3

SEG2

SEG1

(1)

SEG0

SEG33

COM0

1

N.C.

© VL Electronics

© 2007 Microchip Technology Inc. DS51662A-page 30

PICDEM™ LCD 2 Demonstration Kit User’s Guide

TABLE A-12: PIC16F946 PORT AND PIN COMPARISON

PIC16F946 Port PIC16F946 Pin ICE Pin ICE Port

RA0 AN0 AN0 RA0

RA1 AN1 AN1 RA1

RA6 T1OSCO T1OSCO RC0

RA7 T1OSCI T1OSCI RC1

RB0 RB0 RB0 RB0

RB5 COM1 COM1 RE4

RB6 RB6 RB6 RB6

RB7 RB7 RB7 RB7

RC0 VLCD1 BIAS1 RE0

RC1 VLCD2 BIAS2 RE1

RC3 RC3 RC3 RC3

RC4 RC4 RC4 RC4

RC6 TX/CK TX/CK RC6

RC7 RX/DT RX/DT RC7

Legend: Unshaded cells indicate a perfect match between the PIM and the glass.

Shaded cells indicate the pins that are remapped to the corresponding pin/port on the PIM.

DS51662A-page 31 © 2007 Microchip Technology Inc.

TABLE A-13: PIC16F917 PIM AND ICE PIN/PORT COMPARISON

PIC16F917

PIM Pin No.

1 RC7 RX/DT RX/DT RC7 51

2

3

4

5

6V

7VDD ICEVDD ICEVDD VDD 45

8 RB0 RB0 RB0 RB0 72

9

10

11

14

15

16 RB6 RB6 RB6 RB6 66

17 RB7 RB7 RB7 RB7 60

18 ICEMCLR ICEMCLR ICEMCLR ICEMCLR 20

19 RA0 AN0 AN0 RA0 42

20 RA1 AN1 AN1 RA1 41

21

22

23

24

25

26

27

28 V

29 V

30 RA7 T1OSCI T1OSCI RC1 48

31

32

35

36

37

38

39

40

41

42

43

44 RC6 TX/CK TX/CK RC6 50

Legend: Unshaded cells indicate where a perfect match between PIM and ICE pins and ports exists.

Shaded cells indicate where differences between PIM and ICE ports and pins exist.

Bold text indicates the PIM pins that are not connected to any ICE pins or ports.

PIC16F917

Port

PIC16F917

Pin

ICE Pin ICE Port ICE Pin No.

RD4 SEG17 SEG17 RA3 17

RD5 SEG18 SEG18 RF0 18

RD6 SEG19 SEG19 RF1 19

RD7 SEG20 SEG20 RF2 20

SS VSS VSS VSS VSS

RB1 SEG1 SEG6 RD6 78

RB2 SEG2 SEG7 RD7 77

RB3 SEG3 SEG8 RB1 71

RB4 COM0 COM0 RE3 8

RB5 COM1 COM1 RE4 7

RA2 COM2 COM2 RE5 6

RA3 SEG15 SEG15 RA5 15

RA4 SEG4 SEG9 RB2 4

RA5 SEG5 SEG10 RB3 5

RE0 SEG21 SEG21 RF3 21

RE1 SEG22 SEG22 RF4 22

RE2 SEG23 SEG23 RF5 23

DD ICEVDD2ICEVDD VDD 2

SS VSS VSS VSS VSS

RA6 T1OSCO T1OSCO RC0 49

RC0 VLCD1 BIAS1 RE0 15

RC1 VLCD2 BIAS2 RE1 14

RC2 VLCD3 BIAS3 RE2 9

RC3 SEG6 SEG11 RB4 68

RD0 COM3 COM3 RE6 5

RD1 RD1 RC3 RC3 57

RD2 RD2 RC4 RC4 58

RD3 SEG16 SEG16 RA2 16

RC4 SEG11 SEG14 RA4 47

RC5 SEG10 SEG13 RC2 56

© 2007 Microchip Technology Inc. DS51662A-page 32

PICDEM™ LCD 2 Demonstration Kit User’s Guide

TABLE A-14: PIC16F917 LCD CONNECTIONS COMPARISON

PIC16F917 ICE Pin # Pin # ICE PIC16F917

NC 21 NC NC 20 NC

COM2 COM2 22 COM3 COM2 19 COM1 COM1

SEG16 SEG16 23 X8,X6,X5,X7 X9,X11,X12,X10 18 SEG15 SEG15

SEG17 SEG17 24 X1,X3,X4,X2 X16,X14,X13,X15 17 SEG14

SEG18 SEG18 25 -,F2,F1,F3 X17,X19,X20,X18 16 SEG13

SEG19 SEG19 26 1A,1E,F4,1F -,X22,X21,- 15 SEG12 NC

SEG20 SEG20 27 1B,1C,1D,1G 3B,3C,-,3G 14 SEG11

SEG21 SEG21 28 2A,2E,2D,2F 4A,4E,4D,4F 13 SEG10

SEG22 SEG22 29 2B,2C,COL,2G 4B,4C,DP1,4G 12 SEG9

SEG23 SEG23 30 3A,3E,3D,3F 5A,5E,5D,5F 11 SEG8

NC SEG24 31 S9,6G,6B,6C 5B,5C,-,5G 10 SEG7

NC SEG25 32 6D,6F,6A,6E X23,X25,X26,X24 9 SEG6

NC SEG26 33 X31,X33,X34,X32 S13,8G,8B,8C 8 SEG5 NC

NC SEG27 34 -,X27,X35,X30 8D,8F,8A,8E 7 SEG4 NC

NC SEG28 35 -,X28,X36,X29 DP2,7G,7B,7C 6 SEG3 NC

NC SEG29 36 S1,S3,S4,S2 7D,7F,7A,7E 5 SEG2 NC

NC SEG30 37 S6,-,-,S7 S11,-,-,- 4 SEG1 NC

NC SEG31 38 S5,-,-S8 S12,-,-,S10 3 SEG0 NC

COM3 COM3 39 COM4 COM1 2 COM0 COM0

NC 40 NC NC 1 NC

Legend: Unshaded cells indicate a perfect match between the PIM and the glass.

Shaded cells indicate the pins that are remapped to the corresponding pin on the PIM.
Bold text indicates the PIM pins that are not connected.

SEG11

SEG10

SEG6

SEG5

SEG4

SEG3

SEG2

SEG1

FIGURE A-8: SEGMENT CONFIGURATION FOR PIC16F914/917 DEVICES

21

N.C.

SEG16 SEG16

SEG17 SEG17

SEG18 SEG18
SEG19 SEG19

SEG20 SEG20

SEG21 SEG21
SEG22 SEG22

SEG23 SEG23

COM2

SEG24

SEG25
SEG26

SEG27
SEG28

SEG29

SEG30
SEG31

COM3

40

N.C.

Legend: N.C. = No connection

Note 1: Disable SEG0, SEG7, SEG8, SEG9, SEG12, and SEG14 when the LCD module is enabled.

= Only segments available to PIC16F914/917 devices

20

N.C.

COM1

SEG15 SEG15

(1)

SEG11

SEG14

(1)

SEG10

SEG13

(1)

SEG12

SEG11 SEG6

SEG10 SEG5

(1)

SEG4

SEG9

(1)

SEG3

SEG8

(1)

SEG7

SEG2

SEG6 SEG1

SEG5

SEG4
SEG3

SEG2

SEG1

(1)

SEG0
COM0

1

N.C.

© VL Electronics

DS51662A-page 33 © 2007 Microchip Technology Inc.

TABLE A-15: PIC16F917 PIN AND PORT COMPARISON

Legend: Unshaded cells indicate a perfect match between the PIM and the glass.

A.3 LED DISPLAY

Two green LEDs are connected to RC3 and RC4 of U1A through the J14 pins, 1, 2 and
7, 8 (outer ends), respectively.

One green LED is provided to determine whether there is power to the LCD 2
Demonstration Board (LED on) or not (LED off).

PIC16F917 Port PIC16F917 Pin ICE Pin ICE Port

RA0 AN0 AN0 RA0

RA1 AN1 AN1 RA1

RA6 T1OSCO T1OSCO RC0

RA7 T1OSCI T1OSCI RC1

RB0 RB0 RB0 RB0

RB5 COM1 COM1 RE4

RB6 RB6 RB6 RB6

RB7 RB7 RB7 RB7

RC0 VLCD1 BIAS1 RE0

RC1 VLCD2 BIAS2 RE1

RC3 SEG6 SEG11 RB4

RC4 SEG11 SEG14 RA4

RC6 TX/CK TX/CK RC6

RC7 RX/DT RX/DT RC7

Shaded cells indicate the pins that are remapped to the corresponding pin on the PIM.

Note 1: For the PIC18F85J90 PIM, the RG2 and RG3 pins are connected to RC3

and RC4 of U1A, respectively.

2: For the PIC16F17 PIM, the RD1 and RD2 pins are connected to RC3 and

RC4 of U1A, respectively.

3: For the PIC18F8490 PIM, the RC3 and RD4 pins are connected to RC3

and RC4 of U1A, respectively

A.4 CHARGE PUMP AND VLCAP

For charge pump mode operation in PIC18F85J90 devices, it is required that RC3 and
RC4 of U1A connect to charge pump capacitor C7 through the J14 pins, 3, 4 and 5, 6
(inner pins), respectively.

A.5 RESISTIVE LADDER VERSUS CHARGE PUMP

The switch, S6, allows the connection of either the resistor ladder or the capacitors to
the BIAS pins to generate the BIAS voltages for the LCD operation. For the charge
pump mode operation in PIC18F85J90 devices, it is required that the S6 switch is
flipped towards C and the VLCAP is connected through the inner jumpers of J14. For
the resistor ladder, S6 must be flipped towards R. The R45 potentiometer controls the
contrast to the LCD in the Resistive Ladder mode.

A.5.1 Jumper JP21

When jumper JP21 is on, the LCDBIAS0 is physically tied to ground. The jumper needs
to be on for PIC18F85J90 devices when the bias voltages are generated through the
resistor ladder.

© 2007 Microchip Technology Inc. DS51662A-page 34

PICDEM™ LCD 2 Demonstration Kit User’s Guide

A.6 OSCILLATOR OPTIONS

The on-board firmware uses the internal RC oscillator running at 8 MHz.

• Internal RC oscillator running at 8 MHz can be used.

• Pads provided for user-furnished crystal/resonator (Y2) and two capacitors
(C16 and C17).

• Socket provided for a canned oscillator (Y3). This oscillator can be disabled by
removing jumpers, JP9, JP11 and JP12.

• 32.768 kHz (watch-type) crystal for Timer1 (Y1) is always connected to RC0 and
RC1.

A.7 RS-232 SERIAL PORT

An RS-232 level shifting IC has been provided with all necessary hardware to support
connection of an RS-232 host through the DB9 connector (PI). The port is configured
as DCE and can be connected to a PC using a serial cable.

A.8 REAL-TIME CLOCK

This circuit allows the user to configure a PIC microcontroller for timekeeping using a

32.768 kHz clock crystal connected to Timer1 module’s T1OSO and T1OSI pins.

A.9 SERIAL EEPROM

A socket for a Microwire EEPROM is provided on the board to illustrate usage of
the Synchronous mode of operation of the USART module. For its operation:

• Jumpers, JP15 and JP16, should be connected.

• In the jumper, J6, U9-CS should be connected with RB5.

• In the jumper, J13, U9-ORG (pin 6) should be connected to GND.

Note 1: For the PIC18F85J90 PIM, the RG2 and RG3 pins are connected to RC3

2: For the PIC16F917 PIM, the RD1 and RD2 pins are connected to RC3

3: For the PIC18F8490 and the PIC16F946 PIMs, the RC3 and RC4 pins

A.10 ANALOG INPUT

A 10 kΩ potentiometer is connected through a series of 100Ω resistors to AN0. The
potentiometer can be adjusted from V
connecting the potentiometer to AN0.

and RC4 of U1A, respectively.

and RC4 of U1A, respectively.

are connected to RC3 and RC4 of U1A, respectively.

CC to GND. The jumper, J11, should be

DS51662A-page 35 © 2007 Microchip Technology Inc.

A.11 TEMPERATURE SENSOR

A 10 kΩ TC thermistor (R11) is provided to sense the temperature. It is connected to
AN1 (RA1) through the jumper, JP5. An optional unpopulated TC77-based circuit is
provided to read the temperature serially using the USART module. The jumpers, JP15
and JP16, are to be connected and RA1 of U1A should be made digital to be used to
enable TC77.

Note 1: For the PIC18F85J90 PIM, the RA2 pin is connected to RA1 of U1A and

AN2 is used instead of AN1.

2: For the PIC18F8490, PIC16F946, and PIC16F917 PIMs, the RA1 pin is

connected to RA1 of U1A.

A.12 SWITCHES

Four switches provide the following functions for digital I/Os:

• S1 – Active-low switch connected to RB6.

• S2 – Active-low switch connected to RB6 and RB7.

• S3 – Active-low switch connected to RB6, RB7 and RA6.

• S4 – Active-low switch connected to RB6, RB7, RA6 and RA7.

For this type of sensing, the jumpers, JP1, JP2, JP6, JP18, JP19, JP9 and JP10,
should be connected and the potentiometer should be connected to AN0 through J11.
Sensing should be done in the sequence, S1, S2, S3 and S4, only. Individual switch
sensing is not allowed.

Additionally, the four switches provide the following functions for analog input (AN0):

• S1 – AN0 will be approximately at V

• S2 – AN0 will be approximately at V

• S3 – AN0 will be approximately at V

• S4 – AN0 will be approximately at V

For this type of sensing, the jumpers, JP1, JP2, JP6, JP18 and JP19, should not be
connected and the SWT should be connected to AN0 through J11.

CC/2.
CC/3.
CC/5.2.
CC/7.7.

A.13 ICD CONNECTOR

By way of the modular connector (J37), the MPLAB ICD 2 can be connected for
low-cost debugging. The ICD connector utilizes RB6/PGC and RB7/PGD of the
microcontrollers for in-circuit debugging.

© 2007 Microchip Technology Inc. DS51662A-page 36

PICDEM™ LCD 2 Demonstration Kit User’s Guide

A.14 POWER SUPPLY

There are four ways to supply power to the PICDEM LCD 2:

• A 3V button cell (CR2032) can be plugged into BT1.

• A 9V, 100 mA unregulated AC to DC supply can be plugged into J5. A
power supply can be purchased through Microchip Technology
(Part Number AC162039).

• A 100 mA regulated DC supply of maximum +5V can be connected to the hooks
provided.

Note: There is one J15 jumper associated with the power supply circuit. This

jumper must be correctly connected to select the required power supply.
Refer to Figure A-9 for jumper setting examples.

MPLAB ICD 2 users may use the ICD to power the target board to 5V, up to 200 mA,
for the following devices
PIC18F85J90 family of devices do not support this capability.

The default power on the board is 5V. The board voltage can be varied based on
resistors populated on the PIM in conjunction with the processor being used.

FIGURE A-9: J15 POWER SUPPLY CIRCUIT SETTING EXAMPLES

only

: PIC18F8490, PIC16F946 and PIC16F916. The

EXAMPLE A EXAMPLE B EXAMPLE C

J15

1

3

5

VLCDBIAS = 3V, External Power

a) External Supply with

VLCDBIAS Regulated
(Default): This is the recom­mended jumper setting to
operate when using external
supply. This configuration
allows the VLCDBIAS to be
regulated to 3V even if the V
of the board is higher than 3V.

Note: For all examples shown above, the voltage regulation on the VLCDBIAS for 3V is not required for the

2

4

6

b) Battery Operation: This is the

recommend jumper setting
when operating on a battery. In
this configuration, VLCDBIAS is
directly connected to the battery
voltage.

DD

regular operation of the module or device. It is added here for additional protection for the glass since
the board is capable of generating 3.3V or 5V depending on the PIM being used.

J15

1

3

5

VLCDBIAS = Battery

2

4

6

1

3

5

VLCDBIAS = VCC

c) External Supply with VLCDBIAS

Unregulated: This is not recom­mended to use with on-board glass
as voltage higher than 3V may
damage the glass.
If an external glass is connected to
J2 and is capable of handling
higher voltages, then this jumper
setting allows V
directly to the VLCDBIAS when an
external power supply is used.

J15

2

4

6

CC to connect

DS51662A-page 37 © 2007 Microchip Technology Inc.

A.14.1 Using the Adjustable Voltage Regulator

The PICDEM LCD 2 board features an adjustable voltage regulator, the venerable
LM317. It is U3 on the board, and can be recognized by the SO-223 package on the
upper left side. Nearby, there is a header, J10, and two resistors, R25 and R26. R25
and R26 are used to set the output voltage of the LM317. By default, R25 = 1K and
R26 = 330R, which results in an output voltage of 5.0V.

The reason an adjustable voltage regulator is provided is so that the PICDEM LCD 2
Demonstration Board can be used with a wide range of LCD PIC microcontrollers. The
PIC18FXXJ90 family of devices tolerates a maximum V
PIC18FXX90, PIC16F91X and PIC16F946 tolerate a maximum V
adjustable voltage regulator allows a different V

DD to be provided for PIC18FJ devices

and PIC18F and PIC16F LCD devices.

The switching between 3.6V and 5.5V parts is very convenient. The plug-in module
boards are populated with the R101 and R102, appropriately, according to the proces­sor module requirement which mates with the daughterboard/emulator header that
surrounds the ICE module (U1A). J10 on the PICDEM LCD 2 board is intended to con­nect with the 3-pin header on the plug-in module. This allows the resistors, R101 and
R102, on the plug-in module to be connected in parallel to the resistors, R25 and R26.
This way V

DD can automatically be adjusted to the voltage appropriate to the part

soldered onto the plug-in module.

The plug-in module is prepopulated with the values shown in Table A-16:

TABLE A-16: PIM PREPOPULATED VALUES

Module R101 R102 VDD

PIC18F85J90 Open 1.18K 3.3V

PIC18F8490 Open Open 5.0V

PIC16F914/917 Open Open 5.0V
PIC16F946 Open Open 5.0V

DD of 3.6V, whereas the

DD of 5.5V. The

For V

DD = 3.3 volts, R101 can be left unpopulated and R102 can be 1.18K.

(1% resistors are recommended for precise adjustment of V

Now, let’s look at how to determine R101 and R102 if a different V

DD.)

DD is desired. First,

it is a good idea to look at the data sheet for the LM317 to understand how the voltage
is adjusted. We won’t duplicate all the details here. The following equation is taken from
an LM317 data sheet:

EQUATION A-1:

VOUT = VREF (1+ R2/R1) + IADJ * R2

I

ADJ is minimized by the LM317, so it can be assumed to be zero or at least very small.

V

REF =1.25V; it is the reference voltage developed by the LM317 between the output

and adjustment terminal.

That gives us the following equation:

EQUATION A-2:

VOUT = 1.25V(1+R2/R1)
R2 = R25 || R102 = (R25* R102)/(R25+R102)
R1 = R26 || R101.= (R26* R101)/(R26+R101)

As stated previously, R25 = 1K and R26 = 330. You can see that without R102 and
R101, V

OUT = 1.25V(1+ 1K/330R) = 5.04V.

© 2007 Microchip Technology Inc. DS51662A-page 38

PICDEM™ LCD 2 Demonstration Kit User’s Guide

For a desired VOUT, first solve for R2, given R1 = R26 = 330R. Then, knowing R2 and
R25, solve for R102. Determine the nearest available resistor value for R102 and
recalculate the resulting V
part you will be using.

Table A-17 shows values for R101 and R102 for different V
R25 and R26 on the PICDEM LCD 2 Board are left as their default values of 1K and
330R.

DD to make sure it doesn’t exceed the maximum VDD for the

DD values, assuming that

TABLE A-17: R101 AND R102 V

VDD R101 R102

5V Open Open

3.6V Open 1.62K

3.3V Open 1.18K

3.0V Open 866R

DD VALUES

Recommended operating voltages for the various PIMs are:

• PIC18F85J90 family of devices – 3.3V

• PIC18F8490 family of devices – 5V

• PIC16F917/914 devices – 5V

• PIC16F946 – 5V (when operating on an external 9V DC supply)

A.14.2 Slide Switch (S6)

The slide switch allows choosing the BIAS values, either generated by the resistor
ladder, or by the capacitive charge pump. When S6 is switched to the left, the LCDBIAS
pins of the microcontroller are connected to the resistor ladder. When S6 is switched to
the right, the LCDBIAS pins of the microcontroller are connected to the capacitor
network.

DS51662A-page 39 © 2007 Microchip Technology Inc.

A.15 BOARD LAYOUT AND SCHEMATICS

The following figures show the parts layout (silkscreen) and schematics for the
PICDEM LCD 2 board.

FIGURE A-10: PICDEM™ LCD 2 DEMONSTRATION BOARD PARTS LAYOUT (SILKSCREEN)

© 2007 Microchip Technology Inc. DS51662A-page 40

PICDEM™ LCD 2 Demonstration Kit User’s Guide

FIGURE A-11: PICDEM™ LCD 2 SCHEMATIC SHEET 1 OF 3

.1 μF

.1 μF

.1 μF

VDD

CC

V

VSS

153138101216

V+

VCC

C1+

C1-

C2+

C2-

245

6119

.1 μF

.1 μF

INVALID

FORCEON

EN

1

7

V-

FORCEOFF

GND

14

.1 μF

VCC

1 μF

VCC

VCC

VCC

VCC

VCC

CC

V

DS51662A-page 41 © 2007 Microchip Technology Inc.

FIGURE A-12: PICDEM™ LCD 2 SCHEMATIC SHEET 2 OF 3

VCC

.1 μF

VCC

VCC

VCC

.1 μF

.1 μF

.1 μF

.1 μF

VSS

VDD

32 kHz

VDD

VCC

VSS

VCC

VDD

VSS

VDD

VCC

VSS

AVSS

VCC

AVDD

VCC

VCC

.1 μF

© 2007 Microchip Technology Inc. DS51662A-page 42

PICDEM™ LCD 2 Demonstration Kit User’s Guide

FIGURE A-13: PICDEM™ LCD 2 SCHEMATIC SHEET 3 OF 3

.47 μF

.47 μF

.47 μF

.47 μF

1 μF

1 μF

VCC

.1 μF

VOUT

100 μF

VIN

.1 μF

VIN

VOUT

220 μF

DS51662A-page 43 © 2007 Microchip Technology Inc.

A.16 PIM LAYOUT AND SCHEMATICS

The following figures show the layout (silkscreen) for the individual PIMs.

FIGURE A-14: PIC18F65J90 AND PIC18F85J90 PIM LAYOUT

PIC18F65J90

PIC18F85J90 PICDEM™ LCD 2

FIGURE A-15: PIC16F914/917 PIM LAYOUT

PICDEM™ LCD 2

PIC16F917/914

© 2007 Microchip Technology Inc. DS51662A-page 44

PICDEM™ LCD 2 Demonstration Kit User’s Guide

FIGURE A-16: PIC16F946 PIM LAYOUT

PIC16F946 PICDEM™ LCD 2

FIGURE A-17: PIC18F6490/8490 PIM LAYOUT

PICDEM™ LCD 2

PIC18F6490
PIC18F8490

DS51662A-page 45 © 2007 Microchip Technology Inc.

FIGURE A-18: PICDEM™ LCD 2 PIC16F914/917 PIM SCHEMATIC

.1 μF

.1 μF

VSS

VSS

PIC16F917

FIGURE A-19: PICDEM™ LCD 2 PIC16F946 PIM SCHEMATIC

VSS

VDD

VSS

VDD

PIC16F946

VSS

VDD

AVSS

AVDD

VSS

VDD

© 2007 Microchip Technology Inc. DS51662A-page 46

PICDEM™ LCD 2 Demonstration Kit User’s Guide

FIGURE A-20: PICDEM™ LCD 2 PIC18F6490 64-PIN PIM SCHEMATIC

VSSVSS

VDD

VSS

VDD

AVSS

AVDD

PIC18F6490

VDD

VSS

VDD

FIGURE A-21: PICDEM™ LCD 2 PIC18F8490 80-PIN PIM SCHEMATIC

VSS

VDD

PIC18F8490

VSS

VDD

AVDD

AVSS

VSS

VDD

VSS

VDD

DS51662A-page 47 © 2007 Microchip Technology Inc.

FIGURE A-22: PICDEM™ LCD 2 PIC18F6XJ90 64-PIN PIM SCHEMATIC

VSS

VDD

VSS

VDDCORE/VCAP

AVDD

AVSS

PIC18F6XJ90

VSS

VSS

VDD

VDD

© 2007 Microchip Technology Inc. DS51662A-page 48

PICDEM™ LCD 2 Demonstration Kit User’s Guide

FIGURE A-23: PICDEM™ LCD 2 PIC18F85J90 80-PIN PIM SCHEMATIC

VSS

VDD

VSS

VDDCORE/VCAP

PIC18F85J90

AVDD

AVSS

VSS

VDD

VSS

VDD

DS51662A-page 49 © 2007 Microchip Technology Inc.

NOTES:

© 2007 Microchip Technology Inc. DS51662A-page 50

PICDEM™ LCD 2 DEMONSTRATION

KIT USER’S GUIDE

Index

A

Analog Input............................................................. 35

B

Board ......................................................................... 5

C

Charge Pump and Software Contrast ...................... 11

Clock ........................................................................ 11

Customer Support...................................................... 4

D

Demonstration Board.
Demonstration Programs.
Documentation

Conventions........................................................ 2

Layout ................................................................. 1

See

Board

See

Sample Programs.

H

Hardware Features .................................................... 6

I

Internet Address......................................................... 3

K

Kit Components ......................................................... 5

L

LCD

Digit Description................................................ 21

Display Definition.............................................. 21

SEGX and COMX ............................................. 22

LCD Display ............................................................. 20

LEDs

Green Display................................................... 34

Green Power..................................................... 34

M

Microchip Internet Web Site....................................... 3

MPASM Assembler.................................................... 9

MPLAB C18 C Compiler ............................................ 9

MPLAB ICD 2..................................................5

MPLAB ICE...........................................................5

MPLAB IDE................................................................ 9

, 10, 36

, 10

O

Oscillator Options..................................................... 35

Oscillator Selection .................................................. 10

P

Part Numbers........................................................... 19

PIC16XXXX

Demo ................................................................ 11

PIC18XXXX

Demo Program.................................................. 11

PICDEM LCD 2 Board

Hardware .......................................................... 17

See

PICDEM LCD 2 Board.

PICDEM LCD 2 Demo Board..................................... 6

PICDEM LCD 2 Hardware (Graphic) ......................... 7

PICDEM LCD 2 Kit.

PICDEM LCD 2 Stand-Alone Board........................... 9

Power Supply...................................................... 9

PICDEM LCD2 Board

Power Supply.................................................... 37

Processors ............................................................... 19

See

Push Buttons.

Switches.

Board.

See

Kit Components.

R

Reading, Recommended ........................................... 3

Real-Time Clock....................................................... 35

RS-232 ................................................................. 6, 35

S

Sample Devices ......................................................... 7

Sample PIM................................................................ 5

Sample Programs .................................................. 5, 7

Serial EEPROM ....................................................... 35

Switches..................................................................... 6

Analog Input...................................................... 36

Digital I/O .......................................................... 36

T

Temperature Sensor ................................................ 36

Thermometer............................................................ 11

U

Using the Demo Software ........................................ 11

V

Voltmeter.................................................................. 11

W

WWW Address........................................................... 3

© 2007 Microchip Technology Inc. DS51662A-page 51

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12/08/06

DS51662A-page 52 © 2007 Microchip Technology Inc.