Microchip Technology MCP3422 Evaluation Board for PICkit Serial User guide

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MCP3422

Evaluation Board

for PICkit™ Serial

User’s Guide

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Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and T empe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC devices, Serial EEPROMs, microperipherals, nonvolatile memo ry and analog products. In addition, Microchip’s quality system for the desig n and manufacture of development systems is ISO 9001:2000 certified.

MCUs and dsPIC® DSCs, KEELOQ

code hopping

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

MCP3422 Evaluation Board for PICkit™ Serial User’s Guide

NOTES:

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 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 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 Evalu a tio n Boa rd as a development tool to emulate and debug firmware on a t arget board. The manual layout is as follows:

• Chapter 1. “Quick Start Instructions” – this chapter provide s an overview of the MCP3422 Evaluation Board and instruct ions on how to use theMCP3422 Evaluation Board with PICkit

• 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.

Serial Analyzer.

MCP3422 Evaluation Board for PICkit™ Serial 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

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

DOCUMENT REVISION HISTORY

Revision A (November 2008)

• Initial Release of this Document.

MCP3422 Evaluation Board for PICkit™ Serial User’s Guide

NOTES:

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 inpu t connection pads and V 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.

, SDA, and SCL test pads. The user can connect inputs an d

Note: The MCP3422 Evaluation Board can be used without the PICkit Serial

Analyzer as long as the V MCP3422 Evaluation Board does not include MCU.

The user can monitor the I SDA and SCL test pads. Refer to Appendix A. “Schematic and Layouts”.

communications by connecting an oscilloscope to the

, SCL, and SDA are provided to the board. The

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 Boar d uses default setting: (A2, A1, A0) = (0, 0, 0)

• Address Byte = 1101000R/W

MCP3422 Evaluation Board for PICkit™ Serial User’s Guide

FIGURE 1-1: Front View of the MCP3422 Evaluation Board.

1.3 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. V

4. Connecting V

5. Connecting the analog inputs: If you need to measure a single-ended input,

• Connecting the inputs: The MCP3422 Evaluation Board has input pads for

Selection: You can use the VDD from the PICkit Serial Analyzer or you can

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

: LED D1 turns on when VDD is applied. The PICkit Serial

Analyzer will provide V

. The JP1 connector selects the VDD path.

from PICkit Serial Analyzer.

at VDD1 pin, if you are using an external 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.

connect the unused pin (example, CHX-) to V

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.

Quick Start Instructions

PICkit Serial Analyzer

MCP3422 Evaluation Board

USB Cable

Connected between the

and Personal Computer

PICkit Serial analyzer

Personal Computer

Sensor Input

Connectors

Sensor Input

Connectors

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 V

is powered-up.

FIGURE 1-2: MCP3422 Evaluation Board with the PICkit Serial Analyzer.

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.

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: Step 2 - I

Note: 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 I up to 400 kHz only.

C Communication Speed Window.

C bus data rate

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 V button.

voltage of the MCP3422 Evaluation Board and click the Next

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:

Y ou 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.

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 Evalua tion Board using the PICkit Serial Analyzer.

FIGURE 1-8: Configuration Wizard - Finishing Step.

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 Seria l Analyzer and the MCP3422 Evaluation Board, a script file is needed. The followin g 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 I 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.

C Scripts” column.

Quick Start Instructions

1. To change value:

• Click this box and type a new number.

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” should be in exact order as shown here.

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 (Configuration Byte): 1001-1100

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

4. Change the parameter value.

Note: All 6 parameters above must be listed in the same order as shown here.

The parameters above with * are not modifiable.

MCP3422 Evaluation Board for PICkit™ Serial User’s Guide

2 Bytes to send

Address Byte

Configuration Byte

(9C)

Note: 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

FIGURE 1-11: Script File Example for the I2C Write Command.

Quick Start Instructions

REDUE THIS PLOT WITY CORRECT

Write Command with Address bits

Configuration Bits

Zoom-in

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 I

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.

C Write Command to the

FIGURE 1-12: I2C Write Command Waveforms for the MCP3422.

MCP3422 Evaluation Board for PICkit™ Serial 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

* *

Requesting

Address Byte

5 Bytes

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 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:

Note: All 7 parameters above must be listed in order. The parameters above with

* are not modifiable.

FIGURE 1-13: Script File Sample to Read Conversion Data.

Quick Start Instructions

3. Type in any scr ipt 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 I

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: 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.

C Read Command to the

MCP3422 Evaluation Board for PICkit™ Serial User’s Guide

Requesting

5 Bytes

Reading Data

using a Read Command

Address Byte

Results:

Output code: F907 in hex ( = 63751 in decimal) Output Voltage=

63751

15.625 μVLSB() PGA

--------------------------------------------

× 0.996 Volts with PGA 1==

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.

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

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.

Quick Start Instructions

Zoom-in

Data Bytes = 00F907 (hex)

Zoom-in

Configuration Byte (4th) and Repeated Configuration Byte (5th)

(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

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 (repeated byte). This means the device is now in the process of new conversion and the new result is not ready yet.

bit becomes “1” in the 5th byte

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 Dat a 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.

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

MCP3422 EVALUATION BOARD FOR

PICkit™ SERIAL USER’S GUIDE

MCP3422 Evaluation Board for PICkit™ Serial User’s Guide

A.2 BOARD SCHEMATIC

A.3 BOARD – TOP LAYER

Schematic and Layouts

MCP3422 Evaluation Board for PICkit™ Serial User’s Guide

A.4 BOARD – TOP METAL LAYER

A.5 BOARD – BOTTOM LAYER

Schematic and Layouts

MCP3422 Evaluation Board for PICkit™ Serial User’s Guide

NOTES:

MCP3422 EVALUATION BOARD FOR

PICkit™ SERIAL 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 JP1 CONN HEADER 2POS .100 VERT

TIN 1 JP1 Shunt .100" Shorting Block with Handle JAMECO VALUEPRO 2012JH-R 1 PCB RoHS Compliant Bare PCB,

MCP3422 Eval Board for PICKit

Serial 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 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.

Panasonic® - ECG ECJ-2VB1E104K

Panasonic - ECG ECJ-2FB0J106K

LITE-ON INC LTST-C170EKT

Molex®/Waldom® Electronics Corp

Molex/Waldom Electronics Corp

— 104-00228

Microchip Technology Inc. ERJ-6ENF4991V

22-05-2061

22-03-2021

WORLDWIDE SALES AND SERVICE

AMERICAS

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01/02/08

Microchip Technology MCP3422 Evaluation Board for PICkit Serial User guide

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 MCP3422 EVALUATION BOARD

1.3 GETTING STARTED WITH THE 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 LAYER

Appendix B. Bill Of Materials (BOM)

WORLDWIDE SALES AND SERVICE