Microchip Technology MCP46XXEV Evaluation Board User guide

MCP46XXEV

Evaluation Board

User’s Guide

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MCP46XXEV EVALUATION BOARD

USER’S GUIDE

Table of Contents

Preface ...........................................................................................................................1

Chapter 1. Product Overview

1.1 Introduction .....................................................................................................5

1.2 What is the MCP46XXEV Evaluation Board? ................................................5

1.3 What the MCP46XXEV Evaluation Board Kit Includes ................. .. ...............6

Chapter 2. Installation and Operation

2.1 Introduction .....................................................................................................7

2.2 Features .......... ............... ................................................................................ 8

2.3 Getting Sta rted .... .. .................................................................................. ....... 9

2.4 MCP46XXEV Evaluation Board Description ..................................... .............9

2.5 Configuring The PICkit™ Serial Analyzer ....................................................16

2.6 MCP4661 Demo Steps .................................................................................26

Appendix A. Schematic and Layouts

A.1 Introduction ..................................................................................................31

A.2 Schematics and PCB Layout ................................................................. .. .. ..31

A.3 Board – Sch ematic ... .. ............. .. .. ................................................................. 32

A.4 Board – Top Trace, Silk and Pads ...............................................................33

A.5 Board – Bottom Trace and Pa d s .......... .. ........................... .. .. ....................... 34

A.6 Board – Layer 2 Ground Plane ....................................................................35

A.7 Board – Layer 3 Power Plane ......................................................................36

A.8 Board Layout – Top Components .............. .. .. .. ............................................37

A.9 Board – Bottom Silk, Trace and Pads ........................................................38

Appendix B. Bill of Materials (BOM)

Worldwide Sales and Service ....................................................................................40

MCP46XXEV Evaluation Board User’s Guide

NOTES:

MCP46XXEV 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 p age 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 MCP46XXEV 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 MCP46XXEV 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 MCP46XXEV 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 MCP46XXEV Evaluation Board.

• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the MCP46XXEV Evaluation Board.

MCP46XXEV Evaluation Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following docum entat io n conven tion s:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic chara c ters 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 brac kets < > A key on the keyboard Press <Enter>, <F1>

A menu path File>Save

A tab Click the Power tab

where N is the tota l number of digits, R is th e radi x and n is a digit.

IDE User’s Guide

“Save project before build”

4‘b0010, 2‘hF1

Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the MCP46XXEV Evaluation Board and covers the following topics:

• What is the MCP46XXEV Evaluation Board?

• What the MCP46XXEV Evaluation Board kit includes

1.2 WHAT IS THE MCP46XXEV EVALUATION BOARD?

The MCP46XXEV Evaluation Board allows the system designer to quickly evaluate the operation of Microchip Technology’s MCP4661 Digital Potentiometer device. This device is similar to the following devices:

• MCP4531

• MCP4532

• MCP4541

• MCP4542

• MCP4551

• MCP4552

• MCP4562

• MCP4631

• MCP4632

• MCP4641

• MCP4642

• MCP4651

• MCP4652

• MCP4661

• MCP4662

The board uses the TSSOP20EV generic PCB and has been populated for the MCP4661. The 6-pin header (PICkit™ serial) has been jumpered to the MCP4661’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 MCP46XXEV Evaluation Board.

USER’S GUIDE

MCP46XXEV Evaluation Board User’s Guide

MCP4661-103E/ST installed in U3 (TSSOP-14 package bottom aligned to TSSOP-20 footprint)

Through hole Test Point (Orange) Wiper 1

Connected to Ground Plane

0 Ω

4661

Connected to Power Plane

0 Ω

10kΩ

0 Ω

Through hole Test Point (Orange) Wiper 0

Two Blue Wire Jumpers to connect

PICkit™ Serial interface (I device pins

FIGURE 1-1: MCP46XXEV Evaluation Board Using the TSSOP20EV Evaluation Board (MCP4661 installed in U3).

C) to

0 Ω

1x6 Male Header, with 90° right angle

1.3 WHAT THE MCP46XXEV EVALUATION BOARD KIT INCLUDES

This MCP46XXEV Evaluation Board kit includes:

• MCP46XXEV 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 MCP46XXEV Evaluation Board allows the system designer to quickly evaluate the operation of the MCP4661 10 kΩ (-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 MCP4661 device performance, but is affected by the jumper lead length and the EM noise that the jumpers pick up.

The MCP4661 has two resistor networks. The device’s Resistor Network 0 has been configured in a Potentiometer mode with the A terminal connected to V resistor and the B terminal connected to V be evaluated for rheostat operation.

The MCP46XXEV 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 kΩ, 50 kΩ, or 100 kΩ) 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 MCP46XXEV 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.

MCP46XXEV EVALUATION BOARD

USER’S GUIDE

through a 0Ω

with a 0Ω resistor . Resistor Network 1 can

MCP46XXEV Evaluation Board User’s Guide

2.2 FEATURES

The MCP46XXEV Evaluation Board has the following features:

• MCP4661-103E/ST is installed

•0Ω resistors connect MCP4661 V ground plane (see Figure 2-2)

•0Ω resistors connect MCP4661’s Resistor Network 0 A terminal signal to power plane, resistor network is in a voltage divider configuration (see Figure 2-2)

•0Ω resistors connect MCP4661’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 MCP4661 10 kΩ

• 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 MCP4661 10 kΩ

• PICkit Serial Analyzer / PICkit 2 Programming (ICSP™) Header

and VSS signals to the appropriate power or

)

Installation and Operation

2.3 GETTING STARTED

The MCP46XXEV Evaluation Board allows quick evaluation of the MCP4661-103E/ST device. The understanding of the device characteristics (such as the resistor network) is applicable to any of the devices in the MCP46XX family. The MCP4661-103 device has a typically R

• Using the PICkit Serial Analyzer for interface communication

• Jumpering the MCP46XXEV Evaluation Board into your application circuit to control the MCP4661-103 device

This user guide will discuss the steps needed to evaluate the MCP4661-103E/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 MCP4661, based on the devices SPI communication protocol format.

2.4 MCP46XXEV EVALUATION BOARD DESCRIPTION

The MCP46XXEV Eval uati on Boa rd uses the flexibl e TSSO P 20E V Ev aluati on Boa rd PCB. This simple evaluation board allows the system designer to quickly evaluate the operation of the MCP4661-103 device (R Analyzer or by jumpering the board into their application system. The PICkit Serial Analyzer is available separately (order number: DV164122).

resistance of 10 kΩ. Evaluation can be done by:

AB(TYP)

= 10 k Ω) using the PICkit Serial

2.4.1 The Hardware

Figure 2-2 shows the component layout of the MCP46XXEV 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 MCP4661 is bottom aligned in the U3 footprint so that the interface signals are on the same U3 package pins as future device. This is planned to be similar to 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

MCP46XXEV Evaluation Board User’s Guide

P1 P2 P9

PICkit™ Serial / ICSP™

Interface

VSS SDI SCK SDO

VSS SDA SCL NC

DIP-20 (1)

P20

P19

P12

P11

Requires blue wire jumpering to connect the

™ Interface

PICkit to the selected device

P19

P10

TSSOP-20 (1)

P20

P12

SSOP-20

P10

VIA1

9 10

XTAL

VIA2

P19

P11

19U

19D

20U

P20

20D

PIC® Circuitry (bottom of PCB)

Note: The MCP46X1 device (TSSOP-14 footprint) will be bottom aligned to the TSSOP-20

footprint.

FIGURE 2-1: TSSOP20EV Evaluation Board Circuit.

+ 30 hidden pages

Microchip Technology MCP46XXEV Evaluation Board User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Trademarks

Preface

Chapter 1. Product Overview

1.1 INTRODUCTION

1.2 WHAT IS THE MCP46XXEV EVALUATION BOARD?

1.3 WHAT THE MCP46XXEV EVALUATION BOARD KIT INCLUDES

Chapter 2. Installation and Operation

2.1 INTRODUCTION

2.2 FEATURES

2.3 GETTING STARTED

2.4 MCP46XXEV EVALUATION BOARD DESCRIPTION

2.4.1 The Hardware