Microchip Technology 的 MCP4725 Daughter Board 规格书

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Q MICROCHIP

MCP4725

PICtail Plus Daughter Board

User’s Guide

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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and may be superseded by updates.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.

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Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB

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• 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.

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• 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

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Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our

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6‘ MICROCHIP

MCP4725 PICtail™ Plus DAUGHTER

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

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

1.2 Description of the MCP4725 PICtail™ Plus Daughter Board ......................... 5

1.3 Getting Started With Explorer 16 Development Board ................................... 6

1.4 Getting Started with PICkit™ Serial Analyzer .............................................. 14

1.5 Examples of The MCP4725 Programming using the

PICkit™ Serial Analyzer ......................................................................... 25

1.6 References ................................................................................................... 26

Appendix A. Schematic and Layouts

A.1 Introduction .................................................................................................. 27

A.2 Board – Schematic ....................................................................................... 28

A.3 Board – Top Layer ....................................................................................... 29

A.4 Board – Top Metal Layer ............................................................................. 30

A.5 Board – Bottom Layer ................................................................................. 31

A.6 Board – Bottom Metal Layer ........................................................................ 32

Appendix B. Bill Of Materials (BOM)

Worldwide Sales and Service .................................................................................... 34

MCP4725 PICtail™ Plus Daughter Board User’s Guide

NOTES:

6‘ MICROCHIP

MCP4725 PICtail™ Plus DAUGHTER

BOARD USER’S GUIDE

Preface

INTRODUCTION

This chapter contains general information that will be useful to know before using the

MCP4725 PICtail™ Plus Daughter 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 PICtail™ Plus Daughter Board as

a development tool to emulate and debug firmware on a target board. The manual lay-

out is as follows:

•Chapter 1. “Quick Start Instructions” – this chapter provides an overview of the

MCP4725 PICtail™ Plus Daughter 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 lay-

out diagrams for the MCP4725 PICtail™ Plus Daughter Board.

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

MCP4725 PICtail™ Plus Daughter Board.

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.

MPLABW Hle>Sa vs

MCP4725 PICtail™ Plus Daughter 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 “Save project before build”

Underlined, italic text with

right angle bracket A menu path File>Save

Bold characters A dialog button Click OK

A tab Click the Power tab

N‘Rnnnn A number in verilog format,

where N is the total number of

digits, R is the radix and n is a

digit.

4‘b0010, 2‘hF1

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

Courier New font:

Plain Courier New Sample source code #define START

Filenames autoexec.bat

File paths c:\mcc18\h

Keywords _asm, _endasm, static

Command-line options -Opa+, -Opa-

Bit values 0, 1

Constants 0xFF, ‘A’

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

any valid filename

Square brackets [ ] Optional arguments mcc18 [options] file

[options]

Curly brackets and pipe

character: { | } Choice of mutually exclusive

arguments; an OR selection errorlevel {0|1}

Ellipses... Replaces repeated text var_name [,

var_name...]

Represents code supplied by

user void main (void)

{ ...

}

Preface

RECOMMENDED READING

This user's guide describes how to use MCP4725 PICtail™ Plus Daughter Board. The

following Microchip documents are available and recommended as supplemental

reference resources.

PICkit™ Serial Analyzer User’s Guide (DS51647)

Consult this document for instructions on how to use the PICkit Serial Analyzer hard-

ware and software.

MCP4725 Data Sheet, “12-Bit DAC with EEPROM Memory in SOT-23-6”

(DS22039)

This data sheet provides detailed information regarding the MCP4725 product family.

MCP4725 SOT-23 Evaluation Board User’s Guide (DS51669)

PIC24FJ128GA010 Family Data Sheet (DS39747)

Explore 16 Development Board User’s Guide (DS51589)

AN1079, “Using the C3 Compiler and the I2C Peripheral to Interface Serial

EEPROMs with dsPIC33F” (DS01079)

PICkit™ Serial Analyze User’s Guide (DS51647)

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

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

MCP4725 PICtail™ Plus Daughter Board User’s Guide

DOCUMENT REVISION HISTORY

Revision A (March 2008)

• Initial Release of this Document.

6‘ MICROCHIP

MCP4725 PICtail™ Plus DAUGHTER

BOARD USER’S GUIDE

Chapter 1. Quick Start Instructions

1.1 INTRODUCTION

The following sections provide an overview of the MCP4725 PICtail™ Plus Daughter

Board and demonstrate how to use (a) the MCP4725 device in a 16-bit MCU environ-

ment and (b) evaluate the MCP4725 device features using the PICkit™ Serial Analyzer

(P/N: DV164122). The MCP4725 PICtail™ Plus Daughter Board is designed to work

with both the Explorer 16 Development Board (P/N: DV164033) and the PICkit™ Serial

Analyzer (P/N: DV164122).

The following topics are covered:

• Description of the MCP4725 PICtail™ Plus Daughter Board

• How to use the MCP4725 PICtail™ Plus Daughter Board with the Explorer 16

Starter Kit

• How to use MCP4725 PICtail™ Plus Daughter Board with the PICkit™ Serial

Analyzer

1.2 DESCRIPTION OF THE MCP4725 PICtail™ Plus DAUGHTER BOARD

The MCP4725 PICtail™ Plus Daughter Board (P/N MCP4725DM-PTPLS) contains an

MCP4725 12-bit Digital-to-Analog Converter (DAC). This daughter board has the fol-

lowing two interfaces:

• Explorer 16 Starter Kit (P/N: DV164033) for 16-bit MCU environment

• PICkit™ Serial Analyzer (P/N: DV164122) for reading and writing the DAC

The user can connect this daughter board to one of the above tools and perform their

own experiments.

The board has test points for SDL, SDA, and VOUT. By connecting an oscilloscope to

these test points (to SCL, SDA, VOUT) or Digital Multimeter to VOUT, the user can exam-

ine the data communications through the I2C™ bus line and observe the resulting DAC

output (VOUT). Refer to Appendix A. “Schematic and Layouts”

1.2.1 I2C Address Bits and A0 Address Bit Selection

The I2C device code and address bits of the MCP4725 device are:

• Device Code: ‘1100’

• A2, A1, A0 Address Bits: ‘00X’, where X is for the A0 bit which is determined by

the logic state of the A0 pin

Note that the first two address bits (A2 and A1) are programmed at factory during

device production and A0 bit is programmed by the user during applications. The A2

and A1 address bits of the MCP4725 device used for the MCP4725 PICtail™ Plus

Daughter Board are programmed at the factory to ‘00’. The JMP1 connector on the

MCP4725 PICtail™ Plus Daughter Board selects the A0 bit. The following conditions

show the A0 bit selection:

• A0 bit = ‘1’ if JMP1 is connected to VDD

• A0 bit = ‘0’ if JMP1 is connected to VSS (Default setting)

• Address bits A2, A1 = ‘00’

SM! VS SCLI V$ Vout .- vom . 7 MCP4725 PlCTail Plus Daughter Board JPI r.“ N m - V25 .

MCP4725 PICtail™ Plus Daughter Board User’s Guide

Based on the above information, the combined device code and address bits for the

I2C Serial Communication are:

• 1100-001W/R: if JMP1 is connected to VDD

• 1100-000W/R: if JMP1 is connected to VSS

•Where W/R is write(“0”) or read (‘1’) bit.

FIGURE 1-1: Front and Back Views of the MCP4725 PICtail™ Plus Daughter

Board.

1.3 GETTING STARTED WITH EXPLORER 16 DEVELOPMENT BOARD

Figure 1-2 shows the MCP4725 PICtail™ Plus Daughter Board with the Explorer 16

Development Board. When they are connected, the user can program the 16-bit

PIC24FJ128 MCU on the Explorer 16 Starter Kit. The Explorer 16 Development Board

sends I2C serial communication commands to the MCP4725 PICtail™ Plus Daughter

Board for the MCP4725 DAC output. The Explorer 16 MCU firmware for this MCP4725

PICtail™ Plus Daughter Board writes to the DAC input register continuously in 1 LSB

increments. The user can see the DAC output (VOUT) changes using an oscilloscope.

Also, a buzzer on the MCP4725 PICtail™ Plus Daughter Board makes sounds driven

by the DAC output (VOUT).

Quick Start Instructions

1.3.1 Connecting to the Explorer 16 Starter Kit

1. Connect the MCP4725 PICtail™ Plus Daughter Board to the J5 socket on the

Explorer 16 Development Board as shown in Figure 1-2.

FIGURE 1-2: Connecting the MCP4725 PICtail™ Plus Daughter Board to the

Explorer 16 Development Board.

1.3.2 Programming the PIC24FJ128 MCU

The Explorer 16 Development Board contains the PIC24FJ128 MCU. The user can

download the firmware to the MCU using the MPLAB ICD2 programmer. Refer to

Chapter 2 of the Explorer 16 Development Board User’s Guide (DS51589) for details

on the programming of the Explorer 16 Development Board.

1.3.2.1 THE PIC24FJ128 MCU FIRMWARE FOR THE MCP4725 PICtail™ Plus

DAUGHTER BOARD

The original firmware for the Explorer 16 Development Board is modified for the

MCP4725 PICtail™ Plus Daughter Board demonstration. The firmware uses most of

the original codes for the Explorer 16 Development Board except the I2C peripheral

control routines for the PIC24FJ128 MCU.

The following four routines are added or modified from the original Explorer 16 Devel-

opment Board firmware.

• PIC24ExplDemo_MCP4725_Main.c

• MCP4725_i2C_Func.c

• Banner_MCP4725.c

• i2C_MCP4725.h

The user can modify the above routines for their own application.

The source code is compiled by using Microchip’s C30 Compiler and the hex code is

programmed to the MCU using the MPLAB ICD 2. Figure 1-3 shows connection of the

MPLAB ICD 2 and the Explorer 16 Development Board. Figure 1-4 shows the MPLAB

IDE programming environment.

MCP4725

PICtail Plus

Daughter

Board

Explorer 16 Development Board (P/N DV164033)

MCP4725 PICtail™ Plus Daughter Board User’s Guide

1.3.2.2 FIRMWARE FLOW CHART FOR THE MCP4725 DAUGHTER BOARD

Figure 1-5 shows the flow chart of the firmware. Once the MCU firmware is pro-

grammed, the user can observe the following events:

1. VOUT changes as the MCU rewrites the DAC codes. See Figure 1-6 for the VOUT

waveform.

2. Audible sounds (Buzzer) if JP4 is connected.

3. I2C data communication (SDA and SCL) waveform over the I2C bus line. See

Figure 1-6 and Figure 1-7.

1.3.3 DAC Output (VOUT)

The MCU sends write commands for EEPROM and DAC input register.

The MCU writes EEPROM only once, but writes continuously the DAC input register.

The EEPROM is written for the VOUT = VDD/2, and the DAC input register is continu-

ously written for the VOUT to be ramp: The DAC input code is written from “000h” to

“FFFh” with 1 LSB increment. When it reaches “FFFh”, resets to “000h” and repeats the

writing from “000h” to “FFFh” with 1 LSB again.

The user can observe the VOUT at the VOUT test pin using a digital voltmeter or

oscilloscope. Figure 1-7 shows the I2C clock (SCL) and data (SDA) signals, and DAC

output waveform.

The DAC input register is written with fast mode write command which does not affect

the EEPROM. The user can confirm the data written in EEPROM (VOUT = VDD/2) by

disconnecting the MCP4725 PICtail™ Plus Daughter Board from the Explorer 16

Development Board. When the board is first powered, the MCP4725 device loads the

EEPROM data to the DAC input register by itself and then outputs an analog voltage

determined by the EEPROM data.

1.3.4 Audible Buzzer

The MCP4725 PICtail™ Plus Daughter Board includes a buzzer. This buzzer is directly

connected to the VOUT. The user can disable the buzzer by disconnecting JP4. The

buzzer sounds also can be adjusted by VR1.

Quick Start Instructions

FIGURE 1-3: MPLAB ICD2 connection to Explorer 16 Development Board with the MCP4725

PICtail™ Plus Daughter Board for programming.

MCP4725 PICtail Plus

Daughter Board

Explorer 16 Development Board

(P/N DV164033) (P/N MCP4725DM-PTPLS)

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MCP4725 PICtail™ Plus Daughter Board User’s Guide

FIGURE 1-4: MPLAB IDE Programming Environment.

Quick Start Instructions

FIGURE 1-5: Flow Chart for the MCP4725 PICtail™ Plus Daughter Board Firmware.

START

POWER-UP

(9V)

SEND I2C WRITE COMMAND

TO WRITE EEPROM DATA FOR

VOUT = VDD/2

TURN ON LEDS (D4, D6, D8, D10)

DAC INPUT REGISTER DATA = DATA + 1 LSB

(VOUT = RAMP FROM 0V TO VDD)

DAC INPUT DATA == 4096 LSB ?

YES

DATA = 0

SEND I2C WRITE COMMAND FOR DAC INPUT REGISTER

MCP4725 PICtail™ Plus Daughter Board User’s Guide

FIGURE 1-6: I2C Write Command Waveforms for the MCP4725.

I2C

Clock Signal

I2C

Data Signal

(SCL)

(SDA)

(b) Fast Write Command

(a) Write DAC Input Register and EEPROM

(DAC Code = 1000-0000-0000)

(DAC Code = 0110-1101-1001)

I2C

Data Signal

(SDA)

I2C

Clock Signal

(SCL)

Expected DAC Output VDD Dn

•

4096

------------------------5 800(hex)

•

4096

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

Expected DAC Output VDD Dn

•

4096

------------------------56D9(hex)

•

4096

--------------------------------- 2.1398V== =

Quick Start Instructions

FIGURE 1-7: I2C SCL, SDA, and VOUT Waveforms while incrementing the DAC code by 1 LSB.

I2C

Clock Signal

I2C

Data Signal

VOUT

at VOUT Pin

Write Data (Dn) = 1111 - 01101111 (binary)

A: Zoomed area for SCL and SDA signals.

(SCL)

(SDA)

for VDD = 5V

VOUT VDD Dn

•

4096

------------------------ 4 . 8 2 3 V==

PICkil USB

MCP4725 PICtail™ Plus Daughter Board User’s Guide

1.4 GETTING STARTED WITH PICKIT™ SERIAL ANALYZER

The user can use the MCP4725 PICtail™ Plus Daughter Board with the PICkit™ Serial

Analyzer by setting up as shown in Figure 1-8.

The following describes how to use them together:

1. Connect the MCP4725 PICtail™ Plus Daughter Board’s J2 pin socket to the

PICkit™ Serial Analyzer.

2. Connect a Digital Voltmeter to VOUT pin and VSS.

FIGURE 1-8: MCP4725 PICtail™ Plus Daughter Board with the PICkit™ Serial Analyzer.

PICkit Serial Analyzer

MCP4725 PICtail Plus Daughter Board

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

Analog Output Voltage (VOUT)

Connected to Voltmeter

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Quick Start Instructions

1.4.1 PICkit™ Serial Analyzer PC Software Set-Up for the MCP4725

Daughter Board

The following steps describe how to set and use the PICkit™ Serial Analyzer PC

Graphic User Interface (GUI) to control the MCP4725 PICtail™ Plus Daughter Board.

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

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

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

interface (GUI). Click the Next button and follow the instructions:

4. Select the Communication Mode type: I2C Master, and click the Next button.

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MCP4725 PICtail™ Plus Daughter Board User’s Guide

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

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

Note: The MCP4725 device supports the I2C bus data rate up to 3.4 MHz, but the

current version of the PICkit™ Serial Analyzer supports the I2C bus data

rate up to 400 kHz only.

Note: The MCP4725 PICtail™ Plus Daughter Board has its own pull-up resistors,

therefore, you don’t need additional pull-up resistors from the PICkit™

Serial Analyzer.

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Quick Start Instructions

7. Select the VDD voltage of the MCP4725 PICtail™ Plus Daughter Board and click

the Next button.

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

If you choose PICkit™ Serial will power my device and 5 Volts as shown

below, the the MCP4725 PICtail™ Plus Daughter Board is powered by the

5V DC from the PICkit™ Serial Analyer through the JP1 jumper. In this case,

make sure that the JP1 jumper on the MCP4725 PICtail™ Plus Daughter 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 TP1. In

this case, make sure that the JP1 jumper is disconnected.

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MCP4725 PICtail™ Plus Daughter Board User’s Guide

8. Click the OK button. You have made all of the PICkit™ Serial Analyzer Configu-

ration Set-ups. You are now ready to program the MCP4725 PICtail™ Plus

Daughter Board using the PICkit™ Serial Analyzer.

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Quick Start Instructions

1.4.2 Creating Script Files

In order to make a communication between the PICkit™ Serial Analyzer and the

MCP4725 PICtail™ Plus Daughter Board, it needs a script file. The following procedure

shows how to create script files and how to use them.

1. Select Communication -----> Script ---> Script Builder.

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MCP4725 PICtail™ Plus Daughter Board User’s Guide

1.4.2.1 CREATING SCRIPT FILES TO PROGRAM DAC REGISTER

1. Click on WriteBlockAddrA8 in “Example I2C Scripts” column.

This will fill in the spaces under Script Detail column.

Modifying the Script Details Parameters:

2. Under the Script Detail column, select the item in the parameter box.

3. Right click the mouse button and an option box appears to the right of your

selection. This gives you the options that are available for the parameter

selected.

4. Select the desired option.

5. Keep the parameters in the same order as shown below:

4. Change the parameter value.

1. Choose this box and right

click the mouse button for

options available.

2. You can also change the

values or delete the boxes.

3. Make sure the listed

parameters in the “Script

Detail” should be in the

exact order as shown here.

I2CSTART *

I2CWRTBYT *

I2CSTOP *

Script Detail

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

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

-----------> 2nd Write Byte: 0000-1111

-----------> 3rd Write Byte: 1111-1111

Note: All 7 parameters above must be listed in order. The parameters with * are

not modifyable. Address bits A2, A1, A0 = 1, 1, 0 if both JMP2 and JMP3

are tied to VDD. You can choose any data you want for the 2nd and 3rd write

bytes. If you use the above write data, the MCP4725 device will output:

VOUT

VDD FFF(hex)(V)

⋅

4096

------------------------------------------------- V DD V()==

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Quick Start Instructions

1.4.2.2 SAVING THE SCRIPT FILE AND PROGRAMMING DAC REGISTER

(FAST MODE)

1. Change 2nd and 3rd data bytes you want in the Script Detail.

2. Type in any script name (i.e., MCP4725_Write) in the space below the Script

Name menu.

3. Click Save Script button.

4. Click Execute Script button.

5. The device provides analog output voltage (VOUT) at the VOUT terminal on the

MCP4725 PICtail™ Plus Daughter Board.

6. VOUT can be monitored by using a voltmeter.

2nd Write Byte

3rd Write Byte

1st Write Byte

Note: At this point, the PICkit™ Serial transmits the Fast Write Command to the

MCP4725 device. The saved file name will appear in Users I2C Scripts

column and can be reused any time by selecting the file name.

Note: When you click on the “Execute Script” menu, the “Busy” LED on the PICkit

Serial Analyzer will momentarily turn on and then turn off. If the LED

remains ON, a communications problem has occurred. Remove the PICkit

Serial Analyzer from the personal computer and recheck the parameter

value in the order of the parameters under the Script Detail column. Try

again until the “Busy” LED goes OFF after executing the write command.

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MCP4725 PICtail™ Plus Daughter Board User’s Guide

1.4.2.3 CREATING SCRIPT FILE TO PROGRAM DAC REGISTER AND

EEPROM

1. Get a new script file by selecting the WriteAddrA8 from the “Example I2C

Scripts” column.

2. Modify the Script Detail column as shown below:

3. Type in the script name (i.e., MCP4725_EEWrite) in the space below the Script

Name menu.

4. Click the Execute Script button.

I2CSTART

I2CWRTBYT

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

Now the device will output VOUT

VDD Dn

⋅

4096

-----------------------5V 800 hex()

⋅

4096

---------------------------------- 2 . 5 V== =

1st Write Byte

2nd Write Byte

3rd Write Byte

4th Write Byte

4 Bytes to Send

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Quick Start Instructions

1.4.3 Verifying the EEPROM Data

One of the important features of the MCP4725 device is non-volatile memory. When

the device is first powered up, it outputs an analog voltage corresponding to the data

in the EEPROM. The user can confirm this feature using the following procedures:

1. Program the EEPROM memory. Refer to Section 1.4.2.2 “Saving the Script

File and Programming DAC Register (Fast Mode)”.

2. Remove power (VDD) from the MCP4725 PICtail™ Plus Daughter Board, or

remove the daughter board from the Explorer 16 Development Board.

3. Connect power (VDD) to the MCP4725 device.

4. You can confirm the VOUT voltage by using a digital multimeter.

1.4.4 Reading the DAC Register Data using the PICkit™ Serial

Analyzer

You can read back the DAC code stored in the DAC register with the following steps:

1. Create a read command script file name as shown below and execute it.

2. The results (DAC code) will appear on the PICkit™ Serial Transactions page.

Requesting

3 Bytes

Written Data

Reading Data

using a Write Command

using a Read Command

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MCP4725 PICtail™ Plus Daughter Board User’s Guide

1.4.4.1 READING BOTH THE DAC REGISTER AND EEPROM DATA:

The following script file can read both DAC input register and EEPROM.

1. Modify the script file as shown below and save it. Click on Execute Script button.

2. The results (DAC code and EEPROM data) will appear on the PICkit™ Serial

Transactions page.

Written Data

Reading Data

using a Write Command

using a Read Command

Requesting

5 Bytes

EEPROM Data

DAC

f \V/ \/ \f/

Quick Start Instructions

1.5 EXAMPLES OF THE MCP4725 PROGRAMMING USING THE PICKIT™

SERIAL ANALYZER

FIGURE 1-9: MCP4725 Device Address Bytes.

FIGURE 1-10: Fast Mode Write Command for VOUT = 2.5V when VREF = 5V.

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 Vdd

Example:

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

0XC2 for (A2 = A1 = 0, A0 = Tied to VDD)

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

0XC3 for (A2 = A1 = 0, A0 = Tied to VDD)

Start 00xC0 0 PD1 PD0 D11 D10 D9 D8 D8 D7 D5D6 D4 D3 D1D2 D0 STOPACK ACK

0x08 0x00

211

Address Byte:

when A2 = A1 = A0 = 0

DAC Output VREF Dn

4096

-------------------------- 5V 211

4096

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

ACK

MCP4725 PICtail™ Plus Daughter Board User’s Guide

FIGURE 1-11: Write Command for EEPROM and DAC Register for VOUT = VDD/2.

Start 0

0xC0 1PD1 PD0 D11 D8 D7 D6 D4

xSTOP

ACK ACK ACK

0x60 0x08 = 211

A2=A1=A0 = 0

When

D3 D1D2 D0 ACK

1D10 D9

xxx

0x00

xx x

DAC Output VREF Dn

4096

-------------------------- 5V 211

4096

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

6‘ MICROCHIP

MCP4725 PICtail™ Plus DAUGHTER

BOARD USER’S GUIDE

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the MCP4725

PICtail™ Plus Daughter Board:

• Board – Schematic

• Board – Top Layer

• Board – Top Metal Layer

• Board – Bottom Layer

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MCP4725 PICtail™ Plus Daughter Board User’s Guide

A.2 BOARD – SCHEMATIC

I CP472 ICToil us aughte Boo M “II

Schematic and Layouts

A.3 BOARD – TOP LAYER

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MCP4725 PICtail™ Plus Daughter Board User’s Guide

A.4 BOARD – TOP METAL LAYER

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Schematic and Layouts

A.5 BOARD – BOTTOM LAYER

CD a. v 6 o o

MCP4725 PICtail™ Plus Daughter Board User’s Guide

A.6 BOARD – BOTTOM METAL LAYER

6‘ MICROCHIP

MCP4725 PICtail™ Plus DAUGHTER

BOARD USER’S GUIDE

Appendix B. Bill Of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

Qty Reference Description Manufacturer Part Number

1 C1 CAP .1UF 16V CERAMIC X7R 0603 Panasonic - ECG ECJ-1VB1C104K

1 C2 CAP 1.0UF 16V CERAMIC X5R 0603 Panasonic - ECG ECJ-1VB1C105K

1 J2 DO NOT POPULATE

CONN HEADER 6POS .100 VERT

TIN

Molex/Waldom Electronics

Corp 22-28-4060

1 JMP1 CONN HEADER 3POS .100" STR

TIN Molex/Waldom Electronics

Corp 90120-0123

3 JMP1, JP1,

JP2 SHUNT LP W/HANDLE 2 POS 30AU

Bag shunts with kit Tyco Electronics/Amp 881545-2

2 JP1, JP2 CONN HEADER 2POS .100 VERT

TIN Molex/Waldom Electronics 22-03-2021

1 PCB RoHS Compliant Bare PCB,

MCP4725 PICtail Plus Daughter

Board

— 104-00186

1 R1 RES 100 OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1000V

2 R2, R3 RES 10.0K OHM 1/10W 1% 0603

SMD Panasonic - ECG ERJ-3EKF1002V

4 R4, R5, R6, R7 RES 0.0 OHM 1/10W 5% 0603 SMD Yageo Corporation RC0603JR-070RL

1 SP1 BUZZER PIEZO 3KHZ 24MM PC MT Mallory Sonalert Products

Inc PK-21N30PQ

5 TP1, TP2, T3

TP4, TP5 PC TEST POINT COMPACT SMT Keystone Electronics 5016

1 U1 12-Bit Digital-to-Analog Converter

with EEPROM Memory in SOT-23-6 Microchip Technology Inc MCP4725A0T-E/CH

1 VR1 POT 5.0K OHM THUMBWHEEL

CERM ST Bourns Inc. 3352T-1-502

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.

Q ‘MICROCHIP

AMERICAS

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

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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

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

ASIA/PACIFIC

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

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

China - Hong Kong SAR

Tel: 852-2401-1200

Fax: 852-2401-3431

China - Nanjing

Tel: 86-25-8473-2460

Fax: 86-25-8473-2470

China - Qingdao

Tel: 86-532-8502-7355

Fax: 86-532-8502-7205

China - Shanghai

Tel: 86-21-5407-5533

Fax: 86-21-5407-5066

China - Shenyang

Tel: 86-24-2334-2829

Fax: 86-24-2334-2393

China - Shenzhen

Tel: 86-755-8203-2660

Fax: 86-755-8203-1760

China - Wuhan

Tel: 86-27-5980-5300

Fax: 86-27-5980-5118

China - Xiamen

Tel: 86-592-2388138

Fax: 86-592-2388130

China - Xian

Tel: 86-29-8833-7252

Fax: 86-29-8833-7256

China - Zhuhai

Tel: 86-756-3210040

Fax: 86-756-3210049

ASIA/PACIFIC

India - Bangalore

Tel: 91-80-4182-8400

Fax: 91-80-4182-8422

India - New Delhi

Tel: 91-11-4160-8631

Fax: 91-11-4160-8632

India - Pune

Tel: 91-20-2566-1512

Fax: 91-20-2566-1513

Japan - Yokohama

Tel: 81-45-471- 6166

Fax: 81-45-471-6122

Korea - Daegu

Tel: 82-53-744-4301

Fax: 82-53-744-4302

Korea - Seoul

Tel: 82-2-554-7200

Fax: 82-2-558-5932 or

82-2-558-5934

Malaysia - Kuala Lumpur

Tel: 60-3-6201-9857

Fax: 60-3-6201-9859

Malaysia - Penang

Tel: 60-4-227-8870

Fax: 60-4-227-4068

Philippines - Manila

Tel: 63-2-634-9065

Fax: 63-2-634-9069

Singapore

Tel: 65-6334-8870

Fax: 65-6334-8850

Taiwan - Hsin Chu

Tel: 886-3-572-9526

Fax: 886-3-572-6459

Taiwan - Kaohsiung

Tel: 886-7-536-4818

Fax: 886-7-536-4803

Taiwan - Taipei

Tel: 886-2-2500-6610

Fax: 886-2-2508-0102

Thailand - Bangkok

Tel: 66-2-694-1351

Fax: 66-2-694-1350

EUROPE

Austria - Wels

Tel: 43-7242-2244-39

Fax: 43-7242-2244-393

Denmark - Copenhagen

Tel: 45-4450-2828

Fax: 45-4485-2829

France - Paris

Tel: 33-1-69-53-63-20

Fax: 33-1-69-30-90-79

Germany - Munich

Tel: 49-89-627-144-0

Fax: 49-89-627-144-44

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

WORLDWIDE SALES AND SERVICE

01/02/08

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