Microchip Technology MCP401XEV User Manual

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MCP401XEV

Evaluation Board

User’s Guide

Page 2

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in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates.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

The Microchip name and logo, the Microchip logo, dsPIC, K

EELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,

rfPIC and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor, MXDEV, MXLAB, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN, ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP, Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB, MPLINK, mTouch, Octopus, Omniscient Code Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, PIC

logo, REAL ICE, rfLAB, Select Mode, Total Endurance, TSHARC, UniWinDriver, 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.

Printed on recycled paper.

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

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MCP401XEV EVALUATION BOARD

USER ’S GUIDE

Table of Contents

Preface ...........................................................................................................................1

Chapter 1. Product Overview

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

1.2 What is the MCP401XEV Evaluation Board? .................................................5

1.3 What the MCP401XEV Evaluation Board Kit Includes ................................... 6

Chapter 2. Installation and Operation

2.1 Introduction .....................................................................................................7

2.2 Features .........................................................................................................8

2.3 Getting Started ...............................................................................................9

2.4 MCP401XEV Evaluation Board Description ...................................................9

2.5 Configuring The PICkit Serial Analyzer ........................................................13

2.6 MCP40D18EV Demo Steps .........................................................................23

Appendix A. Schematic and Layouts

A.1 Introduction .................................................................................................. 27

A.2 Schematics and PCB Layout ....................................................................... 27

A.3 Board - Schematic .......................................................................................28

A.4 Board - Top Trace, Silk and Pads ............................................................... 29

A.5 Board - Bottom Trace & Pads ......................................................................30

A.6 Board - Layer 2 Ground Plane ....................................................................31

A.7 Board - Layer 3 Power Plane .......................................................................32

A.8 Board - Bottom Silk, Trace and Pads .........................................................33

Appendix B. Bill of Materials (BOM)

Worldwide Sales and Service ....................................................................................36

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MCP401XEV Evaluation Board User’s Guide

NOTES:

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MCP401XEV 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 MCP401XEV Evaluation Board. Items discussed in this chapter include:

• Document Layout

• Conventions Used in this Guide

• The Microchip Web Site

• Customer Support

• Document Revision History

DOCUMENT LAYOUT

This document describes how to use the MCP401XEV Evaluation Board as a development tool to emulate and debug firmware on a t arget board. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MCP401XEV Evaluation Board.

• Chapter 2. “Installation and Operation” – Includes instructions on how to get started with this evaluation board.

• Appendix A. “Schematic and Layouts” – Shows the schematic and layout diagrams for the MCP401XEV Evaluation Board.

• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the MCP401XEV Evaluation Board.

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MCP401XEV 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>

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.

“Save project before build”

4‘b0010, 2‘hF1

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Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the MCP401XEV Evaluation Board and covers the following topics:

• What is the MCP401XEV Evaluation Board?

• What the MCP401XEV Evaluation Board kit includes

1.2 WHAT IS THE MCP401XEV EVALUATION BOARD?

The MCP401XEV Evaluation Board allows the system designer to quickly evaluate the operation of Microchip Technology’s MCP40D18 Digital Potentiometer device. This device is similar to the following devices:

•MCP40D17

•MCP40D19

• MCP4017

• MCP4018

• MCP4019

The board uses the SC70EV Generic PCB and has been p opulated for the MCP40D18. The 6-pin header (PICkit Serial) has been jumpered to the MCP40D18’s appropriate pins. This allows the PICkit Serial to communicate with the device.

Additional blank PCBs may be ordered by using the order number: SC70EV. Each SC70EV kit contains 5 PCBs.

Figure 1-1 shows the top view of the PCB.

USER ’S GUIDE

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MCP401XEV Evaluation Board User’s Guide

0 Ω

MCP

FIGURE 1-1: MCP401XEV Evaluation Board Using the SC70EV Evaluation Board (MCP40D18 installed in U1).

1.3 WHAT THE MCP401XEV EVALUATION BOARD KIT INCLUDES

This MCP401XEV Evaluation Board kit includes:

• MCP401XEV Evaluation Board

• One SC70EV Blank PCB, 102-00273. Extra blank PCBs can be ordered (order #: SC70EV)

• Important Information Sheet

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Chapter 2. Installation and Operation

2.1 INTRODUCTION

The MCP401XEV Evaluation Board allows the system designer to quickly evaluate the operation of the MCP40D18 10 kΩ (-103) Digital Potentiometer device using the PICkit Serial Analyzer. The PICkit Serial Analyzer is available separately (order number: DV164122).

The MCP401XEV Evaluation Board is a minimum configuration for the device. As well as the device, other desired passive components (resistors and capacitors) and connection posts may be installed.

The MCP401XEV Evaluation Board can also be very easily jumpered into a customers existing circuit. This gives an indication of the MCP40D18 device performance, but is affected by the jumper lead length and the EM noise that the jumpers pick up.

The MCP401XEV Evaluation board uses the generic SC70EV Evaluation Board PCB, and includes a second blank PCB. Additional PCB may be ordered (order number: SC70EV). The SC70EV kit includes 5 blank PCBs.

Other boards can be easily built up using th e SC70EV PCB to allow evaluation of other resistance options (5 kΩ, 50 kΩ, or 100 kΩ) or any of the other devices in the following packages:

• SC70 package (uses I

- MCP4017, MCP4018, MCP4019, MCP40D17, or MCP40D19

• SOT-2 3 package (uses Up/Down interface)

- MCP4012, MCP4013, MCP4014, MCP4022, MCP4023, or MCP4024

• DIP-8 Package (uses SPI interface)

- MCP4131, MCP4141, MCP4151, or MCP4161

The MCP401XEV Evaluation Board also has a 6-pin interface (PICkit Serial, ICSP , etc.) whose signals can easily be jumpered to any of the device ’s pins.

Additional information on using the SC70EV Evaluation Board PCB or for modifying the MCP401XEV board is available in the SC70EV User’s Guide (DS51874). Appendix A. “Schematic and Layouts” has information on the PCB schematic and la yout while Figure 2-2 shows components that are installed on the PCB.

MCP401XEV EVALUATION BOARD

USER ’S GUIDE

C interface)

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MCP401XEV Evaluation Board User’s Guide

2.2 FEATURES

The MCP401XEV Evaluation Board has the following features:

• MCP40D18-103AE/LT is installed (I

•0Ω resistors connect MCP40D18 VDD and VSS signals to the appropiate Power or Ground plane (see Figure 2-2)

•0Ω resistors connect MCP40D18 A terminal signal to Power plane, Resistor Network is in a voltage divider configuration (see Figure 2-2)

• Through-hole connection terminal (Orange) for the Wiper pin

• Connection terminals for all device pins (either through-hole or surface-mount)

• Footprints for optional passive componen ts (SMT 805 footprint) for:

- Power supply filtering (C

and C2 footprints)

- Device bypass capacitor (RxD footprint for device pin connected to V

• Silk-screen area to write specifics of implemented circuit (on back of PCB), such as MCP4018 10 kΩ

• PICkit Serial Analyzer Header

The included SC70EV Board has the following features:

• Connection terminals may be either through-hole or surface-mount

• Three package type footprints supported:

-SC70-6

-SC70-5

-SC70-3

-SOT-23-8

-SOT-23-6

-SOT-23-5

-SOT-23-3

- DIP-8 (300 millimeter spacing)

• Footprints for optional passive components (SMD 805 footprint) for:

- Power supply filtering (C

and C2 footprints)

- Device bypass capacitor (RxD footprint for device pin connected to V

- Output filtering (RxD footprint)

- Output pull-up resistor (RxU footprint)

- Output pull-down resistor (RxD footprint)

- Output loading resistor (RxD footprint)

• Silk-screen area to write specifics of implemented circuit (on back of PCB), such as MCP4018 10 kΩ

• Can be used for SC70 or SOT-23 to DIP-8 converter

• PICkit Serial Analyzer / PICkit 2 Programming (ICSP) Header

C address of 7Ch)

)

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Installation and Operation

2.3 GETTING STARTED

The MCP401XEV Evaluation Board allows quick evaluation of the MCP40D18-103AE/LT device. This device is in the potentiometer configuration with terminal B internally tied to ground. This devices has an R 10 kΩ and has a slave I

• Using the PICkit Serial Analyzer for interface communication

• Jumpering the MCP401XEV Evaluation Board into your application circuit to control the MCP40D18-103A device

This user guide will discuss the steps needed to evaluate the MCP40D18-103AE/LT device using the PICkit Serial Analyzer (order number: DV164122).

Section 2.5 “Configuring The PICkit Serial Analyzer” shows the steps to configure the PICkit Serial Analyzer as well as create User Script files which are used to communicate with the MCP40D18, based on the devices I format.

2.4 MCP401XEV EVALUATION BOARD DESCRIPTION

The MCP401XEV Evaluation Board uses the flexible SC70EV Evaluation Board PCB. This simple Evaluation Board allows the system designer to quickly evaluate the operation of the MCP40D18-103A device (R

C address = 7Ch) using the PICkit Serial Ana lyzer or by jumpering the board into their application system. The PICkit Serial Analyzer is availa ble separately (ord er num b er : DV164122).

C device address of 7Ch. Evaluation can be done by:

AB(TYP)

resistance that is typically

C communication protocol

= 10 kΩ and has a device slave

2.4.1 The Hardware

Figure 2-2 shows the component layout of the MCP401XEV Evaluation Board. This is a small four-layer board (1.43" x 1.255" (36. 32 2 mm x 31.877 mm)). There are te n connection points/pads that can use either through-hole or surface-mount connector posts.

The pad labeled VDD is connected to the PCB power plane, while the pad labeled VSS is connected to the PCB ground plane. All the passive co mponents that are connected to VDD or VSS are connected to either the power plane or ground plane.

The eight remaining PCB pads correspond to the device pins (i.e.; pad 1 connects to pin 1).

Each pad has two passive components associated with them: a pu ll-up re sistor and a pull-down resistor. The pull-up resistor is always RXU and the pull-down resistor is RXD. The “X” is a numeric value that corresponds to a particular pad (1 to 8). As an example, Pad 5’s pull-up resistor is R5U. Capacitor C1 and C2 are the power supply filtering capacitors. For whichever pin is the device’s VDD, the RxD component footprint can be used for the device’s bypass capacitor. Table 2-2 describes the components.

A 6-pin header interface is available to support the PICkit Serial or the PICmicro In-Circuit Serial Programming (ICSP) interface.

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SC70-6

(1, 2)

1 2

6 5

DIP-8

(1)

NC VDD V

SDA SCL NC

PICkit

SOT-23-8

(1, 2)

1 2

8 7 6

Requires blue

Serial

Interface

wire jumpering to connect the PICkit Interface to the selected device.

P1 P2

R1U = 0Ω

= 0Ω

R8U = 0Ω

SOT-23-6

(1, 2)

1 2

6 5

P8 P7 P6

Note 1: The SC70 V

(SOT-23 VSS) signal is connected to the DIP-8 VDD/VSS signal, and the SC70 VSS

(SOT-23 V

) signal is connected to the DIP-8 VSS/VDD signal.

2: Only one of the SC70 or SOT-23 footprints may be populated at a give time. 3: The SC70-6 and SOT-23-8 footprints are superimposed on the PCB due to the similarity of the

package lead width and lead pitch dimensions.

MCP40D18

Magenta text indicates installed components. Does not include two “blue wire” jumpers from PICkit Serial interface vias to device pin vias.

MCP401XEV Evaluation Board User’s Guide

FIGURE 2-1: SC70EV Evaluation Board Circuit.

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Installation and Operation

0 Ω

Through hole Test Point (Orange)

Two Blue Wire Jumpers to connect PICkit Serial interface to device pins

MCP40D18-103AE/LT installed in U1 (SC70-6 footprint)

0 Ω

1x6 Male Header , with 90° right angle

40D18

Connected to Ground Plane

Connected to Power Plane

FIGURE 2-2: MCP401XEV Evaluation Board Component Placement Using the SC70EV Evaluation Board (Top).

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MCP401XEV Evaluation Board User’s Guide

TABLE 2-1: INSTALLED PASSIVE COMPONENTS

Component Description Comment

R1U, R8U 0Ω SMT 805 Pull-up resistor R2D 0Ω SMT 805 Pull-down resistor U1 MCP40D18-103AE/LT 10 kΩ, Device I P7 Test Point - through hole connector

(Orange)

J1 1x6 Male Header, 100 mil spacing

90° angle.

— Blue Wire:

(2)

(1)

C Slave Address = 7Ch

1 x 6 male Header

See Figure 2-2

J1 SCL via to P3 via J1 SDA via to P6 via

Note 1: Whichever pin is the device’s VDD pin, that corresponding RXD footprint can be used for the device’s

bypass capacitor. So if Pin 8 is the device’s VDD pin, then install the bypass capacitor in the R8D footprint.

2: All passive components use the surface mount 805 footprint.

(1)

(2)

(3)

TABLE 2-2: OPTIONAL PASSIVE COMPONENTS - NOT INSTALLED

Component Comment

C1, C2 Power supply bypass capacitors R2U, R3U, R4U, R5U, R6U, R7U Pull-up resistor R1D, R3D, R4D, R5D, R6D, R7D, R8D Pull-down resistor U2, U3, U4 Alternate package footprints VDD, GND Power and Ground plane connection points P1, P2, P3, P4, P5, P6, P8 Test Point connectors Note 1: Whichever pin is the device’s VDD pin, that corresponding RXD footprint can be used for the device’s

bypass capacitor. So if Pin 8 is the device’s VDD pin, then install the bypass cap acitor in the R8D footprint.

2: All passive components use the surface mount 805 footprint. 3: If board is powered via the VDD and GND connection points, the use of bypass capacitors on C1 and C2

may improve performance. The benefit is reduced if the board is powered via the PICkit Serial interface.

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Installation and Operation

2.5 CONFIGURING THE PICKIT SERIAL ANALYZER

Figure 2-3 shows the PICkit Serial Window after the program has started. The Transaction window indicates if the PICkit Serial GUI located the PICkit Serial Analyzer Hardware. When starting the PICkit Serial Analyzer for the 1st time, some setup questions may be asked. If you have any questions, please refer to the PICkit Serial Analyzer documentation, available at www.Microchip.com/PICkitSerial.

FIGURE 2-3: PICkit Serial Main Window at Startup.

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MCP401XEV Evaluation Board User’s Guide

We need to select the PICkit Serial Analyzer GUI to be in I2C Master mode. Figure 2-4 shows how to select the proper mode. Select PICkit Serial Analyzer -> Select Communications Mode -> I2C Master menu item (make sure the I2C Master item is checked).

FIGURE 2-4: PICkit Serial Selecting Communications Mode.

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Installation and Operation

Now we need to configure the mode that we have selected. Figure 2-5 shows how to select the communications mode. Select PICkit Serial Analyzer -> Configure Communications Mode menu item. This will open a new window.

FIGURE 2-5: PICkit Serial Main Window at Startup.

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MCP401XEV Evaluation Board User’s Guide

Figure 2-6 shows the Configure Communications Mode window. Ensure that your window options and settings are the same as in this window , and then select the “Save Changes” button.

FIGURE 2-6: PICkit Serial Configure Communications Mode Window.

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Installation and Operation

Now we are going to create some custom scripts to match the MCP40D18 read and write commands. To open the Script Builder window, select the Communications -> Script -> Script Builder menu item (see Figure 2-7).

FIGURE 2-7: PICkit Serial - Script Bulider Menu Selection.

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MCP401XEV Evaluation Board User’s Guide

This will open the Script Builder window (Figure 2-8). In this window we see five Example I Script Files to create our User I

C Master Scripts. We will use the ReadAddrA8 and WriteAddrA8 Example

C Master Scripts.

FIGURE 2-8: PICkit Serial Main Window at Startup.

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Installation and Operation

Number of Bytes that will be written

I2C Slave Address + Read/Write bit (R/W bit = 0)

Data Byte #1

(1)

Data Byte #2

(1)

Note 1: Function depends on devices I

C Protocol Format.

Double clicking on the WriteAddrA8 Example I2CM Script will load the Script Details. Figure 2-9 shows what the values mean in the Script Details. These values are hex numbers.

The first value (03h), is the number of bytes that will be written. The second byte is the

C Slave address (A8h) of the device with the Read/Write bit forced to ‘0’ (an I2C write). The next two bytes (02h and 33h) are data bytes, and these value will be dependent on the slave I

C device protocol format and the desired operation.

FIGURE 2-9: Example Write Script.

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MCP401XEV Evaluation Board User’s Guide

Number of Bytes that will be written

I2C Slave Address + Read/Write bit (R/W bit = 0)

Data Byte #1

(1)

Number of Bytes that will be written

I2C Slave Address + Read/Write bit (R/W bit = 1)

# of Data Bytes to Read

(1)

Note 1: Function depends on devices I

C Protocol Format.

Double clicking on the ReadAddrA8 Example I2CM Script will load the Script Details. Figure 2-10 shows what the values mean in the Script Details. These values are hex numbers.

The first value (02h) is the number of bytes that will be written. The second byte is the

C Slave address (A8h) of the device with the Read/Write bit forced to ‘0’ (an I2C

write). The next byte (00h) is a data byte, and the value will be dependent on the slave

C device protocol format and the desired operation.

Now a I many bytes will be written. The next bit (A9h) is the I device with the Read/Write bit forced to ‘1’ (an I number of bytes that will be read from the I dependent on the slave I

C Restart bit is forced onto the I2C bus. The next byte (01h) indicates how

C device protocol format and the desired operation.

C Slave address (A8h) of the

C read). The last byte (10h) is the

C Slave Device. The value will be

FIGURE 2-10: Example Read Script.

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Installation and Operation

Device I2C Address + Read/Write bit (= ‘0’)

Command Code = “00” (in Hex)

Data value to write to Wiper = 7F (in hex)

To create the write script for the MCP40D18, double click on the WriteAddrA8 scrip t in the “Example I2CM Scripts” column. This loads the script (see Figure 2-9) into the “Script Detail” column. Modify the script details so that it looks like Figure 2-11. Then, in the “Script Name” write the name that you would like to call the script. We chose “MCP40D18_Write” (see Figure 2-11).

Then click on the “Save Script” button. This will save the script, which can then be accessed under the “User I2CM Script” column (see Figure 2-11). This script will be available when the GUI is opened in the future (unless the script has been cleared or deleted).

Note: The saved User Scripts are saved to a text file. The file is saved in the

PICkit Serial Analyzer directory. This User Scripts file is called:

CommScripts.txt

The default install location of the file is:

C:\Program Files\Microchip\PICkit Serial Analyzer

FIGURE 2-11: MCP40D18 Write Script File.

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MCP401XEV Evaluation Board User’s Guide

Device I2C Address + Read/Write bit (= ‘0’)

Command Code = “00” (in Hex)

Device I2C Address + Read/Write bit (= ‘1’)

# of Data bytes to read

To create the read script for the MCP40D18, double click on the ReadAddrA8 script in the “Example I2CM Scripts” column. This loads the script (see Figure 2-10) into the “Script Detail” column. Modify the script details so that it looks like Figure 2-12. Then, in the “Script Name” write the name that you would like to call the script. We chose “MCP40D18_Read” (see Figure 2-12).

Note: The saved User Scripts are saved to a text file. The file is saved in the

PICkit Serial Analyzer directory. This User Scripts file is called:

CommScripts.txt

The default install location of the file is:

C:\Program Files\Microchip\PICkit Serial Analyzer

FIGURE 2-12: MCP40D18 Read Script File.

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2.6 MCP40D18EV DEMO STEPS

Installation and Operation

This demo assumes that you know how to configure the PICkit Ser ial Ana lyz er for Master I

C operation. See Section 2.5 “Configuring The PICkit Serial Analyzer” or

the PICkit Serial Analyzer User’s Guide (DS51647) for additional information.

1. Plug the PICkit Serial device into the PC’s USB port.

2. Plug the MCP40D18EV board into the PICkit Serial.

3. Start the PICkit Serial GUI.

4. Ensure the GUI is in Master I

5. Ensure that the Master I

C communication mode (see Figure 2-4).

C configuration is appropriately configured (see

Figure 2-6).

6. Measure the wiper voltage on the MCP40D18EV board using an oscilliscope or

digital multimeter. Measure voltage from the ground plane (GND) to the Wiper (P7). The voltage on the wiper should be ~ V

/2 (~2.5V).

7. Open the Script Builder window (see Figure 2-7).

8. Double click on the “WriteAddrA8” script in the “Example I2CM Scripts column.

This loads the Script Detail column (see Figure 2-9).

9. Modify the “Script Detail” so that it is like that shown in Figure 2-13.

10. Click on the “Execute Script” button. This executes the script shown in the script

detail column, which will update the wiper value to 7Fh. The Wiper voltage will now be ~V

(~5V). The Transaction window (see Figure 2-15) will be updated

to indicate the execution of the script.

1 1. Select the “MCP40D18_Read” script in the User I2CM Script s colu mn. It should

look like Figure 2-14.

12. Click on the “Execute Script” button. This executes the script shown in the script

detail column. The Transaction window (see Figure 2-15) will be updated to indicate the execution of the script. The Data read is shown in the last line.

13. Select the “MCP40D18_Write ” script in the User I2CM Script s column. It should

look like Figure 2-13.

14. Modify the data value to write to the wiper (see Figure 2-13) to 1Fh.

15. Click on the “Execute Script” button. This executes the script shown in the script

detail column, which will update the wiper value to 1Fh (from 7Fh). The Wiper voltage will now be ~1/4*V

(~1.25V). The Transaction window (see

Figure 2-16) will be updated to indic ate the execution of the script.

16. Select the “MCP40D18_Read” script in th e User I2CM Script s colu mn. It should

look like Figure 2-14.

17. Click on the “Execute Script” button. This executes the script shown in the script

detail column. The Transaction window (see Figure 2-16) will be updated to indicate the execution of the script. The Data read is shown in the last line.

18. You can repeate the sequence of writing values to the wiper register or Writing

then reading the values back.

NOTICE

If at any time during script execution, an error message is generated in the transaction window, it is good practice to reset the PICkit Serial Analyzer (PKSA). The PKSA can be reset using the “Reset” toolbar icon. Verify that subsequent script operations do not generate errors.

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MCP401XEV Evaluation Board User’s Guide

Data value to write to Wiper

FIGURE 2-13: MCP40D18 Write Script File - Updating Wiper Value.

FIGURE 2-14: MCP40D18 Read Script File.

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Installation and Operation

Data value writen to Wiper register

Data value read from Wiper register

Data value written to Wiper register

Data value read from Wiper register

FIGURE 2-15: MCP40D18 Transaction Windows 1 and 2.

FIGURE 2-16: MCP40D18 Transaction Windows 3 and 4.

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MCP401XEV Evaluation Board User’s Guide

2.6.1 The SC70EV PCB and Supported Digital Potentiometers

Table 2-3 shows the current Digital Potentiomers that are supported by the SC70EV PCB.

TABLE 2-3: SC70EV PCB SUPPORTED DIGITAL POTENTIOMETERS

Device SC70 SOT-23 DIP Comment

MCP4012 — Yes — SOT-23-6, uses Up/Down interface MCP4013 — Yes — SOT-23-6, uses Up/Down interface MCP4014 — Yes — SOT-23-5, uses Up/Down interface MCP4017 Yes — — MCP40D17 Yes — — MCP4018 Yes — — MCP40D18 Yes — — MCP4019 Yes — — MCP40D19 Yes — — MCP4022 — Yes — SOT-23-6, uses Up/Down interface MCP4023 — Yes — SOT-23-6, uses Up/Down interface MCP4024 — Yes — SOT-23-5, uses Up/Down interface MCP4131 — — Yes Has multiplexed SDI/SDO MCP4132 ——Yes MCP4141 — — Yes Has multiplexed SDI/SDO MCP4142 ——Yes MCP4151 — — Yes Has multiplexed SDI/SDO MCP4152 ——Yes MCP4161 — — Yes Has multiplexed SDI/SDO MCP4162 ——Yes MCP41010 ——Yes MCP41050 ——Yes MCP41100 ——Yes

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MCP401XEV EVALUATION BOARD

Top Layer Ground Layer Power Layer Bottom Layer

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the schematics and layouts for th e MCP401XEV Evaluation Board. Diagrams included in this appendix:

• Board - Schematic

• Board - Top Trace, Silk and Pads

• Board - Bottom Trace & Pads

• Board - Layer 2 Ground Plane

• Board - Layer 3 Power Plane

• Board - Bottom Silk, Trace and Pads

A.2 SCHEMATICS AND PCB LAYOUT

Board - Schematic shows the schematic of the MCP401XEV Evaluation Board. The layer order is shown in Figure A-1.

USER ’S GUIDE

FIGURE A-1: Layer Order.

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MCP401XEV Evaluation Board User’s Guide

A.3 BOARD - SCHEMATIC

Page 33

A.4 BOARD - TOP TRACE, SILK AND PADS

Schematic and Layouts

Page 34

MCP401XEV Evaluation Board User’s Guide

A.5 BOARD - BOTTOM T RACE & PADS

Page 35

A.6 BOARD - LAYER 2 GROUND PLANE

Schematic and Layouts

Page 36

MCP401XEV Evaluation Board User’s Guide

A.7 BOARD - LAYER 3 POWER PLANE

Page 37

Schematic and Layouts

A.8 BOARD - BOTTOM SILK, TRACE AND PADS

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MCP401XEV Evaluation Board User’s Guide

NOTES:

Page 39

MCP401XEV EVALUATION BOARD

USER ’S GUIDE

Appendix B. Bill of Materials (BOM)

TABLE B-1: BILL OF MATERIALS

Qty Reference Description Manufacturer Part Number

1 J1 CONN HEADER 6POS .100 R/A GOLD Molex/Waldom

Electronics Corp 1 P7 TEST POINT PC MULTI PURPOSE ORG Keystone Electronics 2PCB Note 1 Microchip Technology Inc. 104-00273 (Note 3) 3 R1U, R8U,

R2D

1 U1 7-Bit Single I2C™ (with Command Code)

— Blue Wire:

Note 1: This assembly uses RoHS Compliant SC70-6 and SOT-23-6/8 to DIP-8 Evaluation Board.

2: 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.

3: This part number is an internal Microchip number; if a customer wants to order, the SC70EV order number

needs to be used.

RES 0.0 OHM 1/8W 5% 0805 SMD Panasonic

Microchip Technology Inc. MCP40D18-103AE/LT

Digital POT with Volatile Memory in SC70

See Figure 2-2 —

J1 SCL via to P3 via J1 SDA via to P6 via

- ECG ERJ-6GEY0R00V

22-28-8062

5013

Page 40

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12/30/09

Page 41

Mouser Electronics

Authorized Distributor

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Microchip: MCP401XEV