MCP3422
Evaluation Board
for PICkit™ Serial
User’s Guide
© 2008 Microchip Technology Inc.
DS51781A
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and may be superseded by updates.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
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OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
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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, KEELOQ, 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, PIC32 logo, PowerCal, PowerInfo,
PowerMate, PowerTool, 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.
© 2008, 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.
DS51781A-page ii
© 2008 Microchip Technology Inc.
MCP3422 EVALUATION BOARD FOR
PICkit™ SERIAL 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 ................................................................................... 3
Chapter 1. Quick Start Instructions
1.1 Introduction ..................................................................................................... 5
1.2 Description of the MCP3422 Evaluation Board .............................................. 5
1.3 Getting Started with the PICkit Serial Analyzer .............................................. 6
Appendix A. Schematic and Layouts
A.1 Introduction .................................................................................................. 21
A.2 Board Schematic .......................................................................................... 22
A.3 Board – Top Layer ....................................................................................... 23
A.4 Board – Top Metal Layer ............................................................................. 24
A.5 Board – Bottom Layer ................................................................................. 25
Appendix B. Bill Of Materials (BOM)
Worldwide Sales and Service .................................................................................... 28
© 2008 Microchip Technology Inc.
DS51781A-page iii
MCP3422 Evaluation Board for PICkit™ Serial User’s Guide
NOTES:
DS51781A-page iv
© 2008 Microchip Technology Inc.
MCP3422 EVALUATION BOARD FOR
PICkit™ SERIAL 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
MCP3422 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 MCP3422 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
MCP3422 Evaluation Board and instructions on how to use theMCP3422
Evaluation Board with PICkitTM Serial Analyzer.
• Appendix A. “Schematic and Layouts” – shows the schematic and layout
diagrams for the MCP3422 Evaluation Board.
• Appendix B. “Bill Of Materials (BOM)” – lists the parts used to build the
MCP3422 Evaluation Board.
© 2008 Microchip Technology Inc.
DS51781A-page 1
MCP3422 Evaluation Board for PICkit™ Serial 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
DS51781A-page 2
Examples
File>Save
Press <Enter>, <F1>
var_name [,
var_name...]
void main (void)
{ ...
}
© 2008 Microchip Technology Inc.
Preface
RECOMMENDED READING
This user's guide describes how to use MCP3422 Evaluation Board. Other useful
documents are listed below. 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.
MCP3422 Data Sheet, “18-Bit, Multi-Channel ΔΣ Analog-to-Digital Converter with
I2C™ Interface and On-Board Reference”, DS22088
This data sheet provides detailed information regarding the MCP3422 product family.
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
DOCUMENT REVISION HISTORY
Revision A (November 2008)
• Initial Release of this Document.
© 2008 Microchip Technology Inc.
DS51781A-page 3
MCP3422 Evaluation Board for PICkit™ Serial User’s Guide
NOTES:
DS51781A-page 4
© 2008 Microchip Technology Inc.
MCP3422 EVALUATION BOARD FOR
PICkit™ SERIAL USER’S GUIDE
Chapter 1. Quick Start Instructions
1.1
INTRODUCTION
The following sections provide an overview of the MCP3422 Evaluation Board and
demonstrate how to use it with the PICkit™ Serial Analyzer (P/N: DV164122).
The following topics are covered:
• Description of the MCP3422 Evaluation Board
• How to use the MCP3422 Evaluation Board with the PICkit Serial Analyzer
1.2
DESCRIPTION OF THE MCP3422 EVALUATION BOARD
The MCP3422 Evaluation Board (P/N MCP3422EV) contains a MCP3422 18-Bit
Delta-Sigma Analog-to-Digital Converter (ADC). The MCP3422 is a 2-channel ADC
device with various options. The MCP3422 Evaluation Board has analog input
connection pads and VDD, SDA, and SCL test pads. The user can connect inputs and
test the conversion results using the PICkit Serial Analyzer and its PC graphic user
interface (GUI). The MCP3422 Evaluation Board has the following interface:
• PICkit Serial Analyzer for writing configuration register bits and reading the
conversion data.
Note:
The MCP3422 Evaluation Board can be used without the PICkit Serial
Analyzer as long as the VDD, SCL, and SDA are provided to the board. The
MCP3422 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 for the MCP3422
The I2C device code and address bits of the MCP3422 device are programmed at
factory:
• Device Code: ‘1101’
• A2, A1, A0 Address Bits: the MCP3422 device in the MCP3422 Evaluation Board
uses default setting: (A2, A1, A0) = (0, 0, 0)
• Address Byte = 1101000R/W
© 2008 Microchip Technology Inc.
DS51781A-page 5
MCP3422 Evaluation Board for PICkit™ Serial User’s Guide
FIGURE 1-1:
1.3
Front View of the MCP3422 Evaluation Board.
GETTING STARTED WITH THE PICKIT SERIAL ANALYZER
Figure 1-1 shows the MCP3422 Evaluation Board and Figure 1-2 shows the MCP3422
Evaluation Board and PICkit Serial Analyzer.
The following instructions describe how to use them together:
1. Connect the MCP3422 Evaluation Board’s 6-pin socket to the PICkit Serial
Analyzer, as shown in Figure 1-2.
2. Connect the oscilloscope probes to the SCL and SDA test pins (optional).
3. VDD Selection: You can use the VDD from the PICkit Serial Analyzer or you can
use your own external VDD. The JP1 connector selects the VDD path.
(a) Connect JP1, if using VDD from PICkit Serial Analyzer.
(b) Disconnect JP1 and apply VDD at VDD1 pin, if you are using an external VDD.
4. Connecting VDD: LED D1 turns on when VDD is applied. The PICkit Serial
Analyzer will provide VDD automatically, if it is connected to the PC. Make sure
LED D1 turns on, when you execute the command using the PICkit Serial
Analyzer.
5. Connecting the analog inputs: If you need to measure a single-ended input,
connect the unused pin (example, CHX-) to VSS.
• Connecting the inputs: The MCP3422 Evaluation Board has input pads for
analog inputs for each input channel. You can connect all inputs at the same time
and multiplex the input channel using configuration register settings. You can also
leave the unused channel inputs floating.
DS51781A-page 6
© 2008 Microchip Technology Inc.
Quick Start Instructions
6. Use the PICkit Serial Analyzer PC GUI to send I2C write and read commands.
CAUTION
Each analog input pin has an ESD diode. Certain input conditions can damage the
device. Please follow the conditions below:
(a) Do not apply an input greater than the input range specified by the MCP3422 Data
Sheet.
(b) Apply the input signal after VDD is powered-up.
Personal Computer
USB Cable
Connected between the
PICkit Serial analyzer
and Personal Computer
PICkit Serial Analyzer
Sensor Input
Connectors
Sensor Input
Connectors
MCP3422 Evaluation Board
FIGURE 1-2:
MCP3422 Evaluation Board with the PICkit Serial Analyzer.
© 2008 Microchip Technology Inc.
DS51781A-page 7
MCP3422 Evaluation Board for PICkit™ Serial User’s Guide
1.3.1
PICkit Serial Analyzer PC Software Setup for the MCP3422
Evaluation Board
The following steps describe how to set up and use the PICkit Serial Analyzer PC
Graphic User Interface (GUI).
1. Install the PICkit Serial Analyzer software onto your personal computer (PC).
2. Connect the USB cable between the PICkit Serial Analyzer and the PC.
3. Run the PICkit Serial PC Software. The following graphic user interface (GUI) will
appear.
FIGURE 1-3:
PICkit Serial Analyzer Configuration Wizard Welcome Window.
Click the Next button and follow the instructions.
DS51781A-page 8
© 2008 Microchip Technology Inc.
Quick Start Instructions
4. Select the Communication Mode type: I2C Master, and click the Next button.
FIGURE 1-4:
Step 1 - Communication Mode Selection.
5. Select 100 kHz or 400 kHz. Either one will be fine. Click the Next button.
FIGURE 1-5:
Note:
© 2008 Microchip Technology Inc.
Step 2 - I2C Communication Speed Window.
The MCP3422 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.
DS51781A-page 9
MCP3422 Evaluation Board for PICkit™ Serial User’s Guide
6. Select No on the Enable Pull-ups screen and click the Next button.
Note:
The MCP3422 Evaluation Board has its own pull-up resistors.
FIGURE 1-6:
Step 3 - Device Pullups Window.
7. Select the VDD voltage of the MCP3422 Evaluation Board and click the Next
button.
Case 1: When using VDD from the PICkit Serial Analyzer:
If you choose PICkit Serial will power your device and 5 Volt as shown in
Figure 1-7, the MCP3422 Evaluation Board will be 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 MCP3422 Evaluation Board is connected.
Case 2: When using your own VDD:
You can also provide your own VDD voltage by applying a VDD voltage at the VD1
test point. In this case, make sure that the JP1 jumper is disconnected.
DS51781A-page 10
© 2008 Microchip Technology Inc.
Quick Start Instructions
FIGURE 1-7:
Step 4 - Voltage Source Selection Window.
8. Click the OK button. You have made all the PICkit Serial Analyzer configuration
setups. You are now ready to program the MCP3422 Evaluation Board using the
PICkit Serial Analyzer.
FIGURE 1-8:
© 2008 Microchip Technology Inc.
Configuration Wizard - Finishing Step.
DS51781A-page 11
MCP3422 Evaluation Board for PICkit™ Serial User’s Guide
1.3.2
Creating Script Files
In order to make a communication connection between the PICkit Serial Analyzer and
the MCP3422 Evaluation Board, a script file is needed. The following procedure shows
how to create script files and how to use them.
• In the PICkit Serial Analyzer window, select from the menu Communications>
Script>Script Builder (Figure 1-9).
FIGURE 1-9:
Creating a Script File with Script Builder.
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. You can
now modify the “Script Detail” column parameters by right-clicking the mouse.
How to modify the parameters box in Script Details:
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 available for the selected parameter.
3. Select the desired option and delete or insert the parameter box.
4. Keep the parameters in the order shown in Figure 1-10.
DS51781A-page 12
© 2008 Microchip Technology Inc.
Quick Start Instructions
1.
2.
3.
FIGURE 1-10:
To change value:
• Click this box and type a
new number.
To delete or insert box:
• Choose the box and
right-click the mouse button for
options available
Make sure the listed parameters
in “Script Detail” should be in
exact order as shown here.
Modifying Parameters in Script Builder Window.
4. Change the parameter value.
Script Detail
I2CSTART
I2CWRTBYT
02
D0
9C
I2CSTOP
Note:
© 2008 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 (Configuration Byte): 1001-1100
*
All 6 parameters above must be listed in the same order as shown here.
The parameters above with * are not modifiable.
DS51781A-page 13
MCP3422 Evaluation Board for PICkit™ Serial User’s Guide
2 Bytes to send
Address Byte
Configuration Byte
(9C)
Note:
FIGURE 1-11:
DS51781A-page 14
The “9C” in the configuration byte selects the following options:
- Conversion Mode: Continuous Conversion
- Channel Selection: Channel 1
- Bit Resolution: 18 bits
- Gain Selection: 1x
Script File Example for the I2C Write Command.
© 2008 Microchip Technology Inc.
Quick Start Instructions
1.3.2.2
SAVING THE SCRIPT FILE AND PROGRAMMING THE MCP3422
CONFIGURATION REGISTER
1. Change the 2nd and 3rd data bytes you want in the Script Detail.
2. Type in any script name (i.e., MCP3422_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
MCP3422 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, and try
again until the “Busy” LED turns OFF immediately after sending the I2C
command.
REDUE THIS PLOT
WITY CORRECT
Zoom-in
Write Command with Address bits
FIGURE 1-12:
Zoom-in
Configuration Bits
I2C Write Command Waveforms for the MCP3422.
© 2008 Microchip Technology Inc.
DS51781A-page 15
MCP3422 Evaluation Board for PICkit™ Serial 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
1.
CREATING A SCRIPT FILE TO READ THE CONVERSION DATA
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 with the right mouse button
on the parameter box. You can delete the parameter box or add a new one.
2. Make sure the Script Detail parameters are listed in order as follows:
Script Detail
I2CSTART
I2CWRTBYT
01
D1
I2CRDBYTNLB
5
I2CSTOP
Note:
*
*
------> This means there is one byte for address
------> Address byte with W/R bit = 1101-0001
*
------> 5 bytes to read
*
All 7 parameters above must be listed in order. The parameters above with
* are not modifiable.
Address Byte
Requesting
5 Bytes
FIGURE 1-13:
DS51781A-page 16
Script File Sample to Read Conversion Data.
© 2008 Microchip Technology Inc.
Quick Start Instructions
3. Type in any script name (i.e., MCP3422_Read) in the space below the Script
Name menu.
4. Click the Save Script button.
5. Click the Execute Script button.
.
Note:
At this point, the PICkit Serial transmits the I2C Read Command to the
MCP3422 device. The saved file name will appear in the “Users I2C
Scripts” column, and can be re-used any time by selecting the file name.
6. You can also see the SCL and SDA waveforms using the oscilloscope.
Note:
© 2008 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, and try
again until the “Busy” LED turns OFF immediately after sending the I2C
command.
DS51781A-page 17
MCP3422 Evaluation Board for PICkit™ Serial User’s Guide
Address Byte
Requesting
5 Bytes
Reading Data
using a Read Command
5th Byte: Repeated Byte for Configuration 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:
F907 in hex ( = 63751 in decimal)
Output Voltage=
15.625 μV ( LSB )
63751 × -------------------------------------------- = 0.996 Volts with PGA = 1
PGA
Note that if the differential input voltage is negative (CH- > CH+), the MSB of the first byte will be "1". In this case, the
voltage is calculated after converting the output code to 2's complement and then multiply the LSB.
See Section 4.9 of the MCP3422 Data Sheet (DS22088) for more information.
FIGURE 1-14:
Reading Conversion Results. Note that the Input = 0.996V is applied at Ch.1. The
reading indicates the measured value is 0.996 Volts.
DS51781A-page 18
© 2008 Microchip Technology Inc.
Quick Start Instructions
Zoom-in
Data Bytes = 00F907 (hex)
(a) Read command and outputs. The 3 data bytes are zoomed in for better clarity.
Zoom-in
4th Byte
5th Byte
Configuration Byte (4th) and Repeated Configuration Byte (5th)
(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. The RDY bit becomes “1” in the 5th byte
(repeated byte). This means the device is now in the process of new conversion and the new result is not
ready yet.
© 2008 Microchip Technology Inc.
DS51781A-page 19
MCP3422 Evaluation Board for PICkit™ Serial User’s Guide
1.3.4
Experiment with inputs at CH2
Repeat instructions from Section 1.3.2 “Creating Script Files” to
Section 1.3.3 “Reading the Conversion Data using the PICkit Serial Analyzer” for
the Channel 2 input.
Note:
To write the configuration register for channel 2 input, you can just use the
“MCP3422_Write” file and modify the configuration byte data only.
To read the conversion data, use the same script file for all channels.
DS51781A-page 20
© 2008 Microchip Technology Inc.
MCP3422 EVALUATION BOARD FOR
PICkit™ SERIAL USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP3422
Evaluation Board:
•
•
•
•
Board – Schematic
Board – Top Layer
Board – Top Metal Layer
Board – Bottom Layer
© 2008 Microchip Technology Inc.
DS51781A-page 21
MCP3422 Evaluation Board for PICkit™ Serial User’s Guide
A.2
BOARD SCHEMATIC
DS51781A-page 22
© 2008 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD – TOP LAYER
© 2008 Microchip Technology Inc.
DS51781A-page 23
MCP3422 Evaluation Board for PICkit™ Serial User’s Guide
A.4
BOARD – TOP METAL LAYER
DS51781A-page 24
© 2008 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD – BOTTOM LAYER
© 2008 Microchip Technology Inc.
DS51781A-page 25
MCP3422 Evaluation Board for PICkit™ Serial User’s Guide
NOTES:
DS51781A-page 26
© 2008 Microchip Technology Inc.
MCP3422 EVALUATION BOARD FOR
PICkit™ SERIAL 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
JP1
CONN HEADER 2POS .100 VERT
TIN
Molex/Waldom Electronics
Corp
22-03-2021
1
JP1 Shunt
.100" Shorting Block with Handle
JAMECO VALUEPRO
2012JH-R
1
PCB
RoHS Compliant Bare PCB,
MCP3422 Eval Board for PICKit
Serial
—
104-00228
2
R1, R3
RES 4.99K OHM 1/8W 1% 0805
SMD
Microchip Technology Inc.
ERJ-6ENF4991V
2
R2, R4
DO NOT POPULATE
—
—
1
R5
RES 470 OHM 1/8W 5% 0805 SMD Panasonic - ECG
ERJ-6GEYJ471V
1
U1
2 Channel 18 Bit Data Sigma ADC
Microchip Technology Inc
MCP3422-E/MS
10
VDD1, CH1+,
CH1-, CH2+,
CH2-, SDA,
SCL, GND
TEST POINT PC COMPACT SMT
Keystone Electronics®
5016
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.
© 2008 Microchip Technology Inc.
DS51781A-page 27
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DS51781A-page 28
© 2008 Microchip Technology Inc.