MCP2515 Stand-Alone CAN Controller PICtail Demo Board User's Guide

MCP2515 Stand-Alone
CAN Controller PICtail™
Demo Board User’s Guide
© 2005 Microchip Technology Inc.
DS51572A
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PRO MATE, PowerSmart, rfPIC, and SmartShunt are
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dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR,
FanSense, FlexROM, fuzzyLAB, In-Circuit Serial
Programming, ICSP, ICEPIC, Linear Active Thermistor,
MPASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM,
PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo,
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DS51572A-page ii
© 2005 Microchip Technology Inc.
MCP2515 PICtail™ DEMO
BOARD USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 1
Chapter 1. Product Overview ........................................................................................ 5
1.1 Introduction ..................................................................................................... 5
1.2 What is the MCP2515 PICtail™ Demo Board ? ............................................. 5
1.3 What the MCP2515 PICtail™ Demo Board Kit Includes ................................ 5
Chapter 2. Installation and Operation .......................................................................... 7
2.1 Introduction ..................................................................................................... 7
2.2 Features ......................................................................................................... 7
2.3 Getting Started ............................................................................................... 8
2.4 Firmware Description ..................................................................................... 8
Appendix A. Schematics and Layouts ...................................................................... 11
A.1 Introduction .................................................................................................. 11
Appendix B. Bill of Materials (BOM) .......................................................................... 15
Worldwide Sales and Service .................................................................................... 16
© 2004 Microchip Technology Inc.
DS51572A-page iii
MCP2515 PICtail™ Demo Board User’s Guide
NOTES:
DS51572A-page iv
© 2004 Microchip Technology Inc.
MCP2515 PICtail™
DEMO 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 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.
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP2515 PICtail™ Demo Board. Items discussed in this chapter include:
•
•
•
•
•
•
Document Layout
Conventions Used in this Guide
Recommended Reading
The Microchip Web Site
Customer Support
Document Revision History
DOCUMENT LAYOUT
This document describes how to use the MCP2515 PICtail™ Demo Board. The manual
layout is as follows:
• Chapter 1. “Product Overview” – Important information about the MCP2515
PICtail™ Demo Board.
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with this evaluation board.
• Appendix A. “Schematics and Layouts” – Shows the schematic and layout
diagrams for the MCP2515 PICtail™ Demo Board.
• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the
MCP2515 PICtail™ Demo Board.
© 2005 Microchip Technology Inc.
DS51572A-page 1
MCP2515 PICtail™ Demo Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Initial caps
Quotes
Underlined, italic text with
right angle bracket
Bold characters
N‘Rnnnn
Text in angle brackets < >
Represents
Examples
Referenced books
Emphasized text
A window
A dialog
A menu selection
A field name in a window or
dialog
A menu path
MPLAB® IDE User’s Guide
...is the only compiler...
the Output window
the Settings dialog
select Enable Programmer
“Save project before build”
A dialog button
A tab
A number in verilog format,
where N is the total number of
digits, R is the radix and n is a
digit.
A key on the keyboard
Click OK
Click the Power tab
4‘b0010, 2‘hF1
File>Save
Press <Enter>, <F1>
RECOMMENDED READING
For more information regarding the Stand-Alone Controller Area Network (CAN)
controller, CAN I/O Expander and CAN transceiver devices, refer to the appropriate
data sheet. Table 1 shows the device and associated Data Sheet (DS) literature
number. These documents can be downloaded from the Microchip web site at:
www.microchip.com.
TABLE 1: DEVICES AND DATA SHEET LITERATURE NUMBERS
Device
DS51572A-page 2
Literature #
Device
Literature #
MCP2515
DS21801
MCP2502X/5X
DS21664
MCP2551
DS21667
© 2005 Microchip Technology Inc.
Preface
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
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
DOCUMENT REVISION HISTORY
Revision A (August 2005)
• Initial release of this document.
© 2005 Microchip Technology Inc.
DS51572A-page 3
MCP2515 PICtail™ Demo Board User’s Guide
NOTES:
DS51572A-page 4
© 2005 Microchip Technology Inc.
MCP2515 PICtail™
DEMO BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
This chapter provides an overview of the MCP2515 PICtail™ Demo Board and covers
the following topics:
• What is the MCP2515 PICtail™ Demo Board?
• What the MCP2515 PICtail™ Demo Board kit includes
1.2
WHAT IS THE MCP2515 PICtail™ DEMO BOARD?
The MCP2515 PICtail™ Demo Board allows the system designer to quickly evaluate
the operation of the MCP2515 Stand-Alone CAN Controller. The board demonstrates
the MCP2515 in a CAN bus environment.
In addition, the kit includes an MCP25020 CAN I/O Expander node which
demonstrates the device on a CAN bus.
1.3
WHAT THE MCP2515 PICtail™ DEMO BOARD KIT INCLUDES
This MCP2515 PICtail™ Demo Board Kit includes:
• One MCP2515 PICtail™ Demo Board with two CAN nodes
- One node includes a PIC16F676, a MCP2515 CAN controller and a
MCP2551 transceiver.
- The other node includes a MCP25020 CAN I/O expander and an MCP2551
transceiver.
- The CAN nodes can be physically separated by snapping them apart at the
perforation.
• One power/bus cable for connecting the two PCB sections together
• MCP2515 Data Sheet (DS21801) (electronic version on CD)
• MCP2502X/5X Data Sheet (DS21664) (electronic version on CD)
• MCP2551 Data Sheet (DS21667) (electronic version on CD)
• MCP2515 PICtail™ Demo Board User’s Guide (DS21572)
(electronic version on CD)
© 2005 Microchip Technology Inc.
DS51572A-page 5
MCP2515 PICtail™ Demo Board User’s Guide
NOTES:
DS51572A-page 6
© 2005 Microchip Technology Inc.
MCP2515 PICtail™
DEMO BOARD USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
This chapter discusses the setup and operation of the MCP2515 PICtail™ Demo
Board.
The MCP2515 PICtail™ Demo Board is designed to demonstrate the MCP2515 and
MCP25020 as simple, low-cost CAN nodes. Both nodes monitor an input push button
and send CAN messages with the button condition at regular intervals. The CAN
message is received by the other node, where a LED is set to mirror the button state.
2.2
FEATURES
The MCP2515 PICtail™ Demo Board has the following features:
• Two (2) CAN nodes consisting of:
- Node A: MCP2515, PIC16F676 and a MCP2551 CAN transceiver.
- Node B: MCP25020 CAN I/O Expander and MCP2551 CAN transceiver.
• Each node also has one push button and one LED connected to the I/O.
- The push button state from each node is sent to the other node via a CAN
message.
• Two headers on Node A, used for programming the PICmicro® Microcontroller
Unit (MCU) using the programming features of the PICkit™ 1 Flash Starter Kit or
PICkit™ 2 Microcontroller Programmer. Neither header is populated. Refer to
Appendix A. “Schematics and Layouts”.
© 2005 Microchip Technology Inc.
DS51572A-page 7
MCP2515 PICtail™ Demo Board User’s Guide
2.3
GETTING STARTED
The MCP2515 PICtail™ Demo Board is a fully-functional, assembled and tested board
for evaluation of the MCP2515 Stand-Alone CAN controller in a simple CAN
environment. In addition, the MCP25020 CAN I/O Expander can be observed in
operation. The following describes the basic setup and operation (see Figure 2-1):
1. Either connect a power supply (5 V) using the VDD and GND test points, or plug
a 9V power supply or power adapter into the plug.
2. Observe that RXCAN, TXCAN, and INT LEDs flash at regular intervals.
3. Node A (MCP2515) samples its input (push button) and sends to Node B
instructing it to drive its LED to the input corresponding level of the switch.
4. Node A also requests Node B’s I/O status (push button) at the same interval and
driveits LED as required.
2.3.1
PICkit™ 1 Flash Starter Kit and PICkit™ 2 Microcontroller
Programmer Connections
The MCP2515 PICtail™ Demo Board has two headers (not populated), which allows
the PICkit™ 1 Flash Starter Kit or PICkit™ 2 Microcontroller Programmer to be used to
reprogram the PICmicro® MCU. Refer to the PICkit™ 2 Microcontroller Programmer
User’s Guide (DS51553) for more information on programming PICmicro MCUs.
FIGURE 2-1:
SETUP CONFIGURATION
Perforation
Node B
Node A
9V DC
Adapter
MCP2515 PICtail™ Eval Bd.
DS51572A-page 8
© 2005 Microchip Technology Inc.
Installation and Operation
2.4
FIRMWARE DESCRIPTION
See Figure 2-2 and Figure 2-3 for a simple firmware flow diagram for Node A (Node B
does not contain any firmware).
1. The firmware first configures the PIC16F676 and the MCP2515.
2. The firmware then checks a global flag bit to determine if a message needs to be
sent (a message containing the input button value is transmitted once every
224 ms).
2a. Node A sends a message to Node B requesting I/O status (i.e., push button
status).
3. The firmware checks a global receive flag bit to determine if a message has been
received by the MCP2515. If yes, the data is read and the LED is set accordingly.
4. The firmware loops back to #2.
FIGURE 2-2:
FIRMWARE FLOW DIAGRAM
Start
InitMCU
Init2515
ServiceIO
MAIN
© 2005 Microchip Technology Inc.
DS51572A-page 9
MCP2515 PICtail™ Demo Board User’s Guide
FIGURE 2-3:
SERVICE I/O FIRMWARE FLOW
START
This flag is set in the ISR
when Timer 0 times out 16
times (256 ms).
gSampleFlag?
A
=1
TX0D3<4> = 0
(TX0D3 = 0x00)
LED = ON
YES
RC1 = 0
Button
Pressed?
No
RC1 = 1
TX0D3<4> = 1
(TX0D3 = 0x10)
LED = OFF
SendMsg
TXB0
=0
This is the message that
requests the I/O status (i.e.,
push button status) from
Node B (MCP25020)
SendMsg
TXB1
Clear
gSampleFlag
This flag is set in the ISR for
the INT pin.
gRXFlag?
=0
A
RXMsg
RC2 = 0
OFF
LED Status?
(gLEDStatus)
ON
RC2 = 1
Clear gRXFlag
A
DS51572A-page 10
ServiceIO
© 2005 Microchip Technology Inc.
MCP2515 PICtail™
DEMO BOARD USER’S GUIDE
Appendix A. Schematics and Layouts
A.1
INTRODUCTION
This appendix contains the schematic and PCB layout for the MCP2515 PICtail™
Demo Board. Diagrams included:
•
•
•
•
Board Schematic – Sheet 1 of 2
Board Schematic – Sheet 2 of 2
Board – Top Layer (with silk-screen)
Board – Bottom Layer
© 2005 Microchip Technology Inc.
DS51572A-page 11
MCP2515 PICtail™ Demo Board User’s Guide
DS51572A-page 12
M
BOARD SCHEMATIC – SHEET 1 OF 2
MCP2515 CAN Controller PICtail™ Demo Board
FIGURE A-1:
© 2005 Microchip Technology Inc.
Schematics and Layouts
© 2005 Microchip Technology Inc.
M
BOARD SCHEMATIC – SHEET 2 OF 2
MCP2515 CAN Controller PICtail™ Demo Board
FIGURE A-2:
DS51572A-page 13
MCP2515 PICtail™ Demo Board User’s Guide
FIGURE A-3:
BOARD – TOP LAYER (WITH SILK-SCREEN)
FIGURE A-4:
BOARD – BOTTOM LAYER
DS51572A-page 14
© 2005 Microchip Technology Inc.
MCP2515 PICtail™
DEMO BOARD USER’S GUIDE
Appendix B. Bill of Materials (BOM)
TABLE B-1:
Qty
BILL OF MATERIALS (BOM)
Reference
Description
Manufacturer
®
Part Number
5
C3, C4, C5,
C7, C11
CAP .1 µF 16V CERAMIC X7R 0805
Panasonic - ECG
1
C6
CAP 1.0 µF 10V CERAMIC X7R 0805
Kemet®
2
C10, C13
CAP 10000PF 50V CERAMIC X7R 0805 Kemet
C0805C103K5RACTU
6
D1, D2, D4, D6,
D7, D8, D9
LED RED CLEAR 0805 SMD
Lite-On Trading USA
Inc
LTST-C170CKT
8
GND, GND1,
TP1, TP2, TP3,
TP4, TP4, VDD,
VDD1
PC TEST POINT COMPACT SMT
Keystone Electronics®
5016
2
J2, J3
CONN HEADER 10POS .100 VERT TIN
Molex®/Waldom®
Electronics Corp
10-88-1101
1
J4
CONN HEADER 6POS .100 VERT TIN
Molex/Waldom
Electronics Corp
22-28-4061
2
J5, J6
CONN HEADER 6POS .100 VERT TIN
Header Not Installed
Molex/Waldom
Electronics Corp
22-28-4062
2
JP1, JP2
CONN HEADER 2POS .100 VERT TIN
Molex/Waldom
Electronics Corp
22-28-4021
1
JP3
CONN HEADER 2POS .100 VERT TIN
Jumper Not Installed
Molex/Waldom
Electronics Corp
22-28-4022
1
P1
CONN HEADER 14POS .100 R/A TIN
Header Not Installed
Molex/Waldom
Electronics Corp
22-28-8140
7
R1, R2, R5, R11, RES 475 OHM 1/10W 1% 0805 SMD
R17, R19, R20
Panasonic - ECG
ERJ-6ENF4750V
1
R3
Yageo America
9C08052A1002FKHFT
2
R,6, R10
RES 510 OHM 1/8W 5% 0805 SMD
Panasonic - ECG
ERJ-6GEYJ511V
3
R12,R15,R18
RES 4.99K OHM 1/10W 1% 0805 SMD
Panasonic - ECG
ERJ-6ENF4991V
2
R16,R21
RES 121 OHM 1/10W 1% 0805 SMD
Panasonic - ECG
ERJ-6ENF1210V
3
SW1, SW2, SW5 SWITCH LT TOUCH 6X3.5 100GF SMD
Panasonic - ECG
EVQ-PJS04K
1
U1
Stand-alone Controller Area Network
(CAN) controller
Microchip
Technology Inc.
MCP2515-I/ST
1
U2
PIC® 14-Pin Flash-based 8-Bit CMOS
Microcontroller
Microchip
Technology Inc.
PIC16F676-I/SN
2
U3,U5
High-Speed CAN Transceiver
Microchip
Technology Inc.
MCP2551-I/SL
1
U4
CAN I/O Expander for a Controller Area
Network (CAN) system,
Microchip
Technology Inc.
MCP25020-I/SL
1
Y1,Y2
Resonator 16.0 MHZ Ceramic
Murata® Electronics
North America
CSTCE16M0V53-R0
RES 10.0K OHM 1/8W 1% 0805 SMD
© 2005 Microchip Technology Inc.
ECJ-2VB1C104K
C0805C105K8RACTU
DS51572A-page 15
WORLDWIDE SALES AND SERVICE
AMERICAS
ASIA/PACIFIC
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EUROPE
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Fax: 34-91-352-11-47
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Fax: 66-2-694-1350
Toronto
Mississauga, Ontario,
Canada
Tel: 905-673-0699
Fax: 905-673-6509
07/01/05
DS51572A-page 16
© 2005 Microchip Technology Inc.