MICROCHIP Explorer 8 Instructions

Explorer 8 Development Board

User’s Guide

 2015-2016 Microchip Technology Inc. DS40001812B

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

YSTEM

CERTIFIED BY DNV

== ISO/TS 16949 ==

• 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and may be superseded by updates.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
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
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 unless otherwise stated.

Trademarks

The Microchip name and logo, the Microchip logo, dsPIC,
FlashFlex, flexPWR, JukeBlox, K
LANCheck, MediaLB, MOST, MOST logo, MPLAB,
OptoLyzer, PIC, PICSTART, PIC
SST, SST Logo, SuperFlash and UNI/O are registered
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.

The Embedded Control Solutions Company and mTouch are
registered trademarks of Microchip Technology Incorporated
in the U.S.A.

Analog-for-the-Digital Age, BodyCom, chipKIT, chipKIT logo,
CodeGuard, dsPICDEM, dsPICDEM.net, ECAN, In-Circuit
Serial Programming, ICSP, Inter-Chip Connectivity, KleerNet,
KleerNet logo, MiWi, MPASM, MPF, MPLAB Certified logo,
MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code
Generation, PICDEM, PICDEM.net, PICkit, PICtail,
RightTouch logo, REAL ICE, SQI, Serial Quad I/O, Total
Endurance, TSHARC, USBCheck, VariSense, ViewSpan,
WiperLock, Wireless DNA, 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.

Silicon Storage Technology is a registered trademark of
Microchip Technology Inc. in other countries.

GestIC is a registered trademark of Microchip Technology
Germany II GmbH & Co. KG, a subsidiary of Microchip
Technology Inc., in other countries.

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

© 2015-2016, Microchip Technology Incorporated, Printed in
the U.S.A., All Rights Reserved.

ISBN: 978-1-5224-0346-3

EELOQ, KEELOQ logo, Kleer,

32

logo, RightTouch, SpyNIC,

QUALITY MANAGEMENT S

DS40001812B-page 2  2015-2016 Microchip Technology Inc.

Microchip received ISO/TS-16949:2009 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC
devices, Serial 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.

®

MCUs and dsPIC® DSCs, KEELOQ

®

code hopping

EXPLORER 8 DEVELOPMENT BOARD

USER’S GUIDE

Table of Contents

Preface ...........................................................................................................................5

Chapter 1. Overview

1.1 Introduction ................................................................................................... 11

1.2 Development Kit Contents ............................................................................ 11

1.3 Explorer 8 Development Board .................................................................... 12

1.4 On-Board Jumper Configurations ................................................................. 13

1.5 Sample Devices ........................................................................................... 17

1.6 Sample Programs ......................................................................................... 17

Chapter 2. Getting Started

2.1 Explorer 8 with Preprogrammed Device ....................................................... 19

2.2 Board with PIM Attached Devices ................................................................ 21

2.3 Programming the Microcontrollers ............................................................... 21

2.3.1 Programming Requirements ...................................................................... 21

2.3.2 Opening the Program in MPLAB

2.3.3 Programming the Microcontroller .............................................................. 23

2.4 Connecting to Host PC for USB Communication ......................................... 24

2.4.1 USB-to-UART Interface ............................................................................. 25

2.4.2 USB-to-I2C Interface ................................................................................. 25

2.5 Powering the Board ...................................................................................... 26

2.5.1 External 9V Power Supply ......................................................................... 26

2.5.2 USB Power ................................................................................................ 26

2.6 Selecting Vdd Values ................................................................................... 27

2.6.1 Varying the Device Voltage ....................................................................... 27

2.6.2 Calculating other Vdd Values .................................................................... 27

®

X IDE ................................................... 22

Chapter 3. Tutorial Program

3.1 Tutorial Program Operation .......................................................................... 29

3.2 Source Code and Data Sheets ..................................................................... 31

Appendix A. Hardware Details

A.1 Hardware Elements ..................................................................................... 33

A.1.1 Processor Sockets .................................................................................... 33

A.1.2 Display ...................................................................................................... 33

A.1.3 Power Supply ............................................................................................ 33

A.1.4 Micro USB Port ......................................................................................... 34

A.1.5 Switches .................................................................................................... 34

A.1.6 Oscillator Options ...................................................................................... 34

A.1.7 Analog Input (Potentiometer) .................................................................... 34

A.1.8 ICD Connector .......................................................................................... 34

A.1.9 PICkit
A.1.10 PICtail
A.1.11 mikroBUS

 2015-2016 Microchip Technology Inc. DS40001812B-page 3

™

Connector .................................................................................... 34

™

and PICtail Plus Expansion Connectors ................................... 35

™

Connectors .......................................................................... 35

Explorer 8 Development Board User’s Guide

A.1.12 Pmod™ Connectors .................................................................................35

A.1.13 Configurable In-line Connector ................................................................35

A.1.14 LCD .........................................................................................................35

A.1.15 Sample Devices .......................................................................................36

A.2 Board Layout and Schematics ..................................................................... 37

Worldwide Sales and Service .....................................................................................41

DS40001812B-page 4  2015-2016 Microchip Technology Inc.

EXPLORER 8 DEVELOPMENT BOARD

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 website
(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 p age number. The numbering convention for the DS number is
“DSXXXXXXXXA”, where “XXXXXXXX” 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 online help files.

INTRODUCTION

®

IDE online help.

This chapter contains general information that will be useful to know before using the
Explorer 8 Development Board. Items discussed in this chapter include:

• Document Layout

• Conventions Used in this Guide

• Warranty Registration

• Recommended Reading

• The Microchip Website

• Development Systems Customer Change Notification Service

• Customer Support

• Document Revision History

DOCUMENT LAYOUT

This document describes how to use the Explorer 8 Development Board as a tool to
emulate and debug firmware on a target board. The document is organized as follows:

• Chapter 1. Overview

• Chapter 2. Getting Started

• Chapter 3. Tutorial Program

• Appendix A. Hardware Details

 2015-2016 Microchip Technology Inc. DS40001812B-page 5

Explorer 8 Development Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENT CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog

A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

Underlined, italic text with
right angle bracket

Bold characters A dialog button Click OK

N‘Rnnnn A number in verilog format,

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

Courier New font:

Plain Courier New Sample source code #define START

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

Square brackets [ ] Optional arguments mcc18 [options] file

Curly brackets and pipe
character: { | }

Ellipses... Replaces repeated text var_name [,

A menu path File>Save

A tab Click the Power tab

where N is the total number of
digits, R is the radix and n is a
digit.

Filenames autoexec.bat
File paths c:\mcc18\h
Keywords _asm, _endasm, static
Command-line options -Opa+, -Opa-
Bit values 0, 1
Constants 0xFF, ‘A’

Choice of mutually exclusive
arguments; an OR selection

Represents code supplied by
user

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[options]
errorlevel {0|1}

var_name...]

void main (void)
{ ...
}

®

IDE User’s Guide

DS40001812B-page 6  2015-2016 Microchip Technology Inc.

WARRANTY REGISTRATION

Please complete the enclosed Warranty Registration Card and mail it promptly.
Sending in the Warranty Registration Card entitles users to receive new product
updates. Interim software releases are available at the Microchip website.

RECOMMENDED READING

This user’s guide describes how to use the Explorer 8 Development Board. The
following documents are available and recommended as supplemental reference
resources.

Explorer 8 Development Board Layout and Schematic Quick Start Guide
(DS40001805)

This quick start guide provides a brief overview on the Explorer 8 Development Board’s
functionalities, features and capabilities.

MPLAB

This document provides all the necessary information on the MPLAB ICD 3 In-Circuit
Debugger’s operation, installation, general setup and tutorial details. The MPLAB ICD
3 is a cost-effective, high-speed hardware debugger/programmer developed by
Microchip for PIC

MPLAB
(DS50002085)

This user’s guide describes how to use the MPLAB REAL ICE In-Circuit Emulator as a
development tool to emulate and debug firmware on a target board, as well as how to
program devices. It provides details on the emulator’s operation, features,
troubleshooting, software, hardware reference and emulator accessories.

PICkit™ 3 In-Circuit Debugger/Programmer User’s Guide for MPLAB
(DS52116)

This user’s guide describes the PICkit 3 In-Circuit Debugger/Programmer’s operation,
usage, troubleshooting methods and hardware specifications. The PICkit 3 can be
implemented as a debugger or development programmer for Microchip PIC MCUs and
DSCs that are based on In-Circuit Serial Programming™ (ICSP™) and Enhanced
ICSP 2-wire serial interfaces.

®

ICD 3 In-Circuit Debugger User’s Guide (DS51766)

®

REAL ICE™ In-Circuit Emulator User’s Guide for MPLAB X IDE

®

microcontrollers and Digital Signal Controllers (DSCs).

Preface

®

X IDE

 2015-2016 Microchip Technology Inc. DS40001812B-page 7

Explorer 8 Development Board User’s Guide

THE MICROCH I P WEBSITE

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

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 website 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, assemblers, linkers

and other language tools. These include the MPLAB XC Compilers that support
all 8-, 16- and 32-bit PIC MCUs and dsPIC

• Emulators – The latest information on Microchip in-circuit emulators. This

includes the MPLAB REAL ICE In-Circuit Emulator.

• In-Circuit Debuggers – The latest information on the Microchip in-circuit

debuggers. This includes the MPLAB ICD 3 In-Circuit Debugger and the PICkit 3
In-Circuit Debugger.

• MPLAB

Integrated Development Environment for development systems tools which can
be run on Windows

• Programmers – The latest information on Microchip programmers. These include

the device (production) programmers MPLAB REAL ICE in-circuit emulator and
MPLAB ICD 3 in-circuit debugger, and the development (non-production)
programmer PICkit 3.

®

X IDE – The latest information on Microchip MPLAB X IDE, the

®

, Mac OS® and LINUX® operating systems.

®

DSCs.

DS40001812B-page 8  2015-2016 Microchip Technology Inc.

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

Customers should contact their distributor, representative or field application engineer
(FAE) for support. Local sales offices are also available to help customers.

Technical support is available through the website at:

http://www.microchip.com/support.

DOCUMENT REVISION HISTORY

Revision A (August, 2015)

Initial release of the document.

Revision B (March, 2016)

Updated schematics.

Preface

 2015-2016 Microchip Technology Inc. DS40001812B-page 9

Explorer 8 Development Board User’s Guide

NOTES:

DS40001812B-page 10  2015-2016 Microchip Technology Inc.

1.1 INTRODUCTION

EXPLORER 8 DEVELOPMENT BOARD

USER’S GUIDE

Chapter 1. Overview

The Explorer 8 Development Board is one of the latest development boards for
evaluating and demonstrating the capabilities and features of Microchip’s 8-bit PIC
MCUs. This board supports 8/14/20/28/40-pin DIP and 44/64/80-pin PIM-mounted PIC
MCUs.

This board is fully populated with two fixed and one variable power supply, a 16x2
Character LCD module, a pair of mikroBUS™ Click™ board headers to accommodate
a variety of plug-in modules, a pair of Digilent Pmod™ connectors, an in-line
completely configurable connector, PICtail™ connectors and a USB-to-serial/I
converter. The Explorer 8 is fully compatible with the MPLAB
MPLAB X v3.00 or later.

1.2 DEVELOPMENT KI T CON TEN TS

The Explorer 8 Development Board comes with the following:

• Explorer 8 Development Board (DM160228)

• Pre-programmed DSTEMP

• Micro USB cable

If the kit is missing any of these parts, please contact the nearest Microchip sales office
listed in the back of this publication.

The MPLAB X Integrated Development Environment (IDE) is a free, integrated
software tool set for application development and debugging. Compilers and other
board-compatible software and hardware tools can be purchased.

To download the MPLAB X IDE software and documentation, or get information on the
other tools, visit www.microchip.com/devtools.

2

®

Code Configurator and

C

®

 2015-2016 Microchip Technology Inc. DS40001812B-page 11

Explorer 8 Development Board User’s Guide

1.3 EXPLORER 8 DEVELOPMENT BOARD

The Explorer 8 Development Board has the following hardware features. Each
feature’s number corresponds to the number in Figure 1-1, showing the feature’s
location on the board:

2

1. MCP2221 USB-to-UART/I

2. 16x2 Character LCD (LCD1)

3. MCP23S17 I/O Expander for LCD Interface (U4)

4. Eight blue LEDs (D1 to D8).

5. Male header pins for attaching Plug-in-Modules (U1A)

6. Socket for attaching 40-pin PIC MCUs (J8)

7. Socket for attaching 28-pin PIC MCUs (J13)

8. Socket for attaching 8/14/20-pin PIC MCUs (J10)

9. mikroBUS headers for attaching mikroBUS compatible boards (J32 and J35)

10. Two push button switches for external stimulus (S1 and S2)

11. PICtail Expansion Connectors for PICtail Daughter Boards (J3, J5, J11 and J28)

12. PICtail Plus Card Edge Modular Expansion Connectors for PICtail Plus Daughter
Boards (J19)

13. Test Points for 5.0V (TP1 and TP7), 3.3V (TP6) and V_VAR (TP5). V_VAR is the
variable voltage and is equal to the device V

14. 20-pin in-line expansion connector (J33)

15. 8 MHz crystal for device external oscillator (Y1)

16. Digilent Pmod compatible connectors (J17 and J20)

17. 10 kΩ Potentiometer for analog inputs (R25)

18. Variable Power Indicator LED (D9)

19. 3.3V Power Indicator (LD2)

20. 5.0V Power Indicator (LD1)

21. 5.0V (U5), 3.3V (U1) and Variable (U2) power supplies

22. Barrel connector for 9V DC Supply (J1)

23. RJ11 connector for ICSP programming/debugging using REAL ICE and ICD 3
(J26)

24. 6-pin male header for ICSP programming/debugging using PICkit 3 (J12)

25. Push button switch on MCLR

26. Micro USB socket for USB communication and/or USB power (J18)

C serial converter (U3)

DD and its associated logic

for external Reset (S3)

DS40001812B-page 12  2015-2016 Microchip Technology Inc.

FIGURE 1-1: EXPLORER 8 DEVELOPMENT BOARD

1

2

3

4

6

7

8

9

10

11

12

13

14

15

16

17 18

19

20

22

23

24

21

25

26

5

SDA
SCL

RC3RB6

RC4RB4

SDASCL

1.4 ON-BOARD JUMPER CONFIGURATIONS

The Explorer 8 Development Board allows the user to connect or disconnect
components from PIC
associated jumpers. Table 1-1 and Figure 1-2 provide details and examples for these
connections.

TABLE 1-1: ON-BOARD JUMPERS DESCRIPTION AND SAMPLE

Label Jumper/s Description Configuration

MCU Interface to MCP2221 USB-to-I2C/UART Converter

1 J22 Pulls up the configured I2C SCL pin

2 J57 Connects the microcontroller I

J58 Connects the microcontroller I

3 J23 Connects the microcontroller I

MCU pins or from other on-board components through

CONFIGURATION

(see J57) and SDA pin (see J58).

pin to the MCP2221 SCL pin (see
Label 3).
E.g. RC3 is configured as the
microcontroller I

pin to the MCP2221 SDA pin (see
Label 3).
E.g. RC4 is configured as the
microcontroller I

and SDA pins to the MCP2221 SCL
and SDA pins, respectively.

2

C SCL pin.

2

C SDA pin.

(1)

2

C SCL

2

C SDA

2

C SCL

 2015-2016 Microchip Technology Inc. DS40001812B-page 13

Explorer 8 Development Board User’s Guide

RC7

RC5

RB5

J55

J53

RC6

RC4

RB7

J56

J54

LCD_RESET

J59

LED_D_EN

LED_B_EN

RC5

RD4

RD5

RC4

RD6

RC3

RC7

RG2

RB5

J27

J43

RC6

RG1

J34

J44

RB7

TABLE 1-1: ON-BOARD JUMPERS DESCRIPTION AND SAMPLE

CONFIGURATION (CONTINUED)

Label Jumper/s Description Configuration

4 J53, J55 Connects the microcontroller UART

RX pin to the MCP2221 TX pin.
E.g. RC7 is configured as the
microcontroller RX pin.

J54, J56 Connects the microcontroller UART

TX pin to the MCP2221 RX pin.

E.g. RC6 is configured as the

microcontroller TX pin.

MCU Interface to MCP23S17 I/O Expander

5 J60 Connects RB5 to the MCP23S17 I/O

Expander RESET pin.

J59 Connects RA2 to the MCP23S17 I/O

Expander Chip Select (CS) pin.

MCU Interface to the LEDs

(1)

6 J7 Connects LEDs D1 to D4 cathodes to

ground to provide a continuous LED
current path.

(1)

J21 Connects LEDs D5 to D8 cathodes to

ground to provide a continuous LED
current path.

MCU Interface to J32 mikroBUS™

(1)

7 J45 Connects the microcontroller SDO pin

to the J32 mikroBUS MOSI (SPI
Master Output Slave Input) pin.
E.g. RC5 is configured as the
microcontroller SDO pin.

J46 Connects the microcontroller SDI pin

to the J32 mikroBUS MISO (SPI
Master Input Slave Output) pin
E.g. RC4 is configured as the
microcontroller SDI pin.

J47 Connects the microcontroller SCK pin

to the J32 mikroBUS SCK (SPI Clock)
pin.
E.g. RC3 is configured as the
microcontroller SCK pin.

8 J27, J43 Connects the microcontroller RX pin to

the J32 mikroBUS UART RX pin.
E.g. RC7 is configured as the
microcontroller RX pin.

J34, J44 Connects the microcontroller TX pin to

the J32 mikroBUS UART TX pin.
E.g. RC6 is configured as the
microcontroller TX pin.

DS40001812B-page 14  2015-2016 Microchip Technology Inc.

TABLE 1-1: ON-BOARD JUMPERS DESCRIPTION AND SAMPLE

RC7

RC5

RB4

RC4

RB6

RC3

RC5

RC7

RC4

RC6

VCAPRA5

J4

VCAPRA4

J31

RA5

RA6

RA7

RA4

+5V+5V

+3.3V

J15 J16

+5V

+3.3V

J30

J14

V_VAR

CONFIGURATION (CONTINUED)

Label Jumper/s Description Configuration

MCU Interface to J35 mikroBUS

9 J48 Connects the microcontroller SDO pin

J49 Connects the microcontroller SDI pin

J50 Connects the microcontroller SCK pin

10 J41 Connects the microcontroller RX pin to

(1)

to the J35 mikroBUS MOSI (SPI
Master Output Slave Input) pin.
E.g. RC5 is configured as the
microcontroller SDO pin.

to the J35 mikroBUS MISO (SPI
Master Input Slave Output) pin.
E.g. RC4 is configured as the
microcontroller SDI pin.

to the J35 mikroBUS SCK (SPI Clock)
pin.
E.g. RC3 is configured as the
microcontroller SCK pin.

the J35 mikroBUS UART RX pin.
E.g. RC7 is configured as the
microcontroller RX pin.

J42 Connects the microcontroller TX pin to

the J35 mikroBUS UART TX pin.
E.g. RC6 is configured as the
microcontroller TX pin.

Other Connections and Interfaces

(1)

11 J4, J31 Connections depend whether RA5

and RA4 are configured as an I/O port
or as a VCAP pin.
E.g. RA5 is configured as an I/O port
while RA4 as a VCAP pin.

12 J37 Selects whether RA6 or the RA5 pin

be connected to the external 8 MHz
crystal (Y1).
E.g. The 8 MHz crystal is connected to
the MCU OSC2/RA5 pin.

13 J36 Selects whether RA7 or the RA4 pin

be connected to the external 8 MHz
crystal (Y1).
E.g. The 8 MHz crystal is connected to
the MCU OSC1/RA7 pin.

14 J15, J16 Option to power the Digilent Pmod

with 3.3V or 5V.
E.g. J17 Pmod
while J20 Pmod

is supplied with 5V

is supplied with 3.3V

15 J14, J30 Selects either 3.3V, 5.0V or a variable

voltage for the board’s supply
E.g. The board is supplied with 5V.

 2015-2016 Microchip Technology Inc. DS40001812B-page 15

Explorer 8 Development Board User’s Guide

USB

+5V

BRD

+5V

RB7

J52 J51

RA0

RB6

RA1

LCD_PWR

J24

1 2

3 4

5

6 7 8

9

10

11

12

1314

16

17

18

19

15

TABLE 1-1: ON-BOARD JUMPERS DESCRIPTION AND SAMPLE

CONFIGURATION (CONTINUED)

Label Jumper/s Description Configuration

16 J2 Selects whether to supply 5V power to

the board via USB or the output of the
5V regulator.
E.g. The board is USB-powered.

17 J51, J52 Connects the PGD and PGC pins of

the PICkit™ 3, ICD 3 or REAL ICE™
to the PIC
ICSPCLK, respectively for ICSP™
programming

®

MCU ICSPDAT and

18 J61 Connects the LCD V

DD pin to +5V

supply.

19 J24 To supply a regulated 3.3V output.

Note 1: Sample configurations only. Jumpers should always be disconnected for unused

interfaces and devices.

FIGURE 1-2: EXPLORER 8 DEVELOPMENT BOARD JUMPER LOCATIONS

DS40001812B-page 16  2015-2016 Microchip Technology Inc.

1.5 SAMPLE DEVICES

The Explorer 8 Development Board comes with a 40-pin DSTEMP.

1.6 SAMPLE PROGRAMS

The Explorer 8 Development Board demonstration program can be downloaded from
the Microchip website (www.microchip.com/explorer8). This Demo Code can be used
with the included sample device and with a REAL ICE (In-Circuit Emulator), MPLAB
ICD 3 (programmer/debugger) or with a PICkit 3 (programmer/debugger).The Demo
code was developed using the MPLAB Code Configurator (MCC). For more
information on MCC, visit www.microchip.com/mcc.

For a complete list of available sample programs, schematics and additional collateral
for the Explorer 8 Development Board, visit www.microchip.com/explorer8.

 2015-2016 Microchip Technology Inc. DS40001812B-page 17

Explorer 8 Development Board User’s Guide

NOTES:

DS40001812B-page 18  2015-2016 Microchip Technology Inc.

EXPLORER 8 DEVELOPMENT BOARD

USB

+5V

BRD

+5V

RA5

VCAP

LED_D_EN

+3.3V

+5V

LED_B_EN

RA7

RA4

Chapter 2. Getting Started

The Explorer 8 Demo Board is very flexible and may be used in a variety of ways. This
section provides the different configurations of the board, and the required tools and
equipment for each of them.

2.1 EXPLORER 8 WITH PREPROGRAMMED DEVICE

Several features of the Explorer 8 Demo Board can be demonstrated immediately by
following the steps listed below:

1. Place the preprogrammed DSTEMP on the 40-pin socket of the Explorer 8

Development Board.

2. Ensure that the jumpers are on their proper configuration as shown in Tab le 2- 1.

See Section 1.4 “On-Board Jumper Configurations” for jumper description

and location.

Note: The table contains only a list of jumpers that are required to be setup for

proper demonstration of the Explorer 8 Development Board using the
pre-programmed device. Jumpers not listed in the table will have no effect
on the demo program.

USER’S GUIDE

TABLE 2-1: JUMPER SETUP USING THE PRE-PROGRAMMED DEVICE

Jumper/s Description Configuration

J2 Power the board via USB

J4 Use RA5 as an I/O pin

J7 Use LEDs D4 through D1

J14 Use +5.0V Supply

J21 Use LEDs D8 through D5

J36 Connect the 8 MHz Crystal to the device OSC1

pin to function as primary oscillator

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Explorer 8 Development Board User’s Guide

RA5

RA6

RB7

RA0

RB6

RA1

RC4

RC6

J59

LCD_RESET

LCD_PWR

TABLE 2-1: JUMPER SETUP USING THE PRE-PROGRAMMED DEVICE

Jumper/s Description Configuration

J37 Connect the 8 MHz Crystal to the device OSC2

pin to function as primary oscillator

J51 For ICSP™ programming, connect the device to

the PGD pin of PICkit™ 3, ICD 3 or REAL ICE™

J52 For ICSP programming, connect the device to

the PGC pin of PICkit™ 3, ICD 3 or REAL ICE™

J54 For USB-to-UART communication

J59 To send data to the LCD

J60 To reset the MCP23S17 I/O Expander

J61 Power the LCD module

3. Apply power to the Explorer 8 Development Board using the Micro USB cable

that comes with the kit. See Section 2.6 “Selecting Vdd Values”.

The device can now be demonstrated using the tutorial program. See

Section 3.1 “Tutorial Program Operation”.

DS40001812B-page 20  2015-2016 Microchip Technology Inc.

2.2 BOARD WITH PIM ATTACHED DEVICES

The Explorer 8 Development Board can also be used to demonstrate PIM-mounted
8-bit PIC microcontrollers. A Plug-in-Module (PIM) enables the attachment of
44/64/80-pin devices to the board.

To attach a PIM, simply seat the PIM in the 84-pin, elevated male connectors as shown
in Figure 2-1.

FIGURE 2-1: 84-PIN HEADER FOR PLUG-IN-MODULE (PIM)

Make sure that the device mounted on the PIM is supplied with the appropriate voltage.

See Section 2.6 “Selecting Vdd Values” and Section 2.6.2 “Calculating other Vdd

Values” for supplies other than 5V and 3.3V.

Some PIMs also enable the board’s 5V output to be automatically reset to 3.3V.

For a list of microcontroller-compatible PIMs, go to www.microchip.com.

2.3 PROGRAMMING THE MICROCONTROLLERS

The Explorer 8 Development Board supports the ability to program a microcontroller
through multiple options.

This section discusses:

• Programming Requirements

• Opening the Program in MPLAB X IDE

• Programming the Microcontroller Using ICD 3, REAL ICE and PICkit 3

2.3.1 Programming Requirements

To reprogram a sample device, the following are required:

• Program source code – The sample code is pre-loaded on the device, but user

source code can be substituted. If this is done, the sample program can be
restored by downloading the MPLAB X project file available at the Microchip
website.

• An assembler or compiler – The source code must be assembled or compiled

into a hex file before it can be programmed into the device.

• A programmer – Once the code is in the hex file format, this device programs the

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

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Explorer 8 Development Board User’s Guide

In meeting these requirements, the following items are to be taken into consideration:

• Code development and debugging – The free MPLAB X IDE software

development tool includes a debugger and several other software tools as well as
a unified graphical user interface (GUI) for working with other Microchip and
third-party software and hardware tools.

• Assembler – The free MPLAB X IDE tool includes the MPASM™ assembler.

• Compiler – Microchip’s MPLAB

X IDE environment.

• Programmer – Microchip’s MPLAB In-Circuit Debugger (ICD) 3, PICkit 3 In-Circuit

Debugger/Programmer, or MPLAB REAL ICE In-Circuit Emulator can be used to
program the device and all are fully integrated for the MPLAB X IDE environment.

• The MPLAB

Code Configurator (MCC) – is Microchip’s new tool for developing
drivers and initializers featuring a very easy to use GUI. It is a free tool that inte­grates into MPLAB X, providing a very powerful development platform. For more
information on MCC go to (www.microchip.com/mcc)

The MPLAB X IDE and the XC8 Compiler can be downloaded from the Microchip
website.

For a list of tools compatible with PIC microcontrollers, see the Microchip Development
Tools website at www.microchip.com/devtools.

®

XC8 Compiler is fully integrated for the MPLAB

.

2.3.2 Opening the Program in MPLAB

The MPLAB X Integrated Development Environment (IDE) is a software program that
runs on Windows

®

, MAC OS® and Linux® to develop code for PIC microcontrollers and

®

X IDE

Digital Signal Controllers (DSC).

This section describes how to open the

Explorer_8_Demo_MCC.X project in MPLAB

X IDE.

1. Download the

Explorer_8_Demo_MCC project from Microchip’s Explorer 8 web

page (www.microchip.com/explorer8).

2. Launch the MPLAB X IDE application and select

Explorer_8_Demo_MCC.X >Open Project from the downloaded section. The

project file will appear on the

Projects area. If it is not the main project, set as

File>Open Project>

main project.

3. Right click.

Explorer_8_Demo_MCC.X >Set as main project.

4. If not already downloaded, download and install the MCC tool from the Plugins
repository. This is done by the following:

• Select Tools from the MPLAB X menu, then Plugins.

• Select the

Available Plugins tab and select the MPLAB Code Configurator

• Go through the install process.

5. Once installed, go to the Tools menu in MPLAB X, select Embedded then MPLAB
Code Configurator.

6. With MCC open, all the modules currently in the project used for the demo
application can be seen.

7. The device is now ready to be built and programmed.

The next section will describe how to load the program into the microcontroller.

DS40001812B-page 22  2015-2016 Microchip Technology Inc.

2.3.3 Programming the Microcontroller

J52

J51

RB6

RA1

RB7

RA0

J52

J51

RB6

RA1

RB7

RA0

Program the device using an ICD 3, REAL ICE or PICkit 3.

1. Connect the ICD 3 or REAL ICE as shown in Figure 2-2. For PICkit 3, see

Figure 2-3.

2. Setup the jumpers. In addition to the jumper settings listed in

Section 2.1 “Explorer 8 with PreProgrammed Device”, J51 and J52 should

also be configured. See Figure 2-2.

3. Power-up the Explorer 8 Development Board (see

Board”

4. Open the project on MPLAB X IDE (see

in MPLAB

5. Right click

).

Section 2.3.2 “Opening the Program

®

X IDE”).

Explorer_8_Demo_MCC.X >Properties. A pop-up window will appear

Section 2.5 “Powering the

as shown in Figure 2-4.

FIGURE 2-2: ICD 3 CONNECTION AND JUMPER CONFIGURATION

FIGURE 2-3: PICkit™ 3 CONNECTION AND JUMPER CONFIGURATION

 2015-2016 Microchip Technology Inc. DS40001812B-page 23

Explorer 8 Development Board User’s Guide

FIGURE 2-4: PROJECT PROPERTIES WINDOW IN MPLAB® X IDE

6. Select the XC8 compiler under the Compiler Tool chain, if not already selected.

7. Under Hardware Tool, click
connected programmer.

8. Click

9. To load the program to the DSTEMP device, click the

Apply, and then OK.

Device

icon.

ICD 3, REAL ICE or PICkit 3, depending upon the

Make and Program

2.4 CONNECTING TO HOST PC FOR USB COMMUNICATION

The Explorer 8 Development Board allows the device to communicate with a PC via
two interfaces: USB-to-UART and USB-to-I
Protocol Converter (MCP2221) is provided for this purpose. The MCP2221 supports
Windows
systems. Drivers can be downloaded from the Microchip website at

www.microchip.com/mcp2221.

After installing the MCP2221 driver, the board can now be connected to the host PC
through a USB cable provided in the Explorer 8 Development Board kit.

®

(XP and later versions), Linux® and Mac OS® (all versions) operating

2

C. An on-board USB 2.0 to I2C/UART

DS40001812B-page 24  2015-2016 Microchip Technology Inc.

2.4.1 USB-to-UART Interface

J54

RC4

RC6

The MCP2221 supports baud rates between 300 and 115200. It utilizes a set of
commands to read and set the UART parameters during operation. It only supports
eight Data bits, no Parity, and one Stop bit. The terminal program (e.g., Teraterm,
Realterm, etc.) must be configured with the same settings.

If the MCU is configured to communicate with the host PC via UART interface, jumpers
J53, J54, J55 and J56 must be setup properly. The tutorial program in the DSTEMP
implements the UART for MCU-to-PC communication. Figure 2-5 shows how to setup
the jumpers for the tutorial program. The MCU is configured for Transmit mode so only
J54 is utilized and the other jumpers are left disconnected.

FIGURE 2-5: SETUP FOR UART TRANSMIT MODE

The operating system searches for a driver once the Explorer 8 Development Board is
connected to the PC using the USB-to-UART interface. After a suitable driver is found,
the system creates an entry in the registry. The entry stores relevant information about
the USB-to-UART adapter, its driver and the associated COM port.

2.4.2 USB-to-I2C Interface

For the USB-to-I2C interface, the MCP2221 functions as an I2C Master to the PIC MCU
and uses USB HID (Human Interface Device) protocol for communication with a host
PC. A typical command exchange starts with a 64-byte packet that is written by the host
PC. Afterward, the PC reads the response USB-to-I
packet.

To use the Explorer 8 Development Board for I
J58 must be configured properly. See Labels 1, 2 and 3 of Table 1-1 for sample jumper
configurations.

2

C from the device as a 64-byte

2

C interface, jumpers J22, J23, J57 and

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Explorer 8 Development Board User’s Guide

J2

J

USB
+5V

BRD
+5V

9V DC

J2

USB
+5V

BRD
+5V

To PC

USB Port

2.5 POWERING THE BOARD

The Explorer 8 Development Board can be powered-up in two ways: External 9V DC
supply and USB power.

2.5.1 External 9V Power Supply

To power-up the board using an external 9V power supply:

• Plug the 9V power supply to a wall outlet.

• Connect the 9V power supply to the board through the barrel connector placed on

the lower left corner of the board.

• Place J2 in the position shown in Figure 2-6.

FIGURE 2-6: USING THE 9V EXTERNAL SUPPLY

One of the on-board regulators will reduce this voltage to 5V which can be measured
through Test Points TP1 and TP7. For 3.3V, the 5V output will be further reduced
through a 3.3V regulator. Make sure to attach J24 before measuring the 3.3V output at
TP6. The board also supports other voltage values through an adjustable voltage
regulator. The variable voltage can be measured through TP5. For more details on
varying the voltage values, see Section

Section 2.6 “Selecting Vdd Values”.

2.5.2 USB Power

The Explorer 8 Development Board can also be powered through USB. The board will
draw +5V power from a host device such as a PC by connecting a USB cable between
the on-board micro USB socket and the PC’s USB port. The micro USB cable is
included in the Explorer 8 Development Kit.

Figure 2-7 shows how to connect the USB cable to the micro USB socket and J2 setting

for USB-powered configuration.

FIGURE 2-7: USB-POWERED BOARD CONFIGURATION

DS40001812B-page 26  2015-2016 Microchip Technology Inc.

2.6 SELECTING VDD VALUES

J14

J30

+5V

+3.3V

ADJ+V

J14

J30

+5V

+3.3V

ADJ+V

J14

J30

+5V

+3.3V

ADJ+V

V_VAR = 5V

(Fixed)

V_VAR = 3.3V

(Fixed)

V_VAR = ADJ + V

REF

(Variable)

V

OUT

V

REF

1

R2
R1

------ -+





I

ADJ

R2+=

V

OUT

1.25V 1

R2
R1

------ -+





=

Where:

R2 R20 R102



R20 R102
R20 R102+

----------------------------------==

R1 R19 R101



R19 R101
R19 R101+

----------------------------------==

The Explorer 8 Development Board is capable of supplying 5V, 3.3V and variable
supply voltages between 1.2 and 5V through dedicated on-board regulators. The
variable supply voltage, called V_VAR (also equal to V
and the on-board components.

2.6.1 Varying the Device Voltage

Figure 2-8 shows the jumper configuration for the three voltage settings.

FIGURE 2-8: JUMPER CONFIGURATION FOR DIFFERENT DEVICE

2.6.2 Calculating other VDD Values

DD), is used to power the device

VOLTAGES

For voltages other than 5V and 3.3V, jumpers J14 and J30 must be configured for
variable supply as shown in Figure 2-8. Other V

DD values can be produced by the

LM317 adjustable voltage regulator by populating the PIM board’s R101 and R102 with
different value resistors. This section discusses how to calculate alternate values for
these resistors. For detailed information, see the LM317 data sheet.

Note: R101 and R102 are named R1 and R2, respectively, in other PIM boards.

These must not be confused with the R1 and R2 values discussed in this
section.

EQUATION 2-1: LM317 REGULATOR VOLTAGE OUTPUT

IADJ is minimized by the LM317 and can be neglected or assumed to be zero. VREF is
the reference voltage developed by the LM317 between the output and adjustment
terminal, and is typically equal to 1.25V.

Therefore, the equation can be rewritten as shown in Equation 2-2.

EQUATION 2-2: CALCULATING THE LM317 OUTPUT VOLTAGE

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Explorer 8 Development Board User’s Guide

The Explorer 8 Development Board’s R20 and R19 resistors have their default values
of 1 kΩ and 330Ω, respectively. Without R102 and R101 being inserted in parallel on
the PIM board, V

To calculate a desired V

1. Solve for R2, given R1 = R19 = 330Ω.

2. Now knowing R2 and R20, solve for R102.

3. Determine the nearest available resistor value for R102 and recalculate the
resulting V_VAR to make sure it does not exceed the maximum V
being used.

For devices that are not mounted on a PIM but need a supply voltage other than 5V or

3.3V, external resistors may be connected to the ADJ pin of J29. A resistor connected

between ADJ and ground is equivalent to R102 and a resistor connected between ADJ
and V_VAR is equivalent to R101. Calculate the resistor values using the equations
previously discussed in this section.

OUT = 1.25V(1 + 1 kΩ/330Ω) = 5.04V.

OUT:

DD for the part

DS40001812B-page 28  2015-2016 Microchip Technology Inc.

EXPLORER 8 DEVELOPMENT BOARD

Power Up

Microchip

Explorer 8 Demo

Voltmeter

S1=Now S2=Next

Volts = x.xxV

S1=Exit

Toggle LEDs

S1=Now S2=Next

LEDs Toggle

S1=Exit

LED Dimming

S1=Now S2=Next

Turn POT R25

S1=Exit

Chapter 3. Tutorial Program

The tutorial program is preprogrammed into the DSTEMP that comes with the Explorer
8 demo board. This program, which can be downloaded from the Microchip website
(www.microchip.com/explorer8), is built using the MPLAB X IDE and the MPLAB
Complier. It also utilizes the macros, drivers and initializers generated by the MPLAB
Code Configurator (MCC). MCC is a plug-in for MPLAB X IDE that generates
seamless, easy to understand drivers and initializers that are inserted into your project.
For more information on MCC, visit www.microchip.com/mcc.

3.1 T UTORIAL PROGRAM OPERATION

The tutorial program consists of three components: Voltmeter, LED Toggle and LED
dimming. The flowchart in Figure 3-1 illustrates the button navigation through the entire
program.

The different components are displayed on the LCD and the LEDs. The data sent to the
LCD is simultaneously transmitted by the EUSART module of the device to the
USB-to-UART/I
through a serial terminal program (see

Communication”

8-bit Data, No Parity and 1 Stop Bit. For the board supply and jumper configurations,
see

Section 2.1 “Explorer 8 with Pre-Programmed Device”.

2

C converter and can, therefore, be viewed on the host PC monitor

). Make sure that the terminal program is configured to 9600 Baud,

USER’S GUIDE

XC8

®

Section 2.4 “Connecting to Host PC for USB

FIGURE 3-1: TUTORIAL PROGRAM FLOWCHART

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Explorer 8 Development Board User’s Guide

To select menu options, use the S1 and S2 buttons on the board (see Figure 3-2).

FIGURE 3-2: BUTTON SWITCHES FOR MENU SELECTION

When the board is powered up, a “Microchip Explorer 8 Demo” text is displayed on the
LCD and sent to the serial terminal as well. After a few seconds, the program proceeds
to the first component.

1. Voltmeter

This mode uses the Analog-to-Digital Converter (ADC) module to measure the voltage
across the R25 potentiometer and display a value between 0.00V and 5.00V on the
LCD. (In general, the displayed value is between 0.00V to V_VAR).

FIGURE 3-3: VOLTMETER DISPLAY AND COMPONENT

The voltage reading is updated continuously until the mode is exited by pressing S1.

FIGURE 3-4: VOLTAGE DISPLAY

2. LEDs Toggle

This mode toggles LEDs D1 and D2 alternately with D3 and D4 between fully On and
fully Off states every 100 milliseconds.

FIGURE 3-5: LED TOGGLE DISPLAY

DS40001812B-page 30  2015-2016 Microchip Technology Inc.

3. LED Dimming

Both the Complementary Output Generator (COG) and Analog-to-Digital Converter
(ADC) modules are implemented in this mode. The COG produces a pulse-width
modulated output whose duty cycle is determined by the measured ADC value across
the R25 potentiometer. The COG output controls the brightness of the D6, D7 and D8
LEDs.

FIGURE 3-6: LED DIMMING DISPLAY

Turning the potentiometer clockwise increases the brightness of the LEDs while
rotating it counterclockwise dims the LEDs.

FIGURE 3-7: LED DIMMING

Exiting this mode by pressing S1 brings the program back to Voltmeter.

3.2 SOURCE CODE AND DATA SHEETS

The tutorial program is available on the Microchip website:

(www.microchip.com/explorer8)

The source codes and hex files are contained in the
project file.

For information on reprogramming the device with new or modified code, see

Section 2.3 “Programming the Microcontrollers”.

Explorer_8_Demo_MCC.X

 2015-2016 Microchip Technology Inc. DS40001812B-page 31

Explorer 8 Development Board User’s Guide

NOTES:

DS40001812B-page 32  2015-2016 Microchip Technology Inc.

Appendix A. Hardware Details

A.1 HARDWARE ELEMENTS

A.1.1 Processor Sockets

The Explorer 8 Development Board contains four processor sockets:

• 20-pin Socket – for 8/14/20-pin DIP microcontrollers

• 28-pin Socket – for 28-pin DIP microcontrollers

• 40-pin Socket – for 40-pin DIP microcontrollers

• 84-pin PIM Socket – for 44/64/80-pin PIM-mounted microcontrollers

Only one device may be used at a time. Remove unnecessary devices before
demonstrating your program.

For a complete list of 8-bit PIC microcontrollers and available PIMs, go to the Microchip
website at www.microchip.com.

A.1.2 Display

Eight blue LEDs (D8:D1) are connected to the <RB3:RB0> and <RD3:RD0> pins of
each processor type, respectively. These pins are set high to light the LEDs.

LEDs D8:D5 may be disconnected by removing jumper J21 while LEDs D4:D1 may be
disconnected by removing J7.

D5 lights up once J21 is attached because RB0 is also connected to switch SW1 and
this pin is always pulled up to V_VAR.

EXPLORER 8 DEVELOPMENT BOARD

USER’S GUIDE

A.1.3 Power Supply

The Explorer 8 Development Board does not come with a power supply but it comes
with a micro USB cable for powering the board via USB. Using USB power, however,
limits the supply to only 100 mA. Using the 9V external supply, both 3.3V and 5.0
supplies are capable of up to 1A. Microchip’s 9V, 1.3A power supply (Part Number
AC002014) can be used if external supply is needed. When using an external supply,
the board is limited to a maximum of 5A, imposed on the breadboard contacts.

The board is populated with two fixed (U5 and U1) and one variable (U2) voltage
regulators to provide 5.0V, 3.3V and any voltage between 1.2V and 5V.

Note: For power supply selection, see Section 2.5 “Powering the Board” and

Section 2.6 “Selecting Vdd Values”.

 2015-2016 Microchip Technology Inc. DS40001812B-page 33

Explorer 8 Development Board User’s Guide

A.1.4 Micro USB Port

A micro USB port is provided not just for powering the board but also for
communications between the device and a host PC via USB. The micro USB cable
included in the Explorer 8 Development Board Kit can be used to connect the board’s
micro USB port to the host PC’s USB port.

The on-board MCP2221 is a USB-to-UART/I
connectivity for devices with UART or I

Note: For details on this connection, see Section 2.4 “Connecting to Host PC

for USB Communication”

A.1.5 Switches

Three switches are provided on the board:

• S1 – Active-low switch connected to RB0

• S2 – Active-low switch connected to RA5

• S3 – MCLR

When pressed, the switches are grounded. When idle, they are pulled high (V_VAR).

to hard reset the processor

A.1.6 Oscillator Options

2

C serial converter that enables USB

2

C interfaces.

.

An 8 MHz crystal (Y1) serves as the controller’s primary oscillator. It can also be used
as TMR0’s clock source for some devices depending upon the configured J36 and J37
settings.

A.1.7 Analog Input (Potentiometer)

A 10 kΩ potentiometer (R25) is connected through a series resistor to RA0/AN0.

The potentiometer can be adjusted from V_VAR to GND to provide an analog input to
one of the device ADC channels.

A.1.8 ICD Connector

The MPLAB® ICD 3 can be connected to the modular connector (J26) for programming
and in-circuit debugging. Jumpers J51 and J52 define the connection of the in-circuit
debugger to the device pins. The MPLAB REAL ICE can also be connected to this
interface.

Note: For details, see Section Section 2.3.3 “Programming the

Microcontroller”

.

A.1.9 PICkit™ Connector

A PICkit 3 In-Circuit Debugger/Programmer can be connected to the 6-pin interface
provided by J12. Jumpers J51 and J52 define the connection of the PICkit3 to the
microcontroller pins.

Note: For details, see Section 2.4 “Connecting to Host PC for USB

Communication”

.

DS40001812B-page 34  2015-2016 Microchip Technology Inc.

A.1.10 PICtail™ and PICtail Plus Expansion Connectors

The PICtail interface enables the Explorer 8 Development Board to be connected
directly to available PICtail daughter board cards. The following female headers are
available to support different PIC microcontroller connections to PICtail daughter cards
and for user access to MCU pins:

• 2x14 Socket (J3) – to support 8/14/18/20/28-pin devices

• 2x6 Socket (J11) – to support up to 44-pin devices

• 2x10 Socket (J5) – to support up to 68-pin devices

• 2x8 Socket (J28) – to support up to 80-pin devices

The PICtail Plus connectors (J19) are the card-edge modular connector found on the
right part of the board. It is based on a 120-pin connection divided into three sections
of 30 pins, 30 pins and 56 pins. Each 30-pin section provides connections to all of the
serial communication peripherals, as well as many I/O ports, external interrupts and
ADC channels. This provides enough signals to develop many different expansion
interfaces for different PICtail daughter cards.

For available PICtail daughter cards, visit the Microchip website at

www.microchip.com.

A.1.11 mikroBUS™ Connectors

Two MikroElektronika Click boards may be loaded into the sockets J32 or J35. Various
communication ports and interfaces are controlled by Jumpers J41 through J50. Power
and ground for the Click boards is supplied through the existing connections to the
sockets.

Note: Sample jumper configurations are provided in Ta b le 1 - 1.

A.1.12 Pmod™ Connectors

Two Digilent Pmod interfaces are available on the bottom middle of the Explorer 8
Development Board. Both sockets are the 12-pin version of the Digilent Pmod and
provide eight I/O signal pins, two power pins and two ground pins. The signals are
arranged so that they provide two of the 6-pin interfaces stacked.

Note: Sample jumper configurations are provided in Ta b le 1 - 1.

A.1.13 Configurable In-line Connector

A 20-pin single in-line socket (J33) is provided for connection with expansion boards.
The socket is connected in parallel to the first line of a 2x20 female header (J25)
making it a configurable in-line connector. The second line of J25 has each of its pin
socket connected to the 3.3V supply while another 2x20 female header (J39) makes
each of its pin socket available with 5V.

A.1.14 LCD

An LCD with two lines, 16 characters each, is connected to the SPI I/O expander,
MCP23S17. The two control lines and eight data lines are connected to the I/O
expander. The I/O expander has an SPI interface that connects it to the microcontroller.
The LCD is disabled or enabled through jumper J61.

 2015-2016 Microchip Technology Inc. DS40001812B-page 35

Explorer 8 Development Board User’s Guide

A.1.15 Sample Devices

A sample part programmed with a simple program is included in the Explorer 8
Development Board Kit. The device’s I/O features and port connections are listed in

Table A-1.

TABLE A-1: SAMPLE DEVICE I/O FEATURES AND CONNECTIONS

Device LEDs USB S1 S2 S3 LCD

PIC16F1719 RB3:RB0

RD3:RD0

RC6 RB0 RA5 MCLR RC3

RC5
RA2
RB5

POT

R25

PICkit™

RA0 RB7

RB6

ICD/

Y1

RA7
RA6

DS40001812B-page 36  2015-2016 Microchip Technology Inc.

A.2 BOARD LAYOUT AND SCHEMATICS

FIGURE A-1: EXPLORER 8 DEVELOPMENT BOARD

4

2

3

1

1 1

2

3

1

2 2

2

3

1

4

2

13

9

14 12

11 10

3

1

0

0

0

8

7

1

9

1

0

2

3

4

0

5

0

0

0

1

2

3

4

5

6

6

10

5

11

4

2

12

3

1

13

2

14

1

1

1

2

21

2

1 2 1

3

3

2 1

2

1

3 2

1

2

1

2

2

2

3

2

1

1

1

2

2

1

1

2

1

2

2

1

1

1

1

2

2

3

3

2

1 2

21

1 2

12

2

4

6

1

21

1

2

1

3

2

1

3

2

1

1

5

2

1

3

21

1

2

231

3

2

2

1

1

1

2

2 1

1 2

21

1

2 1

2 1

3

2

1

12

3

2

1

2

1

2

211

7 6

4 3

8

2 1

1 2

2

1

28

2

27

3

26

1

4

25

5

24

6

23

7

22

8

21

9

20

1

2

10

19

11

18

12

17

13

16

14

15

2

1

83 80577 75 72169 67 64

84 82 81

79 78 76

1

1

2

3

4

5

6

7

8

9

10

11

2

12

13

1

14

15

16

17

18

19

20

2

21

23 26 29 31 34 37 39 42

252422 302827 38363533

1 2

1

2

1

2

2

1

2

1

2

1

2

3

73 71 70 68

74

2

2

32

2

16 15

212 2

2 2 2 2

2

1

1

1

1 1 1 1

1

2

2

2

212121212

1

1

1

2 1

2 1

66 65

63

62

61

60

59

58

57

56

55

54

53

52

2

51

1

50

49

48

47

46

45

44

1

43

4140

12

1 2

1

2

1 2

12

6

4

8

91011

5 3

3

16

1

2

3

4

5

6

7

33 3

1

2

2

121

1

1

2

1

1

2

2

3

1

2

1

1

2

2

1

1

3

2

2

1

3

3

1

1

2

2

12

3

3

127

7891011

1

2

3

4

1

5

2

6

3

7

4

8

5

9

6

10

7

11

8

12

9

1

2

13

10

14

11

15

12

16

13

17

14

18

19

20

6

4

5 123

40

39

38

37

28

36

27

35

26

34

25

1

33

24

2

32

23

3

1

2

31

22

4

30

21

5

29

20

6

28

19

7

27

18

8

26

17

9

25

16

10

24

15

23

22

21

40

36 34

38 32

39

35 33

37 31

40 36 34 30 28924 22 20816 1418

38 32826 12 6

39

35 33

37 31

20

1718

15

14

13

12

11

10

1

2

3

3

2

12

1

1

1

2

1

23

1

2

1

23

1

2 1

1 2

20

19

18

17

16

15

14

13

12

11

1

30 28

24 22 20

26

29 27

23 21 19

25

29 27

23 21 19

25 11 5

1415

1619

1

2

3

4

5

6

7

3

3

3

2

2

2

1

1

1

2 1

4 3

12

34

6 5

78

910

1112

1314

1516

18 17

20 19

2 1

4 3

56

8 7

10 9

12 11

14 13

16 15

161514

18

1098

12

6

1317

7

11 5

10 8 4 2

15 1317

9 7

101112

789

5 4

6 313

3

16

2

2

15

2

1

1

1

14

13

1 2

12

11

3 4

1

2

10

2

1

9

1 2

1

2

3 4

2

1

12

34

6 5

2 1

4 3

56

8 7

10 9

12 11

14 13

16 15

1718

202219

21

24 23

262825

27

2 1

4 3

56

8 7

10 9

12 11

432

1

3 1

12

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

34

36

38

40

42

44

46

48

50

52

54

56

58

60

62

66

68

70

72

74

76

78

80

82

84

86

88

90

92

94

96

98

100

102

104

106

108

110

112

114

116

118

120

1

1

1

 2015-2016 Microchip Technology Inc. DS40001812B-page 37

DS40001812B-page 38  2015-2016 Microchip Technology Inc.

1

FIGURE A-2: EXPLORER 8 DEVELOPMENT SCHEMATIC - 1

J3

1

RE2
RE3
RA7
RA6
RC7
RC6
RB7

80 - 84 pins

64 - 68 pins

RB6

40 - 44 pins

RB5
RB4
RB3
RB2
RB1

8 - 14 - 18 - 20 - 28 pins

RB0

2

RE2

4

RE3

6

RA7

8

RA6

10

RC7

12

RC6

14

RB7
RB6

16

RB5

18

RB4

20

RB3

22

RB2

24

RB1

26

RB0

28

HDR-2.54 Female 2x14

J11

MCLR

2

4

6

8

10

12

HDR-2.54 Female 2x6

J5

2

4

6

8

10

12

14

16

18

20

HDR-2.54 Female 2x10

J28

2

4

6

8

10

12

14

16

HDR-2.54 Female 2x8

RD1
RD3
RD5
RD7
RE1

RG1
RG3
RG5
RF1
RF3
RF5
RF7
RE5
RE7

TP8

TP LOOP Black TH

RJ1
RJ3
RJ5

RJ7
RH1
RH3
RH5
RH7

RA5

RA5

3

RA4

RA4

5

RA3

RA3

7

RC5

RC5

9

RC4

RC4

RC3

RC3

11

RA0

RA0

13

RA1

RA1

15

RA2

RA2

17

RC0

RC0

19

RC1

RC1

21

RC2

23

V_VAR

25

27

1

RD0RD1

3

RD2RD3

5

RD4RD5

7

RD6RD7

9

RE0RE1

V_VAR

11

1

RG0RG1

3

RG2RG3

5

RG4

7

RF0RF1

9

RF2RF3
RF4RF5

11

RF6RF7

13

RE4RE5

15

RE6RE7

17

V_VAR

19

1

RJ0RJ1

3

RJ2RJ3

5

RJ4RJ5

7

RJ6RJ7

9

RH0RH1
RH2RH3

11

RH4RH5

13

RH6RH7

15

RC2

RD0
RD2
RD4
RD6
RE0

RG0
RG2
RG4
RF0
RF2
RF4
RF6
RE4
RE6

RJ0
RJ2
RJ4
RJ6
RH0
RH2
RH4
RH6

TM

+9V

+9V

PIC tail

RSX101MM-30TR
J1

POWER 2.5mm

TP LOOP Red

TP7

J6

1

2

34

HDR-2.54 Female 2x2

J9

1

2

34

+5V

56

HDR-2.54 Female 2x3

D12

1
3
2

MICROSMD050F-2

VBUS

+5V

+3.3V

+3.3V

S1

1 4

2 3

TACT SPST

C5

0.01uF
50V
0603

V_VAR

D11

1

2

BAT54SLT1

LM340S-5.0/NOPB

C2

0.22uF

U5

VIN1VOUT

GND

2

+9V

C4

10uF
16V
0805

F1

D10

C17

C27

4.7uF
1000pF

25V

50V

AL-A

RB0

0603

S2

1 4

2 3

TACT SPST

R14

10k

SMBJP6KE6.8

R15

1k

D1

RD0

BLUE

D2

RD1

BLUE

D3

RD2

3

Shunt 2.54mm 1x2 Handle

@J2_1_2

3

C19

C3

0.1uF

0.01uF

25V

50V

0603

0603

TP LOOP Red

HDR-2.54 Male 1x3

TP1

Vusb5

J2

+5V +3.3V

1

2

3

C26

10uF
16V
0805

R36

470R
0805
5%

LD1

RED

+5V

TP2

TP LOOP Black TH

+5V

C43

0.1uF
25V
0603

1

MCP1826S/3.3V

U1

VIN

VOUT

GND

2

Shunt 2.54mm 1x2 Handle

J24

3

HDR-2.54 Male 1x2

C9

1uF
16V
0603

12

TP4

TP LOOP Red

TP6

+3.3V

+3.3V

R37

270R
0805
5%

LD2

YELLOW

@J24

BLUE

D4

RD3

BLUE

@J7

Shunt 2.54mm 1x2 Handle

D5

RB0

BLUE

D6

RB1

BLUE

D7

RB2

BLUE

D8

RB3

BLUE

R5

1k

R6

1k

R7

1k

R8

1k

R9

1k

R10

1k

R11

1k

R12

1k

J7

12

J21

12

Vusb5

C28

0.1uF
25V
0603

V_VAR

D9

GREEN

R13

1k

Power Indicator

SGND

V_VAR

1 3

V_VAR

1 3

R25A

10k

2

91A
20%

POT

R25

R26

10K

2

C24

1000pF
50V
0603

RA0

1k

V_VAR

R27

10k

R28

RA5

1k

Explorer 8 Development Board User’s Guide

 2015-2016 Microchip Technology Inc. DS40001812B-page 39

N

AN

1

2

3

5

6

60

59

58

5

56

55

1

1

1

1

1

1

1

1

FIGURE A-3: EXPLORER 8 DEVELOPMENT SCHEMATIC - 2

J50

1

RC3

2

3

RB6

HDR-2.54 Male 1x3

J26

123456

MCLR
V_VAR

PGD

PGC

MODULAR RJ25

J12

1

MCLR

2

V_VAR

3
4

PGD

5

PGC

6

HDR-2.54 Male 1x6

J49

11

RC4

2

3

RB4

HDR-2.54 Male 1x3

J48

1

RC5

2

3

RC7

HDR-2.54 Male 1x3

J47

1

RC3

2

3

RD6

HDR-2.54 Male 1x3

J46

1

RC4

2

3

RD5

HDR-2.54 Male 1x3

J45

1

RC5

2

3

RD4

HDR-2.54 Male 1x3

C6

0.1uF
25V
0603

AN1A

RA1

2

RST

RB7

3

CS

RA4

4

SCK

5

MISO

6

MOSI

7

+3.3V

8

GND

SGND SGND

mikroBUS

J35

1

RE0

AN

2

RST

RD7 RB0

3

CS

RE2

4

SCK

5

MISO

6

MOSI

7

+3.3V

8

GND

mikroBUS

J32

DNP

J51

@J51_1_2

1

RB7

2

3

RA0

Shunt 2.54mm 1x2 Handle

HDR-2.54 Male 1x3

J52

@J52_1_2

1

RB6

2

3

RA1

Shunt 2.54mm 1x2 Handle

HDR-2.54 Male 1x3

C25

0.1uF
25V
0603

V_VAR

S3

TACT SPST

Switch

PWM

GND

R18

10k

C18

0.1uF
25V
0603

SCL
SDA
+5V

INT

RX
TX

PWM

SDA

GND

R23

100R

16

R29

RC1

15
14
13
12

RC3

11

RC4

10

+5V+3.3V

9

16

R30

RC0

15

INT

14

RX

13

TX

12

SCL

RC3

11

RC4

10

+5V

+5V+3.3V +5V+3.3V

9

MCLR

HDR-2.54 Male 1x3

1k

RC7

RB1

RC5

RC6

+5V+3.3V

RC4

HDR-2.54 Male 1x3

1k

J36

1

@J36

2

3

Shunt 2.54mm 1x2 Handle

J41

1

2

V_VAR

3

J42

1

2

3

HDR-2.54 Male 1x3

J43

1

RC7

2

3

RG2

J44

1

RC6

2

3

RG1

HDR-2.54 Male 1x3

DNP

R21

C35

0.1uF
25V
0603

J27

1

RB5

HDR-2.54 Male 1x1

J34

1

RB7

HDR-2.54 Male 1x1

C36

0.1uF
25V
0603

10M

C15

22pF
50V
0603

8MHz

Y1

C16

22pF
50V
0603

RA4 RA5

C37

0.1uF
25V
0603

J37

1

2

3

RA6RA7

Shunt 2.54mm 1x2 Handle

@J37

J29

1

2

ADJ

3

V_VAR

HDR-1.27 Male 1x3

RJ0

RE2

RE3

RE4

RE5

RE6

RE7

C13

0.1uF
25V
0603

C14

0.1uF
25V
0603

MCLR

V_VAR

RH0

RH1

RD0

84

U1A

1

1

RH2

2

2

RH3

3

3

RE1

4

4

RE0

5

5

RG0

6

6

RG1

7

7

RG2

8

8

RG3

9

9

10

10

RG4

11

NC

12

11

13

12

14

13

RF7

15

14

RF6

16

15

RF5

17

16

RF4

18

17

RF3

19

18

RF2

20

19

RH7

21

20

RH6

2

2122222323242425252626

2728282929303031NC3231333234333534363537363837393840394140

RD1

RD2

RD3

RD4

V_VAR

74

73

71757276737774787579768077817882798380

NC

RD5

27

RF0

RF1

RH4

RH5

D13

2

LM317KTTR

U2

2

C30

0.1uF
25V
0603

VIN3VOUT

ADJ

1

ADJ

R20

1k

R19

330R

+9V

1

BAT54SLT1

C7

0.1uF
25V
0603

3

C31

1uF
16V
0603

HDR-2.54 Male 1x1

J14

J30

1

V_VAR

@J14_1_2

Shunt 2.54mm 1x2 Handle

TP5

HDR-2.54 Male 1x3

+5V

1

2

3

+3.3V

RA3

V_VAR

RA0

RA1

RA2

RA4

RA5

RC0

RC1

V_VAR

RJ1

RD6

RD7

65

2

616462

636664676568666967706871697270

TMS-121-01-G-S

63

60

RJ2

62

59

RJ3

61

58

RB0

60

57

7

RB1

59

56

RB2

58

55

RB3

57

54

RB4

56

53

RB5

55

52

RB6

54

51

53

NC

52

50

RA6

51

49

RA7

50

48

V_VAR

49

47

RB7

48

46

RC5

47

45

RC4

46

44

RC3

45

43

RC2

44

42

RJ7

43

41

RJ6

42

RJ4

RJ5

RC6

RC7

DS40001812B-page 40  2015-2016 Microchip Technology Inc.

VDD

G

G

UA

UA

GP2GP3

SDA

SC

VUS

D-

VSS

G

0

1

1

VSS

VDD

Vo

S

W

0

DB1

2

3

DB5

6

7

1

1

FIGURE A-4: EXPLORER 8 DEVELOPMENT SCHEMATIC - 3

Explorer 8 Development Board User’s Guide

@J61

Shunt 2.54mm 1x2 Handle

1 2

+5V

J61

40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22

LCD

RB7
RB6
RB5
RB4
RB3
RB2
RB1
RB0

V_VAR

RD7
RD6
RD5
RD4
RC7
RC6
RC5

RD3

R24

10k
0603
1%

R17

1.3k
0603

LCD1

6

E

E

5

R/W

R/

R/W

4

RS

RS

R

3

VEE

Vo

2

R31

10k
0603
1%

VDD

1

C38

VSS

0.1uF
LCM-S01602DTR/M

25V
0603

HDR-2.54 Female 2x6 RA

J17

1

2

RC0
RC1 RC2
RC7
RC6

RD4

3

4

RD5

5

6

RD6

7

8

RD7

9

10

12

11

+5V

HDR-2.54 Male 1x3

7

DB0

DB0

DB

8

DB1

DB1

9

DB2

DB2

DB

10

DB3

DB3

DB

11

DB4

DB4

DB4

12

DB5

DB5

13

DB6

DB6

DB

14

DB7

DB7

DB

HDR-2.54 Female 2x6 RA

J20

1

2

RD0

3

4

RC5
RC4
RC3

J15

1

2

3

+5V

J16

1

2

+3.3V+3.3V

3

RD1

5

6

RD2

7

8

RD3

9

10

12

11

HDR-2.54 Male 1x3

1

VBUS

2

D-

3

D+

4

ID

5

GND

0

USB Micro B TH/SMT

V_VAR

V_VAR
RA5/VCAP
RA4/VCAP

RC5
RC4

RC6
RC7

J18

VBUS
USB_N
USB_P

C20

0.1uF
25V
0603

1
2
3
4
5
6
7
8
9

10

110-91-320-41-001

MCP2221

V_VAR

UART_RX
UART_TX

RC5

RC7
RC4

RC6

C23

0.1uF
25V
0603

1
2
3
4
5
6

U3

J53

J55

1

HDR-2.54 Male 1x1

1

2

3

J56

1

HDR-2.54 Male 1x1

1

2

3

J54

J31

3

2

1

HDR-2.54 Male 1x3

C34

10uF
16V
0805

VDD
GP0

P0

GP1

P1

RST

RST
UART RX

RT RX

UART TX

RT TX

GP27GP3

RB5

RB7

MCLR

RA4/VCAP
RA5/VCAP

R1

10k

HDR-2.54 Male 1x3

HDR-2.54 Male 1x3

RA4/VCAP

C21

C22

0.1uF

0.1uF

25V

25V

0603

0603

J10

20
19

RA0

18

RA1

17

RA2MCLR

16

RC0

15

RC1

14

RC2RC3

13

RB5

12

RB4

11

RB6RB7

14

VSS

13

D+

12

D-

11

VUSB

B

10

SCL

L

9

SDA

8

@J53_2_3

Shunt 2.54mm 1x2 Handle

@J54_2_3

Shunt 2.54mm 1x2 Handle

J4

RA5

RA5/VCAPRA4

HDR-2.54 Male 1x3

C33

C32

0.1uF

0.1uF
25V

25V

0603

0603

J13

1
2

RA0

3

RA1

4

RA2

5

RA3

6
7
8
9

RA7

10

RA6

11

RC0

12

RC1

13

RC2
RC3 RC4

110-91-328-41-001

+3.3V

USB_P
USB_N

1 2

RB5

J60

@J60

Shunt 2.54mm 1x2 Handle

3

2

1

6.3V

0.47uF

C1

@J59

Shunt 2.54mm 1x2 Handle

V_VAR

1 2

RA2

J59

R33

10k
0603
1%

28

RB7

27

RB6

26

RB5

25

RB4

24

RB3

23

RB2

22

RB1

21

RB0

20

V_VAR

19
18

RC7

17

RC6

16

RC5

1514

J22

HDR-2.54 Male 2x2

J23

11 2

3 4

HDR-2.54 Male 2x2

RC3

R32

RC5

10k
0603
1%

V_VAR

C39

0.1uF
25V
0603

2.2kR22.2k

112

3 4

U4

12

SCK

13

SI

14

SO

11

CS

17

A2

16

A1

15

A0

A

18

RESET

20

INTA

19

INTB

9

VDD

10

VSS

MCP23S17

RA4/VCAP
RA5/VCAP

V_VAR

R16

HDR-2.54 Male 1x3

J57

1

RC3

2

3

RB6

1

RC4

2

3

RB4

HDR-2.54 Male 1x3

J58

21

GPA0

22

GPA1

23

GPA2

24

GPA3

25

GPA4

26

GPA5

27

GPA6

E

28

GPA7

RS

1

GPB0

PB0

DB0

2

GPB1

DB1

3

GPB2

DB2

4

GPB3

DB3

5

GPB4

DB4

6

GPB5

DB5

7

GPB6

DB6

8

GPB7

DB7

J8

1

MCLR

2

RA0

3

RA1

4

RA2

5

RA3

6
7
8

RE0

9

RE1

10

RE2

11

V_VAR

12
13

RA7

14

RA6

15

RC0

16

RC1

17

RC2

18

RC3 RC4

19

RD0

20 21

RD1 RD2

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