MCP42XXEV

MCP42XXEV Evaluation Board User’s Guide  2010 Microchip Technology Inc. DS51898A Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. • Microchip is willing to work with the customer who is concerned about the integrity of their code. • Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.” Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR 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. Trademarks The Microchip name and logo, the Microchip logo, dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART, PIC32 logo, rfPIC and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor, MXDEV, MXLAB, SEEVAL 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, HI-TIDE, In-Circuit Serial Programming, ICSP, Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB, MPLINK, mTouch, Octopus, Omniscient Code Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, REAL ICE, rfLAB, Select Mode, Total Endurance, TSHARC, UniWinDriver, 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. © 2010, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. ISBN: 978-1-60932-134-5 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. DS51898A-page 2  2010 Microchip Technology Inc. MCP42XXEV EVALUATION BOARD USER’S GUIDE Table of Contents Preface ........................................................................................................................... 5 Chapter 1. Product Overview 1.1 Introduction ..................................................................................................... 9 1.2 What is the MCP42XXEV Evaluation Board? ................................................ 9 1.3 What the MCP42XXEV Evaluation Board Kit Includes ................................ 10 Chapter 2. Installation and Operation 2.1 Introduction ................................................................................................... 11 2.2 Features ....................................................................................................... 12 2.3 Getting Started ............................................................................................. 13 2.4 MCP42XXEV Evaluation Board Description ................................................ 13 2.5 Configuring The PICkit™ Serial Analyzer .................................................... 19 2.6 MCP4261 Demo Steps ................................................................................. 28 Appendix A. Schematic and Layouts A.1 Introduction .................................................................................................. 33 A.2 Schematics and PCB Layout ....................................................................... 33 A.3 Board – Schematic ....................................................................................... 34 A.4 Board – Top Trace, Silk and Pads .............................................................. 35 A.5 Board – Bottom Trace and Pads .................................................................. 36 A.6 Board – Layer 2 Ground Plane ................................................................... 37 A.7 Board – Layer 3 Power Plane ...................................................................... 38 A.8 Board Layout – Top Components ................................................................ 39 A.9 Board – Bottom Silk, Trace and Pads ........................................................ 40 Appendix B. Bill of Materials (BOM) Worldwide Sales and Service .................................................................................... 42  2010 Microchip Technology Inc. DS51898A-page 3 MCP42XXEV Evaluation Board User’s Guide NOTES: DS51898A-page 4  2010 Microchip Technology Inc. MCP42XXEV EVALUATION 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 MCP42XXEV Evaluation Board. Items discussed in this chapter include: • • • • • Document Layout Conventions Used in this Guide The Microchip Web Site Customer Support Document Revision History DOCUMENT LAYOUT This document describes how to use the MCP42XXEV Evaluation 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 MCP42XXEV Evaluation Board. • Chapter 2. “Installation and Operation” – Includes instructions on how to get started with this evaluation board. • Appendix A. “Schematic and Layouts” – Shows the schematic and layout diagrams for the MCP42XXEV Evaluation Board. • Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the MCP42XXEV Evaluation Board.  2010 Microchip Technology Inc. DS51898A-page 5 MCP42XXEV Evaluation 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 < > DS51898A-page 6 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 ,  2010 Microchip Technology Inc. Preface RECOMMENDED READING This user’s guide describes how to use the MCP42XXEV Evaluation 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) AN1316 Application Note, “Using Digital Potentiometers for Programmable Amplifier Gain” (DS01316) These data sheets provide detailed information regarding the MCP41XX/42XX and product family: MCP413X/415X/423X/425X Data Sheet, “7/8-Bit Single/Dual SPI Digital POT with Volatile Memory” (DS22060) MCP414X/416X/424X/426X Data Sheet, “7/8-Bit Single/Dual SPI Digital POT with Non-Volatile Memory” (DS22059) 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 In addition, there is a Development Systems Information Line which lists the latest versions of Microchip's development systems software products. This line also provides information on how customers can receive currently available upgrade kits. The Development Systems Information Line numbers are: 1-800-755-2345 – United States and most of Canada 1-480-792-7302 – Other International Locations  2010 Microchip Technology Inc. DS51898A-page 7 MCP42XXEV Evaluation Board User’s Guide DOCUMENT REVISION HISTORY Revision A (April 2010) • Initial Release of this Document. DS51898A-page 8  2010 Microchip Technology Inc. MCP42XXEV EVALUATION BOARD USER’S GUIDE Chapter 1. Product Overview 1.1 INTRODUCTION This chapter provides an overview of the MCP42XXEV Evaluation Board and covers the following topics: • What is the MCP42XXEV Evaluation Board? • What the MCP42XXEV Evaluation Board kit includes 1.2 WHAT IS THE MCP42XXEV EVALUATION BOARD? The MCP42XXEV Evaluation Board allows the system designer to quickly evaluate the operation of Microchip Technology’s MCP4261 Digital Potentiometer device. This device is similar to the following devices: • • • • • • • • • • • • • • • • • • • • • • • MCP4231 MCP4232 MCP4241 MCP4242 MCP4251 MCP4252 MCP4261 MCP4262 MCP4331 MCP4332 MCP4341 MCP4342 MCP4351 MCP4352 MCP4362 MCP4131 MCP4132 MCP4141 MCP4142 MCP4151 MCP4152 MCP4161 MCP4162 The board uses the TSSOP20EV generic PCB and has been populated for the MCP4261. The 6-pin header (PICkit™ serial) has been jumpered to the MCP4261’s appropriate pins. This allows the PICkit serial to communicate with the device. Additional blank PCBs may be ordered by using the order number: TSSOP20EV. Each TSSOP20EV kit contains 5 PCBs. Figure 1-1 shows the top view of the populated TSSOP20EV PCB which creates the MCP42XXEV Evaluation Board.  2010 Microchip Technology Inc. DS51898A-page 9 MCP42XXEV Evaluation Board User’s Guide Connected to Ground Plane Connected to Power Plane 0 4261 MCP4261-103E/ST installed in U3 (TSSOP-14 package bottom aligned to TSSOP-20 footprint) 10 k 10 k 0 Through hole Test Point (Orange) Wiper 1 Four Blue Wire Jumpers to connect PICkit™ Serial interface (SPI) to device pins 0 Through hole Test Point (Orange) Wiper 0 0 1x6 Male Header, with 90 right angle FIGURE 1-1: MCP42XXEV Evaluation Board Using the TSSOP20EV Evaluation Board (MCP4361 installed in U3 – Package Bottom Aligned). 1.3 WHAT THE MCP42XXEV EVALUATION BOARD KIT INCLUDES This MCP42XXEV Evaluation Board kit includes: • MCP42XXEV Evaluation Board • One TSSOP-20 and SSOP-20 Evaluation Board blank PCB, 102-00272. Extra blank PCBs can be ordered (order #: TSSOP20EV) • Important Information Sheet DS51898A-page 10  2010 Microchip Technology Inc. MCP42XXEV EVALUATION BOARD USER’S GUIDE Chapter 2. Installation and Operation 2.1 INTRODUCTION The MCP42XXEV Evaluation Board allows the system designer to quickly evaluate the operation of the MCP4261 10 k (-103) digital potentiometer device using the PICkit Serial Analyzer. The PICkit Serial Analyzer is available separately (order number: DV164122). This board is a minimum configuration for the device. As well as the device, other desired passive components (resistors and capacitors) and connection posts may be installed. The board can also be very easily jumpered into a customer’s existing circuit. This gives an indication of the MCP4261 device performance, but is affected by the jumper lead length and the EM noise that the jumpers pick up. The device’s Resistor Network 0 has been configured in a Potentiometer mode with the A terminal connected to VDD through a 0 resistor and the B terminal connected to VSS with a 0 resistor. Resistor Network 1 can be evaluated for rheostat operation. The MCP42XXEV Evaluation Board uses the generic TSSOP20EV Evaluation Board PCB. The kit includes a second PCB which is blank for the user to populate as desired. Additional PCBs may be ordered (order number: TSSOP20EV). The TSSOP20EV kit includes 5 blank PCBs. Other boards can easily be built up using the TSSOP20EV PCB to allow evaluation of other resistance options (5 k, 50 k, or 100 k) or any of the other digital potentiometer devices in the following packages: • TSSOP-20 package - MCP4331, MCP4341, MCP4351, or MCP4361 • TSSOP-14 package - MCP4332, MCP4342, MCP4352, MCP4362, MCP4231, MCP4241, MCP4251, MCP4261, MCP4631, MCP4641, MCP4651, MCP4661, MCP42010, MCP42050, or MCP42100 The board also has a 6-pin interface (PICkit serial, ICSP™, etc.) whose signals can easily be jumpered to any of the device’s pins. Additional information on using the TSSOP20EV Evaluation Board PCB or for modifying the MCP42XXEV Evaluation Board is available in the TSSOP20EV User’s Guide (DS51875). Appendix A. “Schematic and Layouts” has information on the PCB schematic and layout while Figure 2-2 shows components that are installed on the PCB.  2010 Microchip Technology Inc. DS51898A-page 11 MCP42XXEV Evaluation Board User’s Guide 2.2 FEATURES The MCP42XXEV Evaluation Board has the following features: • MCP4261-103E/ST is installed (bottom aligned in U3) • 0 resistors connect MCP4261 VDD and VSS signals to the appropriate power or ground plane (see Figure 2-2) • 0 resistors connect MCP4261’s Resistor Network 0 A terminal signal to power plane, resistor network is in a voltage divider configuration (see Figure 2-2) • 0 resistors connect MCP4261’s Resistor Network 0 B terminal signal to ground plane, resistor network is in a voltage divider configuration (see Figure 2-2) • Through-hole connection terminal (orange) for all wiper pins • Connection terminal points for all device pins (either through-hole or surface-mount) • Footprints for optional passive components (SMT 805 footprint) for: - Power supply filtering (C1 and C2 footprints) - Device bypass capacitor (RxD footprint for device pin connected to VDD) • Silk-screen area to write specifics of implemented circuit (on back of PCB), such as MCP4261 10 k • PICkit Serial Analyzer Header The included TSSOP20EV board has the following features: • Connection terminals may be either through-hole or surface-mount • Three package type footprints supported: - TSSOP-20 - TSSOP-14 - TSSOP-8 - SSOP-20 - DIP-20 (600 mil body) • Footprints for optional passive components (SMT 805 footprint) for: - Power supply filtering (C1 and C2 footprints) - Device bypass capacitor (RxD footprint for device pin connected to VDD) - Output filtering (RxD footprint) - Output pull-up resistor (RxU footprint) - Output pull-down resistor (RxD footprint) - Output loading resistor (RxD footprint) • Silk-screen area to write specifics of implemented circuit (on back of PCB), such as MCP4261 10 k • PICkit Serial Analyzer/PICkit 2 programming (ICSP™) Header DS51898A-page 12  2010 Microchip Technology Inc. Installation and Operation 2.3 GETTING STARTED The MCP42XXEV Evaluation Board allows quick evaluation of the MCP4261-103E/ST device. The understanding of the device characteristics (such as the resistor network) is applicable to any of the devices in the MCP42XX family. The MCP4261-103 device has a typically RAB resistance of 10 k. Evaluation can be done by: • Using the PICkit Serial Analyzer for interface communication • Jumpering the MCP42XXEV Evaluation Board into your application circuit to control the MCP4261-103 device This user guide will discuss the steps needed to evaluate the MCP4261-103E/ST device using the PICkit Serial Analyzer (order number: DV164122). Section 2.5 “Configuring The PICkit™ Serial Analyzer” shows the steps to configure the PICkit Serial Analyzer as well as create User Script files which are used to communicate with the MCP4261, based on the device’s SPI communication protocol format. 2.4 MCP42XXEV EVALUATION BOARD DESCRIPTION The MCP42XXEV Evaluation Board uses the flexible TSSOP20EV Evaluation Board PCB. This simple evaluation board allows the system designer to quickly evaluate the operation of the MCP4261-103 device (RAB(TYP) = 10 k) using the PICkit Serial Analyzer or by jumpering the board into their application system. The PICkit Serial Analyzer is available separately (order number: DV164122). 2.4.1 The Hardware Figure 2-2 shows the component layout of the MCP42XXEV Evaluation Board. This is a small four-layer board (3.9" x 2.1" (99.06 mm x 53.34 mm)). There are twenty-two connection points/pads that can use either through-hole or surface-mount connector posts. The pad labeled VDD is connected to the PCB power plane, while the pad labeled VSS is connected to the PCB ground plane. All the passive components that are connected to VDD or VSS are connected to either the power plane or ground plane. The twenty remaining PCB pads correspond to the device pins (i.e., pad 1 connects to pin 1). Each pad has two passive components associated with them: a pull-up resistor and a pull-down resistor. The pull-up resistor is always RXU and the pull-down resistor is RXD. The “X” is a numeric value that corresponds to a particular pad (1 to 8). As an example, Pad 5’s pull-up resistor is R5U. Capacitor C1 and C2 are the power supply filtering capacitors. For whichever pin is the device’s VDD, the RxD component footprint can be used for the device’s bypass capacitor. Table 2-2 describes the components. A 6-pin header interface is available to support the PICkit serial or the PIC® MCU In-Circuit Serial Programming™ (ICSP™) interface. The MCP4261 is bottom aligned in the U3 footprint so that the interface signals are on the same U3 package pins as the MCP4361 device. This is done to show the footprint compatibility between the MCP42X1 and MCP43X1 devices.  2010 Microchip Technology Inc. DS51898A-page 13 MCP42XXEV Evaluation Board User’s Guide P1 P2 DIP-20 (1) P9 PICkit™ Serial/ICSP™ Interface J1 NC VDD VSS SDA SCL NC NC VDD VSS SDI SCK SDO 1 P20 20 P19 19 2 P12 9 12 P11 10 11 Requires blue wire jumpering to connect the PICkit™ Interface to the selected device P10 R1U TSSOP-20 (1) VDD 20 2 19 9 12 10 11 VSS P1 R1D 1 C2 C1 R2U P2 R2D P19 P11 R19U P19 R19D P20 SSOP-20 P1 1 20 2 19 XTAL P9 P12 P2 P10 9 12 VIA1 10 11 C3 VIA2 C4 R20U P20 PIC® MCU Circuitry (bottom of PCB) R20D Note: The MCP42X1 (TSSOP-14) device will use the TSSOP-20 footprint and be bottom aligned to illustrate MCP42X1 and MCP43X1 footprint compatibility. FIGURE 2-1: DS51898A-page 14 TSSOP20EV Evaluation Board Circuit.  2010 Microchip Technology Inc. Installation and Operation MCP4261-103E/ST Installed in U3 (TSSOP-14 package bottom aligned to TSSOP-20 footprint) Connected to Connected to Ground Plane Power Plane 4261 0  10 k 10 k 0 Through hole Test Point (Orange) Wiper 1 0 Through hole Test Point (Orange) Wiper 0 0 Four Blue Wire Jumpers to connect PICkit™ Serial interface (SPI) to device pins 1x6 Male Header, with 90 right angle FIGURE 2-2: MCP42XXEV Evaluation Board Component Placement Using the TSSOP20EV Evaluation Board (Top).  2010 Microchip Technology Inc. DS51898A-page 15 MCP42XXEV Evaluation Board User’s Guide TABLE 2-1: INSTALLED PASSIVE COMPONENTS (2) Component Description Comment R11U, R17U 0 SMT 805 Pull-up resistor R14U, R15U 10 k SMT 805 Pull-up resistor R7D, R13D 0 SMT 805 Pull-down resistor (1) U3 MCP4261-103E/ST RAB(TYP) = 10 k Device bottom aligned in U3 footprint P9, P12 Test Point – through-hole connector (orange) J1 1x6 Male Header, 100 mil spacing 90° angle. PICkit™ Serial/ICSP™ Header — Blue Wire: See Figure 2-2 J1 CS/NC via to P4 via J1 SDI/SDA via to P16 via J1 SCK/SCL via to P5 via J1 SDO/NC via to P6 via Note 1: 2: Whichever pin is the device’s VDD pin, that corresponding RXD footprint can be used for the device’s bypass capacitor. So if Pin 8 is the device’s VDD pin, then install the bypass capacitor in the R8D footprint. All passive components use the surface mount 805 footprint. DS51898A-page 16  2010 Microchip Technology Inc. Installation and Operation TABLE 2-2: OPTIONAL PASSIVE COMPONENTS – NOT INSTALLED (2) Component Comment C1, C2 Power supply bypass capacitors (3) C3, C4 PIC® MCU Crystal capacitors R1U, R2U, R3U, R4U, R5U, R6U, R7U, R8U, R9U, R12U, R13U, R16U, R18U, R19U, R20U Pull-up resistor R1D, R2D, R3D, R4D, R5D, R6D, R8D, R9D, R10D, R11D, R12D, R14D, R15D, R16D, R17D, R18D, R19D, R20D Pull-down resistor (1) U1, U2 Alternate package footprints VDD, GND Power and Ground plane connection points Y1 Can connect to either PIC® MCUs main oscillator or to the Timer oscillator circuit. P1, P2, P3, P4, P5, P6, P8, P10, P11, P13, P14, Test Point connectors P15, P16, P17, P18, P19, P20 Note 1: 2: 3:  2010 Microchip Technology Inc. Whichever pin is the device’s VDD pin, that corresponding RXD footprint can be used for the device’s bypass capacitor. So if Pin 8 is the device’s VDD pin, then install the bypass capacitor in the R8D footprint. All passive components use the surface mount 805 footprint. If the board is powered via the VDD and GND connection points, the use of bypass capacitors on C1 and C2 may improve performance. The benefit is reduced if the board is powered via the PICkit™ serial interface. DS51898A-page 17 MCP42XXEV Evaluation Board User’s Guide 2.4.2 The MCP4261 Device To make variations to the commands sent to the MCP4261 device (from the commands shown in the demo section), one must know the device memory map (see Table 2-3) and the command formats (see Figure 2-3). For additional device operational information, refer to the MCP4261 device data sheet (DS22059). TABLE 2-3: Address MEMORY MAP AND THE SUPPORTED COMMANDS Memory Type Function 00h Volatile Wiper 0 01h Volatile Wiper 1 02h 03h 04h Nonvolatile Wiper 0 Nonvolatile Wiper 1 Volatile TCON0 Register STATUS Register 05h Allowed Commands Disallowed Commands (2) RAM Read, Write, — Increment, Decrement RAM Read, Write, — Increment, Decrement Increment, Decrement EEPROM Read, Write (1) EEPROM Read, Write (1) Increment, Decrement RAM Read, Write Increment, Decrement Write, Increment, Decrement (1) Increment, Decrement 06h-0Fh Data EEPROM EEPROM Read, Write Note 1: When an EEPROM write is active, these are invalid commands and will generate an error condition. The user should use a read of the STATUS register to determine when the write cycle has completed. To exit the error condition, the user must take the CS pin to the VIH level and then back to the active state (VIL or VIHH). 2: This command on this address will generate an error condition. To exit the error condition, the user must take the CS pin to the VIH level and then back to the active state (VIL or VIHH). 8-bit Command (Increment or Decrement) Command Byte A A A A C C D D D D D D 1 0 9 8 3 2 1 0 Data Register Memory Bits Address Command Bits FIGURE 2-3: DS51898A-page 18 RAM Read 16-bit Command (Read Data or Write Data) Command Byte Data Byte A A A A C C D D D D D D D D D D D D D D 1 0 9 8 7 6 5 4 3 2 1 0 3 2 1 0 Register Memory Address Command Bits Data Bits Command Bits CC 1 0 0 0 = Write Data 0 1 = INCR 1 0 = DECR 1 1 = Read Data MCP42XX SPI Command Formats.  2010 Microchip Technology Inc. Installation and Operation 2.5 CONFIGURING THE PICkit™ SERIAL ANALYZER 2.5.1 Modifying the CommScripts.txt file Example 2-1 shows the User Scripts for the MCP43XX devices (from MCP43XXEV Evaluation Board). These script files are compatible with the MCP42XX devices, with the exception of commands to Wiper 2, Wiper 3, or TCON1 registers (commands shaded in red). These User Scripts need to be added to the PICkit serial’s CommScripts.txt file. The default install location of this file is: C:\Program Files\Microchip\PICkit Serial Analyzer Once these are saved in the CommScripts.txt file and the Master SPI mode is selected as the communication mode, these User Scripts will be available to select from. NOTICE Note 1: 2: EXAMPLE 2-1: It is recommended that you make a backup of your CommScript.txt file before making any edits with a text editor. It has been observed that coping the text from this PDF and pasting into the PICkit serial’s CommScript.txt file will cause errors due to the blank spacing used in the PDF file. Please copy from the MCP43XX CommScript.txt file available from the Microchip web site (MCP43XXEV Evaluation Board product page). MCP43XX SCRIPT FILE (COMMSCRIPTS.TXT) WriteWiper0 ReadWiper0 WriteWiper1 ReadWiper1 SPI SPI SPI SPI SPICSON SPICSON SPICSON SPICSON SPIDATOUT SPIDATIO SPIDATOUT SPIDATIO 0x02 0x02 0x02 0x02 0x00 0x0C 0x10 0x1C 0x3F 0xA5 0x3F 0xA5 SPICSOFF SPICSOFF SPICSOFF SPICSOFF WriteWiper2 ReadWiper2 WriteWiper3 ReadWiper3 SPI SPI SPI SPI SPICSON SPICSON SPICSON SPICSON SPIDATOUT SPIDATIO SPIDATOUT SPIDATIO 0x02 0x02 0x02 0x02 0x60 0x6C 0x70 0x7C 0x3F 0xA5 0x3F 0xA5 SPICSOFF SPICSOFF SPICSOFF SPICSOFF WriteWiper0NV ReadWiper0NV WriteTCON0 ReadTCON0 SPI SPI SPI SPI SPICSON SPICSON SPICSON SPICSON SPIDATOUT SPIDATIO SPIDATOUT SPIDATIO 0x02 0x02 0x02 0x02 0x20 0x2C 0x40 0x4C 0x3F 0xA5 0xFF 0xA5 SPICSOFF SPICSOFF SPICSOFF SPICSOFF WriteTCON1 ReadTCON1 SPI SPI SPICSON SPICSON SPIDATOUT SPIDATIO 0x02 0x02 0xA0 0xAC 0xFF 0xA5 SPICSOFF SPICSOFF ReadSTATUS INCRWiper0 DECRWiper0 SPI SPI SPI SPICSON SPICSON SPICSON SPIDATIO SPIDATIO SPIDATIO 0x02 0x01 0x01 0x5C 0x04 0x08 0xA5 SPICSOFF SPICSOFF SPICSOFF  2010 Microchip Technology Inc. DS51898A-page 19 MCP42XXEV Evaluation Board User’s Guide 2.5.2 Working With the PICkit™ Serial Analyzer Figure 2-4 shows the PICkit Serial window after the program has started. The Transaction window indicates if the PICkit serial GUI located the PICkit Serial Analyzer hardware. When starting the PICkit Serial Analyzer for the first time, some setup questions may be asked. If you have any questions, please refer to the PICkit Serial Analyzer documentation, available at www.Microchip.com/PICkitSerial. FIGURE 2-4: DS51898A-page 20 PICkit™ Serial Main Window at Start-up.  2010 Microchip Technology Inc. Installation and Operation We need to select the PICkit Serial Analyzer GUI to be in SPI Master mode. Figure 2-5 shows how to select the proper mode. Select PICkit Serial Analyzer -> Select Communications Mode -> SPI Master menu item (make sure the SPI Master item is checked). FIGURE 2-5: PICkit™ Serial Selecting Communications Mode.  2010 Microchip Technology Inc. DS51898A-page 21 MCP42XXEV Evaluation Board User’s Guide Now we need to configure the mode that we selected. Figure 2-6 shows how to configure the Communications mode. Select PICkit Serial Analyzer -> Configure Communications Mode menu item. This will open a new window: FIGURE 2-6: DS51898A-page 22 PICkit™ Serial Main Window at Start-up.  2010 Microchip Technology Inc. Installation and Operation Figure 2-7 shows the Configure Communications Mode window. Ensure that your window options and settings are the same as this window, and then select the Save Changes button. The Configure Communications Mode window may now be closed. FIGURE 2-7: PICkit™ Serial Configure Communications Mode Window.  2010 Microchip Technology Inc. DS51898A-page 23 MCP42XXEV Evaluation Board User’s Guide Now we are going to open the Script Builder window, select the Communications -> Script -> Script Builder menu item (see Figure 2-8). FIGURE 2-8: DS51898A-page 24 PICkit™ Serial – Script Builder Menu Selection.  2010 Microchip Technology Inc. Installation and Operation The Script Builder window is shown in Figure 2-9. In this window we see the User SPI Scripts including the ones that were added to the CommScripts.txt file. FIGURE 2-9: PICkit™ Serial Main Window at Start-up.  2010 Microchip Technology Inc. DS51898A-page 25 MCP42XXEV Evaluation Board User’s Guide Double clicking on the WriteWiper0 User SPI Script will load the script details. Figure 2-10 shows what the values mean in the Script Details. These values are hex numbers. The first value (02h), is the number of bytes that will be written. The second byte is a data byte and contains the device register address, the Device command, and the two Most Significant bits (MSb) of the write data. The third byte is the 2nd data byte and contains the remaining 8 bits of the write data. Number of Bytes that will be written Data Byte #1 (Device Register Address + Command + Data bit “D8” FIGURE 2-10: DS51898A-page 26 Data Byte #2 (Write Data “D7:D0” Example Write Script.  2010 Microchip Technology Inc. Installation and Operation Double clicking on the ReadWiper0 User SPI Script will load the script details. Figure 2-11 shows what the values mean in the Script Details. These values are hex numbers. The first value (02h), is the number of bytes that will be written. The second byte is a data byte and contains the device register address, the Device command, and the two Most Significant bits (MSb) of the read data. The third byte is the 2nd data byte and contains the remaining 8 bits of the read data. During Read commands, the value of the two LSbs of Data Byte #1 and all of the bits of Data Byte #2 are not important. The bytes are required for the SPI clock generation. Number of Bytes that will be written Data Byte #1 (Device Register Address + Command + Data bit “D8” FIGURE 2-11:  2010 Microchip Technology Inc. Data Byte #2 (Write Data “D7:D0” Example Read Script. DS51898A-page 27 MCP42XXEV Evaluation Board User’s Guide 2.6 MCP4261 DEMO STEPS This demo assumes that you know how to configure the PICkit Serial Analyzer for Master SPI operation. See Section 2.5 “Configuring The PICkit™ Serial Analyzer” or the “PICkit Serial Analyzer User’s Guide” (DS51647) for additional information. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. DS51898A-page 28 Plug the PICkit serial device into the PC’s USB port. Plug the MCP42XXEV board into the PICkit serial. Add the User Scripts (see Example 2-1) to the CommScripts.TXT file. Start the PICkit serial GUI. Ensure the GUI is in Master SPI Communication mode (see Figure 2-5). Ensure that the Master SPI configuration is appropriately configured (see Figure 2-7). Measure the Wiper 0 voltage on the MCP42XXEV board (see Figure 2-2) using an oscilloscope or digital multimeter. Measure voltage from the ground plane (GND) to the wiper (P12). The voltage on the wiper should be ~ VDD/2 (~2.5V). Open the Script Builder window (see Figure 2-8). Double click on the “WriteWiper0” script in the Example SPI Scripts column. This loads the Script Detail column (see Figure 2-10). Click on the Execute Script button. This executes the script shown in the Script Detail column, which will update the wiper value to 3Fh. The wiper voltage will now be ~VDD/4 (~1.25V). The Transaction window (see Figure 2-13) will be updated to indicate the execution of the script. Select the “ReadWiper0” script in the User SPI Scripts column. It should look like Figure 2-11. Click on the Execute Script button. This executes the script shown in the Script Detail column. The Transaction window (see Figure 2-13) will be updated to indicate the execution of the script. The data read is shown in the last line. Double click on the “WriteWiper0” script in the Example SPI Scripts column. This loads the Script Detail column and modifies the Wiper 0 data to 1FFh (see Figure 2-12). Click on the Execute Script button. This executes the script shown in the Script Detail column, which will update the wiper value to 1FFh. The wiper voltage will now be ~VDD (~5V). The Transaction window (see Figure 2-13) will be updated to indicate the execution of the script. Select the “ReadWiper0” script in the User SPI Scripts column. It should look like Figure 2-11. Click on the Execute Script button. This executes the script shown in the Script Detail column. The Transaction window (see Figure 2-13) will be updated to indicate the execution of the script. The data read is shown in the last line. In the Transaction window, click the Clear button. On the PICkit Serial Analyzer command bar, click the Reset button. Select the “WriteWiper0” script in the User SPI Scripts column and then click on the Execute Script button. Select the “ReadWiper0” script in the User SPI Scripts column and then click on the Execute Script button.  2010 Microchip Technology Inc. Installation and Operation 21. Select the “DECRWiper0” script in the User SPI Scripts column and then click on the Execute Script button three times. 22. Select the “ReadWiper0” script in the User SPI Scripts column and then click on the Execute Script button. The Transaction window shows the scripts that were executed and the current value of the Wiper 0 (see Figure 2-14). 23. In the Transaction window, click the Clear button. 24. On the PICkit Serial Analyzer command bar, click the Reset button. 25. Select the “WriteWiper0” script in the User SPI Scripts column and then click on the Execute Script button. 26. Select the “ReadWiper0” script in the User SPI Scripts column and then click on the Execute Script button. 27. Select the “INCRWiper0” script in the User SPI Scripts column and then click on the Execute Script button three times. 28. Select the “ReadWiper0” script in the User SPI Scripts column and then click on the Execute Script button. The Transaction window shows the scripts that were executed and the current value of the Wiper 0 (see Figure 2-15) 29. You can repeat the sequence of writing values to the wiper register or writing then reading the values back. NOTICE If at any time during script execution, an error message is generated in the Transaction window, it is good practice to reset the PICkit™ Serial Analyzer (PKSA). The PKSA can be reset using the “Reset” toolbar icon. Verify that subsequent script operations do not generate errors. Write Command to Wiper 0 Register (D8 = 1) FIGURE 2-12:  2010 Microchip Technology Inc. Wiper 0 Data (D7:D0 = ‘FFh’) MCP42XX Write Wiper 0 Script File – Updating Wiper Value. DS51898A-page 29 MCP42XXEV Evaluation Board User’s Guide 9-bit data value (03Fh) written to Wiper 0 register 9-bit data value (1FFh) written to Wiper 0 register FIGURE 2-13: 9-bit data value (03Fh) read from Wiper 0 register 9-bit data value (1FFh) read from Wiper 0 register MCP4261 Transaction Window – Wiper 0 Writes and Reads. Data value (03Fh) read from Wiper 0 register Data value (03Ch) read from Wiper 0 register after 3 Decrement Commands FIGURE 2-14: DS51898A-page 30 MCP4261 Transaction Window – Wiper 0 Decrements.  2010 Microchip Technology Inc. Installation and Operation Data value (03Fh) read from Wiper 0 register Data value (042h) read from Wiper 0 register after 3 Increment Commands FIGURE 2-15: MCP4261 Transaction Window – Wiper 0 Increments.  2010 Microchip Technology Inc. DS51898A-page 31 MCP42XXEV Evaluation Board User’s Guide 2.6.1 The TSSOP20EV PCB and Supported Digital Potentiometers Table 2-4 shows the current digital potentiometers that are supported by the TSSOP20EV PCB. TABLE 2-4: Device DS51898A-page 32 TSSOP20EV PCB SUPPORTED DIGITAL POTENTIOMETERS TSSOP-20 TSSOP-14 Comment MCP4231 — Yes Dual Pot, SPI Interface MCP4241 — Yes Dual Pot, SPI Interface MCP4251 — Yes Dual Pot, SPI Interface MCP4261 — Yes Dual Pot, SPI Interface MCP4331 Yes — Quad Pot, SPI Interface MCP4341 Yes — Quad Pot, SPI Interface MCP4351 Yes — Quad Pot, SPI Interface MCP4361 Yes — Quad Pot, SPI Interface MCP4631 — Yes Dual Pot, I2C™ Interface MCP4641 — Yes Dual Pot, I2C™ Interface MCP4651 — Yes Dual Pot, I2C™ Interface MCP4661 — Yes Dual Pot, I2C™ Interface MCP42010 — Yes Dual Pot, SPI Interface MCP42050 — Yes Dual Pot, SPI Interface MCP42100 — Yes Dual Pot, SPI Interface  2010 Microchip Technology Inc. MCP42XXEV EVALUATION BOARD USER’S GUIDE Appendix A. Schematic and Layouts A.1 INTRODUCTION This appendix contains the schematics and layouts for the MCP42XXEV Evaluation Board. Diagrams included in this appendix: • • • • • • • A.2 Board – Schematic Board – Top Trace, Silk and Pads Board – Bottom Trace and Pads Board – Layer 2 Ground Plane Board – Layer 3 Power Plane Board Layout – Top Components Board – Bottom Silk, Trace and Pads SCHEMATICS AND PCB LAYOUT Board – Schematic shows the schematic of the MCP42XXEV Evaluation Board. The layer order is shown in Figure A-1. Top Layer Ground Layer Power Layer Bottom Layer FIGURE A-1:  2010 Microchip Technology Inc. Layer Order. DS51898A-page 33 MCP42XXEV Evaluation Board User’s Guide BOARD – SCHEMATIC M A.3 DS51898A-page 34  2010 Microchip Technology Inc. Schematic and Layouts A.4 BOARD – TOP TRACE, SILK AND PADS  2010 Microchip Technology Inc. DS51898A-page 35 MCP42XXEV Evaluation Board User’s Guide A.5 BOARD – BOTTOM TRACE AND PADS DS51898A-page 36  2010 Microchip Technology Inc. Schematic and Layouts A.6 BOARD – LAYER 2 GROUND PLANE  2010 Microchip Technology Inc. DS51898A-page 37 MCP42XXEV Evaluation Board User’s Guide A.7 BOARD – LAYER 3 POWER PLANE DS51898A-page 38  2010 Microchip Technology Inc. Schematic and Layouts A.8 BOARD LAYOUT – TOP COMPONENTS  2010 Microchip Technology Inc. DS51898A-page 39 MCP42XXEV Evaluation Board User’s Guide A.9 BOARD – BOTTOM SILK, TRACE AND PADS DS51898A-page 40  2010 Microchip Technology Inc. MCP42XXEV EVALUATION BOARD USER’S GUIDE Appendix B. Bill of Materials (BOM) TABLE B-1: Qty BILL OF MATERIALS Reference Description 1 J1 CONN HEADER 6POS .100 R/A TIN 2 P9, P12 1 PCB TEST POINT PC MULTI PURPOSE THROUGH HOLE (Orange) Note 1 2 4 R14U, R15U R7D, R11U R13D, R17U U3 1 Note 1: 2: RES 10K OHM 1/8W 5% 0805 SMD RES 0.0 OHM 1/8W 5% 0805 SMD Manufacturer Part Number Molex/Waldom Electronics Corp Keystone Electronics 22-05-2061 Microchip Technology Inc. Panasonic – ECG Panasonic – ECG 104-00295 5013 ERJ-6GEYJ103V ERJ-6GEY0R00V MCP4261 10 K OHM Digital Potentiometer Microchip Technology MCP4261-103E/ST device Device bottom aligned in U3 footprint Inc. (See Assembly Drawing) This assembly uses RoHS Compliant TSSOP-20 to DIP-20 Evaluation Board. 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.  2010 Microchip Technology Inc. DS51898A-page 41 WORLDWIDE SALES AND SERVICE AMERICAS ASIA/PACIFIC ASIA/PACIFIC EUROPE Corporate Office 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: http://support.microchip.com Web Address: www.microchip.com Asia Pacific Office Suites 3707-14, 37th Floor Tower 6, The Gateway Harbour City, Kowloon Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431 India - Bangalore Tel: 91-80-3090-4444 Fax: 91-80-3090-4123 India - New Delhi Tel: 91-11-4160-8631 Fax: 91-11-4160-8632 Austria - Wels Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 India - Pune Tel: 91-20-2566-1512 Fax: 91-20-2566-1513 France - Paris Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79 Japan - Yokohama Tel: 81-45-471- 6166 Fax: 81-45-471-6122 Germany - Munich Tel: 49-89-627-144-0 Fax: 49-89-627-144-44 Atlanta Duluth, GA Tel: 678-957-9614 Fax: 678-957-1455 Boston Westborough, MA Tel: 774-760-0087 Fax: 774-760-0088 Chicago Itasca, IL Tel: 630-285-0071 Fax: 630-285-0075 Cleveland Independence, OH Tel: 216-447-0464 Fax: 216-447-0643 Dallas Addison, TX Tel: 972-818-7423 Fax: 972-818-2924 Detroit Farmington Hills, MI Tel: 248-538-2250 Fax: 248-538-2260 Kokomo Kokomo, IN Tel: 765-864-8360 Fax: 765-864-8387 Los Angeles Mission Viejo, CA Tel: 949-462-9523 Fax: 949-462-9608 Santa Clara Santa Clara, CA Tel: 408-961-6444 Fax: 408-961-6445 Toronto Mississauga, Ontario, Canada Tel: 905-673-0699 Fax: 905-673-6509 Australia - Sydney Tel: 61-2-9868-6733 Fax: 61-2-9868-6755 China - Beijing Tel: 86-10-8528-2100 Fax: 86-10-8528-2104 China - Chengdu Tel: 86-28-8665-5511 Fax: 86-28-8665-7889 Korea - Daegu Tel: 82-53-744-4301 Fax: 82-53-744-4302 China - Chongqing Tel: 86-23-8980-9588 Fax: 86-23-8980-9500 Korea - Seoul Tel: 82-2-554-7200 Fax: 82-2-558-5932 or 82-2-558-5934 China - Hong Kong SAR Tel: 852-2401-1200 Fax: 852-2401-3431 Malaysia - Kuala Lumpur Tel: 60-3-6201-9857 Fax: 60-3-6201-9859 China - Nanjing Tel: 86-25-8473-2460 Fax: 86-25-8473-2470 Malaysia - Penang Tel: 60-4-227-8870 Fax: 60-4-227-4068 China - Qingdao Tel: 86-532-8502-7355 Fax: 86-532-8502-7205 Philippines - Manila Tel: 63-2-634-9065 Fax: 63-2-634-9069 China - Shanghai Tel: 86-21-5407-5533 Fax: 86-21-5407-5066 Singapore Tel: 65-6334-8870 Fax: 65-6334-8850 China - Shenyang Tel: 86-24-2334-2829 Fax: 86-24-2334-2393 Taiwan - Hsin Chu Tel: 886-3-6578-300 Fax: 886-3-6578-370 China - Shenzhen Tel: 86-755-8203-2660 Fax: 86-755-8203-1760 Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 China - Wuhan Tel: 86-27-5980-5300 Fax: 86-27-5980-5118 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 China - Xian Tel: 86-29-8833-7252 Fax: 86-29-8833-7256 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 Italy - Milan Tel: 39-0331-742611 Fax: 39-0331-466781 Netherlands - Drunen Tel: 31-416-690399 Fax: 31-416-690340 Spain - Madrid Tel: 34-91-708-08-90 Fax: 34-91-708-08-91 UK - Wokingham Tel: 44-118-921-5869 Fax: 44-118-921-5820 China - Xiamen Tel: 86-592-2388138 Fax: 86-592-2388130 China - Zhuhai Tel: 86-756-3210040 Fax: 86-756-3210049 01/05/10 DS51898A-page 42  2010 Microchip Technology Inc.