Microchip Technology MCP42XX, MCP42XX PICtail Plus User Manual

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MCP42XX

PICtail™ Plus

Daughter Board

User’s Guide

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in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates.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 IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and 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

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EELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,

PICSTAR T, rfPIC and SmartShunt are registered trademarks of Microchip T echnology Incorporated in the U.S.A. and other countries.

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Analog-for-the-Digital Age, Application Maestro, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN, ECONOMONITOR, FanSense, In-Circuit Serial Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB, MPLINK, mTouch, PICkit, PICDEM, PICDEM.net, PICtail, PIC

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All other trademarks mentioned herein are property of their respective companies.

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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

MCP42XX PICTAIL™ PLUS

DAUGHTER 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...................................................................................3

Chapter 1. Product Overview

1.1 Introduction .....................................................................................................5

1.2 What is the MCP42XX PICtail Plus Daughter Board? ....................................6

1.3 What the MCP42XX PICtail Plus Daughter Board Kit includes ...................... 7

Chapter 2. Installation and Operation

2.1 Introduction .....................................................................................................9

2.2 Features .........................................................................................................9

2.3 Getting Started .............................................................................................10

2.4 Explorer 16 Daughter Demo Board Demos ..................................................14

Appendix A. Schematic and Layouts

A.1 Introduction ..................................................................................................29

A.2 Schematics and PCB Layout ....................................................................... 29

A.3 Board - Schematic .......................................................................................30

A.4 Board – Top Silk-screen Layer ....................................................................31

A.5 Board – Top Components + Silk-Screen .....................................................32

A.6 Board – Ground Layer .................................................................................33

A.7 Board – Power Layer ................................................................................... 34

A.8 Board – Bottom Layer .................................................................................. 35

Appendix B. Bill Of Materials (BOM) Appendix C. Board Testing

C.1 Introduction ..................................................................................................39

C.2 What is Tested .............................................................................................40

C.3 What is NOT Tested .................................................................................... 40

Worldwide Sales and Service ....................................................................................42

MCP42XX PICtail™ Plus Daughter Board User’s Guide

NOTES:

MCP42XX PICTAIL™ PLUS

DAUGHTER 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 MCP42XX PICtail Plus Daughter Board User’s Guide. 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 MCP42XX PICtail Plus Daughter Boar d User’s Guide as a development tool to emulate and debug firmware on a ta rget board. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MCP42XX PICtail Plus Daughter Board User’s Guide.

• Chapter 2. “Installation and Operation” – Includes instructions on how to get started with this user’s guide and a description of the user’s guide.

• Appendix A. “Schematic and Layouts” – Shows the schematic and layout diagrams for the MCP42XX PICtail Plus Daughter Board User’s Guide.

• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the MCP42XX PICtail Plus Daughter Board User’s Guide.

• Appendix C. “Board Testing” – Describes the testing method for the MCP42XX PICtail Plus Daughter Board User’s Guide and what aspects of the board are and are not tested.

MCP42XX PICtail™ Plus Daughter 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

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 (September 2008)

• Initial Release of this Document.

MCP42XX PICtail™ Plus Daughter Board User’s Guide

NOTES:

Chapter 1. Product Overview

1.1 INTRODUCTION

The MCP42XX PICtail Plus Daughter Board demonstrates the features and abilities of Microchip’s MCP41XX and MCP42XX Digital Potentiometers. This board is designed to exclusively use the MCP42XX devices.

The MCP41XX and MCP42XX are Digital Potentiometers with an SPI interface. These devices have either 7-bits or 8-bits of resolution, single or dual offering, and are available as either volatile or non-volatile memory options.

This board is designed to easily operate with any of the following:

• PIC24 Explorer 16 Demo Board (DM240001)

• PICkit™ Serial Analyzer (DV164122)

• Other PICDEM Demo Board that includes a PICtail Plus female connector

The use of the PIC24 Explorer 16 Demo Board (DM240001) will require a tool to program the supplied firmware into the PIC24FJ128GA010 device. The use of any other PICDEM Demo Board will require the user to modify the supplied “C” source program appropriately.

The use of the PICkit Serial Analyzer will require the PC GUI interface program to control the command and data sent to the MCP42XX devices serial port. The PICkit Serial Analyzer GUI may be used, or the provided dedicated GUI may be used. The source code for this dedicated GUI is available, but not supported (as is).

This chapter covers the following topics:

• What is the MCP42XX PICtail Plus Daughter Board?

• What the MCP42XX PICtail Plus Daughter Board Kit includes

MCP42XX PICTAIL™ PLUS

DAUGHTER BOARD USER’S GUIDE

MCP42XX PICtail™ Plus Daughter Board User’s Guide

PICkit Serial Analyzer Interface (SPI)

Not Installed

Connects Wipers (W0 and W1) to PIC24 Analog Inputs

Connects Explorer 16 +5V signal to AVDD signal

Selects source of Terminal A0 Voltage. Either AVDD or VA0

Selects source of Terminal B0 Voltage. Either A VSS or VB0

Selects source of Terminal A1 Voltage. Either AVDD or VA1

Selects source of Terminal B1 Voltage. Either AVSS or VB1

1.2 WHAT IS THE MCP42XX PICTAIL PLUS DAUGHTER BOARD?

The MCP42XX PICtail Plus Daughter Board is used to demonstrate the use of Digital Potentiometers. This board is designed to be used in conjunctio n with either the PIC24 Explorer 16 Demo Board or the PICkit™ Serial Anal yzer . Figu re 1-1 shows the boards component placement and the purpose of the jumpers.

The board has an MCP4261-103 (10 kΩ) device for evaluation. This device is in the TSSOP package (U2). This is a dual 8-bit Non-Volatile Potentiometer device. The MCP4261 uses an SPI interface and can be controlled via the PICkit Serial Analyzer interface (J1) or via the PICtail Plus interface (J3).

When using the PICtail Plus interface, the CS high voltage commands. This is done by controlling the selection of the analog switch device (U1).

Jumpers allow the Terminal A and T erminal B voltages to be tied to AVDD and VSS, or come from and external source.

voltages can be ta ken to a V

level for

IHH

FIGURE 1-1: MCP42XX Explorer 16 Daughter Board Demo Boar d Connectors.

Product Overview

Some of the features of the board include:

• PICkit Serial Analyzer Interface (J1)

• PICtail Plus Interface (J3)

• MAX4582L High Voltage analog switch to allow CS of four voltages (V

• Jumpers (JP2:JP3) to connect Wiper pins (W0 and W1) to PICDEM Analog Channels

• Jumper (JP1) to allow AVDD to be driven by external power supply while connected to PICDEM board or PICkit Serial Analyzer

• Jumpers to allow Terminal A pins to be connected to AV

• Jumpers to allow Terminal B pins to be connected to V

• Connection point for easy connection to Resistor Network Terminal pins

, 3.3V, 5.0V, or 9.0V) - High Voltage command support

1.3 WHAT THE MCP42XX PICTAIL PLUS DAUGHTER BOARD KIT INCLUDES

This MCP42XX PICtail Plus Daughter Board Kit includes:

• One MCP42XX PICtail Plus Daughter Board, 102-00182

• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)

- MCP42XX PICtail™ Plus Daughter Board User’s Guide, (DS51759)

- PICkit Serial Analyzer PC GUI (executable and source code) - supplied “As

Is”

voltage to be selected as one

or VAx pad

or VBx pad

MCP42XX PICtail™ Plus Daughter Board User’s Guide

NOTES:

Chapter 2. Installation and Operation

2.1 INTRODUCTION

The MCP42XX PICtail Plus Daughter Board is used to demonstrate the operation of Digital Potentiometer. The operation of the MCP41XX devices is similar to the MCP42XX devices. Therefore, this demo board can be used as a development platform for either device family.

This board is designed to be used in conjunction with either the PIC24 Explorer 16 Demo Board or the PICkit™ Serial Analyzer.

2.2 FEATURES

This board supports the following features

• Each digital potentiometers Terminal A pin can be individually connected to either AV

• Each digital potentiometers Terminal B pin can be individually connected to either AV

• Can control the voltage on the MCP4261’s CS pin to either V

9.0V via control signals from the PICtail Plus interface (J3)

• Can Control the MCP4261 via the PICkit™ Serial Analyzer interface (J1)

• PIC24 can monitor the voltage levels of the MCP4261’s W0 and W1 pins

• Supplied with a “C” program that demonstrates normal and high voltage commands

• Demonstrates a split rail application, with digital logic at 3.3V and analog operation at 5.0V

MCP42XX PICTAIL™ PLUS

DAUGHTER BOARD USER’S GUIDE

or the corresponding VAx pad

or the corresponding VBx pad

, 3.3V, 5.0V, or

MCP42XX PICtail™ Plus Daughter Board User’s Guide

PICVDD

AB0

AB1

CS0

SDI

SDO

JP3

VA1

Pin # SPI Name I2C Name

1 2 3 4 5 6 7 8 9

11 12 13 14

CS SCK SDI VSS P1B P1W P1A P0A P0W P0B WP SHDN SDO VDD

HVC/A0 SCL SDA VSS P1B P1W P1A P0A P0W P0B WP A2 A1 VDD

Pin # SPI Name I2C Name

6 5 4 3 2 1

SDO SCK SDI VSS VDD CS

— SCL SDA VSS VDD —

PICkit Serial 6-Pin Interface

VSS

AVDD

VSS

SCK

SHDN

RB2 (CS0)

SDI

SDO

RF0 (WP

)

RF1 (SHDN

)

JP4

VB1

VW1

JP1

VA0

AVDD

JP2

VB0

VW0

H1 (PICkit Serial Interface)

CS V

VSS SDI2 SCK2 SDO2

PIC Explorer 16 Interface

MCP4261

(TSSOP)

SCK

RB0/AN0 RB1/AN1

VW0

VW1

SDA2

RF2

RF3 SCL1 SDA1 V

AN1 RB4/AN4

RE8 RD15 +3.3V +5.0V +9.0V RF0 RF1 RF4 RF5 SCL2 SDA2

RB2

SCK1

SDI1

SDO1

AN0

RB3/AN3

RE9 RD14 +3.3V +5.0V +9.0V

RG0 RG1 RG9

SCK2

SDI2

SDO2

Connector Orientation Notch

+5.0V +3.3V

+9.0V

Y1 Y2

CS0

A B

RD15

RD14

+9.0V

VSS

RB2

VSS

(+5.0V)

MAX4582L

H2 (PICkit Serial Interface)

NC V

VSS SDA SCL NC

SCL2

(To SDI)

(To SDO) (To SCK)

2.3 GETTING STARTED

Figure 2-1 shows a simplified circuit for the MCP42XX PICtail Plus Daughter Board. The layout of the board is shown in Figure 2-3. This board can be operated with ei ther a PICDEM board with a PICtail Plus header or the PICkit Serial Analyzer. The MCP42XX PICtail Plus Daughter Board kit comes with firmware for the Explorer 16 Star ter Kit (DV164033). The layout of this board is shown in Figure 2-5.

The MCP42XX PICtail Plus Daughter Board supports the following Microchip Digital Potentiometer devices; which allows demonstration of all MCP42XX devices

•MCP42X1

FIGURE 2-1: MCP41XX Simplified Circuit.

Installation and Operation

2.3.1 The Hardware

Figure 2-2 shows the component placement of the MCP42XX PICtail Plus Daughter Board as well as the operation of the board jumpers.

The VAx and VBx pads allow an external voltage source to be applied to the device’s desired Terminal A or Terminal B pin. The VWx pad is directly connected to the corresponding Terminal W pin, which makes it easy to measure the resulting voltage. The A VDD p ad allows an external power supply to power the boa rd, which should impr ove performance compared to powering the boar d via the PICtail Plus header or the PICkit Serial Analyzer.

The Printed Circuit Board (PCB) has been designed for the support of the SPI and I device families (MCP42XX and MCP46XX), so not all components are installed for the SPI version of the demo board.

2.3.1.1 JUMPER DESCRIPTIONS Figure 2-2 shows the function of the demo board jumpers. Some of the jumpers con-

figure the voltage source of the Terminal A and Terminal B pins while others determine the connection of the W pins. Lastly there is a jumper to ensure that drive conflict s do not occur if an external power supply is being used for the AVDD voltage.

The default jumper configuration for the shipped demo board is shown in Figure 2-3.

MCP42XX PICtail™ Plus Daughter Board User’s Guide

JMP1:JMP3 -

VAx Pad AVDD

Terminal A Source

JMP2:JMP4 -

VBx Pad VSS

Terminal B Source

AN1 connected to W1

JP3 - PIC24 AN1 pin

AN1 not connected

AN0 connected to W0

JP2 - PIC24 AN0 pin

AN0 not connected

Explorer 16 5V signal connected to

JP1 - Explorer 16 5V signal to AVDD plane

Explorer 16 5V signal not connected to

MCP42XXDM-PTPLS AVDD plane

MCP42XXDM-PTPLS AV

plane

FIGURE 2-2: MCP42XXDM-PTPLS Jumper Configuration and Oscilloscope Test Points.

Installation and Operation

FIGURE 2-3: MCP42XX PICtail Plus Daughter Board Layout with Default Jumper Settings

Note: This is the Jumper configuration that the board should be shipped with.

MCP42XX PICtail™ Plus Daughter Board User’s Guide

2.4 EXPLORER 16 DAUGHTER DEMO BOARD DEMOS

This section describes how to demonstrate the MCP42XX PICtail Plus Daughter Board. The demos will either use an Explorer 16 Developers Board or a PICkit Serial Analyzer.

The demo using the Explorer 16 Developers Board is discussed in Section 2.4.1 “Demos with the Explorer 16 Starter Kit”. While the demo using the PICkit Serial Analyzer is discussed in Section 2.4.2 “Demo with the PICkit Serial

Analyzer”.

Note: Both demos require that the MCP42XXDM-PTPLS board jumper settings

are as shown in Figure 2-4.

2.4.1 Demos with the Explorer 16 Starter Kit

Note: For information on how to use the MPLAB-IDE, ICD-2, or any other aspect

of the PIC Development tool platform, please refer to the appropriate documentation.

This Demo will use the Explorer 16 Starter Kit. This board needs to be programmed with the supplied firmware. This firmware can be found on the included CD-ROM or can be downloaded from the Microchip web site. It is good pr actice to check the Micr ochip web site for updates to the demo firmware.

The supplied firmware program has two modes of operation. In the first mode, the program generates a saw wave on the VW1 pin (see Figure 2-6). The second mode is to display the operation of High V oltage comma nds to Wiper 1 (see Figure 2-7). This is where the CS

The program selected is determined after a re set (including the Power-on reset) by the state of the S3 switch. The programs are:

• Wiper 1 Saw Wave (Switch S3 not depressed)

• Increment / Decrement with High Voltage Write to Non-Volatile Wiper 1 Register (Switch S3 depressed)

Table 2-1 shows the required hardware to operate the demo.

signal is driven to 9V.

TABLE 2-1: DEMO HARDWARE REQUIREMENTS

Item # Description Comment

1 Explorer 16 Developers Board and power supply

(DV164033)

2 MCP42XXDM-PTPLS 3 4 Channel oscilloscope Note 2 Note 1: A development tool to program the Explorer 16 Developers Board is required. This

development tool could be Microchip’s MPLAB ICD-2.

2: An oscilloscope with fewer channels can be used, but this will require that the

probes be moved between signals to verify the output states. A 2 channel is the minimum requirement, but is not recommended.

Note 1

Installation and Operation

Channel 4

Channel 1

Channel 2

Channel 3

Channel 4 (Program 2 SDO Signal)

2.4.1.1 THE MCP42XXDM-PTPS JUMPER CONFIGURATION Before inserting the board into the Explorer 16 Developers Board, the jumper

configuration must be verified. Figure 2-4 shows the configurations of the jumpers.

FIGURE 2-4: MCP4XXDM-PTPLS Jumper Configuration and Oscilloscope Test Points.

Note: This is the Jumper configuration that the board should be shipped with.

MCP42XX PICtail™ Plus Daughter Board User’s Guide

Explorer 16 Development Board reset switch

Connector (female) for MCP42XXDMPTPLS board

S3 (RD6) S6 (RD7)

S5 (RA7)

S4 (RD13)

Switch State Increment Volatile Wiper1

Read Volatile Wiper1, then

Decrement Volatile Wiper1

Write Non-Volatile Wiper1

selects program at POR or after MCLR reset

2.4.1.2 MCP42XX PICTAIL PLUS DAUGHTER BOARD (MCP42XXDM-PTPLS)

INTO THE EXPLORER 16 STARTER KIT (DV164033)

Figure 2-5 shows the component placement on the Explorer 16 Demo Board including the PICtail Plus header that the MCP42XX PICtail Plus Daughter Bo ard is inserted into. The boards Reset switch and other switches are pointed out.

Ensure that the MCP42XXDM-PTPLS is installed in the correct orientation into the Explorer 16 Developers Board. Figure 2-5 shows the location where the daughter board is inserted into the Explorer 16 Developers Board.

FIGURE 2-5: Explorer 16 Development Board (DV164033).

Installation and Operation

2.4.1.3 DEMO STEPS The PIC24 Board firmware contains two programs. The program selected is deter-

mined after a reset (including the Power-on reset) by the state of the S3 switch. The programs are:

1. Wiper 1 Saw Wave (Switch S3 not depressed).

2. Increment / Decrement with High V olt age W rite to Non-Volatile Wiper 1 Register (Switch S3 depressed).

Table 2-2 shows the sequence of steps to demo the MCP42XXDM-PTPLS board with the Explorer 16 Developer’s Board.

Figure 2-6 shows the expected output waveform for Program #1 (Wiper 1 Saw Wave) as well as the voltage levels and ranges of the four signals. Figure 2-7 shows an example waveforms for the High Voltage Write Command for the SDI, SDO, SCK, and CS signals.

TABLE 2-2: DEMO STEPS USING THE PICDEM HPC EXPLORER DEMO

BOARD

Step Action Result

1a Turn on oscilloscope and configure as follows:

• Channel 1, 2, 3, and 4 @ 5V/Division

• Channel 1 to 4 have same ground reference point

1b Configure oscilloscope as follows:

• Time-base = 100 ms/Division (see

Figure 2-6 for scope details)

2 Configure the MCP42XXDM-PTPLS to the

jumper settings shown in

3 Insert the MCP42XXDM-PTPLS board into the

Explorer 16 Developers Board J5 header (see

Figure 2-4.

Figure 2-5). Ensure proper orientation of

Daughter Board to J5 Header.

4 Connect the oscilloscope probes as follows:

• Channel 1 to the CS

• Channel 2 to the SDI Pin of Header J1

• Channel 3 to the SCK Pin of Header J1

• Channel 4 to the VW1 Pad

5 Power up the programmed Explorer 16 Devel-

oper Board and depress and release the MCLR push button

6 Depress the Explorer 16 Developer Board’s S3

push button

7 Depress and release the Explorer 16 Developer

Board’s MCLR push button

8 Release the Explorer 16 Developer Board’s S3

push button

9 Configure oscilloscope as follows:

• Time-base = 50 µs/Division (see

Figure 2-7 for scope details)

Note 1: The SDI and SCK signals go from V

operating at 3.3V. The VW1 signals go from V

Pin of Header J1

—

Program 1 is now selected. Output waveform should look similar

Figure 2-6. Ensure to verify volt-

to age levels/ranges of the four signals.

(Note 1)

—

Program 2 is now selected.

—

to approximately 3.3V due to the PIC24

to approximately 5V.

MCP42XX PICtail™ Plus Daughter Board User’s Guide

TABLE 2-2: DEMO STEPS USING THE PICDEM HPC EXPLORER DEMO

BOARD (CONTINUED)

Step Action Result

10 Depress the Explorer 16 Developer Board’s S6

push button

1 1 Depress the Explorer 16 Developer Board’s S4

push button

12 Use the S4 and S6 push buttons to configure

the volatile wiper 1 register to either near VDD or near VSS. Take note of Wiper Voltage value.

13 Move Channel 4 scope probe (VW1) to SDO

signal on J1 (see Figure 2-4)

14 Configure Scope to Capture on Channel 1 (CS

pin) on the rising edge at about 7V.

15 Depress the Explorer 16 Developer Board’s S5

push button

16 Unplug Power from the Explorer 16 Developer

Board

17 Depress the Explorer 16 Developer Board’s S3

push button

18 Power up the programmed Explorer 16 Devel-

oper Board and depress and release the MCLR push button

19 Release the Explorer 16 Developer Board’s S3

push button

20 Unplug Power from the Explorer 16 Developer

Board and remove the MCP42XXDM-PTPLS board

Note 1: The SDI and SCK signals go from V

operating at 3.3V. The VW1 signals go from V

While S6 is depressed, the voltage on Wiper 1 (VW1) increases

While S4 is depressed, the voltage on Wiper 1 (VW1) decreases

—

While S5 is depressed, the volatile Wiper 1 register is read, this value is written to the Non-Volatile Wiper 1 register, and then approximately a 10ms delay occurs while the NV write cycle occurs. Capture will look similar

Figure 2-7 (Note 1)

to —

—

The voltage on the Wiper 1 pad (VW1) should be the same voltage level as when completed with Step

12. —

to approximately 3.3V due to the PIC24

to approximately 5V.

Installation and Operation

FIGURE 2-6: Screen Capture of Program 1 Output Waveforms.

FIGURE 2-7: Screen Capture of Program 2 Non-Volatile Write Waveform.

MCP42XX PICtail™ Plus Daughter Board User’s Guide

2.4.2 Demo with the PICkit Serial Analyzer

Note: For information on how to use the PICkit Serial Analyzer, or any other

aspect of the PIC appropriate documentation.

This demo requires that you have previously installed the PICkit Serial Analyzer (DV164122) on your computer. Ensure that the device has properly been installed before using the Supplied GUI for the MCP41XX/42XX devices.

Note 1: The GUI is supplied “As Is”, and the source code is supplied to allow

developers a starting point for any GUI development.

2: The GUI will be updated to include the selection of I

(MCP45XX/46XX).

The GUI requires two files, these are:

• DigipotControl.exe

• PICkitS.dll The “PICkitS.dll” file must be in the same directory as the application executable file. Table 2-3 shows the required hardware to operate the demo.

Development tool platform, please refer to the

C devices

TABLE 2-3: DEMO HARDWARE REQUIREMENTS

Item # Description Comment

1 PC with USB port running Windows XP 2 PICkit Serial Analyzer Adapter (DV164122) 3 MCP42XXDM-PTPLS 4 Oscilloscope Note 1 Note 1: A Digital Multi-Meter (DMM) may be used to measure the W pins voltage.

Installation and Operation

2.4.2.1 THE GUI SCREENS AND GUI CONFIGURATION Figure 2-8 shows the GUI when the application is first started.

FIGURE 2-8: 1st Screen of GUI.

Figure 2-9 sho ws th e GUI box where the SPI Baud Rate is specified. Clicking on the “Set Baud” button results in an actual Bau d Rate of 9.62 kHz, as shown in Figure 2-10. This reflects the actual Baud Rate based on the PICkit Serial Analyzer’s clock frequency.

FIGURE 2-9: Configuring the Baud Rate - Desired Baud Rate.

MCP42XX PICtail™ Plus Daughter Board User’s Guide

FIGURE 2-10: Con figuring the Baud Rate - Actual Baud Rate.

T o display the dat a values in hexidecimal, click on the Hex radial button. To Chip Select the MCP42XX device, click on the “Disable CS” button. The GUI window will now look like Figure 2-11. To have access to more control of the MCP42XX memory , click on the Advanced tab, and the GUI will display Figure 2-12.

FIGURE 2-11: Enabling The MCP42XX Chip Select.

Installation and Operation

FIGURE 2-12: Advance Screen.

Clicking on the Read Button should display the register values shown in Figure 2-13. The volatile wiper value should match the Non-volatile wiper value.

Note: The Volatile/Non-Volatile wiper values may not be the device’s expected

Mid-scale value due to board production testing.

T o write to a desired register, in the desired data entry box and click on the Write bu tton. Figure 2-14 shows an example of writing to the Volatile Wiper 0 register.

FIGURE 2-13: Advance Screen - Read Register.

MCP42XX PICtail™ Plus Daughter Board User’s Guide

FIGURE 2-14: Advan ce Screen - Write Register.

Installation and Operation

Channel 1

Insert PICkit Serial Analyzer into this Header

Figure 2-15 shows the connections for the Demo using the PICkit Serial Analyzer.

FIGURE 2-15: PICkit Serial Analyzer Demo Jumper Configuration and Oscilloscope Test Points.

MCP42XX PICtail™ Plus Daughter Board User’s Guide

2.4.2.2 DEMO STEPS The use of the PICkit Serial Analyzer means that wiper pin’s voltage is under direct

control from the PC’s GUI interface and more user experimentation is possible.

TABLE 2-4: DEMO STEPS USING THE PICDEM HPC EXPLORER DEMO

BOARD

Step Action Result

1a Turn on oscilloscope and configure as follows:

• Channel 1 @ 1V/Division (Note 1)

1b Configure oscilloscope as follows:

• Time-base = 100 µs/Division (Note 1)

2 Configure the MCP42XXDM-PTPLS to the

jumper settings shown in Figure 2-15.

3 Insert the PICkit Serial Analyzer into the

MCP42XXDM-PTPLS board’s J1 header. Ensure proper orientation of the PICkit Serial Analyzer to the J1 Header.

4 Connect the oscilloscope probes as follows:

• Channel 1 to the VW1 Pad 5 Plug the PICkit Serial into the PC’s USB port — 6 Plug the PICkit Serial into the

MCP42XXDM-PTPLS board’s J1 connector

7 Start the GUI application See Figure 2-8 and 8 Select a Baud rate of 9600 See Figure 2-9 and Figure 2-10 9 Under Additional Features, select the “Hex”

radial button and then Click on the “Enable CS” button. This drives the CS signal low. This Enables the MCP42XX to receive serial commands.

10 Click on the “Advanced” tab The Advanced screen appears, see

11 Click on all 6 “Read” buttons See Figure 2-13 12 In the Volatile Wiper 1 register text box, type a

value that is significantly different then the current value. Such as, if the value was 1FFh, type 20h.

Click on the associated “Write” button The VW1 voltage (on the oscillo-

Type other values and then click on the “Write”

button to see how the VW1 voltage changes

In the Wiper 1 text box, type 080h (mid-scale) The VW1 pin should go to AVDD / 2

Note 1: A Digital Multi-Meter (DMM) configured to measure voltage may be used instead of

an oscill0scope.

—

The MCP42XXDM-PTPLS board is now powered

See Figure 2-11. The button’s text changes to “Disable CS”

Figure 2-12

See Figure 2-14

scope) changes. Look on the oscilloscope to monitor

the Wiper 1 voltage after each click of the “Write” button.

Installation and Operation

TCON = Result ‘x 1110 xxxx’b B1 open,

W1 pulled high

‘x 1011 xxxx’b A1 open,

W1 pulled low ‘x 1101 xxxx’b W1 floating ‘x 0111 xxxx’b A1 open,

W1 connected to

B1 (Zero-Scale) ‘x 1111 xxxx’b All terminals con-

nected to their

respective pin

TABLE 2-4: DEMO STEPS USING THE PICDEM HPC EXPLORER DEMO

BOARD (CONTINUED)

Step Action Result

16 Now write values to the TCON register (bit 7 to

bit 4) and monitor the effects on the VW1 pin.

17 Write assorted values to the devices memory

locations and then read the values to see what is present. If the write is to Non-Volatile memory, power down (unplug) the MCP42XX PICtail Plus Daughter Board and then power up to evaluate if the non-volatile memory value is retained.

Note 1: A Digital Multi-Meter (DMM) configured to measure voltage may be used instead of

an oscill0scope.

The different Potentiometer terminals (A1, W1, and B1), will be either connected or disconnected depending on the value.

MCP42XX PICtail™ Plus Daughter Board User’s Guide

NOTES:

DAUGHTER BOARD USER’S GUIDE

Top Layer Ground Layer Power Layer Bottom Layer

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the schematics and layout s for the MCP42XX PICtail Plus Daughter Board. Diagrams included in this appendix:

• Board - Schematic

• Board - Top Silk-screen Layer

• Board - Top Component Plus Silk-screen

• Board - Ground Layer

• Board - Power Layer

• Board - Bottom Layer

A.2 SCHEMATICS AND PCB LAYOUT

Figure A.3 shows the schematic of the MCP42XX PICtail Plus Daughter Board. Figure A.4 shows the layout for the top layer of the MCP42XX PICtail Plus Daughter

Board. The layer order is shown in Figure A-1.

MCP42XX PICTAIL™ PLUS

FIGURE A-1: LAYER ORDER

MCP42XX PICtail™ Plus Daughter Board User’s Guide

A.3 BOARD - SCHEMATIC

A.4 BOARD – TOP SILK-SCREEN LAYER

Schematic and Layouts

MCP42XX PICtail™ Plus Daughter Board User’s Guide

A.5 BOARD – TOP COMPONENTS + SILK-SCREEN

A.6 BOARD – GROUND LAYER

Schematic and Layouts

MCP42XX PICtail™ Plus Daughter Board User’s Guide

A.7 BOARD – POWER LAYER

A.8 BOARD – BOTTOM LAYER

Schematic and Layouts

MCP42XX PICtail™ Plus Daughter Board User’s Guide

NOTES:

MCP42XX PICTAIL™ PLUS

DAUGHTER BOARD USER’S GUIDE

Appendix B. Bill Of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

Qty Reference Description Manufacturer Part Number

1 C1 CAP .1UF 25V CERAMIC X7R 0805 Panasonic® - ECG ECJ-2VB1E104K 1 C2 CAP 1.0UF 16V CERAMIC X7R 0805 Kemet 1 J1 CONN HEADER 6POS .100 VERT TIN Molex/Waldom®

3 JP1, JP2, JP3 CONN HEADER 2POS .1 00 VERT TIN Molex/Waldom

4 JMP1, JMP2,

JMP3, JMP4

1 PCB RoHS Compliant Bare PCB,

1 R1 RES 100 OHM 1/8W 1% 0805 SMD Panasonic - ECG ERJ-6ENF1000V 10 R2, R3, R4, R5,

R6, R7, R8, R9,

R11, R16 3 R14, R15, R18 RES 0.0 OHM 1/8W 5% 0805 SMD Rohm MCR10EZPJ000 1 U1 C,ANALOG MUX,DUAL,4-CHAN-

1 U2 MCP414X/416X/424, 7/8-Bit Single/Dual

12 VA0, VW0, VB0,

VA 1, VW1, VB1,

VSS, AVDD Note 1: 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.

CONN HEADER 3POS .100" STR TIN Molex/Waldom

MCP4XXX PICTail Plus Daughter Board

RES 10.0K OHM 1/8W 1% 0805 SMD Panasonic - ECG ERJ-6ENF1002V

NEL,CMOS,SSOP,16PIN,PLASTIC 16-QSOP

SPI Digital POT with Non-Volatile Memory

PC TEST POINT COMPACT SMT Keystone

Electronics C0805C105K4RACTU

22-28-4060

Electronics Corp

22-03-2021

Electronics

90120-0123

Electronics Corp Microchip Technology

Inc.

Maxim MAX4582LEEE

Microchip Technology Inc.

Electronics

104-00182

MCP4261T-103E/ST

5016

TABLE B-2: BILL OF MATERIALS — COMPONENTS NOT INSTALLED

Qty Reference Description Manufacturer Part Number

0 J2 DO NOT POPULATE

CONN HEADER 6POS .100 VERT TIN

0 R10, R12, R13,

R17

Note 1: 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.

DO NOT POPULATE — —

——

MCP42XX PICtail™ Plus Daughter Board User’s Guide

NOTES:

C.1 INTRODUCTION

Channel 4

Channel 1

Channel 2

Channel 3

Channel 4 (Program 2 SDO Signal)

The MCP42XX PICtail Plus Daughter Board can be used in multiple configurations. Only a subset of these configurations are teste d . Th e te sts were perfor m ed with th e configuration shown in Figure C-1. The tested nodes are Channel 1 through Channel 4.

Other configurations, Pad connections, and circuit performance are not tested.

MCP42XX PICTAIL™ PLUS

DAUGHTER BOARD USER’S GUIDE

Appendix C. Board Testing

FIGURE C-1: Tested Jumper Configuration and Test Points.

MCP42XX PICtail™ Plus Daughter Board User’s Guide

C.2 WHAT IS TESTED

The following portions of the board are tested:

• MCP4261 (U2)

- U2 MCP4261 Pot 1 is tested in Potentiometer configuration.

• JMP3 (P1 – P2) - AVDD to P1A

• JMP4 (P1 – P2) - AVSS to P1B

• MAX4582 (U1)

- Y0 (5.0V), Y3 (9.0V), and Y2 (VSS) switching.

• Pads: VW1

C.3 WHAT IS NOT TESTED

The following portions of the board are NOT tested:

•JMP1

•JMP2

• JMP3 (P2 – P3) - VA1 to P1A

• JMP4 (P2 – P3) - VB1 to P1B

• Jumpers: JP1, JP2, and JP3

• MAX4582 (U1)

- Y1 (3.3V) switching.

• J1: PICkit Serial Analyzer Interface (SPI)

• J2: PICkit Serial Analyzer Interface (I

• Pads: VA0, VB0, VW0, VA1, VB1, AVDD, and VSS

• Test Points: A0, B0, A1, and B1

• Connections to unpopulated components

NOTES:

Board Testing

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01/02/08

Microchip Technology MCP42XX, MCP42XX PICtail Plus 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. Product Overview

1.1 INTRODUCTION

1.2 WHAT IS THE MCP42XX PICTAIL PLUS DAUGHTER BOARD?

1.3 WHAT THE MCP42XX PICTAIL PLUS DAUGHTER BOARD KIT INCLUDES

Chapter 2. Installation and Operation

2.1 INTRODUCTION

2.2 FEATURES

2.3 GETTING STARTED

2.4 EXPLORER 16 DAUGHTER DEMO BOARD DEMOS

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

A.2 SCHEMATICS AND PCB LAYOUT

A.3 BOARD - SCHEMATIC

Appendix B. Bill Of Materials (BOM)

C.1 INTRODUCTION

Appendix C. Board Testing

C.2 WHAT IS TESTED

C.3 WHAT IS NOT TESTED

WORLDWIDE SALES AND SERVICE