Microchip Technology MCP4728 User’s Guide

MCP4728

Evaluation Board

User’s Guide

Note the following details of the code protection feature on Microchip devices:

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MCUs and dsPIC® DSCs, KEELOQ

code hopping

MCP4728 EVALUATION BOARD

USER ’S GUIDE

Table of Contents

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

Introduction............................................................................................................1

Document Layout..................................................................................................1

Conventions Used in this Guide............................................................................2

Recommended Reading........................................................................................2

The Microchip Web Site........................................................................................ 3

Customer Support.................................................................................................3

Document Revision History...................................................................................3

Chapter 1. Quick Start Instructions

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

1.2 Description of the MCP4728 Evaluation Board ..............................................5

1.3 Getting Started with PICkit Serial Analyzer ....................................................7

Appendix A. Schematic and Layouts

A.1 Introduction ..................................................................................................35

A.2 Board – Schematic .......................................................................................36

A.3 Board – Top Silk, Top Pads and Top Copper .............................................. 37

A.4 Board – Top Copper and Pads .................................................................... 38

A.5 Board – Top Pads and Silk .......................................................................... 39

A.6 Board – Bottom Copper Layer ..................................................................... 40

Appendix B. Bill Of Materials (BOM) Appendix C. MCP4728 Read/Write Commands

C.1 Introduction ..................................................................................................43

Worldwide Sales and Service ....................................................................................46

MCP4728 Evaluation Board User’s Guide

NOTES:

MCP4728 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 MCP4728 Evaluation Board. Items discussed in this chapter include:

• Document Layout

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Web Site

• Customer Support

DOCUMENT LAYOUT

This document describes how to use the MCP47 28 Evalu a tio n Boa rd with PICkitTM Serial Analyzer. The manual layout is as follows:

• Chapter 1. “Quick Start Instructions” – this chapter provide s an overview of the MCP4728 Evaluation Board and instructions on how to use the MCP4728 Evaluation Board with the PICkit

• Appendix A. “Schematic and Layouts” – shows the schematic and layout diagrams for the MCP4728 Evaluation Board.

• Appendix B. “Bill Of Materials (BOM)” – lists the parts used to build the MCP4728 Evaluation Board.

• Appendix C. “MCP4728 Read/Write Commands” – shows the read/write commands for the MCP4728 Evaluation Board.

Serial Analyzer.

MCP4728 Evaluation Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Code (Courier font):

Plain characters Sample code

Filenames and paths Angle brackets: < > Variables <label>, <exp> Square brackets [ ] Optional arguments MPASMWIN [main.asm] Curly brackets and pipe

character: { | } Lowercase characters in

quotes Ellipses... Used to imply (but not show) addi-

0xnnn A hexadecimal number where n is a

Italic characters A variable argument; it can be either a

Interface (Arial font):

Underlined, italic text with right arrow

Bold characters A window or dialog button to click OK, Cancel Characters in angle

brackets < >

Documents (Arial font):

Italic characters Referenced books MPLAB

Choice of mutually exclusive argu-

ments; An OR selection

Type of data

tional text that is not relevant to the

example

hexadecimal digit

type of data (in lowercase characters)

or a specific example (in uppercase

characters).

A menu selection from the menu bar File > Save

A key on the keyboard <Tab>, <Ctrl-C>

#define START c:\autoexec.bat

errorlevel {0|1}

“filename”

list

[“list_option...,

“list_option”]

0xFFFF, 0x007A

char isascii (char, ch);

IDE User’s Guide

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 Guide, 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. Lo cal 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

Preface

DOCUMENT REVISION HISTORY

Revision A (June 2009)

• Initial Release of this Document.

MCP4728 Evaluation Board User’s Guide

NOTES:

MCP4728 EVALUATION BOARD

USER ’S GUIDE

Chapter 1. Quick Start Instructions

1.1 INTRODUCTION

The following sections provide an overview of the MCP4728 Evaluation Board and instructions on how to program the DAC register and the EEPROM of the MCP4728 using the PICkit

• Description of the MCP4728 Evaluation Board

• How to use the MCP4728 Evaluation Board with the PICkit Serial Analyzer

1.2 DESCRIPTION OF THE MCP4728 EVALUATION BOARD

The purpose of the MCP4728 Evaluation Board is to provide an easy way o f evaluating the MCP4728’s performance and functionality with a minimum of work.

The MCP4728 Evaluation Board contains a MCP4728 (which is a 4-channel, 12-bit Digital-to-Analog Converter), an interface conn ector for the PICkit Serial Analyzer, and

C test point terminals.The user can evaluate this board by using the PICkit Serial Analyzer or by providing the I terminals.

Using the MCP4728 Evaluation Board, the user can evaluate the functionality of the MCP4728 device, such as: (a) Writing and reading the DAC registers and EEPROM of each channel, (b) Selecting the reference voltage, (c) Measuring the DAC output voltage, (d) Checking the LDAC

The MCP4728 Evaluation Board is designed to work friendly with the PICkit Serial Analyzer (DV164122). The PICkit Serial Analyzer (P/N: DV164122) is used for writing and reading the DAC configuration and register data. The PICkit Serial Analyzer consists of hardware and PC GUI. It is highly recommended that the users order this MCP4728 Evaluation Board and the PICkit Serial Analyze r at same tim e.

• The MCP4728 supports sta ndard mode (100kHz), fast mode (400 kHz), and high

speed mode (3.4 MHz) of the I has 5 kΩ for the I needs to evaluate the device with high speed mode (3.4 MHz), please replace the R1 and R2 with lower values (less than 1 kΩ).

Serial Analyzer. The following sections cover the topics:

C serial communication signals through the I2C test

pin feature, etc.

C pull-up resistors and supports up to the fast mode. If the user

C serial communications. This evaluation boar d

Note: The MCP4728 Evaluation Board can be used without the PICkit Serial

Analyzer as long as the V connector. This board does not include MCU.

The MCP4728 Evaluation Board has test points for SDL, SDA, and DAC outputs. By connecting an oscilloscope to these I communications through the I V

terminals) using a multimeter. Refer to Appe ndix A. “Schematic and Layouts”.

OUT

2C™

, SCL, and SDA are provided through the J1

C test points, the user can examine the data

bus line and observe the resulting analog output (at

MCP4728 Evaluation Board User’s Guide

FIGURE 1-1: Front View of the MCP4728 Evaluation Board.

TABLE 1-1: TEST TERMINALS ON THE MCP4728 EVALUATION BOARD

Test

Terminals

A DAC channel A output

OUT

B DAC channel B output

OUT

C DAC channel C output

OUT

D DAC channel D output

OUT

SCL This terminal is connected to the I

SDA This terminal is connected to the I

RDY/BUSY

LDAC

This terminal is used to monitor the RDY/BUSY pin of the MCP4728 device.

Access terminal to the LDAC pin of the MCP4728.

S1 Switch to change the logic input to the LDAC

JP1 Jumper to select the V

connected, the V

from the J1 connector is connected. If disconnected, it

selects the V

JP2 Jumper to connect the LDAC pin to VSS. (You can disconnect this jumper

VDD1 V

If the V

is provided from J1 connector (PICkit Serial Analyzer), then this

test point monitors the V

GND Connected to common ground plane of the PC Board.

Note 1: This terminal is used to monitor the SCL or SDA signals. You can also provide the

SCL or SDA signals through these pins.

Description

C SCL pin of the MCP4728.

(See Note 1).

C SDA pin of the MCP4728.

(See Note 1).

input pin. It provides logic “low”

when pressed.

source to the MCP4728 Evaluation Board. If it is

source from VDD1 terminal.

when S1 is used.)

monitoring or connection pin.

voltage. You can also connect a new VDD to this

test terminal.

Quick Start Instructions

1.3 GETTING STARTED WITH PICKIT SERIAL ANALYZER

Figure 1-1 shows the MCP4728 Evaluation Board, and Figure 1-2 shows the connection of the MCP4728 Evaluation Board and PICkit Serial Analyzer.

The following steps describe how to use them together:

1. Connect the MCP4728 Evaluation Board’s 6-pin socket to the PICkit Serial

Analyzer as shown in Figure 1-2.

2. Connect the oscilloscope probes to the SCL and SDA test terminals (optional).

3. Connect a multimeter to one of the DAC’s output test terminal.

4. V

• I

• A2, A1, A0 Address Bits: Pre-programmed to‘000’.

5. Connecting V

6. Use the PICkit Serial Analyzer PC GUI to send I

Selection: Y ou can use the VDD from the PICkit Serial Analyzer or use your

own external V (a) Connect JP1, if using V (b) Disconnect JP1 and apply V

C device code of MCP4728: ‘1100’

Analyzer will provide V

. The JP1 connector selects the VDD path.

from PICkit Serial Analyzer,

at VDD1 pin, if you are using an external VDD.

: LED D1 turns on when VDD is applied. The PICkit Serial

automatically, if it is connected to the PC. Make sure

LED D1 turns on.

C write and read commands.

MCP4728 Evaluation Board User’s Guide

MCP4728 Evaluation Board

Personal

Computer

Connected between the

PICkit Serial Analyzer

and Personal Computer

DAC Output (Channel B)

PICkit Serial Analyzer

USB Cable

FIGURE 1-2: MCP4728 Evaluation Board with the PICkit Serial Analyzer.

Quick Start Instructions

1.3.1 PICkit Serial Analyzer PC Software Setup for the MCP4728

Evaluation Board

The following steps describe how to set up and use the PICkit Serial Analyzer PC Graphic User Interface (GUI).

1. Install the PICkit Serial Analyzer software onto your personal computer (PC).

2. Connect the USB cable between the PICkit Serial Analyzer and the PC.

3. Run the PICkit Serial PC Software: It will open to the following GUI. Click the

Next button and follow the instructions.

FIGURE 1-3: PICkit Serial Analyzer Configuration Wizard Welcome Window.

4. Select the Communication Mode type: I

C Master, and click the Next button.

FIGURE 1-4: Step 1 - Communication Mode Selection.

MCP4728 Evaluation Board User’s Guide

5. Select 100 kHz or 400 kHz. Either one will be fine. Click the Next button.

FIGURE 1-5: Step 2 - I2C Communication Speed Selection.

Note: The MCP4728 device supports the I2C bus data rate up to 3.4 MHz, but the

current version of the PICkit Serial Analyzer supports the I

C bus data rate

up to 400 kHz only.

6. Select No on Enable Pull-ups and click the Next button.

Note: The MCP4728 Evaluation Board has its own pull-up resistors.

FIGURE 1-6: Step 3 - Device Pull-Ups Window.

Quick Start Instructions

7. Select the VDD voltage of the MCP4728 Evaluation Board and click the Next

button.

Case 1: When you use VDD from the PICkit Serial Analyzer:

If you choose PICkit Serial will power your device and 5 V olt s as shown below, the MCP4728 Evaluation Board is powered by the 5V DC from the PICkit Serial Analyzer through the JP1 jumper. In this case, make sure that the JP1 jumper on the MCP4728 Evaluation Board is connected.

Case 2: When you use your own VDD:

You can also provide your own VDD voltage by applying a VDD voltage at VD1 test point. In this case, make sure that the JP1 jumper is disconnected.

FIGURE 1-7: Step 4 - Voltage Source Selection Window.

+ 35 hidden pages

Microchip Technology MCP4728 User’s Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

INTRODUCTION

DOCUMENT LAYOUT

CONVENTIONS USED IN THIS GUIDE

RECOMMENDED READING

THE MICROCHIP WEB SITE

CUSTOMER SUPPORT

DOCUMENT REVISION HISTORY

Chapter 1. Quick Start Instructions

1.1 INTRODUCTION

1.2 DESCRIPTION OF THE MCP4728 EVALUATION BOARD

1.3 GETTING STARTED WITH PICKIT SERIAL ANALYZER