Microchip Technology MCP3421 SOT23-6 User Manual

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MCP3421 SOT23-6

Evaluation Board

User’s Guide

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MCUs and dsPIC® DSCs, KEELOQ

code hopping

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

MCP3421 SOT23-6 Evaluation Board User’s Guide

NOTES:

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 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 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 MC P34 21 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 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 Evaluatio n Boar d.

• Appendix B. “Bill Of Materials (BOM)” – lists the parts used to build the MCP3421 SOT23-6 Evaluation Board.

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

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)

{ ... }

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

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

MCP3421 SOT23-6 Evaluation Board User’s Guide

DOCUMENT REVISION HISTORY

Revision A (January 2009)

• Initial Release of this Document.

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 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 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 I 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 I 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.

, SDA, and SCL test pads. The user

C communication

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”.

, SCL, and SDA are provided to the board. This evaluation board

communications by connecting an oscilloscope to the

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.

MCP3421 SOT23-6 Evaluation Board User’s Guide

FIGURE 1-1: Front and Back Views of the MCP3421 SOT23-6 Evaluation Board.

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. V

selection: You can use the VDD from the PICkit Serial Analyzer or use your

own external V (a) Connect JP1, if using V (b) Disconnect JP1 and apply V

. You can select the VDD path using the JP1 connector:

from PICkit Serial Analyzer,

at VDD pin, if you are using external VDD.

Note: If you are using external V

4. Connect V

, if external VDD is used.

, connect the external VDD at VDD pad).

Note: Do not connect VDD if you are using VDD from the PICkit Serial Analyzer.

The PICkit Serial Analyzer provides the V

automatically if it is connected

to PC.

5. LED D1 turns on when V

is applied.

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

command.

6. Connecting analog inputs: If you need to measure single-ended input, connect

the unused pin (example, V

7. Use the PICkit Serial Analyzer PC GUI to send I

-) to VSS.

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 MCP3421 data sheet.

(b) Apply input signal after V

is powered-up.

MCP3421 SOT23-6 Evaluation Board User’s Guide

PICkit Serial Analyzer

MCP3421 Evaluation Board

USB Cable

Connected between the

and Personal Computer

PICkit Serial Analyzer

Personal Computer

Sensor Input

Connectors

FIGURE 1-2: MCP3421 SOT23-6 Evaluation Board with the PICkit Serial Analyzer.

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 I

FIGURE 1-4: Step 1 - Communication Mode Selection.

C Master option as communication mode, and click the Next button.

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: Step 2 - I2C Communication Speed Window.

Note: 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 I up to 400 kHz only.

6. Select No Note: The MCP3421 SOT23-6 Evaluation Board has its own pull-up resistors,

on Enable Pull-ups, and click the Next button.

therefore, you don’t need additional pull-up resistors from the PICkit Serial Analyzer.

C bus data rate

FIGURE 1-6: Step 3 - Device Pullups Window.

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:

Y ou 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 disconnecte d.

FIGURE 1-7: Step 4 - Voltage Source Selection Window.

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 no w read y to pr ogram the MCP3421 SOT23-6 Evaluation Board using the PICkit Serial Analyzer.

FIGURE 1-8: Configuration Wizard - Finishing Step.

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.

MCP3421 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: Choose the box and right

3. Make sure the listed

are in the exact order

parameters in “Script Detail” as shown here.

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 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.

C Scripts” column.

FIGURE 1-10: Modifying Parameters in the Script Builder Window.

Quick Start Instructions

I2CSTART I2CWRTBYT 02 D0 9C

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: 1001-1100

* *

5. Change the parameter value.

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.

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.

Quick Start Instructions

Write Command with Address bits

Configuration Bits

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 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 I

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.

C Write Command to the

FIGURE 1-12: I

C Write Command Waveforms for the MCP3421.

MCP3421 SOT23-6 Evaluation Board User’s Guide

I2CSTART I2CWRTBYT 01 D1 I2CRDBYTNLB

I2CSTOP

Script Detail

------> This means there is one byte for address

------> Address byte with W/R bit = 1101-0001

------> 5 bytes to read

* *

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 Det ail 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:

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.

Quick Start Instructions

Requesting

Address Byte

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

MCP3421 SOT23-6 Evaluation Board User’s Guide

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

Output code: 101AD in hex (= 65965 in decimal)

Output Voltage: 65865 x 15.625 mV (LSB) = 1.0307 V with PGA = 1

Results:

(note that RDY bit returned to “1” after 4th byte)

Note:

* 1 LSB with 18 bit resolution option: 15.625 µV

Reading Conversion

Data

Requesting

5 Bytes

PGA

FIGURE 1-14: Reading Conversion Results: Note that the single ended Inp ut = 1.0307V is applied at Ch.1. The reading indicates the measured value is 1.0307V. See Figure 1-15 for waveforms.

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.

4th Byte

5th Byte

RDY bit

Quick Start Instructions

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 . Af ter the RDY RDY

bit becomes “1” in the 5th byte (repeated byte). This means the device is now in the process of a new

bit is read out at the 4th byte, the

conversion and the latest conversion result is not ready yet.

MCP3421 SOT23-6 Evaluation Board User’s Guide

NOTES:

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

MCP3421 SOT23-6 EVALUATION

BOARD USER ’S GUIDE

MCP3421 SOT23-6 Evaluation Board User’s Guide

A.2 BOARD – SCHEMATIC

A.3 BOARD – TOP LAYER

Schematic and Layouts

MCP3421 SOT23-6 Evaluation Board User’s Guide

A.4 BOARD – TOP METAL LAYER

A.5 BOARD – BOTTOM METAL LAYER

Schematic and Layouts

MCP3421 SOT23-6 Evaluation Board User’s Guide

NOTES:

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

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

TIN

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 7 VDD Vin+ Vin-

GND SCL SDA VDD

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 LTST-C170EKT

Molex/Waldom Corp

— 104-00124

Panasonic - ECG ERJ-6ENF4991V

Microchip Technology Inc. MCP3421A0T-E/OT

Electronics

22-05-2061

5016

WORLDWIDE SALES AND SERVICE

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ASIA/PACIFIC

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Thailand - Bangkok

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EUROPE

Austria - Wels

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UK - Wokingham

Tel: 44-118-921-5869 Fax: 44-118-921-5820

01/16/09

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Microchip: MCP3421EV

Microchip Technology MCP3421 SOT23-6 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

INTRODUCTION

DOCUMENT LAYOUT

CONVENTIONS USED IN THIS GUIDE

RECOMMENDED READING

THE MICROCHIP WEB SITE

CUSTOMER SUPPORT

DOCUMENT REVISION HISTORY

Chapter 1. Quick Start Instructions

1.1 INTRODUCTION

1.2 DESCRIPTION OF THE MCP3421 SOT23-6 EVALUATION BOARD

1.3 GETTING STARTED WITH PICKIT SERIAL ANALYZER

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

A.2 BOARD – SCHEMATIC

A.3 BOARD – TOP LAYER

A.4 BOARD – TOP METAL LAYER

A.5 BOARD – BOTTOM METAL LAYER

Appendix B. Bill Of Materials (BOM)

WORLDWIDE SALES AND SERVICE