MCP3421 SOT23-6
Evaluation Board
User’s Guide
© 2009 Microchip Technology Inc.
DS51793A
Note the following details of the code protection feature on Microchip devices:
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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
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•
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
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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
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Information contained in this publication regarding device
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and may be superseded by updates. It is your responsibility to
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Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
PICSTART, rfPIC, SmartShunt and UNI/O are registered
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Company are registered trademarks of Microchip Technology
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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, PIC32 logo, PowerCal, PowerInfo,
PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total
Endurance, WiperLock and ZENA are trademarks of
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SQTP is a service mark of Microchip Technology Incorporated
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All other trademarks mentioned herein are property of their
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© 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
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
DS51793A-page ii
© 2009 Microchip Technology Inc.
MCP3421 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 MCP3421 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 Metal Layer ........................................................................ 27
Appendix B. Bill Of Materials (BOM)
Worldwide Sales and Service .................................................................................... 30
© 2009 Microchip Technology Inc.
DS51793A-page iii
MCP3421 SOT23-6 Evaluation Board User’s Guide
NOTES:
DS51793A-page iv
© 2009 Microchip Technology Inc.
MCP3421 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® IDE on-line help.
Select the Help menu, and then Topics to open a list of available on-line help files.
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP3421 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 MCP3421 SOT23-6 Evaluation Board as a
development tool to emulate and debug firmware on a target board. The manual layout
is as follows:
• Chapter 1. “Quick Start Instructions” – this chapter provides an overview of the
MCP3421 SOT23-6 Evaluation Board and instructions on how to obtain the ADC
conversion results using the PICKit Serial Analyzer.
• Appendix A. “Schematic and Layouts” – shows the schematic and layout
diagrams for the MCP3421 SOT23-6 Evaluation Board.
• Appendix B. “Bill Of Materials (BOM)” – lists the parts used to build the
MCP3421 SOT23-6 Evaluation Board.
© 2009 Microchip Technology Inc.
DS51793A-page 1
MCP3421 SOT23-6 Evaluation Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Represents
Referenced books
Emphasized text
A window
A dialog
A menu selection
A field name in a window or
dialog
A menu path
MPLAB® IDE User’s Guide
...is the only compiler...
the Output window
the Settings dialog
select Enable Programmer
“Save project before build”
A dialog button
A tab
A number in verilog format,
where N is the total number of
digits, R is the radix and n is a
digit.
A key on the keyboard
Click OK
Click the Power tab
4‘b0010, 2‘hF1
Italic Courier New
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
Constants
A variable argument
Square brackets [ ]
Optional arguments
Curly brackets and pipe
character: { | }
Ellipses...
Choice of mutually exclusive
arguments; an OR selection
Replaces repeated text
#define START
autoexec.bat
c:\mcc18\h
_asm, _endasm, static
-Opa+, -Opa0, 1
0xFF, ‘A’
file.o, where file can be
any valid filename
mcc18 [options] file
[options]
errorlevel {0|1}
Initial caps
Quotes
Underlined, italic text with
right angle bracket
Bold characters
N‘Rnnnn
Text in angle brackets < >
Courier New font:
Plain Courier New
Represents code supplied by
user
DS51793A-page 2
Examples
File>Save
Press <Enter>, <F1>
var_name [,
var_name...]
void main (void)
{ ...
}
© 2009 Microchip Technology Inc.
Preface
RECOMMENDED READING
This user's guide describes how to use the MCP3421 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.
MCP3421 Data Sheet, “18-Bit Analog-to-Digital Converter with I2C Interface and
On-Board Reference”, DS22003
This data sheet provides detailed information regarding the MCP3421 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
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
© 2009 Microchip Technology Inc.
DS51793A-page 3
MCP3421 SOT23-6 Evaluation Board User’s Guide
DOCUMENT REVISION HISTORY
Revision A (January 2009)
• Initial Release of this Document.
DS51793A-page 4
© 2009 Microchip Technology Inc.
MCP3421 SOT23-6 EVALUATION
BOARD USER’S GUIDE
Chapter 1. Quick Start Instructions
1.1
INTRODUCTION
The following sections provide an overview of the MCP3421 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 MCP3421 SOT23-6 Evaluation Board
• Using MCP3421 SOT23-6 Evaluation Board with the PICkit Serial Analyzer to
evaluate the MCP3421 device
1.2
DESCRIPTION OF THE MCP3421 SOT23-6 EVALUATION BOARD
The MCP3421 SOT23-6 Evaluation Board (P/N MCP3421EV) contains a MCP3421
18-bit Delta-Sigma Analog-to-Digital Converter (ADC). The MCP3421 is an 18-bit
single channel ADC device with various options. The MCP3421 SOT23-6 Evaluation
Board has analog input connection pads and VDD, SDA, and SCL test pads. The user
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 writing configuration register bits of the MCP3421 and
displays the ADC conversion values. The PICkit Serial Analyzer links between the GUI
and the MCP3421 SOT23-6 Evaluation Board, and provides the I2C communication
PC to the MCP3421 SOT23-6 Evaluation Board. The user also can use this MCP3421
SOT23-6 Evaluation Board without the PICkit Serial Analyzer by providing the I2C
communication signal to the SDA and SCL test pads on the board.
This evaluation board has the following interface:
• PICkit Serial Analyzer (P/N: DV164122) for writing configuration register bits and
reading the conversion data.
Note:
The user can use this board without the PICkit Serial Analyzer as long as
the VDD, SCL, and SDA are provided to the board. This evaluation board
does not include MCU.
The user can monitor the I2C communications by connecting an oscilloscope to the
SDA and SCL test pads. Refer to Appendix A. “Schematic and Layouts”.
1.2.1
I2C Address Bits
The I2C device code and address bits of the MCP3421 device on this board are
“1101000”. These bits are programmed at the factory during production.
© 2009 Microchip Technology Inc.
DS51793A-page 5
MCP3421 SOT23-6 Evaluation Board User’s Guide
FIGURE 1-1:
Board.
DS51793A-page 6
Front and Back Views of the MCP3421 SOT23-6 Evaluation
© 2009 Microchip Technology Inc.
Quick Start Instructions
1.3
GETTING STARTED WITH PICKIT SERIAL ANALYZER
Figure 1-1 shows the MCP3421 SOT23-6 Evaluation Board and Figure 1-2 shows the
Evaluation Board and PICkit Serial Analyzer connection.
The following steps describe how to use them together:
1. Connect the MCP3421 SOT23-6 Evaluation Board’s J1 pin socket to the PICkit
Serial Analyzer as shown in Figure 1-2.
2. Connect the oscilloscope probes to SCL and SDA test pins (optional).
3. VDD selection: You can use the VDD from the PICkit Serial Analyzer or use your
own external VDD. You can select the VDD path using the JP1 connector:
(a) Connect JP1, if using VDD from PICkit Serial Analyzer,
(b) Disconnect JP1 and apply VDD at VDD pin, if you are using external VDD.
Note:
If you are using external VDD, connect the external VDD at VDD pad).
4. Connect VDD, if external VDD is used.
Note:
Do not connect VDD if you are using VDD from the PICkit Serial Analyzer.
The PICkit Serial Analyzer provides the VDD automatically if it is connected
to PC.
5. LED D1 turns on when VDD is applied.
Note:
If the VDD is provided from the PICkit Serial Analyzer, then the LED may not
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 I2C
command.
6. Connecting analog inputs: If you need to measure single-ended input, connect
the unused pin (example, VIN-) to VSS.
7. Use the PICkit Serial Analyzer PC GUI to send I2C 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 appear 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 range specified by the MCP3421
data sheet.
(b) Apply input signal after VDD is powered-up.
© 2009 Microchip Technology Inc.
DS51793A-page 7
MCP3421 SOT23-6 Evaluation Board User’s Guide
Personal Computer
USB Cable
Connected between the
PICkit Serial Analyzer
and Personal Computer
PICkit Serial Analyzer
Sensor Input
Connectors
MCP3421 Evaluation Board
FIGURE 1-2:
DS51793A-page 8
MCP3421 SOT23-6 Evaluation Board with the PICkit Serial Analyzer.
© 2009 Microchip Technology Inc.
Quick Start Instructions
1.3.1
PICkit Serial Analyzer PC Software Set-Up for the MCP3421
SOT23-6 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 MCP3421 on the
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.
FIGURE 1-3:
4. Select the
FIGURE 1-4:
© 2009 Microchip Technology Inc.
PICkit Serial Analyzer Configuration Wizard Welcome Window.
I2C
Master option as communication mode, and click the Next button.
Step 1 - Communication Mode Selection.
DS51793A-page 9
MCP3421 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:
Note:
Step 2 - I2C Communication Speed Window.
The MCP3421 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.
6. Select No on Enable Pull-ups, and click the Next button.
Note:
The MCP3421 SOT23-6 Evaluation Board has its own pull-up resistors,
therefore, you don’t need additional pull-up resistors from the PICkit Serial
Analyzer.
FIGURE 1-6:
DS51793A-page 10
Step 3 - Device Pullups Window.
© 2009 Microchip Technology Inc.
Quick Start Instructions
7. Select the VDD voltage of the MCP3421 SOT23-6 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 my device and 5 Volt as shown below,
the MCP3421 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 MCP3421 SOT23-6 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 the VDD
test point on the board. In this case, make sure the JP1 jumper is disconnected.
FIGURE 1-7:
© 2009 Microchip Technology Inc.
Step 4 - Voltage Source Selection Window.
DS51793A-page 11
MCP3421 SOT23-6 Evaluation Board User’s Guide
8. Click the OK button. You have made all of the PICkit Serial Analyzer configuration set-ups. You are now ready to program the MCP3421 SOT23-6 Evaluation
Board using the PICkit Serial Analyzer.
FIGURE 1-8:
DS51793A-page 12
Configuration Wizard - Finishing Step.
© 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
MCP3421 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:
© 2009 Microchip Technology Inc.
Creating a Script File with Script Builder.
DS51793A-page 13
MCP3421 SOT23-6 Evaluation Board User’s Guide
1.3.2.1
CREATING A SCRIPT FILE FOR CONFIGURATION BYTE WRITING
1. Click on WriteBlockAddrA8 in “Example I2C Scripts” column.
• This will result in filling in the spaces under the 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, displaying 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 below.
1. To change value:
Click this box and
type a new value.
2. To delete or insert box:
Choose the box and right
. click the mouse button for
options available.
3. Make sure the listed
parameters in “Script Detail”
are in the exact order
as shown here.
FIGURE 1-10:
DS51793A-page 14
Modifying Parameters in the Script Builder Window.
© 2009 Microchip Technology Inc.
Quick Start Instructions
5. Change the parameter value.
Script Detail
I2CSTART
I2CWRTBYT
02
D0
9C
I2CSTOP
Note:
© 2009 Microchip Technology Inc.
*
*
------> This means there are two bytes to send
------> 1st Write Byte: Address byte with W/R bit = 1101-0000
------> 2nd Write Byte: 1001-1100
*
All 6 parameters above must be listed in the same order as shown here.
The parameter above with * are not modifiable. Address bits
(A2, A1, A0) = (0,0,0) for this evaluation board. See the MCP3421 Data
Sheet for more information on address bit selection.
DS51793A-page 15
MCP3421 SOT23-6 Evaluation Board User’s Guide
2 Bytes to send
Address Byte
Configuration Byte
(9C)
Note that the “9C” in the configuration byte selects the following options:
- Conversion Mode: Continuous Conversion
- Bit Resolution: 18 bits
- Gain Selection: 1x
FIGURE 1-11:
DS51793A-page 16
Script File Example for the I2C Write Command.
© 2009 Microchip Technology Inc.
Quick Start Instructions
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 script name (i.e., MCP3421_Write) in the space below the Script
Name menu.
3. Click the Save Script button.
4. Click the Execute Script button.
Note:
At this point, the PICkit Serial transmits the I2C Write Command to the
MCP3421 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 re-check the parameter values
including the order of parameters under the “Script Detail” column. Try
again until the “Busy” LED goes OFF immediately after executing the write
command.
Zoom-in
Write Command with Address bits
FIGURE 1-12:
Zoom-in
Configuration Bits
I2C Write Command Waveforms for the MCP3421.
© 2009 Microchip Technology Inc.
DS51793A-page 17
MCP3421 SOT23-6 Evaluation Board User’s Guide
1.3.3
Reading the Conversion Data using the PICkit™ Serial Analyzer
You can read back the conversion data by following the next steps.
1.3.3.1
CREATING A SCRIPT FILE TO READ THE 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 you have the “Script Detail” parameters are listed in order as
follows:
Script Detail
I2CSTART
*
I2CWRTBYT
*
------> This means there is one byte for address
01
D1
------> Address byte with W/R bit = 1101-0001
I2CRDBYTNLB *
------> 5 bytes to read
5
I2CSTOP
*
Note:
DS51793A-page 18
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 MCP3421 in this evaluation board. See the
MCP3421 Data Sheet for more information on address bit selection.
© 2009 Microchip Technology Inc.
Quick Start Instructions
Address Byte
Requesting
5 Bytes
FIGURE 1-13:
Script File Sample to Read Conversion Data.
2. Type in any script name (i.e., MCP3421_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
MCP3421 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:
© 2009 Microchip Technology Inc.
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 re-check the parameter values
including the order of parameters under the “Script Detail” column. Try
again until the “Busy” LED goes OFF immediately after executing the read
command.
DS51793A-page 19
MCP3421 SOT23-6 Evaluation Board User’s Guide
Requesting
5 Bytes
Reading Conversion
Data
5th Byte: Repeated Byte for Configuration byte
(note that RDY bit returned to “1” after 4th byte)
4th byte: Configuration Byte (note that RDYbit is “0”)
3rd byte: Data Byte
2nd byte: Data Byte
1st byte: Data Byte
Results:
Output code: 101AD in hex (= 65965 in decimal)
Output Voltage: 65865 x 15.625 mV (LSB) = 1.0307 V with PGA = 1
PGA
Note:
* 1 LSB with 18 bit resolution option: 15.625 µV
FIGURE 1-14:
Reading Conversion Results: Note that the single ended Input = 1.0307V is applied at
Ch.1. The reading indicates the measured value is 1.0307V. See Figure 1-15 for waveforms.
DS51793A-page 20
© 2009 Microchip Technology Inc.
Quick Start Instructions
Zoom-in
Data Bytes = 0101AD (hex)
(a) Read command and outputs. The 3 data bytes are zoomed in for better clarity.
Zoom-in
5th Byte
4th Byte
RDY bit
RDY bit
Configuration Byte and Repeated Configuration Byte
(b) Read command and outputs. The last two data bytes are zoomed in for better clarity.
FIGURE 1-15:
Read Command and Data on I2C bus. Note the RDY bit in 4th byte is “0”. This means
the conversion data just read is the latest conversion data. After the RDY bit is read out at the 4th byte, the
RDY bit becomes “1” in the 5th byte (repeated byte). This means the device is now in the process of a new
conversion and the latest conversion result is not ready yet.
© 2009 Microchip Technology Inc.
DS51793A-page 21
MCP3421 SOT23-6 Evaluation Board User’s Guide
NOTES:
DS51793A-page 22
© 2009 Microchip Technology Inc.
MCP3421 SOT23-6 EVALUATION
BOARD USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP3421
SOT23-6 Evaluation Board:
•
•
•
•
Board – Schematic
Board – Top Layer
Board – Top Metal Layer
Board – Bottom Layer
© 2009 Microchip Technology Inc.
DS51793A-page 23
MCP3421 SOT23-6 Evaluation Board User’s Guide
A.2
BOARD – SCHEMATIC
DS51793A-page 24
© 2009 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD – TOP LAYER
© 2009 Microchip Technology Inc.
DS51793A-page 25
MCP3421 SOT23-6 Evaluation Board User’s Guide
A.4
BOARD – TOP METAL LAYER
DS51793A-page 26
© 2009 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD – BOTTOM METAL LAYER
© 2009 Microchip Technology Inc.
DS51793A-page 27
MCP3421 SOT23-6 Evaluation Board User’s Guide
NOTES:
DS51793A-page 28
© 2009 Microchip Technology Inc.
MCP3421 SOT23-6 EVALUATION
BOARD USER’S GUIDE
Appendix B. Bill Of Materials (BOM)
TABLE B-1:
Qty
BILL OF MATERIALS
Reference
Description
Manufacturer
®
Part Number
1
C1
CAP .1UF 25V CERAMIC X7R
0805
Panasonic - ECG
ECJ-2VB1E104K
1
C2
CAP CERAMIC 10UF 6.3V X5R
0805
Panasonic - ECG
ECJ-2FB0J106K
1
D1
LED RED ORANGE CLEAR 0805
SMD
LITE-ON INC
LTST-C170EKT
1
J1
CONN HEADER 6POS .100 R/A
TIN
Molex/Waldom® Electronics
Corp
22-05-2061
1
PCB
RoHS Compliant Bare PCB,
MCP3421EV
2
R1,R3
RES 4.99K OHM 1/8W 1% 0805
SMD
2
R2,R4
DO NOT POPULATE
1
R5
RES 470 OHM 1/8W 5% 0805 SMD Panasonic - ECG
ERJ-6GEYJ471V
1
U1
18-Bit Analog-to-Digital Converter
with I2C Interface and On-Board
Reference
Microchip Technology Inc.
MCP3421A0T-E/OT
7
VDD Vin+ Vin- TEST POINT PC COMPACT SMT
GND SCL SDA
VDD
Keystone Electronics®
5016
Note:
—
Panasonic - ECG
—
104-00124
ERJ-6ENF4991V
—
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.
© 2009 Microchip Technology Inc.
DS51793A-page 29
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01/16/09
DS51793A-page 30
© 2009 Microchip Technology Inc.