Microchip Technology MCP42XXEV Evaluation Board User guide

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in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates.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, K

EELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,

PIC

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.

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 devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified.

MCUs and dsPIC® DSCs, KEELOQ

code hopping

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 Select the Help menu, and then Topics to open a list of available on-line help files.

IDE on-line help.

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 Represents Examples

Arial font:

Italic characters Referenced books MPLAB

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

Initial caps A window the Output window

A dialog the Settings dialog A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

Underlined, italic text with right angle bracket

Bold characters A dialog button Click OK

N‘Rnnnn A number in verilog format,

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

A menu path File>Save

A tab Click the Power tab

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

IDE User’s Guide

“Save project before build”

4‘b0010, 2‘hF1

DS51898A-page 6  2010 Microchip Technology Inc.

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.

USER’S GUIDE

 2010 Microchip Technology Inc. DS51898A-page 9

MCP42XXEV Evaluation Board User’s Guide

0 

10 k

4261

Four Blue Wire

PICkit™ Serial

1x6 Male Header,

MCP4261-103E/ST installed in U3

Connected to Ground Plane

Connected to Power Plane

Through hole Test Point (Orange)

Wiper 0

Wiper 1

(TSSOP-14 package

with 90 right angle

Jumpers to connect

interface (SPI) to device pins

bottom aligned to TSSOP-20 footprint)

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

DS51898A-page 10  2010 Microchip Technology Inc.

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

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 V 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.

MCP42XXEV EVALUATION BOARD

USER’S GUIDE

through a 0 resistor and the B terminal connected to VSS

 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 V 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 (C

and C2 footprints)

- Device bypass capacitor (RxD footprint for device pin connected to V

• 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 (C

and C2 footprints)

- Device bypass capacitor (RxD footprint for device pin connected to V

- 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

and VSS signals to the appropriate power or

)

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 R

• 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 (R lyzer or by jumpering the board into their application system. The PICkit Serial Analyzer is available separately (order number: DV164122).

resistance of 10 k. Evaluation can be done by:

AB(TYP)

= 10 k) using the PICkit Serial Ana-

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 V is connected to the PCB ground plane. All the passive components that are connected to V

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 V 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 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.

is connected to the PCB power plane, while the pad labeled VSS

, the RxD component footprint

MCU

 2010 Microchip Technology Inc. DS51898A-page 13

+ 29 hidden pages

Microchip Technology MCP42XXEV Evaluation Board User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

Chapter 1. Product Overview

1.1 INTRODUCTION

1.2 WHAT IS THE MCP42XXEV EVALUATION BOARD?

1.3 WHAT THE MCP42XXEV EVALUATION BOARD KIT INCLUDES

Chapter 2. Installation and Operation

2.1 INTRODUCTION

2.2 FEATURES

2.3 GETTING STARTED

2.4 MCP42XXEV EVALUATION BOARD DESCRIPTION

2.4.1 The Hardware