Microchip Technology MCP4725 SOT-23-6 Evaluation Board User guide

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MCP4725

SOT-23-6

Evaluation Board

User’s Guide

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MCUs and dsPIC® DSCs, KEELOQ

code hopping

MCP4725 SOT-23-6 EVALUATION

BOARD USER ’S GUIDE

Table of Contents

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

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

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

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

Recommended Reading........................................................................................3

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

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

Document Revision History................................................................................... 4

Chapter 1. Quick Start Instructions.............................................................................. 5

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

1.2 What is the MCP4725 SOT-23-6 Evaluation Kit .............................................5

1.3 Getting Started with PICkit Serial Analyzer .................................................... 5

Appendix A. Schematics and Board Layouts............................................................21

A.1 Introduction ..................................................................................................21

A.2 Board - Schematic .......................................................................................22

A.3 Board - Top Layer ........................................................................................ 23

A.4 Board - Top Silk Layer .................................................................................24

A.5 Board - Bottom Layer ...................................................................................25

Appendix B. Bill Of Materials (BOM)..........................................................................27

Worldwide Sales and Service ....................................................................................28

MCP4725 SOT-23-6 Evaluation Board User’s Guide

NOTES:

MCP4725 SOT-23-6 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 MCP4725 SOT-23-6 Evaluation Board. Items discussed in this chapter include:

• Document Layout

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Web Site

• Customer Support

• Document Revision History

DOCUMENT LAYOUT

This document describes how to use the MCP4725 SO T-23-6 Evaluation Board as a development tool to emulate and debug firmware o n a target board. The manual la yout is as follows:

• Chapter 1. “Quick Start Instructions ” – this chapter provides an over view of the MCP4725 SOT-23-6 Evaluation Board and instructions on how to program the DAC register and EEPROM of the MCP4725 device.

• Appendix A. “Schematics and Board Layouts” – shows the schematic and layout diagrams for the MCP4725 SOT-23-6 Evaluation Board.

• Appendix B. “Bill Of Materials (BOM)” – lists the parts used to build the MCP4725 SOT-23-6 Evaluation Board.

MCP4725 SOT-23-6 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® IDE User’s Guide

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>

Courier New font:

Plain Courier New Sample source code #define START

Italic Courier New A variable argument file.o, where file can be

Square brackets [ ] Optional arguments mcc18 [options] file

Curly brackets and pipe character: { | }

Ellipses... Replaces repeated text var_name [,

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.

Filenames autoexec.bat File paths c:\mcc18\h Keywords _asm, _endasm, static Command-line options -Opa+, -Opa- Bit values 0, 1 Constants 0xFF, ‘A’

Choice of mutually exclusive arguments; an OR selection

Represents code supplied by user

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[options] errorlevel {0|1}

var_name...] void main (void)

{ ... }

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

Preface

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

Customers should contact their distributor, representative or field application engineer 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

MCP4725 SOT-23-6 Evaluation Board User’s Guide

DOCUMENT REVISION HISTORY

Revision A (October 2007)

• Initial Release of this Document.

MCP4725 SOT-23-6 EVALUATION

BOARD USER ’S GUIDE

Chapter 1. Quick Start Instructions

1.1 INTRODUCTION

The following sections provide an overview of the MCP4725 SOT-23-6 Evaluation Board and Instruction how to program the DAC register and EEPROM of the MCP4725 device using the PICkit Serial Analyzer. The following sections cover the following topics:

• What is the MCP4725 SOT-23-6 Evaluation Board?

• How to use the MCP4725 SOT-23-6 Evaluation Board with the PICkit Serial Analyzer

1.2 WHAT IS THE MCP4725 SOT-23-6 EVALUATION KIT

The MCP4725 SOT-23-6 Evaluation Board contains the MCP4725 single channel 12-Bit Digital-to-Analog Converter (DAC) and I

The purpose of this board is:

• Quick evaluation of the MCP4725 features using the PICkit Serial Analyzer: The user can program the DAC Register or EEPROM using the PICkit Serial Analyzer and measure the MCP4725 device analog output voltage using a voltmeter

• Easy handling of the MCP4725 device in a tiny SOT23-6 package: The MCP4725 device is available in a small SOT-23-6 package. This board makes it easy to handle the small package device for user’s application evaluations. The user can simply connect the J1 pins on the evaluation board to the user’s test board for a quick evaluation of the MCP4725 device. The MCP4725 supports standard mode (100 kHz), fast mode (400 kHz), and high speed mode (3.4 MHz). This evaluation board is using 5 kΩ for the I supports up to 400 kHz. The user can replace the R (less than 1 kΩ) for the high-speed mode (3.4 MHz)

C loading resistors.

C pull-up resistors. This 5 kΩ

and R3 with lower values

1.3 GETTING STARTED WITH PICKIT SERIAL ANALYZER

The user can use the MCP4725 SOT-23-6 Evaluation Board in two different ways: (a) together with the PICkit Serial Analyzer or (b) by connecting this board to the user’s target board directly.

Figure 1-1 shows the MCP4725 SOT- 23-6 Evaluation Board. The SCL, SDA, V

pins in the J1 connector are connected to the MCP47 2 5 de vice .

The MCP4725 SOT-23-6 Evaluation Kit contains two MCP4725 SOT-23-6 Evaluation Boards. This board can easily be programmed using the PICkit Serial Analyzer (DV164122). It is highly recommended that the user order the MCP4725 SOT-23-6 Evaluation Board and the PICkit Serial Analyzer at the same time.

On the MCP4725 SOT-23-6 Evaluation Board, the R resistors for the SDA and SCL, respectively . The user can replace them with their own component values of interest. It is also recommended that these pull-up resistors be removed if the user’s test board has the pull-up resistors already. The MCP4725 SOT-23-6 Eval uation Board also has footprints for additional pull-up resistors (in parallel with the R with their own components.

and R3) and loading capacitors. The user can populate the board

and R3 are the I2C pull-up load

, and

MCP4725 SOT-23-6 Evaluation Board User’s Guide

R3 (Pull-up Resistor for SCL)

MCP4725 in SOT-23-6 package

JP1: A0 selection jumper:

R1 (Pull-up Resistor for SDA)

Picture shown here is connected to the GND (A0 = 0)

Analog Output Terminal (V

OUT

)

VDD Te rminal

Ground Terminal

J1 Connector

FIGURE 1-1: MCP4725 SOT-23-6 Evaluation Board.

Quick Start Instructions

PICkit Serial Analyzer

MCP4725 SOT-23-6 Evaluation Board

USB Cable: Connected between the PicKit Serial analyzer and Personal Computer.

Analog Output Voltage (V

OUT

)

Connected to Voltmeter

1.3.1 Getting Started with PICkit Serial Analyzer

This section describes how to evaluate the MCP4725 device using the PICkit Serial Analyzer.

1.3.1.1 HARDWARE SET-UP

1. Connect the MCP4725 SOT-23-6 Evaluation Board and the PICkit Serial

Analyzer together using the J1 connector.

2. Connect a USB cable between the PICkit Serial Ana lyze r an d a Per so nal

Computer.

3. Connect a Digital Voltmeter to V

SOT-23-6 Evaluation Board. Figure 1-2 shows the connection example.

and GND terminals on the MCP4725

OUT

FIGURE 1-2: MCP4725 SOT-23-6 Evaluation Board Test Set Up.

MCP4725 SOT-23-6 Evaluation Board User’s Guide

1.3.1.2 PICKIT SERIAL ANALYZER PC SOFTWARE SET-UP FOR DAC DEVICE PROGRAMMING AND ANALOG VOLTAGE OUTPUT MEASUREMENT

1. Install the PICkit Serial Analyzer software in your computer.

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

3. Run the PICkit Serial PC Software: It will open up the following graphic user inter-

face (GUI). Click Next > and follow the instructions:

4. Select the I2C Master option radio button for the Communicatio n Mode type and

click the Next > button.

Quick Start Instructions

Note: The MCP4725 SOT-23-6 Evaluation Board has its own pull-up resistors

5. Select either 100 kHz option or 400 kHz option radio button and click the Next > button.

Note: The MCP4725 SOT -2 3-6 Eva l uation Boar d supp or ts the I2C bus data rate

up to 3.4 MHz, but the current version of the PICkit Serial Analyzer only supports the I

6. Select No on Device Pullups and click the Next > button.

C bus data rate up to 400 kHz.

MCP4725 SOT-23-6 Evaluation Board User’s Guide

7. Select the Voltage Source option for the MCP4725 SOT-23-6 Evaluation

Board and click

Case 1: When you use V

If you choose PICkit Serial will power my device option, and the 5 Volt option as shown below , the MCP4725 SOT-23-6 Evaluation Board is powered by the 5 VDC from the PICkit Serial Analyzer through the J1 con nector. In th is case, make sure that the JP2 jumper on the MCP4725 SOT-23-6 Evaluation Board is connected.

You can also click on the Other option and move the slide bar for other than 5volts.

Case 2: When you use your own V

If you want to provide your own V MCP4725 SOT-23-6 Evalu ation Board, then d o not select the PI Ckit Serial will power my device option. In this case, you have to remove the JP2 jumper on the board and provide the V

the Next > button.

from the PICkit Serial Analyzer:

at the VDD terminal.

voltage through the VDD terminal on the

Quick Start Instructions

8. Click the OK button. You have done all PICkit Serial Analyzer Configuration Set-up. You are now ready to program the MCP4725 device using the PICkit Serial Analyzer.

MCP4725 SOT-23-6 Evaluation Board User’s Guide

1.3.2 Creating Script File to program the DAC Register and EEPROM Data

1. From the Communications tab, select the Script option and go to the Script

Builder.

Quick Start Instructions

I2CSTART I2CWRTBYT 03 C0 08 00 I2CSTOP

Script Detail

-----------> This means there are three bytes to send

-----------> 1st Write Byte: Address byte = 1100-0000

-----------> 2nd Write Byte: 0000-1000

-----------> 3rd Write Byte: 0000-0000

2nd Write Byte

3rd Write Byte

1st Write Byte

2. You need to create a script file using the following instructions. a) Type in any script name (i.e., MCP4725_Write) in the space below the Script

Name menu item. b) Type in the following parameters in order in the text box area provided in the

Script Detail box.

Note: You can choose any data you want for the 2nd and 3rd write bytes. If you

use the above write data, the MPC4725 device will output: V

= VDD * 0.5V.

OUT

MCP4725 SOT-23-6 Evaluation Board User’s Guide

3. Programming DAC Register (Fast Mode) a) Change 2nd and 3rd data bytes you want in the Script Detail. b) Click Execute Script Menu item. c) The device gives an analog output voltage (V

the board.

) at the VOUT terminal on

OUT

Quick Start Instructions

I2CSTART I2CWRTBYT 04 C0

80 00 I2CSTOP

Script Detail

-----------> This means Master will send four bytes

-----------> 1st Write Byte: Address byte = 1100-0000

-----------> 2nd Write Byte: 0110-0000

-----------> 3rd Write Byte: 1000-0000

-----------> 4th Write Byte: 0000-0000

1st Write Byte 2nd Write Byte

3rd Write Byte 4th Write Byte

4. Programming DAC Register and EEPROM

a) Type in the following parameters in order in the spaces below the Script

Detail menu and click on the Execute Script button.

MCP4725 SOT-23-6 Evaluation Board User’s Guide

5. Verifying the EEPROM Data.

After sending the EEPROM write command in St ep 4, the device holds the dat a in the EEPROM. The data in the EEPROM is non-volatile. T o check this non-volatile data, you can remove the V back up the V terminal.

from the MCP4725 SOT -23-6 Evaluation Board once, and bring

again. You will see the same analog voltage output at the V

OUT

Quick Start Instructions

Written Data

using a Write Command

Reading Data

using a Read Command

Requesting

3 Bytes

6. Reading the DAC Register Data using the PICkit Serial Analyzer This experiment can be done in two steps:

(a) Write the DAC Register with Fast Mode Command. (b) Send Read Command and see the r esults on th e PICkit Serial Transactions

page.

MCP4725 SOT-23-6 Evaluation Board User’s Guide

Written Data

using a Write Command

Reading Data

using a Read Command

Requesting

5 Bytes

EEPROM Data

DAC

7. Reading both the DAC Register and EEPROM data.

This experiment can be done by two steps:

(a) Write the DAC Register and EEPROM data using a write command. (b) Send Read Command (Request 5 bytes) and see the results on the PICkit

Serial Transactions page.

Quick Start Instructions

1 1 0 0 A2 A1 A0 R/W

Device Code Address Byte *

* Address Byte: A2 = A1 = 0 for Default Samples

A0 = 0 if A0 pin is Grounded

= 1 if A0 pin is tied to V

EXAMPLE:

Write Mode: 0XC0 FOR (A2 = A1 = A0)

0XC2 FOR (A2 = A1 = 0, A0 = TIED TO V

)

Read Mode: 0XC1 FOR (A2 = A1 = A0)

0XC3 FOR (A2 = A1 = 0, A0 = TIED TO V

)

D1D2

0x08

0x00

Address Byte: when A2 = A1 = A0 = 0

DAC Output

REF

4096

--------------------------

5V 2

4096

-------------------- - 2.5V===

ACKStart 00xC0 0 PD1 PD0 D11 D10 D9 D8 D8 D7 D5D6 D4 D3 D0 STOP

ACK

1.3.3 Examples of the MCP4725 Programming

FIGURE 1-3: MCP4725 Device Address Byte.

FIGURE 1-4: Fast Mode (Write Command) for V

= 2.5V when V

OUT

REF

= 5V.

MCP4725 SOT-23-6 Evaluation Board User’s Guide

xSTOPD3 D1D2 D0 ACKxxx

0x00

D4D5

0x60

0x08 = 2

When A2 = A1 = A0 = 0

DAC Output

REF

4096

--------------------------

5V 2

4096

-------------------- - 2.5V===

ACKStart 00xC0 1 1 X X PD1 PD0 X D11D10 D8D9 D7 D6

ACK

FIGURE 1-5: Write Command Example for EEPROM and DAC Register for V V

= 5V.

REF

= 2.5V when

OUT

Appendix A. Schematics and Board Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the MCP4725 SOT-23-6 Evaluation Board:

• Board – Schematic

• Board – Top Layer

• Board – Top Silk Layer

• Board – Bottom Metal Layer

MCP4725 SOT-23-6 EVALUATION

BOARD USER ’S GUIDE

MCP4725 SOT-23-6 Evaluation Board User’s Guide

A.2 BOARD - SCHEMATIC

A.3 BOARD - TOP LAYER

Schematics and Board Layouts

MCP4725 SOT-23-6 Evaluation Board User’s Guide

A.4 BOARD - TOP SILK LAYER

A.5 BOARD - BOTTOM LAYER

Schematics and Board Layouts

MCP4725 SOT-23-6 Evaluation Board User’s Guide

NOTES:

MCP4725 SOT-23-6 EVALUATION

BOARD USER ’S GUIDE

Appendix B. Bill Of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

Qty Reference Description Manufacturer Part Number

2 C1, C2 Not Populated — — 3 GND, VDD

VOUT

1 J1 CONN HEADER 6POS .100 R/A

2 JP1,JP2 CONN HEADER 2POS .100 VERT

2 JP1,JP2 CONN JUMPER SHORTING GOLD

1 PCB RoHS Compliant Bare PCB,

2 R1,R3 RES 4.99K OHM 1/8W 1% 0805 SMD Panasonic 2 R2,R4 Not Populated — — 1 U1 MCP4725_SOT-23-6 Microchip Technology Inc. MCP4725_SOT-23-6 Note 1: The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM

used in manufacturing uses all RoHS-compliant components.

TEST POINT PC COMPACT SMT Keystone Electronics 5016

GOLD

TIN

FLASH

MCP4725 SOT23-6 Eval Board

Molex/Waldom Electronics Corp

Sullins Electronics Corp. SPC02SYAN

— 104-000149

- ECG ERJ-6ENF4991V

22-28-8062

22-28-4020

WORLDWIDE SALES AND SERVICE

AMERICAS

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UK - Wokingham

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10/05/07

Microchip Technology MCP4725 SOT-23-6 Evaluation Board User 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 WHAT IS THE MCP4725 SOT-23-6 EVALUATION KIT

1.3 GETTING STARTED WITH PICKIT SERIAL ANALYZER

A.1 INTRODUCTION

A.2 BOARD - SCHEMATIC

A.3 BOARD - TOP LAYER

A.4 BOARD - TOP SILK LAYER

A.5 BOARD - BOTTOM LAYER

WORLDWIDE SALES AND SERVICE