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: • 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 Trademarks applications and the like is provided only for your convenience The Microchip name and logo, the Microchip logo, Accuron, and may be superseded by updates. It is your responsibility to dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, ensure that your application meets with your specifications. PICSTART, rfPIC, SmartShunt and UNI/O are registered MICROCHIP MAKES NO REPRESENTATIONS OR trademarks of Microchip Technology Incorporated in the WARRANTIES OF ANY KIND WHETHER EXPRESS OR U.S.A. and other countries. IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, FilterLab, Linear Active Thermistor, MXDEV, MXLAB, INCLUDING BUT NOT LIMITED TO ITS CONDITION, SEEVAL, SmartSensor and The Embedded Control Solutions QUALITY, PERFORMANCE, MERCHANTABILITY OR Company are registered trademarks of Microchip Technology FITNESS FOR PURPOSE. Microchip disclaims all liability Incorporated in the U.S.A. arising from this information and its use. Use of Microchip Analog-for-the-Digital Age, Application Maestro, CodeGuard, devices in life support and/or safety applications is entirely at dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN, the buyer’s risk, and the buyer agrees to defend, indemnify and ECONOMONITOR, FanSense, In-Circuit Serial hold harmless Microchip from any and all damages, claims, Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB suits, or expenses resulting from such use. No licenses are Certified logo, MPLIB, MPLINK, mTouch, PICkit, PICDEM, conveyed, implicitly or otherwise, under any Microchip PICDEM.net, PICtail, PIC32 logo, PowerCal, PowerInfo, intellectual property rights. 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. © 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 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 “Save project before build” dialog Underlined, italic text with A menu path File>Save right angle bracket Bold characters A dialog button Click OK A tab Click the Power tab N‘Rnnnn A number in verilog format, 4‘b0010, 2‘hF1 where N is the total number of digits, R is the radix and n is a digit. 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 Choice of mutually exclusive errorlevel {0|1} character: { | } arguments; an OR selection Ellipses... Replaces repeated text var_name [, var_name...] Represents code supplied by void main (void) user { ... } DS51793A-page 2 © 2009 Microchip Technology Inc.

Preface RECOMMENDED READING This user's guide describes how to use the MCP3421 SOT23-6 Evaluation Board with the PICkitSerial Analyzer. The following Microchip documents are available and rec- ommended as supplemental reference resources. PICkit™ Serial Analyzer User’s Guide, DS51647 Consult this document for instructions on how to use the PICkitSerial 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 V , SDA, and SCL test pads. The user DD 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 V , SCL, and SDA are provided to the board. This evaluation board DD 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: Front and Back Views of the MCP3421 SOT23-6 Evaluation Board. DS51793A-page 6 © 2009 Microchip Technology Inc.

Quick Start Instructions 1.3 GETTING STARTED WITH PICKIT SERIAL ANALYZER Figure1-1 shows the MCP3421 SOT23-6 Evaluation Board and Figure1-2 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 Figure1-2. 2. Connect the oscilloscope probes to SCL and SDA test pins (optional). 3. V selection: You can use the V from the PICkit Serial Analyzer or use your DD DD own external V . You can select the V path using the JP1 connector: DD DD (a) Connect JP1, if using V from PICkit Serial Analyzer, DD (b) Disconnect JP1 and apply V at V pin, if you are using external V . DD DD DD Note: If you are using external V , connect the external V at V pad). DD DD DD 4. Connect V , if external V is used. DD DD Note: Do not connect V if you are using V from the PICkit Serial Analyzer. DD DD The PICkit Serial Analyzer provides the V automatically if it is connected DD to PC. 5. LED D1 turns on when V is applied. DD Note: If the V is provided from the PICkit Serial Analyzer, then the LED may not DD be turned on until you execute a command. See Section1.3.2.1“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, V -) to V . IN SS 7. Use the PICkit Serial Analyzer PC GUI to send I2C write and read commands. See Section1.3.2.1“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 V is powered-up. DD © 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: MCP3421 SOT23-6 Evaluation Board with the PICkit Serial Analyzer. DS51793A-page 8 © 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: PICkit Serial Analyzer Configuration Wizard Welcome Window. 4. Select the I2C Master option as communication mode, and click the Next button. FIGURE 1-4: Step 1 - Communication Mode Selection. © 2009 Microchip Technology Inc. DS51793A-page 9

MCP3421 SOT23-6 Evaluation Board User’s Guide 5. Select 100kHz or 400kHz. Either one will be fine. Click the Next button. FIGURE 1-5: Step 2 - I2C Communication Speed Window. Note: The MCP3421 device supports the I2C bus data rate up to 3.4MHz, but the current version of the PICkit Serial Analyzer supports the I2C bus data rate up to 400kHz 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: Step 3 - Device Pullups Window. DS51793A-page 10 © 2009 Microchip Technology Inc.

Quick Start Instructions 7. Select the V voltage of the MCP3421 SOT23-6 Evaluation Board and click the DD Next button. Case 1: When you use V from the PICkit Serial Analyzer: DD 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 5VDC 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 V : DD You can also provide your own V voltage by applying a V voltage at the V DD DD DD test point on the board. In this case, make sure the JP1 jumper is disconnected. FIGURE 1-7: Step 4 - Voltage Source Selection Window. © 2009 Microchip Technology Inc. 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 configura- tion set-ups. You are now ready to program the MCP3421 SOT23-6 Evaluation Board using the PICkit Serial Analyzer. FIGURE 1-8: Configuration Wizard - Finishing Step. DS51793A-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 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: Creating a Script File with Script Builder. © 2009 Microchip Technology Inc. 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: Modifying Parameters in the Script Builder Window. DS51793A-page 14 © 2009 Microchip Technology Inc.

Quick Start Instructions 5. Change the parameter value. Script Detail I2CSTART * I2CWRTBYT * 02 ------> This means there are two bytes to send D0 ------> 1st Write Byte: Address byte with W/R bit = 1101-0000 9C ------> 2nd Write Byte: 1001-1100 I2CSTOP * Note: 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. © 2009 Microchip Technology Inc. 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: Script File Example for the I2C Write Command. DS51793A-page 16 © 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 Zoom-in Write Command with Address bits Configuration Bits FIGURE 1-12: 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 * 01 ------> This means there is one byte for address D1 ------> Address byte with W/R bit = 1101-0001 I2CRDBYTNLB * 5 ------> 5 bytes to read I2CSTOP * 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 MCP3421 in this evaluation board. See the MCP3421 Data Sheet for more information on address bit selection. DS51793A-page 18 © 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: 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. © 2009 Microchip Technology Inc. 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 15.625mV (LSB) = 1.0307V with PGA = 1 PGA Note: * 1 LSB with 18 bit resolution option: 15.625µV 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 Figure1-15 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 4th Byte 5th 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: BILL OF MATERIALS Qty Reference Description Manufacturer Part Number 1 C1 CAP .1UF 25V CERAMIC X7R Panasonic® - ECG ECJ-2VB1E104K 0805 1 C2 CAP CERAMIC 10UF 6.3V X5R Panasonic - ECG ECJ-2FB0J106K 0805 1 D1 LED RED ORANGE CLEAR 0805 LITE-ON INC LTST-C170EKT SMD 1 J1 CONN HEADER 6POS .100 R/A Molex/Waldom® Electronics 22-05-2061 TIN Corp 1 PCB RoHS Compliant Bare PCB, — 104-00124 MCP3421EV 2 R1,R3 RES 4.99K OHM 1/8W 1% 0805 Panasonic - ECG ERJ-6ENF4991V 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 Microchip Technology Inc. MCP3421A0T-E/OT with I2C Interface and On-Board Reference 7 VDD Vin+ Vin- TEST POINT PC COMPACT SMT Keystone Electronics® 5016 GND SCL SDA VDD 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. © 2009 Microchip Technology Inc. DS51793A-page 29

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