Microchip Technology MCP3425 SOT23-6 Evaluation Board User guide

MCP3425 SOT23-6
Evaluation Board
User’s Guide
© 2009 Microchip Technology Inc. DS51787A
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in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates.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, Accuron, dsPIC, K
EELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
PICSTART, rfPIC, SmartShunt and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.
FilterLab, Linear Active Thermistor, MXDEV, MXLAB, SEEVAL, SmartSensor 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, In-Circuit Serial Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB, MPLINK, mTouch, PICkit, PICDEM, PICDEM.net, PICtail, PIC
32
logo, PowerCal, PowerInfo, PowerMate, PowerT ool, REAL ICE, rfLAB, Select Mode, Total Endurance, 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.
© 2009, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and T empe, 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 memo ry and analog products. In addition, Microchip’s quality system for the desig n and manufacture of development systems is ISO 9001:2000 certified.
®
MCUs and dsPIC® DSCs, KEELOQ
®
code hopping
DS51787A-page ii © 2009 Microchip Technology Inc.
MCP3425 SOT23-6 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
1.1 Introduction .....................................................................................................5
1.2 Description of the MCP3425 SOT23-6 Evaluation Board ..............................5
1.3 Getting Started with PICkit™ Serial Analyzer ................................................7
Appendix A. Schematic and Layouts
A.1 Introduction ..................................................................................................23
A.2 Board – Schematic .......................................................................................24
A.3 Board – Top Layer ....................................................................................... 25
A.4 Board – Top Metal Layer .............................................................................26
A.5 Board – Bottom Layer .................................................................................27
Appendix B. Bill Of Materials (BOM)
Worldwide Sales and Service ....................................................................................30
© 2009 Microchip Technology Inc. DS51787A-page iii
MCP3425 SOT23-6 Evaluation Board User’s Guide
NOTES:
DS51787A-page iv © 2009 Microchip Technology Inc.
MCP3425 SOT23-6 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 MCP3425 SOT23-6 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 MC P34 25 SOT 2 3- 6 Eva lua tio n Boa rd 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 provide s an overview of the MCP3425 SOT23-6 Evaluation Board and instructions on how to program the DAC register and EEPROM of the MCP4725 device.
Appendix A. “Schematic and Layouts” – shows the schematic and layout diagrams for the MCP3425 SOT23-6 Evaluatio n Boar d.
Appendix B. “Bill Of Materials (BOM)” – lists the parts used to build the MCP3425 SOT23-6 Evaluation Board.
© 2009 Microchip Technology Inc. DS51787A-page 1
MCP3425 SOT23-6 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)
{ ... }
DS51787A-page 2 © 2009 Microchip Technology Inc.

RECOMMENDED READING

This user's guide describes how to use the MCP3425 SOT23-6 Evaluation Board with the PICkit Serial Analyzer. 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 hardware and software.
MCP3425 Data Sheet, “16 bit Analog-to-Digital Converter with I On-Board Reference”, DS22072
This data sheet provides detailed information regarding the MCP3425 product.

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
2
C Interface and

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. 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
© 2009 Microchip Technology Inc. DS51787A-page 3
MCP3425 SOT23-6 Evaluation Board User’s Guide

DOCUMENT REVISION HISTORY

Revision A (January 2009)
• Initial Release of this Document.
DS51787A-page 4 © 2009 Microchip Technology Inc.
MCP3425 SOT23-6 EVALUATION
BOARD USER’S GUIDE

Chapter 1. Quick Start Instructions

1.1 INTRODUCTION

The following sections provide an overview of the MCP3425 SOT23-6 Evaluation Board and demonstrate how to use it with the PICkit™ Serial Analyzer (P/N: DV164122).
The following topics are covered:
• Description of the MCP3425 SOT23-6 Evaluation Board
• Using MCP3425 SOT23-6 Evaluation Board with the PICkit Serial Analyzer to evaluate the MCP3425 device.

1.2 DESCRIPTION OF THE MCP3425 SOT23-6 EVALUATION BOARD

The MCP3425 SOT23-6 Evaluation Board (P/N MCP3425EV) contains a MCP3425 16-bit Delta-Sigma Analog-to-Digital Converter (ADC). The MCP3425 is an 16-bit single channel ADC device with various options. The MCP3425 SOT23-6 Evaluation Board has analog input connection p ads and V can connect any sensor input signal to this evaluation board and test the ADC conversion results. The PICkit Serial Analyzer’s PC graphic user interface (GUI) provides the user’s interface for configuration register bits of the MCP3425 and displays the ADC conversion values. The PICkit Serial Analyzer links between the GUI and the MCP3425 SOT23-6 Evaluation Board and provides the I the MCP3425 SOT23-6 Evaluation Board. The user also can use this MCP3425 SOT23-6 Evaluation Board without the PICkit Serial Analyzer by providing the I communication signal to the SDA and SCL test pads on the board.
This evaluation board has the following interfaces:
• PICkit Serial Analyzer (P/N: DV164122) for writing configuration register bits and reading the conversion data.
, SDA, and SCL test pads. The user
DD
2
C communication to
2
C
Note: The user can use this board without the PICkit Serial Analyzer as long as
the V does not include MCU.
The user can monitor the I SDA and SCL test pads. Refer to Appendix A. “Schematic and Layouts”.
© 2009 Microchip Technology Inc. DS51787A-page 5
, SCL, and SDA are provided to the board. This evaluation board
DD
2C
communications by connecting an oscilloscope to the
MCP3425 SOT23-6 Evaluation Board User’s Guide
1.2.1 I2C Address Bits
The I2C device code and address bits of the MCP3425 device in this evaluation board are pre-programmed at factory (Code: 1101000).
FIGURE 1-1: Front and Back Views of the MCP3425 SOT23-6 Evaluation Board.
DS51787A-page 6 © 2009 Microchip Technology Inc.
Quick Start Instructions

1.3 GETTING STARTED WITH PICKIT™ SERIAL ANALYZER

Figure 1-1 shows the MCP3425 SOT23-6 Evaluation Board, while Figure 1-2 shows the evaluation board and the PICkit Serial Analyzer co nn ec tio n.
The following instructions show how to use them together:
1. Connect the MCP3425 SOT23-6 Evaluation Board’s J1 pin socket to the PICkit
Serial Analyzer, as shown in Figure 1-2.
2. Connect oscilloscope probes to SCL and SDA test pins (optional).
3. V
selection: You can use the VDD from the PICkit Serial Analyzer or your own
DD
external V (a) Connect JP1, if using V (b) Disconnect JP1 and apply V
. You can select the VDD path using the JP1 connector:
DD
from PICkit Serial Analyzer.
DD
at the VDD pad, if you are using external VDD.
DD
Note: If you are using external V
4. Connect V
, if external VDD is used.
DD
, connect the external VDD at VDD pad.
DD
Note: Do not connect VDD if you are using the VDD from the PICkit Serial
Analyzer. The PICkit Serial Analyzer provides the V
automatically if it is
DD
connected to the PC.
5. LED D1 is turned on when V
is applied.
DD
Note: If the VDD is provided from the PICkit Serial Analyzer , then the LED may no t
be turned on until you execute a command. See Section 1.3.2.1 “Creating a Script File for Configuration Byte Writing” for executing the I
2
C
command.
6. Connecting analog inputs: If you need to measure single-ended input, connect the unused pin (for example, V
7. Use the PICkit Serial Analyzer PC GUI to send I
-) to VSS.
IN
2
C write and read commands.
See Section 1.3.2.1 “Creating a Script File for Configuration Byte Writing”
8. Execute the PICkit Serial Analyzer Script file and obtain the ADC conversion results. The conversion results app ear on the PICkit Serial Analyzer PC GUI. You can also observe the conversion results using the oscilloscope.
CAUTION
The analog input pin has ESD diodes. Certain input conditions can damage the device. Please pay attention to the following conditions:
(a) Do not apply input greater than the input rang e sp ec ifie d by th e MCP3425 data sheet.
(b) Apply input signal after the V
© 2009 Microchip Technology Inc. DS51787A-page 7
is powered-up.
DD
MCP3425 SOT23-6 Evaluation Board User’s Guide
MCP3425 Evaluation Board
Sensor Input
Connectors
PICkit Serial Analyzer
Personal Computer
USB Cable
Connected between the
and Personal Computer
PICkit Serial analyzer
FIGURE 1-2: MCP3425 SOT23-6 Evaluation Board with the PICkit™ Serial Analyzer.
1.3.1 PICkit™ Serial Analyzer PC Software Set-Up for the MCP3425 Evaluation Board
The following steps describe how to set up and use the PICkit Serial Analyzer PC Graphic User Interface (GUI) to write the configuration bits of the MCP3425 on the MCP3425 SOT23-6 Evaluation Board and read the ADC conversion results.
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; the following graphic user interface (GUI) will
appear. Click the Next button and follow the instructions.
DS51787A-page 8 © 2009 Microchip Technology Inc.
Quick Start Instructions
FIGURE 1-3: PICkit Serial Analyzer Configuration Wizard Welcome Window.
4. Select the Communication Mode type: I
FIGURE 1-4: Step 1 - Communication Mode Selection.
2
C Master, and click the Next button.
© 2009 Microchip Technology Inc. DS51787A-page 9
MCP3425 SOT23-6 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 - I
Note: The MCP3425 device supports the I2C bus data rate up to 3.4 MHz, but the
current version of the PICkit Serial Analyzer supports the I up to 400 kHz only.
6. Select No
Note: The MCP3425 SOT23-6 Evaluation Board has its own pull-up resistors.
on Enable Pull-ups and click the Next button.
2
C Communication Speed Window.
2
C bus data rate
FIGURE 1-6: Step 3 - Device Pullups Window.
DS51787A-page 10 © 2009 Microchip Technology Inc.
Quick Start Instructions
7. Select the VDD voltage of the MCP3425 SOT23-6 Evalua tion 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 Volt as shown below, the MCP3425 SOT23-6 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 MCP3425 SOT23-6 Evaluation Board is connected.
Case 2: When you use your own VDD:
Y ou can also provide your own VDD voltage by applying a VDD voltage at VDD test point on the board. In this case, make sure that the JP1 jumper is disconnected.
FIGURE 1-7: Step 4 - Voltage Source Selection Window.
© 2009 Microchip Technology Inc. DS51787A-page 11
MCP3425 SOT23-6 Evaluation Board User’s Guide
8. Click the OK button. You have made all of the PICkit Serial Analyzer Configura-
tion Set-ups. You are now ready to program the MCP3425 SOT23-6 Evaluation Board using the PICkit Serial Analyzer.
FIGURE 1-8: Configuration Wizard - Finishing Step.
DS51787A-page 12 © 2009 Microchip Technology Inc.
Quick Start Instructions
1.3.2 Creating Script Files
In order to make a communication between the PICkit Serial Analyzer and the MCP3425 SOT23-6 Evaluation Board, a script file is needed. The following procedure shows how to create script files and how to use them.
•Select Communication -> Script -> Script Builder.
FIGURE 1-9: Creating a Script File with Script Builder.
© 2009 Microchip Technology Inc. DS51787A-page 13
MCP3425 SOT23-6 Evaluation Board User’s Guide
1. To change value: Click this box and
type a new value.
2. To delete or insert box:
3. Make sure the listed
are in the exact order
parameters in “Script Detail” as shown here.
Choose the box and right
click the mouse button for
options available.
1.3.2.1 CREATING A SCRIPT FILE FOR CONFIGURATION BYTE WRITING
1. Click on WriteBlockAddrA8 in “Example I
• This will result in filling in the spaces under Script Detail column. Now you can modify the Script Detail column parameters by clicking with the right mouse button.
Modifying the Script Details parameters:
1. Under the Script Detail box, select the item in the parameter box.
2. 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.
3. Select the desired options (delete or insert the parameter box).
4. Keep the parameters in the same order as shown in the image below:
2
C Scripts” column.
FIGURE 1-10: Modifying Parameters in the Script Builder Window.
DS51787A-page 14 © 2009 Microchip Technology Inc.
Quick Start Instructions
I2CSTART I2CWRTBYT 02 D0 98
I2CSTOP
Script Detail
------> This means there are two bytes to send
------> 1st Write Byte: Address byte with W
/R bit = 1101-0000
------> 2nd Write Byte: Configuration byte = 1001-1000
* *
*
5. Change the parameter value.
Note: All 6 parameters above must be listed in the same order as shown here.
The parameters above with * are not modifiable. Address bits (A2, A1, A0) = (0,0,0) for this evaluation board. See the MCP3425 Data Sheet for more information on address bit selection.
© 2009 Microchip Technology Inc. DS51787A-page 15
MCP3425 SOT23-6 Evaluation Board User’s Guide
2 Bytes to send
Address Byte
Configuration Byte
(98)
Note the 98 in the configuration byte selects the following options:
- Conversion Mode: Continuous Conversion
- Bit Resolution: 16 bits
- Gain Selection: 1x
FIGURE 1-11: Script File Example for the I2C Write Command.
DS51787A-page 16 © 2009 Microchip Technology Inc.
Quick Start Instructions
Write Command with Address bits
Configuration Bits
Zoom-in
Zoom-in
1.3.2.2 SAVING THE SCRIPT FILE AND PROGRAMMING THE CONFIGURATION REGISTER
1. Change the 2nd and 3rd data bytes you want in the Script Detail.
2. Type in any scrip t name (i.e., MCP3425_Wr_16Bit) in the sp ace below the Script
Name menu.
3. Click Save Script button.
4. Click Execute Script button.
2
Note: At this point, the PICkit Serial transmits the I
MCP3425 device. The saved file name will appear in Users I2C Scripts column, and can be re-used any time by selecting the file name.
5. You can also see the SCL and SDA waveforms using the oscilloscope.
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 your computer and recheck the parameter values in the order of parameters under th e “Script Detail” column. T ry again until the “Busy” LED goes OFF immediately after executing the write command.
C Write command to the
FIGURE 1-12: I
© 2009 Microchip Technology Inc. DS51787A-page 17
2
C Write Command Waveforms for the MCP3425.
MCP3425 SOT23-6 Evaluation Board User’s Guide
I2CSTART I2CWRTBYT 01 D1 I2CRDBYTNLB
I2CSTOP
Script Detail
------> This means there is one byte to send for address
------> Address byte with W
/R bit = 1101-0001
------> 4 bytes to read
4
* *
*
*
1.3.3 Reading the Conversion Data using the PICkit Serial Analyzer
You can read back the conversion data with the following steps.
1.3.3.1 CREATING A SCRIPT FILE TO READ CONVERSION DATA
1. Click on ReadAddrA8 in “Example I2C Scripts” column.
• This will result in filling in the spaces under the Script Detail column. Now you can modify the parameter boxes (delete or insert) in the Script Detail column with options. The list of options will appear if you click the right mouse but­ton at the parameter box. You can delete the parameter box or add a new one.
• Make sure the “Script Detail” parameters are listed in order, as following:
Note: All 7 parameters above must be listed in the same order as shown here.
The parameters above with * are not modifiable. Address bits (A2, A1, A0) = (0,0,0) for the MCP3425 SOT23-6 Evaluation Board. See the MCP3425 Data Sheet for more information on address bit selections.
DS51787A-page 18 © 2009 Microchip Technology Inc.
Quick Start Instructions
Requesting
4 Bytes
Address Byte
FIGURE 1-13: Script File Sample to Read Conversion Data.
2. Type in any script name (i.e., MCP3425_Read) in the space below the Script Name menu.
3. Click Save Script button.
4. Click Execute Script button.
Note: At this point, the PICkit Serial transmits the I2C Read Command to the
MCP3425 device. The saved file name will appear in Users I2C Scripts column, and can be re-used any time by selecting the file name.
5. You can also see the SCL and SDA waveforms using the oscilloscope.
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 your computer and recheck the parameter values in the order of parameters under th e “Script Detail” column. T ry again until the “Busy” LED goes OFF immediately after executing the read command.
© 2009 Microchip Technology Inc. DS51787A-page 19
MCP3425 SOT23-6 Evaluation Board User’s Guide
Requesting
4 Bytes
4th Byte: Repeated Byte for Configuration byte
3rd byte: Configuration Byte (note that RDYbit is “0”)
2nd byte: Data Byte
1st byte: Data Byte
Output code: 1F50 in hex ( = 8016 in decimal)
Output Voltage: 8016 x 62.5 µV (LSB) = 0.501V
Results:
(note that RDY bit returned to “1” after 4th byte)
* 1 LSB for 16 bit = 62.6 µV * Input at CH1 = 0.501V
Note:
Requesting
4 Bytes
Reading Conversion
Data
FIGURE 1-14: Reading Conversion Results: Note that the Input = 0.501V is applied at Ch.1. The reading indicates the measured value is 0.501V. See Figure 1-15 for waveforms.
DS51787A-page 20 © 2009 Microchip Technology Inc.
Zoom-in
Data Bytes = 0101AD (hex)
Zoom-in
Configuration Byte and Repeated Configuration Byte
(a) Read command and outputs. The 3 data bytes are zoomed in for better clarity.
(b) Read command and outputs. The last two data bytes are zoomed in for better clarity.
3rd Byte
4th Byte
RDY bit
RDY bit
Quick Start Instructions
FIGURE 1-15: Read Command and Data on I2C bus. Note the RDY bit in 3rd byte is “0”. This m eans the conversion data just read is the latest conversion data. After the RDY RDY
bit becomes now “1” in the 4th byte (repeated byte). This m eans the de vice is now in the p rocess of a
new conversion and the latest conversion result is not ready yet.
bit is read out at the 3rd byte, the
© 2009 Microchip Technology Inc. DS51787A-page 21
MCP3425 SOT23-6 Evaluation Board User’s Guide
NOTES:
DS51787A-page 22 © 2009 Microchip Technology Inc.

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the MCP3425 SOT23-6 Evaluation Board:
• Board – Schematic
• Board – Top Layer
• Board – Top Metal Layer
• Board – Bottom Layer
MCP3425 SOT23-6 EVALUATION
BOARD USER ’S GUIDE
© 2009 Microchip Technology Inc. DS51787A-page 23
MCP3425 SOT23-6 Evaluation Board User’s Guide

A.2 BOARD – SCHEMATIC

DS51787A-page 24 © 2009 Microchip Technology Inc.

A.3 BOARD – TOP LAYER

Schematic and Layouts
© 2009 Microchip Technology Inc. DS51787A-page 25
MCP3425 SOT23-6 Evaluation Board User’s Guide

A.4 BOARD – TOP METAL LAYER

DS51787A-page 26 © 2009 Microchip Technology Inc.

A.5 BOARD – BOTTOM LAYER

Schematic and Layouts
© 2009 Microchip Technology Inc. DS51787A-page 27
MCP3425 SOT23-6 Evaluation Board User’s Guide
NOTES:
DS51787A-page 28 © 2009 Microchip Technology Inc.
MCP3425 EVALUATION BOARD
USER ’S GUIDE

Appendix B. Bill Of Materials (BOM)

TABLE B-1: BILL OF MATERIALS
Qty Reference Description Manufacturer Part Number
1 C1 CAP .1UF 25V CERAMIC X7R
0805
1 C2 CAP CERAMIC 10UF 6.3V X5R
0805
1 D1 LED RED ORANGE CLEAR 0805
SMD
1 J1 CONN HEADER 6POS .100 R/A
GOLD
1 PCB RoHS Compliant Bare PCB,
MCP3425 SOT23-6 Eval Board
2 R1, R3 RES 4.99K OHM 1/8W 1% 0805
SMD
R2, R4 DO NOT POPULATE — 1 R5 RES 470 OHM 1/8W 5% 0805 SMD Panasonic - ECG ERJ-6GEYJ471V 1 U1 16-Bit Analog-to-Digital Converter
with I2C Interface and On-Board Reference
7VDD V
GND SCL SDA
VDD
+ VIN-
IN
TEST POINT PC COMPACT SMT Keystone Electronics
Note: 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.
Panasonic® - ECG ECJ-2VB1E104K
Panasonic - ECG ECJ-2FB0J106K
LITE-ON INC L TST-C170EKT
Molex/Waldom Electronics Corp
104-00191
Panasonic - ECG ERJ-6ENF4991V
Microchip Technology Inc. MCP3425A0T-E/CH
®
22-28-8062
5016
© 2009 Microchip Technology Inc. DS51787A-page 29

WORLDWIDE SALES AND SERVICE

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
Atlanta
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
01/02/08
DS51722A-page 30 © 2009 Microchip Technology Inc.
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