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Summary of Contents for Microchip Technology MCP42XX
- Page 1 MCP42XX PICtail™ Plus Daughter Board User’s Guide © 2008 Microchip Technology Inc. DS51759A...
- Page 2 MPLAB, PIC, PICmicro, ensure that your application meets with your specifications. PICSTART, rfPIC and SmartShunt are registered trademarks MICROCHIP MAKES REPRESENTATIONS of Microchip Technology Incorporated in the U.S.A. and other WARRANTIES OF ANY KIND WHETHER EXPRESS OR countries. IMPLIED, WRITTEN ORAL,...
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Page 3: Table Of Contents
Chapter 1. Product Overview 1.1 Introduction ..................... 5 1.2 What is the MCP42XX PICtail Plus Daughter Board? ........6 1.3 What the MCP42XX PICtail Plus Daughter Board Kit includes ...... 7 Chapter 2. Installation and Operation 2.1 Introduction ..................... 9 2.2 Features ...................... - Page 4 MCP42XX PICtail™ Plus Daughter Board User’s Guide NOTES: © 2008 Microchip Technology Inc. DS51759A-page iv...
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Page 5: Preface
• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the MCP42XX PICtail Plus Daughter Board User’s Guide. • Appendix C. “Board Testing” – Describes the testing method for the MCP42XX PICtail Plus Daughter Board User’s Guide and what aspects of the board are and are not tested. -
Page 6: Conventions Used In This Guide
MCP42XX PICtail™ Plus Daughter Board User’s Guide CONVENTIONS USED IN THIS GUIDE This manual uses the following documentation conventions: DOCUMENTATION CONVENTIONS Description Represents Examples Arial font: ® Italic characters Referenced books MPLAB IDE User’s Guide Emphasized text ...is the only compiler... -
Page 7: Recommended Reading
Preface RECOMMENDED READING This user's guide describes how to use MCP42XX PICtail Plus Daughter Board User’s Guide. 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 Varia- tions”, DS01080... - Page 8 MCP42XX PICtail™ Plus Daughter Board User’s Guide NOTES: © 2008 Microchip Technology Inc. DS51759A-page 4...
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Page 9: Chapter 1. Product Overview
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, or the provided dedicated GUI may be used. The source code for this dedicated GUI is available, but not supported (as is). -
Page 10: What Is The Mcp42Xx Pictail Plus Daughter Board
MCP42XX PICtail™ Plus Daughter Board User’s Guide WHAT IS THE MCP42XX PICTAIL PLUS DAUGHTER BOARD? The MCP42XX 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 PIC24 Explorer 16 Demo Board or the PICkit™... -
Page 11: What The Mcp42Xx Pictail Plus Daughter Board Kit Includes
• Jumpers to allow Terminal B pins to be connected to V or VBx pad • Connection point for easy connection to Resistor Network Terminal pins WHAT THE MCP42XX PICTAIL PLUS DAUGHTER BOARD KIT INCLUDES This MCP42XX PICtail Plus Daughter Board Kit includes: • One MCP42XX PICtail Plus Daughter Board, 102-00182 •... - Page 12 MCP42XX PICtail™ Plus Daughter Board User’s Guide NOTES: © 2008 Microchip Technology Inc. DS51759A-page 8...
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Page 13: Chapter 2. Installation And Operation
Chapter 2. Installation and Operation INTRODUCTION The MCP42XX PICtail Plus Daughter Board is used to demonstrate the operation of Digital Potentiometer. The operation of the MCP41XX devices is similar to the MCP42XX devices. Therefore, this demo board can be used as a development plat- form for either device family. -
Page 14: Getting Started
MCP42XX PICtail™ Plus Daughter Board User’s Guide GETTING STARTED Figure 2-1 shows a simplified circuit for the MCP42XX 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 MCP42XX PICtail Plus Daughter Board kit comes with firmware for the Explorer 16 Starter Kit (DV164033). -
Page 15: Installation And Operation
PICtail Plus header or the PICkit Serial Analyzer. The Printed Circuit Board (PCB) has been designed for the support of the SPI and I device families (MCP42XX and MCP46XX), so not all components are installed for the SPI version of the demo board. 2.3.1.1 JUMPER DESCRIPTIONS Figure 2-2 shows the function of the demo board jumpers. - Page 16 MCP42XX PICtail™ Plus Daughter Board User’s Guide JMP1:JMP3 - Terminal A Source VAx Pad JMP2:JMP4 - Terminal B Source VBx Pad JP3 - PIC24 AN1 pin AN1 connected to W1 AN1 not connected JP2 - PIC24 AN0 pin JP1 - Explorer 16 5V signal to AV...
- Page 17 Installation and Operation FIGURE 2-3: MCP42XX PICtail Plus Daughter Board Layout with Default Jumper Settings Note: This is the Jumper configuration that the board should be shipped with. © 2008 Microchip Technology Inc. DS51759A-page 13...
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Page 18: Explorer 16 Daughter Demo Board Demos
MCP42XX PICtail™ Plus Daughter Board User’s Guide EXPLORER 16 DAUGHTER DEMO BOARD DEMOS This section describes how to demonstrate the MCP42XX PICtail Plus Daughter Board. The demos will either use an Explorer 16 Developers Board or a PICkit Serial Analyzer. - Page 19 Channel 4 (Program 2 SDO Signal) Channel 4 Channel 3 Channel 2 FIGURE 2-4: MCP4XXDM-PTPLS Jumper Configuration and Oscilloscope Test Points. Note: This is the Jumper configuration that the board should be shipped with. © 2008 Microchip Technology Inc. DS51759A-page 15...
- Page 20 INTO THE EXPLORER 16 STARTER KIT (DV164033) Figure 2-5 shows the component placement on the Explorer 16 Demo Board including the PICtail Plus header that the MCP42XX PICtail Plus Daughter Board is inserted into. The boards Reset switch and other switches are pointed out.
- Page 21 (see for scope details) Note 1: The SDI and SCK signals go from V to approximately 3.3V due to the PIC24 operating at 3.3V. The VW1 signals go from V to approximately 5V. © 2008 Microchip Technology Inc. DS51759A-page 17...
- Page 22 MCP42XX PICtail™ Plus Daughter Board User’s Guide TABLE 2-2: DEMO STEPS USING THE PICDEM HPC EXPLORER DEMO BOARD (CONTINUED) Step Action Result Depress the Explorer 16 Developer Board’s S6 While S6 is depressed, the voltage push button on Wiper 1 (VW1) increases Depress the Explorer 16 Developer Board’s S4...
- Page 23 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. © 2008 Microchip Technology Inc. DS51759A-page 19...
- Page 24 MCP42XX 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.
- Page 25 “Set Baud” button results in an actual Baud Rate of 9.62 kHz, as shown in Figure 2-10. This reflects the actual Baud Rate based on the PICkit Serial Analyzer’s clock fre- quency. FIGURE 2-9: Configuring the Baud Rate - Desired Baud Rate. © 2008 Microchip Technology Inc. DS51759A-page 21...
- Page 26 MCP42XX device, click on the “Disable CS” button. The GUI window will now look like Figure 2-11. To have access to more control of the MCP42XX memory, click on the Advanced tab, and the GUI will display Figure 2-12.
- Page 27 To write to a desired register, in the desired data entry box and click on the Write button. Figure 2-14 shows an example of writing to the Volatile Wiper 0 register. FIGURE 2-13: Advance Screen - Read Register. © 2008 Microchip Technology Inc. DS51759A-page 23...
- Page 28 MCP42XX PICtail™ Plus Daughter Board User’s Guide FIGURE 2-14: Advance Screen - Write Register. © 2008 Microchip Technology Inc. DS51759A-page 24...
- Page 29 Figure 2-15 shows the connections for the Demo using the PICkit Serial Analyzer. Insert PICkit Serial Analyzer into this Header Channel 1 FIGURE 2-15: PICkit Serial Analyzer Demo Jumper Configuration and Oscilloscope Test Points. © 2008 Microchip Technology Inc. DS51759A-page 25...
- Page 30 MCP42XX PICtail™ Plus Daughter Board User’s Guide 2.4.2.2 DEMO STEPS The use of the PICkit Serial Analyzer means that wiper pin’s voltage is under direct control from the PC’s GUI interface and more user experimentation is possible. TABLE 2-4: DEMO STEPS USING THE PICDEM HPC EXPLORER DEMO...
- Page 31 If the write is to Non-Volatile mem- ory, power down (unplug) the MCP42XX PICtail Plus Daughter Board and then power up to evaluate if the non-volatile memory value is retained.
- Page 32 MCP42XX PICtail™ Plus Daughter Board User’s Guide NOTES: © 2008 Microchip Technology Inc. DS51759A-page 28...
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Page 33: Appendix A. Schematic And Layouts
SCHEMATICS AND PCB LAYOUT Figure A.3 shows the schematic of the MCP42XX PICtail Plus Daughter Board. Figure A.4 shows the layout for the top layer of the MCP42XX PICtail Plus Daughter Board. The layer order is shown in Figure A-1. -
Page 34: Board - Schematic
MCP42XX PICtail™ Plus Daughter Board User’s Guide BOARD - SCHEMATIC © 2008 Microchip Technology Inc. DS51759A-page 30... -
Page 35: Board - Top Silk-Screen Layer
Schematic and Layouts BOARD – TOP SILK-SCREEN LAYER © 2008 Microchip Technology Inc. DS51759A-page 31... -
Page 36: Board - Top Components + Silk-Screen
MCP42XX PICtail™ Plus Daughter Board User’s Guide BOARD – TOP COMPONENTS + SILK-SCREEN © 2008 Microchip Technology Inc. DS51759A-page 32... -
Page 37: Board - Ground Layer
Schematic and Layouts BOARD – GROUND LAYER © 2008 Microchip Technology Inc. DS51759A-page 33... -
Page 38: Board - Power Layer
MCP42XX PICtail™ Plus Daughter Board User’s Guide BOARD – POWER LAYER © 2008 Microchip Technology Inc. DS51759A-page 34... -
Page 39: Board - Bottom Layer
Schematic and Layouts BOARD – BOTTOM LAYER © 2008 Microchip Technology Inc. DS51759A-page 35... - Page 40 MCP42XX PICtail™ Plus Daughter Board User’s Guide NOTES: © 2008 Microchip Technology Inc. DS51759A-page 36...
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Page 41: Appendix B. Bill Of Materials (Bom)
R10, R12, R13, 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. © 2008 Microchip Technology Inc. DS51759A-page 37... - Page 42 MCP42XX PICtail™ Plus Daughter Board User’s Guide NOTES: © 2008 Microchip Technology Inc. DS51759A-page 38...
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Page 43: Appendix C. Board Testing
Appendix C. Board Testing INTRODUCTION The MCP42XX 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. -
Page 44: What Is Tested
MCP42XX PICtail™ Plus Daughter Board User’s Guide WHAT IS TESTED The following portions of the board are tested: • MCP4261 (U2) - U2 MCP4261 Pot 1 is tested in Potentiometer configuration. • JMP3 (P1 – P2) - AVDD to P1A •... - Page 45 Board Testing NOTES: © 2008 Microchip Technology Inc. DS51759A-page 41...
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Page 46: Worldwide Sales And Service
Fax: 86-592-2388130 Fax: 886-2-2508-0102 Toronto China - Xian Thailand - Bangkok Mississauga, Ontario, Tel: 86-29-8833-7252 Tel: 66-2-694-1351 Canada Fax: 86-29-8833-7256 Fax: 66-2-694-1350 Tel: 905-673-0699 China - Zhuhai Fax: 905-673-6509 Tel: 86-756-3210040 Fax: 86-756-3210049 01/02/08 © 2008 Microchip Technology Inc. DS51759A-page 42...
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