MCP46XX
PICtail™ Plus
Daughter Board
User’s Guide
© 2009 Microchip Technology Inc.
DS51804A
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and may be superseded by updates.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
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OTHERWISE, RELATED TO THE INFORMATION,
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conveyed, implicitly or otherwise, under any Microchip
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Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
PICSTART, rfPIC, SmartShunt and UNI/O are registered
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
FilterLab, Linear Active Thermistor, MXDEV, MXLAB,
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, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, In-Circuit Serial
Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, nanoWatt XLP,
PICkit, PICDEM, PICDEM.net, PICtail, PIC32 logo, PowerCal,
PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, Select
Mode, Total Endurance, TSHARC, 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.
© 2009, 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 design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
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.
DS51804A-page ii
© 2009 Microchip Technology Inc.
MCP46XX PICTAIL™ PLUS
DAUGHTER BOARD USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 1
Introduction............................................................................................................ 1
Document Layout .................................................................................................. 1
Conventions Used in this Guide ............................................................................ 2
Recommended Reading........................................................................................ 3
The Microchip Web Site ........................................................................................ 3
Customer Support ................................................................................................. 3
Document Revision History ................................................................................... 3
Chapter 1. Product Overview
1.1 Introduction ..................................................................................................... 5
1.2 What is the MCP46XX PICtail™ Plus Daughter Board? ................................ 6
1.3 What the MCP46XX PICtail™ Plus Daughter Board Kit includes .................. 7
Chapter 2. Installation and Operation
2.1 Introduction ..................................................................................................... 9
2.2 Features ......................................................................................................... 9
2.3 Getting Started ............................................................................................. 10
2.4 MCP46XX PICtail™ Plus Daughter Board Demos ....................................... 14
Appendix A. Schematic and Layouts
A.1 Introduction .................................................................................................. 27
A.2 Schematics and PCB Layout ....................................................................... 27
A.3 Board - Schematic ..................................................................................... 28
A.4 Board – Top Silk-Screen Layer .................................................................... 29
A.5 Board – Top Components and Silk-Screen .............................................. 30
A.6 Board – Ground Layer ................................................................................. 31
A.7 Board – Power Layer ................................................................................... 32
A.8 Board – Bottom Layer
.............................................................................. 33
Appendix B. Bill Of Materials (BOM)
B.1 Bill Of Materials (BOM) ................................................................................ 35
Appendix C. Board Testing
C.1 Introduction .................................................................................................. 37
C.2 What is Tested ............................................................................................. 38
C.3 What is Not Tested ...................................................................................... 38
Worldwide Sales and Service .................................................................................... 40
© 2009 Microchip Technology Inc.
DS51804A-page iii
MCP46XX PICtail™ Plus Daughter Board User’s Guide
NOTES:
DS51804A-page iv
© 2009 Microchip Technology Inc.
MCP46XX PICTAIL™ PLUS
DAUGHTER 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.
For the most up-to-date information on development tools, see the MPLAB® IDE on-line help.
Select the Help menu, and then Topics to open a list of available on-line help files.
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP46XX PICtail™ Plus Daughter 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 MCP46XX PICtail™ Plus Daughter Board as
a development tool to emulate and debug firmware on a target board. The manual
layout is as follows:
• Chapter 1. “Product Overview” – Important information about the MCP46XX
PICtail™ Plus Daughter Board.
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with this user’s guide and a description of the user’s guide.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the MCP46XX PICtail™ Plus Daughter Board.
• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the
MCP46XX PICtail™ Plus Daughter Board.
• Appendix C. “Board Testing” – Describes the testing method for the MCP46XX
PICtail™ Plus Daughter Board and which aspects of the board are tested and
which are not.
© 2009 Microchip Technology Inc.
DS51804A-page 1
MCP46XX PICtail™ Plus Daughter Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Represents
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
Italic Courier New
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
Constants
A variable argument
Square brackets [ ]
Optional arguments
Curly brackets and pipe
character: { | }
Ellipses...
Choice of mutually exclusive
arguments; an OR selection
Replaces repeated text
#define START
autoexec.bat
c:\mcc18\h
_asm, _endasm, static
-Opa+, -Opa0, 1
0xFF, ‘A’
file.o, where file can be
any valid filename
mcc18 [options] file
[options]
errorlevel {0|1}
Initial caps
Quotes
Underlined, italic text with
right angle bracket
Bold characters
N‘Rnnnn
Text in angle brackets < >
Courier New font:
Plain Courier New
Represents code supplied by
user
DS51804A-page 2
Examples
File>Save
Press <Enter>, <F1>
var_name [,
var_name...]
void main (void)
{ ...
}
© 2009 Microchip Technology Inc.
Preface
RECOMMENDED READING
This user's guide describes how to use the MCP46XX PICtail™ Plus Daughter Board.
Other useful documents are listed below. The following Microchip documents are
available and recommended as supplemental reference resources.
AN1080 Application Note, “Understanding Digital Potentiometer Resistor
Variations”, DS01080
These data sheets provide detailed information regarding the MCP41XX/42XX product
family:
MCP453x/455x/463x/465x Data Sheet, “7/8-Bit Single/Dual I2C Digital POT with
Non-Volatile Memory“, DS22107
MCP454x/456x/464x/466x Data Sheet, “7/8-Bit Single/Dual I2C Digital POT with
Volatile Memory“, DS22096
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
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 (April 2009)
• Initial Release of this Document.
© 2009 Microchip Technology Inc.
DS51804A-page 3
MCP46XX PICtail™ Plus Daughter Board User’s Guide
NOTES:
DS51804A-page 4
© 2009 Microchip Technology Inc.
MCP46XX PICTAIL™ PLUS
DAUGHTER BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
The MCP46XX PICtail™ Plus Daughter Board demonstrates the features and abilities
of Microchip’s MCP45XX and MCP46XX Digital Potentiometers. This board is
designed to exclusively use the MCP46XX devices.
The MCP45XX and MCP46XX are digital potentiometers with an I2C interface. These
devices have either 7 bits or 8 bits of resolution, single or dual offering, and are
available as either volatile or non-volatile memory options.
This board is designed to easily operate with any of the following:
• Explorer 16 Development Board (DM240001)
• PICkit™ Serial Analyzer (DV164122)
• Other PICDEM Demo Board that includes a PICtail Plus female connector
The use of the Explorer 16 Development Board (DM240001) will require a tool to
program the supplied firmware into the PIC24FJ128GA010 device. The use of any
other PICDEM Demo Board will require the user to modify the supplied “C” source
program appropriately.
The use of the PICkit Serial Analyzer will require the PC GUI interface program to
control the command and data sent to the MCP42XX devices serial port. The PICkit
Serial Analyzer GUI may be used.
This chapter covers the following topics:
• What is the MCP46XX PICtail™ Plus Daughter Board?
• What the MCP46XX PICtail™ Plus Daughter Board Kit includes.
© 2009 Microchip Technology Inc.
DS51804A-page 5
MCP46XX PICtail™ Plus Daughter Board User’s Guide
1.2
WHAT IS THE MCP46XX PICTAIL™ PLUS DAUGHTER BOARD?
The MCP46XX PICtail™ Plus Daughter Board is used to demonstrate the use of digital
potentiometers. This board is designed to be used in conjunction with either the
Explorer 16 Development Board or the PICkit™ Serial Analyzer. Figure 1-1 shows the
board’s components placement and the purpose of the jumpers.
The board has an MCP4261-103 (10 kΩ ) device for evaluation. This device is in the
TSSOP package (U2). This is a dual 8-bit Non-Volatile Potentiometer device. The
MCP4661 uses an I2C interface and can be controlled via the PICkit Serial Analyzer
interface (J1) or via the PICtail Plus interface (J3).
When using the PICtail Plus interface, the HVC voltages can be taken to a VIHH level
for high voltage commands. This is done by controlling the selection of the analog
switch device (U1).
Jumpers allow the Terminal A and Terminal B voltages to be tied to AVDD and VSS, or
come from an external source.
Selects source
of Terminal A0
Voltage. Either
AVDD or VA0
PICkit Serial
Analyzer
Interface (I2C)
Selects source
of Terminal B0
Voltage. Either
AVSS or VB0
Selects source
of Terminal A1
Voltage. Either
AVDD or VA1
Not Installed
Selects source
of Terminal B1
Voltage. Either
AVSS or VB1
Connects
Wipers
(W0 and W1)
to PIC24 Analog
Inputs
Connects
Explorer 16
+5V signal to
AVDD signal
FIGURE 1-1:
DS51804A-page 6
MCP46XX Explorer 16 Daughter Board Demo Board Connectors.
© 2009 Microchip Technology Inc.
Product Overview
Some of the features of the board include:
• PICkit Serial Analyzer Interface (J1)
• PICtail Plus Interface (J3)
• MAX4582L High Voltage analog switch to allow HVC voltage to be selected as
one of four voltages (VSS, 3.3V, 5.0V, or 9.0V) - High Voltage command support
• Jumpers (JP2:JP3) to connect Wiper pins (W0 and W1) to the PICDEM Analog
Channels
• Jumper (JP1) to allow AVDD to be driven by external power supply while
connected to the PICDEM board or the PICkit Serial Analyzer
• Jumpers to allow Terminal A pins to be connected to the AVDD or VAx pad
• Jumpers to allow Terminal B pins to be connected to the VSS or VBx pad
• Connection point for easy connection to the Resistor Network Terminal pins
1.3
WHAT THE MCP46XX PICTAIL™ PLUS DAUGHTER BOARD KIT INCLUDES
This MCP46XX PICtail™ Plus Daughter Board Kit includes:
• One MCP46XX PICtail™ Plus Daughter Board, 102-00182
• Important Information “Read First”
© 2009 Microchip Technology Inc.
DS51804A-page 7
MCP46XX PICtail™ Plus Daughter Board User’s Guide
NOTES:
DS51804A-page 8
© 2009 Microchip Technology Inc.
MCP46XX PICTAIL™ PLUS
DAUGHTER BOARD USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP46XX PICtail™ Plus Daughter Board is used to demonstrate the operation of
digital potentiometers. The operation of the MCP45XX devices is similar to the
MCP46XX devices. Therefore, the MCP46XX PICtail™ Plus Daughter Board can be
used as a development platform for either device family.
The MCP46XX PICtail™ Plus Daughter Board is designed to be used in conjunction
with either the Explorer 16 Development Board or the PICkit™ Serial Analyzer.
2.2
FEATURES
The MCP46XX PICtail™ Plus Daughter Board supports the following features:
• Each digital potentiometer’s Terminal A pin can be individually connected to either
AVDD or the corresponding VAx pad
• Each digital potentiometer’s Terminal B pin can be individually connected to either
AVSS or the corresponding VBx pad
• It can control the voltage on the MCP4661’s HVC/A0 pin to either VSS, 3.3V, 5.0V,
or 9.0V via control signals from the PICtail Plus interface (J3)
• It can control the MCP4661 via the PICkit™ Serial Analyzer interface (J2)
• PIC24 can monitor the voltage levels of the MCP4661’s W0 and W1 pins
• It is supplied with a “C” program that demonstrates normal and high voltage
commands
• It demonstrates a split rail application, with digital logic at 3.3V and analog
operation at 5.0V
© 2009 Microchip Technology Inc.
DS51804A-page 9
MCP46XX PICtail™ Plus Daughter Board User’s Guide
2.3
GETTING STARTED
Figure 2-1 shows a simplified circuit for the MCP46XX PICtail™ Plus Daughter Board.
The layout of the board is shown in Figure 2-3. This board can be operated with either
a PICDEM board with a PICtail Plus header or the PICkit Serial Analyzer. The
MCP46XX PICtail™ Plus Daughter Board kit comes with firmware for the Explorer 16
Starter Kit (DV164033). The layout of this board is shown in Figure 2-5.
The MCP46XX PICtail™ Plus Daughter Board supports the following Microchip Digital
Potentiometer devices, which allows demonstration of all MCP46XX devices. The
board has the footprint for the following devices:
• MCP46X1
JP1
AVDD VSS
R1
PICVDD
(+5.0V)
VSS
AVDD
C1
MCP4661
(TSSOP)
VSS
VA0
JMP1
RAB0
C2
AVDD
R2
R4
R3
R6
R5
VW0
R7
JMP2
CS0
RB2 (CS0)
VSS
SDI
SDI
SDO
SDO
AVDD
SCK
SCK
WP
RF0 (WP)
JMP3
RAB1
SHDN
RF1 (SHDN)
SDA2
VW1
JMP4
SCL2
JP2
RB0/AN0
CS
VDD
VSS
SDI2
SCK2
SDO2
VW0
VW1
RB1/AN1
PIC
Explorer 16
Interface
JP3
(To SDO)
(To SCK)
(To SDI)
Connector
Orientation
Notch
H2 (PICkit Serial Interface)
FIGURE 2-1:
DS51804A-page 10
RB2
SCK1
SDI1
SDO1
VSS
AN0
H1 (PICkit Serial Interface)
NC
VDD
VSS
SDA
SCL
NC
VB0
VA1
RB3/AN3
VSS
RE9
1
VSS
2
RF2
RF3
SCL1
RB2
SDA1
CS0
RD14
RD15
VSS
AN1
RB4/AN4
VSS
RE8
RD14
+3.3V
+5.0V
+9.0V
RD15
+3.3V
+5.0V
+9.0V
RG0
RG1
RG9
SCK2
SDI2
RF0
RF1
RF4
RF5
SCL2
SDO2
SDA2
VSS
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
VSS
SPI Name
CS
SCK
SDI
VSS
P1B
P1W
P1A
P0A
P0W
P0B
WP
SHDN
SDO
VDD
VSS
VSS
VB1
MAX4582L
VDD
Y
A
B
C
EN
+9.0V
Y0 +5.0V
Y1 +3.3V
Y2 VSS
Y3 +9.0V
I2C Name
HVC/A0
SCL
SDA
VSS
PICkit Serial 6-Pin Interface
P1B
Pin # SPI Name I2C Name
P1W
6
SDO
—
P1A
5
SCK
SCL
P0A
4
SDI
SDA
P0W
3
VSS
VSS
P0B
2
VDD
VDD
WP
1
CS
—
A2
A1
VDD
MCP46XX PICtail™ Plus Daughter Board Simplified Circuit.
© 2009 Microchip Technology Inc.
Installation and Operation
2.3.1
The Hardware
Figure 2-2 shows the component placement of the MCP46XX PICtail™ Plus Daughter
Board as well as the operation of the board jumpers.
The VAx and VBx pads allow an external voltage source to be applied to the device’s
desired Terminal A or Terminal B pin. The VWx pad is directly connected to the
corresponding Terminal W pin, which makes it easy to measure the resulting voltage.
The AVDD pad allows an external power supply to power the board, which should
improve performance compared to powering the board via the PICtail Plus header or
the PICkit Serial Analyzer.
The Printed Circuit Board (PCB) has been designed for the support of the SPI and I2C
device families (MCP42XX and MCP46XX), so not all components are installed to
support the operation of the SPI version of the MCP46XX PICtail™ Plus Daughter
Board.
2.3.1.1
JUMPER DESCRIPTIONS
Figure 2-2 shows the function of the MCP46XX PICtail™ Plus Daughter Board
jumpers. Some of the jumpers configure the voltage source of the Terminal A and
Terminal B pins while others determine the connection of the W pins. Lastly, there is a
jumper to ensure that drive conflicts do not occur if an external power supply is being
used for the AVDD voltage.
The default jumper configuration for the shipped MCP46XX PICtail™ Plus Daughter
Board is shown in Figure 2-3.
© 2009 Microchip Technology Inc.
DS51804A-page 11
MCP46XX PICtail™ Plus Daughter Board User’s Guide
JMP1:JMP3 Terminal A Source
VAx Pad
JMP2:JMP4 Terminal B Source
AVDD
VBx Pad
JP3 - PIC24 AN1 pin
VSS
AN1 connected to W1
AN1 not connected
JP2 - PIC24 AN0 pin
FIGURE 2-2:
DS51804A-page 12
JP1 - Explorer 16 5V signal to AVDD plane
AN0 connected to W0
Explorer 16 5V signal connected to
MCP46XXDM-PTPLS AVDD plane
AN0 not connected
Explorer 16 5V signal not connected to
MCP46XXDM-PTPLS AVDD plane
MCP46XXDM-PTPLS Jumper Configuration and Oscilloscope Test Points.
© 2009 Microchip Technology Inc.
Installation and Operation
FIGURE 2-3:
MCP46XX PICtail™ Plus Daughter Board Layout with Default Jumper Settings
Note:
2.3.2
This is the jumper configuration that the board should be shipped with.
The Firmware
The supplied PIC24FJ128A010 firmware is written in 'C' for the Microchip 'C' Compiler.
The program is written using Microchip's released I2C library routines.
There are two program modes of operation, determined by the state of the S3 switches
after a device reset. Program one will generate a saw wave on Wiper 1 pin (VW1), while
program two will allow the user to control the value of the Wiper 1 register with the S4
and S6 switches. If it is desired to save that setting, the S5 switch can be depressed to
copy the value in the Volatile Wiper 1 register to the Non-Volatile Wiper 1 register. So
on any POR/BOR event the volatile Wiper 1 register will be loaded with the value of the
non-volatile Wiper 1 register.
© 2009 Microchip Technology Inc.
DS51804A-page 13
MCP46XX PICtail™ Plus Daughter Board User’s Guide
2.4
MCP46XX PICTAIL™ PLUS DAUGHTER BOARD DEMOS
This section describes how to demonstrate the MCP46XX PICtail™ Plus Daughter
Board. The demos will either use an Explorer 16 Development Board or a PICkit Serial
Analyzer.
The demo using the Explorer 16 Development Board is discussed in
Section 2.4.1 “Demos with the Explorer 16 Development Board”, while the demo
using the PICkit Serial Analyzer is discussed in Section 2.4.2 “Demo with the PICkit
Serial Analyzer”.
Note:
2.4.1
Both demos require that the MCP46XXDM-PTPLS board jumper settings
are as shown in Figure 2-4.
Demos with the Explorer 16 Development Board
Note:
For information on how to use the MPLAB-IDE, ICD-2, or any other aspect
of the PIC Development tool platform, please refer to the appropriate
documentation.
This demo will use the Explorer 16 Development Board. This board needs to be
programmed with the supplied firmware. This firmware can be downloaded from the
Microchip web site. It is a good practice to check the Microchip web site for updates to
the demo firmware.
The supplied firmware program has two modes of operation. In the first mode, the
program generates a saw wave on the VW1 pin (see Figure 2-6). The second mode is
to display the operation of High Voltage commands to Wiper 1 (see Figure 2-7). This is
where the CS signal is driven to 9V.
The program selected is determined after a reset (including the Power-on reset) by the
state of the S3 switch. The programs are:
• Wiper 1 Saw Wave (Switch S3 not depressed)
• Increment / Decrement with High Voltage Write to Non-Volatile Wiper 1 Register
(Switch S3 depressed)
Table 2-1 shows the required hardware to operate the demo.
TABLE 2-1:
Item # Description
Comment
1
Explorer 16 Development Board and power supply
(DV164033)
Note 1
2
MCP46XXDM-PTPLS
—
3
4-Channel oscilloscope
Note 2
Note 1:
2:
DS51804A-page 14
DEMO HARDWARE REQUIREMENTS
A development tool to program the Explorer 16 Development Board is required.
This development tool could be Microchip’s MPLAB ICD-2.
An oscilloscope with fewer channels can be used, but this will require that the
probes be moved between signals to verify the output states. A 2-channel
oscilloscope is the minimum requirement, but it is not recommended.
© 2009 Microchip Technology Inc.
Installation and Operation
2.4.1.1
THE MCP46XXDM-PTPS JUMPER CONFIGURATION
Before inserting the board into the Explorer 16 Development Board, the jumper
configuration must be verified. Figure 2-4 shows the configuration of the jumpers.
Channel 1
Channel 2
Channel 3
Channel 4
FIGURE 2-4:
MCP46XXDM-PTPLS Jumper Configuration and Oscilloscope Test Points.
Note:
© 2009 Microchip Technology Inc.
This is the jumper configuration that the board should be shipped with.
DS51804A-page 15
MCP46XX PICtail™ Plus Daughter Board User’s Guide
2.4.1.2
MCP46XX PICTAIL™ PLUS DAUGHTER BOARD (MCP46XXDM-PTPLS)
INTO THE EXPLORER 16 STARTER KIT (DV164033)
Figure 2-5 shows the component placement on the Explorer 16 Development Board
including the PICtail Plus header that the MCP46XX PICtail™ Plus Daughter Board is
inserted into. The board’s Reset switch and other switches are pointed out.
Ensure that the MCP46XXDM-PTPLS is installed in the correct orientation into the
Explorer 16 Development Board. Figure 2-5 shows the location where the daughter
board is inserted into the Explorer 16 Development Board.
Explorer 16
Development
Board reset
switch
Connector
(female) for
MCP46XXDMPTPLS board
Jumper J2 connects
LEDs to ground.
Disconnect jumper
for I2C operation.
S3 (RD6)
Switch State
selects program
at POR or after
MCLR reset
FIGURE 2-5:
DS51804A-page 16
M
S6 (RD7)
Increment Volatile Wiper1
S4 (RD13)
Decrement Volatile Wiper1
S5 (RA7)
Read Volatile Wiper1, then
Write Non-Volatile Wiper1
Explorer 16 Development Board (DV164033).
© 2009 Microchip Technology Inc.
Installation and Operation
2.4.1.3
DEMO STEPS
The Explorer 16 Development Board firmware contains two programs. The program
selected is determined after a reset (including the Power-on reset) by the state of the
S3 switch. The programs are:
1. Wiper 1 Saw Wave (Switch S3 not depressed).
2. Increment / Decrement with High Voltage Write to Non-Volatile Wiper 1 Register
(Switch S3 depressed).
Table 2-2 shows the sequence of steps to demonstrate the MCP46XXDM-PTPLS
board with the Explorer 16 Development Board.
Figure 2-6 shows the expected output waveform for Program #1 (Wiper 1 Saw Wave)
as well as the voltage levels and ranges of the four signals. Figure 2-7 shows an
example waveforms for the High Voltage Write Command for the SDA, SCL, and HVC
signals.
TABLE 2-2:
Step
DEMO STEPS USING THE PICDEM HPC EXPLORER DEMO
BOARD
Action
Result
1a
Turn on the oscilloscope and configure it as
follows:
• Channel 1, 2, 3, and 4 @ 5V/Division
• Channel 1 to 4 have the same ground
reference point
—
1b
Configure the oscilloscope as follows:
• Time-base = 10 ms/Division
(see Figure 2-6 for scope details)
—
2a
Configure the MCP46XXDM-PTPLS to the
jumper settings shown in Figure 2-4.
—
2b
On the Explorer 16 Development Board,
remove the shunt on JP2 (near the indicator
LEDs).
The LEDs are disabled (no longer
connected to ground).
3
Insert the MCP46XXDM-PTPLS board into the
Explorer 16 Development Board J5 header
(see Figure 2-5). Ensure proper orientation of
Daughter Board to J5 Header.
—
4
Connect the oscilloscope probes as follows:
• Channel 1 to the CS Pin of Header J1
(HVC signal of MCP4661)
• Channel 2 to the SDA Pin of Header J2
• Channel 3 to the SCL Pin of Header J2
• Channel 4 to the VW1 Pad
—
5
Power up the programmed Explorer 16
Development Board and depress and release
the MCLR push button.
Program 1 is now selected.
Output waveform should look similar
to Figure 2-6. Ensure to verify
voltage levels/ranges of the four
signals.
(Note 1)
6
Depress the Explorer 16 Development Board’s
S3 push button.
—
7
Depress and release the Explorer 16
Development Board’s MCLR push button.
—
Note 1:
© 2009 Microchip Technology Inc.
The SDA and SCL signals go from VSS to approximately 3.3V due to the PIC24
operating at 3.3V. The VW1 signals go from VSS to approximately 5V.
DS51804A-page 17
MCP46XX PICtail™ Plus Daughter Board User’s Guide
TABLE 2-2:
Step
Action
Result
8
Release the Explorer 16 Development Board’s
S3 push button.
Program 2 is now selected.
9
Configure oscilloscope as follows:
• Time-base = 100 µs/Division
(see Figure 2-7 for scope details)
—
10
Depress the Explorer 16 Development Board’s
S6 push button.
While S6 is depressed, the voltage
on Wiper 1 (VW1) increases.
11
Depress the Explorer 16 Development Board’s
S4 push button.
While S4 is depressed, the voltage
on Wiper 1 (VW1) decreases.
12
Use the S4 and S6 push buttons to configure
the Volatile Wiper 1 register to either near VDD
or near VSS. Take note of Wiper Voltage value.
—
14
Configure Scope to Capture on Channel 2.
—
15
Depress the Explorer 16 Development Board’s
S5 push button.
While S5 is depressed, the volatile
Wiper 1 register is read, this value is
written to the Non-Volatile Wiper 1
register, and then approximately a
10 ms delay occurs while the NV
write cycle occurs. Capture will look
similar to Figure 2-7. (Note 1)
16
Unplug Power from the Explorer 16
Development Board.
—
17
Depress the Explorer 16 Development Board’s
S3 push button.
—
18
Power up the programmed Explorer 16
Development Board and depress and release
the MCLR push button.
—
19
Release the Explorer 16 Development Board’s
S3 push button.
The voltage on the Wiper 1 pad
(VW1) should be the same voltage
level as when Step 12 is completed.
20
Unplug Power from the Explorer 16
Development Board and remove the
MCP46XXDM-PTPLS board.
—
Note 1:
DS51804A-page 18
DEMO STEPS USING THE PICDEM HPC EXPLORER DEMO
BOARD (CONTINUED)
The SDA and SCL signals go from VSS to approximately 3.3V due to the PIC24
operating at 3.3V. The VW1 signals go from VSS to approximately 5V.
© 2009 Microchip Technology Inc.
Installation and Operation
FIGURE 2-6:
Screen Capture of Program 1 Output Waveforms.
FIGURE 2-7:
Screen Capture of Program 2 Non-Volatile Write Waveform.
© 2009 Microchip Technology Inc.
DS51804A-page 19
MCP46XX PICtail™ Plus Daughter Board User’s Guide
2.4.2
Demo with the PICkit Serial Analyzer
Note:
For information on how to use the PICkit Serial Analyzer, or any other
aspect of the PIC® Development tool platform, please refer to the
appropriate documentation.
This demo requires that you have previously installed the PICkit Serial Analyzer
(DV164122) on your computer.
Note:
The GUI available for the MCP42XXDM-PTPLS (SPI version) will be
updated to support the I2C devices. After the program is updated, this
section’s description will be updated.
This GUI will be supplied “As Is”, but the source code is supplied to allow
developers a starting point for any GUI development.
TABLE 2-3:
DEMO HARDWARE REQUIREMENTS
Item # Description
Comment
1
PC with USB port running Windows XP
2
PICkit Serial Analyzer Adapter (DV164122)
3
MCP46XXDM-PTPLS
—
—
—
4
Oscilloscope
Note 1
Note 1:
A Digital Multi-Meter (DMM) may be used to measure the W pins voltage.
Figure 2-8 shows the PICkit Serial Analyzer GUI after the program first starts. It is then
necessary to ensure that the proper communication mode is selected (I2C Master).
Modifing the Communication Mode is shown in Figure 2-9. The communication mode
then needs to be configured, and should have the settings as shown in Figure 2-10.
After the communication mode settings have been saved, it is necessary to set up the
I2C communication scripts. Figure 2-11 shows how to open the script builder window.
The default script builder window is shown in Figure 2-12. Figure 2-13 through
Figure 2-16 show four simple scripts to read or write to Wiper 1. Other scripts may be
created for your testing. The Transaction Window (see Figure 2-8) shows the status of
the executed script.
DS51804A-page 20
© 2009 Microchip Technology Inc.
Installation and Operation
FIGURE 2-8:
PICkit Serial Analyzer GUI 1st Window.
FIGURE 2-9:
Selecting Communication Mode.
© 2009 Microchip Technology Inc.
DS51804A-page 21
MCP46XX PICtail™ Plus Daughter Board User’s Guide
DS51804A-page 22
FIGURE 2-10:
Configuring Communication Mode.
FIGURE 2-11:
Opening Script Builder Window.
© 2009 Microchip Technology Inc.
Installation and Operation
FIGURE 2-12:
Default Script Builder Window.
FIGURE 2-13:
Write 1 Byte to Wiper 1 Script (MCP46W1W1P25).
© 2009 Microchip Technology Inc.
DS51804A-page 23
MCP46XX PICtail™ Plus Daughter Board User’s Guide
DS51804A-page 24
FIGURE 2-14:
Write 2 Bytes to Wiper 1 Script (MCP46W1W1P2575).
FIGURE 2-15:
Read 1 Byte from Wiper 1 Script (MCP46R1W1).
© 2009 Microchip Technology Inc.
Installation and Operation
FIGURE 2-16:
© 2009 Microchip Technology Inc.
Read 2 Bytes from Wiper 1 Script (MCP46R2W1).
DS51804A-page 25
MCP46XX PICtail™ Plus Daughter Board User’s Guide
NOTES:
DS51804A-page 26
© 2009 Microchip Technology Inc.
MCP46XX PICTAIL™ PLUS
DAUGHTER BOARD USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the schematic and layouts for the MCP46XX PICtail™ Plus
Daughter Board. Diagrams included in this appendix are:
•
•
•
•
•
•
A.2
Board - Schematic
Board - Top Silk-screen Layer
Board - Top Component Plus Silk-screen
Board - Ground Layer
Board - Power Layer
Board - Bottom Layer
SCHEMATICS AND PCB LAYOUT
A.3 “Board - Schematic” shows the schematic of the MCP46XX PICtail™ Plus
Daughter Board.
A.4 “Board – Top Silk-Screen Layer” shows the layout for the top layer of the
MCP46XX PICtail™ Plus Daughter Board. The layer order is shown in Figure A-1.
Top Layer
Ground Layer
Power Layer
Bottom Layer
FIGURE A-1:
© 2009 Microchip Technology Inc.
Layer Order.
DS51804A-page 27
MCP46XX PICtail™ Plus Daughter Board User’s Guide
BOARD - SCHEMATIC
M
A.3
DS51804A-page 28
© 2009 Microchip Technology Inc.
Schematic and Layouts
A.4
BOARD – TOP SILK-SCREEN LAYER
© 2009 Microchip Technology Inc.
DS51804A-page 29
MCP46XX PICtail™ Plus Daughter Board User’s Guide
A.5
BOARD – TOP COMPONENTS AND SILK-SCREEN
DS51804A-page 30
© 2009 Microchip Technology Inc.
Schematic and Layouts
A.6
BOARD – GROUND LAYER
© 2009 Microchip Technology Inc.
DS51804A-page 31
MCP46XX PICtail™ Plus Daughter Board User’s Guide
A.7
BOARD – POWER LAYER
DS51804A-page 32
© 2009 Microchip Technology Inc.
Schematic and Layouts
A.8
BOARD – BOTTOM LAYER
© 2009 Microchip Technology Inc.
DS51804A-page 33
MCP46XX PICtail™ Plus Daughter Board User’s Guide
NOTES:
DS51804A-page 34
© 2009 Microchip Technology Inc.
MCP46XX PICTAIL™ PLUS
DAUGHTER BOARD USER’S GUIDE
Appendix B. Bill Of Materials (BOM)
B.1
BILL OF MATERIALS (BOM)
This appendix contains the Bill Of Materials for the MCP46XX PICtail™ Plus Daughter
Board.
TABLE B-1:
Qty
BILL OF MATERIALS (BOM)
Reference
Description
Manufacturer
Part Number
1
C1
CAP .1UF 25V CERAMIC X7R 0805
Panasonic® - ECG
ECJ-2VB1E104K
1
C2
CAP 1.0UF 16V CERAMIC X7R 0805
Kemet® Electronics
C0805C105K4RACTU
1
J2
CONN HEADER 6POS .100 VERT TIN
Molex/Waldom®
Electronics Corp
22-28-4060
3
JP1, JP2, JP3
CONN HEADER 2POS .100 VERT TIN
Molex/Waldom
Electronics
22-03-2021
4
JMP1, JMP2,
JMP3, JMP4
CONN HEADER 3POS .100" STR TIN
Molex/Waldom
Electronics Corp
90120-0123
1
PCB
RoHS Compliant Bare PCB,
MCP4XXX PICTail Plus Daughter Board
Microchip Technology 104-00182
Inc.
1
R1
RES 100 OHM 1/8W 1% 0805 SMD
Panasonic - ECG
ERJ-6ENF1000V
8
R2, R5, R6, R7, RES 10.0K OHM 1/8W 1% 0805 SMD
R8, R9, R11,
R16
Panasonic - ECG
ERJ-6ENF1002V
2
R3, R4
RES 500 OHM 1/8W 1% 0805 SMD
Panasonic - ECG
ERJ-6ENF5000V
3
R12, R13, R17
RES 0.0 OHM 1/8W 5% 0805 SMD
Rohm
MCR10EZPJ000
1
U1
ANALOG MUX, DUAL, 4-CHANNEL,
CMOS, SSOP, 16PIN, PLASTIC
16-QSOP
Maxim
MAX4582LEEE
1
U2
MCP454X/456X/464X/466X, 7/8-Bit
Single/Dual I2C Digital POT with
Non-Volatile Memory
Microchip Technology MCP4661T-103E/ST
Inc.
12
VA0, VW0, VB0, PC TEST POINT COMPACT SMT
VA1, VW1, VB1,
VSS, AVDD
Note 1:
5016
The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM
used in manufacturing uses all RoHS-compliant components.
TABLE B-2:
Qty
Keystone
Electronics®
BILL OF MATERIALS — COMPONENTS NOT INSTALLED
Reference
Description
Manufacturer
Part Number
0
J1
DO NOT POPULATE
CONN HEADER 6POS .100 VERT TIN
—
—
0
R10, R14, R15,
R18
DO NOT POPULATE
—
—
Note 1:
The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM
used in manufacturing uses all RoHS-compliant components.
© 2009 Microchip Technology Inc.
DS51804A-page 35
MCP46XX PICtail™ Plus Daughter Board User’s Guide
NOTES:
DS51804A-page 36
© 2009 Microchip Technology Inc.
MCP46XX PICTAIL™ PLUS
DAUGHTER BOARD USER’S GUIDE
Appendix C. Board Testing
C.1
INTRODUCTION
The MCP46XX PICtail™ Plus Daughter Board can be used in multiple configurations.
Only a subset of these configurations are tested. The tests were performed with the
configuration shown in Figure C-1. The tested nodes are Channel 1 through Channel 4.
Other configurations, Pad connections, and circuit performance are not tested.
Channel 1
Channel 2
Channel 3
Channel 4
FIGURE C-1:
Tested Jumper Configuration and Test Points.
© 2009 Microchip Technology Inc.
DS51804A-page 37
MCP46XX PICtail™ Plus Daughter Board User’s Guide
C.2
WHAT IS TESTED
The following portions of the board are tested:
• MCP4661 (U2)
- U2 MCP4661 Pot 1 is tested in Potentiometer configuration.
• JMP3 (P1 – P2) - AVDD to P1A
• JMP4 (P1 – P2) - AVSS to P1B
• MAX4582 (U1)
- Y0 (5.0V), Y3 (9.0V), and Y2 (VSS) switching.
• Pads: VW1
C.3
WHAT IS NOT TESTED
The following portions of the board are NOT tested:
•
•
•
•
•
•
•
•
•
•
•
DS51804A-page 38
JMP1
JMP2
JMP3 (P2 – P3) - VA1 to P1A
JMP4 (P2 – P3) - VB1 to P1B
Jumpers: JP1, JP2, and JP3
MAX4582 (U1)
- Y1 (3.3V) switching.
J1: PICkit Serial Analyzer Interface (SPI)
J2: PICkit Serial Analyzer Interface (I2C)
Pads: VA0, VB0, VW0, VA1, VB1, AVDD, and VSS
Test Points: A0, B0, A1, and B1
Connections to unpopulated components
© 2009 Microchip Technology Inc.
Board Testing
NOTES:
© 2009 Microchip Technology Inc.
DS51804A-page 39
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03/26/09
DS51804A-page 40
© 2009 Microchip Technology Inc.