Microchip Technology MCP43XXEV Evaluation Board User guide

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MCP43XXEV

Evaluation Board

User’s Guide

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MCP43XXEV EVALUATION BOARD

USER’S GUIDE

Table of Contents

Preface ...........................................................................................................................5

Chapter 1. Product Overview

1.1 Introduction .....................................................................................................9

1.2 What is the MCP43XXEV Evaluation Board? ................................................9

1.3 What the MCP43XXEV Evaluation Board Kit Includes ................................10

Chapter 2. Installation and Operation

2.1 Introduction ...................................................................................................11

2.2 Features .......... ............... .............................................................................. 12

2.3 Getting Sta rted .... .. .................................................................................. ..... 13

2.4 MCP43XXEV Evaluation Board Description ..................................... ...........13

2.5 Configuring The PICkit Serial Analyzer ........................................................19

2.6 MCP4361 Demo Steps .................................................................................28

Appendix A. Schematic and Layouts

A.1 Introduction ..................................................................................................33

A.2 Schematics and PCB Layout ................................................................. .. .. ..33

A.3 Board – Sch ematic ... .. ............. .. .. ................................................................. 34

A.4 Board – Top Trace, Silk and Pads ..............................................................35

A.5 Board – Bott o m Tr a ce a n d Pa d s .......... ........................................................ 36

A.6 Board – Layer 2 Ground Plane ...................................................................37

A.7 Board – Layer 3 Power Plane ......................................................................38

A.8 Board Layout – Top Components .............. .. .. .. ............................................39

A.9 Board – Bottom Silk, Trace and Pads ........................................................40

Appendix B. Bill of Materials (BOM)

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

MCP43XXEV Evaluation Board User’s Guide

NOTES:

MCP43XXEV 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 p age 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 MCP43XXEV 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 MCP43XXEV Evaluation Board as a development tool to emulate and debug firmware on a target board. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MCP43XXEV 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 MCP43XXEV Evaluation Board.

• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the MCP43XXEV Evaluation Board.

MCP43XXEV Evaluation Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following docum entat io n conven tion s:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic chara c ters Referenced books MPLAB

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 brac kets < > A key on the keyboard Press <Enter>, <F1>

A menu path File>Save

A tab Click the Power tab

where N is the tota l number of digits, R is th e radi x and n is a digit.

IDE User’s Guide

“Save project before build”

4‘b0010, 2‘hF1

Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the MCP43XXEV Evaluation Board and covers the following topics:

• What is the MCP43XXEV Evaluation Board?

• What the MCP43XXEV Evaluation Board kit includes

1.2 WHAT IS THE MCP43XXEV EVALUATION BOARD?

The MCP43XXEV Evaluation Board allows the system designer to quickly evaluate the operation of Microchip Technology’s MCP4361 Digital Potentiometer device. This device is similar to the following devices:

• MCP4331

• MCP4332

• MCP4341

• MCP4342

• MCP4351

• MCP4352

• MCP4362

• MCP4231

• MCP4232

• MCP4241

• MCP4242

• MCP4251

• MCP4252

• MCP4261

• MCP4262

The board uses the TSSOP20EV Generic PCB and has been populated for the MCP4361. The 6-pin header (PICkit Serial) has been jumpered to the MCP4361’s appropriate pins. This allows the PICkit Serial to communicate with the device.

Additional blank PCBs may be ordered by using the order number: TSSOP20EV. Each TSSOP20EV kit contains 5 PCBs.

Figure 1-1 shows the top view of the populated TSSOP20EV PCB, which creates the MCP43XXEV Evaluation Board.

USER’S GUIDE

MCP43XXEV Evaluation Board User’s Guide

Through-hole Test Point (Orange) Wiper 3

MCP4361-103E/ST installed in U3 (TSSOP-20 footprint)

Through-hole Test Point (Orange) Wiper 1

Connected to Ground Plane

0 Ω

Connected to Power Plane

0 Ω

Through-hole Test Point (Orange) Wiper 2

0 Ω 0 Ω

10 kΩ

MCP4361

10 kΩ

Through-hole Test

0 Ω

Point (Orange) Wiper 0

Four Blue Wire

0 Ω

Jumpers to connect

PICkit Serial interface (SPI) to device pins

1x6 Male Header, with 90° right angle

FIGURE 1-1: MCP43XXEV Evaluation Board Using the TSSOP20EV Evaluation Board (MCP4361 installed in U3).

1.3 WHAT THE MCP43XXEV EVALUATION BOARD KIT INCLUDES

This MCP43XXEV Evaluation Board kit includes:

• MCP43XXEV Evaluation Board

• One TSSOP-20 and SSOP-20 Evaluation Board blank PCB, 102-00272. Extra blank PCBs can be ordered (order #: TSSOP20EV)

• Important Information Sheet

Chapter 2. Installation and Operation

2.1 INTRODUCTION

The MCP43XXEV Evaluation Board allows the system designer to quickly evaluate the operation of the MCP4361 10 kΩ (-103) Digital Potentiometer device using the PICkit Serial Analyzer. The PICkit Serial Analyzer is available separately (order number: DV164122).

This 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 board can also be very easily jumpered into a customer’s existing circuit. This gives an indication of the MCP4361 device performance, but is affected by the jumper lead length and the EM noise that the jumpers pick up.

The device’s resistor networks 0 and 2 have be configured in a potentiometer mode with the A terminal connected to V connected to V rheostat operation.

The MCP43XXEV Evaluation Board uses the generic TSSOP20EV Evaluation Board PCB. The kit includes a second PCB which is blank for the user to populate as desired. Additional PCBs may be ordered (order number: TSSOP20EV). The TSSOP20EV kit includes 5 blank PCBs.

Other boards can easily be built up using the TSSOP20EV PCB to allow evaluation of other resistance options (5 kΩ, 50 kΩ, or 100 kΩ) or any of the other digital potentiometer devices in the following packages:

• TSSOP-20 package

- MCP4331, MCP4341, MCP4351, or MCP4361

• TSSOP-14 package

- MCP4332, MCP4342, MCP4352, MCP4362, MCP4231, MCP4241, MCP4251, MCP4261, MCP4631, MCP4641, MCP4651, MCP4661, MCP42010, MCP42050, or MCP42100

The 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 TSSOP20EV Evaluation Board PCB or for modifying the MCP43XXEV board is available in the TSSOP20EV User’s Guide (DS51875). Appendix A. “Schematic and Layouts” has information of the PCB schematic and layout while Figure 2-2 shows components that are installed on the PCB.

MCP43XXEV EVALUATION BOARD

USER’S GUIDE

through a 0Ω resistor and the B terminal

with a 0Ω resistor. Resistor networks 1 and 3 can be evaluated for

MCP43XXEV Evaluation Board User’s Guide

2.2 FEATURES

The MCP43XXEV Evaluation Board has the following features:

• MCP4361-103E/ST is installed

•0Ω resistors connect MCP4361 V Ground plane (see Figure 2-2)

•0Ω resistors connect MCP4361’s Resistor Network 0 and 2 A terminal signal to Power plane, Resistor Network is in a voltage divider configuration (see Figure 2-2)

•0Ω resistors connect MCP4361’s Resistor Network 0 and 2 B terminal signal to Ground plane, Resistor Network is in a voltage divider configuration (see Figure 2-2)

• Through-hole connection terminal (Orange) for all Wiper pins

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

• Footprints for optional passive components (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 MCP4361 10 kΩ

• PICkit Serial Analyzer Header

The included TSSOP20EV Board has the following features:

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

• Three package type footprints supported:

-TSSOP-20

-TSSOP-14

-TSSOP-8

-SSOP-20

- DIP-20 (600 mil body)

• Footprints for optional passive components (SMT 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 MCP4361 10 kΩ

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

and VSS signals to the appropriate Power or

)

Installation and Operation

2.3 GETTING STARTED

The MCP43XXEV Evaluation Board allows quick evaluation of the MCP4361-103E/ST device. The understanding of the device characteristics (such as the resistor network) is applicable to any of the devices in the MCP43XX family. The MCP4361-103 device has a typically R

• Using the PICkit Serial Analyzer for interface communication

• Jumpering the MCP43XXEV Evaluation Board into your application circuit to control the MCP4361-103 device

This User Guide will discuss the steps needed to evaluate the MCP4361-103E/ST 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 MCP4361, based on the devices SPI communication protocol format.

2.4 MCP43XXEV EVALUATION BOARD DESCRIPTION

The MCP43XXEV Evaluation Board uses the flexible TSSOP20EV Evaluation Board PCB. This simple Evaluation Board allows the system designer to quickly evaluate the operation of the MCP4361-103 device (R Analyzer or by jumpering the board into their application system. The PICkit Serial Analyzer is available separately (order number: DV164122).

resistance of 10 kΩ. Evaluation can be done by:

AB(TYP)

= 10 kΩ ) using the PICkit Serial

2.4.1 The Hardware

Figure 2-2 shows the component layout of the MCP43XXEV Evaluation Board. This is a small four-layer board ( 3.9" x 2.1" (99.06 mm x 53.34 mm)). There are twenty two connection points/pads that can use either through-hole or surface-mount connector posts.

The pad labeled V is connected to the PCB ground plane. All the passive components that are connected to V

or VSS are connected to either the power plane or ground plane.

The twenty 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 pull-up resistor 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 V 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 PIC MCU In-Circuit Serial Programming (ICSP ) interface.

is connected to the PCB power plane, while the pad labeled VSS

, the RxD component footprint

MCP43XXEV Evaluation Board User’s Guide

P1 P2

PICkit Serial / ICSP

Interface

VSS SDI SCK SDO

VSS SDA SCL NC

DIP-20 (1)

P20

P19

P12

P11

Requires blue wire jumpering to connect the PICkit Interface to the selected device

P19

P10

TSSOP-20 (1)

P20

P12

SSOP-20

P10

VIA1

9 10

XTAL

VIA2

P19

P11

19U

19D

20U

P20

20D

PIC Circuitry (bottom of PCB)

Note: The TSSOP-14 device (Rheostat) will use the TSSOP-20 footprint, with not all pins

connected.

FIGURE 2-1: TSSOP20EV Evaluation Board Circuit.

Installation and Operation

MCP4361-103E/ST

installed in U3 (TSSOP-20 footprint)

Connected to Ground Plane

Connected to Power Plane

Through-hole Test Point (Orange) Wiper 3

Through-hole Test Point (Orange) Wiper 1

0 Ω

Through-hole Test Point (Orange) Wiper 2

0 Ω 0 Ω

10 kΩ

MCP4361

10 kΩ

Through-hole Test

0 Ω

Point (Orange) Wiper 0

0 Ω

Four Blue Wire Jumpers to connect PICkit Serial interface (SPI) to device pins

1x6 Male Header, with 90° right angle

FIGURE 2-2: MCP43XXEV Evaluation Board Component Placement Using the TSSOP20EV Evaluation Board (Top).

MCP43XXEV Evaluation Board User’s Guide

TABLE 2-1: INSTALLED PASSIVE COMPONENTS

Component Description Comment

R11U, R17U, R20U 0Ω SMT 805 Pull-up resistor R14U, R15U 10 kΩ SMT 805 Pull-up resistor R7D, R13D, R18D 0Ω SMT 805 Pull-d own resi sto r U3 MCP4361-103E/ST R P2, P9, P12, P19 Test Point - through-hole connector

(Orange)

J1 1x6 Male Header, 100 mil spacing 90°

angle.

— Blue Wire:

(2)

(1)

= 10 kΩ

AB(TYP)

PICkit Serial / ICSP header

See Figure 2-2

J1 CS/NC via to P4 via J1 SDI/SDA via to P16 via J1 SCK/SCL via to P5 via J1 SDO/NC 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.

Installation and Operation

pin, then

(2)

(3)

TABLE 2-2: OPTIONAL PASSIVE COMPONENTS - NOT INSTALLED

Component Comment

C1, C2 Power supply bypass capacitors C3, C4 PIC Crystal capacitors R1U, R2U, R3U, R4U, R5U, R6U, R7U, R8U,

R9U, R12U, R13U, R16U, R18U, R19U R1D, R2D, R3D, R4D, R5D, R6D, R8D, R9D,

R10D, R11D, R12D, R14D, R15D, R16D, R17D, R19D, R20D

U1, U2 Alternate package footprints VDD, GND Power and Ground plane connection

Y1 Can connect to either PIC’ main oscillator

P1, P3, P4, P5, P6, P8, P10, P1 1, P13, P14, P15, P16, P17, P18, P20

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 V install the by pass capacitor in the R8D footprint.

2: All passive components use the surface mount 805 footprint. 3: If the board is po w ered via the V

capacitors on C1 and C2 may improve performance. The benefit is reduced if the board is powered via the PICkit Serial interface.

Pull-up resistor

(1)

Pull-down resistor

points

or to the Timer oscillator circuit. Test Point connectors

and GND connection points, the use of bypass

MCP43XXEV Evaluation Board User’s Guide

2.4.2 The MCP4361 Device

T o make variations to the commands sent to the MCP4361 device (from the commands shown in the demo section), one must know the device memory map (see Table 2-3) and the command formats (see Figure 2-3). For additional device operational information, refer to the MCP4361 device data sheet (DS22233).

TABLE 2-3: MEMORY MAP AND THE SUPPORTED COMMANDS

Memory

Type

Allowed Commands

Increment, Decrement

RAM Read, Write Increment, Decrement

Increment, Decrement

RAM Read, Write Increment, Decrement

pin to the VIH level and then back to the ac tive

Address Function

00h Volatile Wiper 0 RAM Read, Write,

01h Volatile Wiper 1 RAM Read, Write,

02h Non-Volatile Wiper 0 EEPROM Read, Write 03h Non-Volatile Wiper 1 EEPROM Read, Write 04h Volatile

TCON0 Register

05h Status Register RAM Read Write, Increment,

06h Volatile Wiper 2 RAM Read, Write,

07h Volatile Wiper 3 RAM Read, Write,

08h Non-Volatile Wiper 2 EEPROM Read, Write 09h Non-Volatile Wiper 3 EEPROM Read, Write 0Ah Volatile

TCON1 Register

0Bh - 0Fh Data EEPROM EEPROM Read, Write

Note 1: When an EEPROM write is active, these are invalid commands and will generate

an error condition. The user should use a read of the Status register to determine when the write cycle ha s co mpleted. To exit the error condition, the user must t ak e

pin to the VIH level and then back to the active state (VIL or V

the CS

2: This command on this address will generate an error condition. To exit the error

condition, the user must t ake the C S state (V

or V

IHH

Disallowed

Commands

—

(1)

Increment, Decrement

(1)

Increment, Decrement

Decrement

—

(1)

Increment, Decrement

(1)

Increment, Decrement

(1)

Increment, Decrement

IHH

(2)

8-bit Command

(Increment or Decrement)

Command Byte

C1C0D9D

Command Byte

16-bit Command

(Read Data or Write Data)

Data Byte

C1C0D9D8D7D6D5D4D3D2D1D

Command

Bits

C C 1 0

Address

Command

Bits

Data Bits

Address

Command

Data Bits

Bits

0 0 = Write Data 0 1 = INCR 1 0 = DECR 1 1 = Read Data

FIGURE 2-3: MCP43XX SPI Command Formats.

Installation and Operation

2.5 CONFIGURING THE PICKIT SERIAL ANALYZER

2.5.1 Modifying the “CommScripts.txt” file

Example 2-1 shows the User Scripts that need to be added to the PICkit Serial’s “CommScripts.txt “ file. The default install location of this file is:

C:\Program Files\Microchi p\P ICk it Seri al Ana ly zer

Once these are saved in the “CommScripts.txt “ file and the Master SPI mode is selected as the communication mode, these user scripts will be available to select from.

NOTICE

Note 1: It is recommended that you make a backup of your “CommScript.txt” file

before making any edits with a text editor.

2: It has been observed that copying the text from this PDF and pasting into

the PICkit Serial’s “CommScript.txt” file will cause errors due to the blank spacing used in the PDF file. Please copy from the “MCP43XX CommScript.txt” file available from the Microchip web site.

EXAMPLE 2-1: MCP43XX SCRIPT FILE (COMMSCRIPTS.TXT)

WriteWiper0 SPI SPICSON SPIDATOUT 0x02 0x00 0x3F SPICSOFF ReadWiper0 SPI SPICSON SPIDATIO 0x02 0x0C 0xA5 SPICSOFF WriteWiper1 SPI SPICSON SPIDATOUT 0x02 0x10 0x3F SPICSOFF ReadWiper1 SPI SPICSON SPIDATIO 0x02 0x1C 0xA5 SPICSOFF WriteWiper2 SPI SPICSON SPIDATOUT 0x02 0x60 0x3F SPICSOFF ReadWiper2 SPI SPICSON SPIDATIO 0x02 0x6C 0xA5 SPICSOFF WriteWiper3 SPI SPICSON SPIDATOUT 0x02 0x70 0x3F SPICSOFF ReadWiper3 SPI SPICSON SPIDATIO 0x02 0x7C 0xA5 SPICSOFF WriteWiper0NV SPI SPICSON SPIDATOUT 0x02 0x20 0x3F SPICSOFF ReadWiper0NV SPI SPICSON SPIDATIO 0x02 0x2C 0xA5 SPICSOFF WriteTCON0 SPI SPICSON SPIDATOUT 0x02 0x40 0xFF SPICSOFF ReadTCON0 SPI SPICSON SPIDATIO 0x02 0x4C 0xA5 SPICSOFF WriteTCON1 SPI SPICSON SPIDATOUT 0x02 0xA0 0xFF SPICSOFF ReadTCON1 SPI SPICSON SPIDATIO 0x02 0xAC 0xA5 SPICSOFF ReadSTATUS SPI SPICSON SPIDATIO 0x02 0x5C 0xA5 SPICSOFF INCRWiper0 SPI SPICSON SPIDATIO 0x01 0x04 SPICSOFF DECRWiper0 SPI SPICSON SPIDATIO 0x01 0x08 SPICSOFF

MCP43XXEV Evaluation Board User’s Guide

2.5.2 Working With the PICkit Serial Analyzer

Figure 2-4 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 first 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 2-4: PICkit Serial Main Window at Startup.

Installation and Operation

We need to select the PICkit Serial Analyzer GUI to be in SPI Master mode. Figure 2-5 shows how to select the proper mode. Select PICkit Serial Analyzer -> Select Communications Mode -> SPI Master menu item (make sure the SPI Master item is checked).

FIGURE 2-5: PICkit Serial Selecting Communications Mode.

MCP43XXEV Evaluation Board User’s Guide

Now we need to configure the mode that we selected. Figure 2-6 shows how to configure the communications mode. Select PICkit Serial Analyzer -> Configure Communications Mode menu item. This will open a new window:

FIGURE 2-6: PICkit Serial Main Window at Startup.

Installation and Operation

Figure 2-7 shows the Configure Communications Mode window. Ensure that your window options and settings are the same as this window, and then select the “Save Changes” button. The “Configure Communications Mode” window may now be closed.

FIGURE 2-7: PICkit Serial Configure Communications Mode Window.

MCP43XXEV Evaluation Board User’s Guide

Now we are going to open the Script Builder window, select the Communications -> Script -> Script Builder menu item (see Figure 2-8).

FIGURE 2-8: PICkit Serial - Script Builder Menu Selection.

Installation and Operation

The Script Builder window is shown in Figure 2-9. In this window we see the User SPI Scripts including the ones that were added to the “CommScripts.txt “ file.

FIGURE 2-9: PICkit Serial Main Window at Startup.

MCP43XXEV Evaluation Board User’s Guide

Double clicking on the WriteWiper0 User SPI 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 a data byte and contains the Device Register Address, the Device Command, and the two Most Significant bits (MSb) of the write data. The third byte is the second data byte and contains the remaining 8 bits of the write data.

Number of Bytes that will be written

Data Byte #1 Data Byte #2 (Device Register Address + (Write Data “D7:D0”) Command + Data bit “D8”)

FIGURE 2-10: Example Write Script.

Installation and Operation

Double clicking on the ReadWiper0 User SPI Script will load the Script Details. Figure 2-11 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 a data byte and contains the Device Register Address, the Device Command, and the two Most Significant bits (MSb) of the read data. The third byte is the second data byte and contains the remaining 8 bits of the read data.

During read commands, the value of the two LSbs of Data Byte #1 and all of the bits of Data Byte #2 are not important. The bytes are required for the SPI clock generation.

Number of Bytes that will be written

Data Byte #1 (Device Register Address +

Command + Data bit “D8”)

FIGURE 2-11: Example Read Script.

Data Byte #2 (Write Data “D7:D0”)

MCP43XXEV Evaluation Board User’s Guide

2.6 MCP4361 DEMO STEPS

This demo assumes that you know how to configure the PICkit Serial Analyzer for Master SPI 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 MCP43XXEV board into the PICkit Serial.

3. Add the User Scripts (see Example 2-1) to the “CommScripts.TXT” file.

4. Start the PICkit Serial GUI.

5. Ensure the GUI is in Master SPI communication mode (see Figure 2-5).

6. Ensure that the Master SPI configuration is appropriately configured (see Figure 2-7).

7. Measure the Wiper 0 voltage on the MCP43XXEV board (see Figure 2-2) using an oscilloscope or digital multimeter. Measure voltage from the ground plane (GND) to the Wiper (P12). The voltage on the Wiper should be ~ V

8. Open the Script Builder window (see Figure 2-8).

9. Double click on the “WriteWiper0” script in the “Example SPI Scripts” column. This loads the Script Detail column (see Figure 2-10).

10. Click on the Execute Script button. This executes the script shown in the script detail column, which will update the Wiper value to 3Fh. The Wiper voltage will now be ~V updated to indicate the execution of the script.

1 1. Select the “ReadWiper0” script in the User SPI Scripts column. It should look like

Figure 2-11.

12. Click on the Execute Script button. This executes the script shown in the script detail column. The Transaction window (see Figure 2-14) will be updated to indicate the execution of the script. The Data read is shown in the last line.

13. Double click on the “WriteWiper0” script in the “Example SPI Scripts” column. This loads the Script Detail column and modifies the Wiper 0 data to 1FFh (see Figure 2-12).

14. Click on the Execute Script button. This executes the script shown in the script detail column, which will update the Wiper value to 1FFh. The Wiper voltage will now be ~V to indicat e the execution of the script.

15. Select the “ReadWiper0” script in the User SPI Scripts column. It should look like Figure 2-11.

16. Click on the Execute Script button. This executes the script shown in the script detail column. The Transaction window (see Figure 2-14) will be updated to indicate the execution of the script. The Data read is shown in the last line.

17. Double click on the “WriteTCON1” script in the “Example SPI Scripts” column. This loads the Script Detail column.

18. 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.

19. Select the “ReadTCON1” script in the User SPI Scripts column. It should look like Figure 2-13.

20. 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.

21. In the Transaction window, click the Clear button.

22. On the PICkit Serial Analyzer command bar, click the Reset button.

/4 (~1.25V). The Transaction window (see Figure 2-14) will be

(~5V). The Transaction window (see Figure 2-14) will be updated

/2 (~2.5V).

Installation and Operation

23. Select the “WriteWiper0” script in the User SPI Scripts column and then click on

the Execute Script button.

24. Select the “ReadWiper0” script in the User SPI Scripts column and then click on

the Execute Script button.

25. Select the “DECRWiper0” script in the User SPI Scripts column and then click on

the Execute Script button three times.

26. Select the “ReadWiper0” script in the User SPI Scripts column and then click on

the Execute Scr ipt button. The Transaction window shows the scripts that were executed and the current value of the Wiper 0 (see Figure 2-16).

27. In the Transaction window, click the Clear button.

28. On the PICkit Serial Analyzer command bar, click the Reset button.

29. Select the “WriteWiper0” script in the User SPI Scripts column and then click on

the Execute Script button.

30. Select the “ReadWiper0” script in the User SPI Scripts column and then click on

the Execute Script button.

31. Select the “INCRWiper0” script in the User SPI Scripts column and then click on

the Execute Script button three times.

32. Select the “ReadWiper0” script in the User SPI Scripts column and then click on

the Execute Scr ipt button. The Transaction window shows the scripts that were executed and the current value of the Wiper 0 (see Figure 2-17).

33. Y ou can repeat the sequence of writing values to the Wiper register, or by 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 prac tice to res et the PICkit Serial Anal yzer (PKSA). Th e PKSA can be reset using the “Reset” toolbar icon. Verify that subsequent script operations do not generate errors.

Write Command to Wiper 0 Register (D8 = ‘1’)

Wiper 0 Data (D7:D0 = ‘FFh’)

FIGURE 2-12: MCP43XX Write Wiper 0 Script File - Updating Wiper Value.

MCP43XXEV Evaluation Board User’s Guide

Number of Bytes that will be written

Data Byte #1 (Device Register Address +

Command + Data bit “D8”)

FIGURE 2-13: MCP43XX Read TCON1 Script.

9-bit data value (03Fh) written to Wiper 0 register

9-bit data value (1FFh) written to Wiper 0 register

Data Byte #2 (Write Data “D7:D0”)

9-bit data value (03Fh) read from Wiper 0 register

9-bit data value (1FFh) read from Wiper 0 register

FIGURE 2-14: MCP4361 Transaction Window - Wiper 0 Writes and Reads.

Installation and Operation

Data value read from TCON1 register

FIGURE 2-15: MCP4361 Transaction Window - TCON1 Writes and Reads.

Data value (03Fh) read from Wiper 0 register

Data value written to TCON1 register

Data value (03Ch) read from Wiper 0 register after 3 Decrement Commands

FIGURE 2-16: MCP4361 Transaction Window - Wiper 0 Decrements.

MCP43XXEV Evaluation Board User’s Guide

Data value (03Fh) read from Wiper 0 register

Data value (042h) read from Wiper 0 register after 3 Increment Commands

FIGURE 2-17: MCP4361 Transaction Window - Wiper 0 Increments.

2.6.1 The TSSOP20EV PCB and Supported Digital Potentiometers

Table 2-4 shows the current Digital Potentiometers that are supported by the TSSOP20EV PCB.

TABLE 2-4: TSSOP20EV PCB SUPPORTED DIGITAL POTENTIOMETERS

Device TSSOP-20 TSSOP-14 Comment

MCP4231 — Yes Dual Pot, SPI Interface MCP4241 — Yes Dual Pot, SPI Interface MCP4251 — Yes Dual Pot, SPI Interface MCP4261 — Yes Dual Pot, SPI Interface MCP4331 Yes — Quad Pot, SPI Interface MCP4341 Yes — Quad Pot, SPI Interface MCP4351 Yes — Quad Pot, SPI Interface MCP4361 Yes — Quad Pot, SPI Interface MCP4631 — Yes Dual Pot, I MCP4641 — Yes Dual Pot, I MCP4651 — Yes Dual Pot, I MCP4661 — Yes Dual Pot, I MCP42010 — Yes Dual Pot, SPI Interface MCP42050 — Yes Dual Pot, SPI Interface MCP42100 — Yes Dual Pot, SPI Interface

C Interface

MCP43XXEV EVALUATION BOARD

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the schematics and layouts for the MCP43XXEV Evaluation Board. Diagrams included in this appendix:

• Board – Schematic

• Board – Top Trace, Silk and Pads

• Board – Bottom Trace and Pads

• Board – Layer 2 Ground Plane

• Board – Layer 3 Power Plane

• Board Layout – Top Components

• Board – Bottom Silk, Trace and Pads

A.2 SCHEMATICS AND PCB LAYOUT

Board – Schematic shows the schematic of the MCP43XXEV Evaluation Board. The layer order is shown in Figure A-1.

USER’S GUIDE

FIGURE A-1: Layer Order.

Top Layer Ground Layer Power Layer Bottom Layer

MCP43XXEV Evaluation Board User’s Guide

A.3 BOARD – SCHEMATIC

A.4 BOARD – TOP TRACE, SILK AND PADS

Schematic and Layouts

MCP43XXEV Evaluation Board User’s Guide

A.5 BOARD – BOTTOM TRACE AND PADS

A.6 BOARD – LAYER 2 GROUND PLANE

Schematic and Layouts

MCP43XXEV Evaluation Board User’s Guide

A.7 BOARD – LAYER 3 POWER PLA N E

A.8 BOARD LAYOUT – TOP COMPONENTS

Schematic and Layouts

MCP43XXEV Evaluation Board User’s Guide

A.9 BOARD – BOTTOM SILK, TRACE AND PADS

MCP43XXEV EVALUATION BOARD

USER’S GUIDE

Appendix B. Bill of Materials (BOM)

TABLE B-1: BILL OF MATERIALS

Qty Reference Description Manufacturer Part Number

1PCB Note 1 Microchip T ech nology

Inc.

8 R1U, R3D, R7D

R8D, R10U, R17U

R15U, R14U 2 R14U, R15U RES 10.0K OHM 1/8W 1% 0805 SMD Panasonic - ECG ERJ-6ENF1002V 1 U3 MCP4361 Quad SPI Digi-Pot (10K Ohm

4 P2, P9, P12, P19 TEST POINT PC MULTI PURPOSE ORG Keystone

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

Note 1: This assembly uses RoHS Compliant TSSOP-20 to DIP-20 Evaluation Board.

2: The components listed in this Bill of Ma terials are re pre sentat ive o f th e PCB as sembl y. The released BOM

used in manufacturing uses all RoHS-compliant components.

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

Microchip T ech nology

version )

Inc.

Electronics

Electronics Corp.

- ECG ERJ-6GEY0R00V

104-00272

MCP4361-103E/ST

5013

22-28-8062

WORLDWIDE SALES AND SERVICE

AMERICAS

Corporate Office

2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: http://support.microchip.com Web Address: www.microchip.com

Atlanta

Duluth, GA Tel: 678-957-9614 Fax: 678-957-1455

Boston

Westborough, MA Tel: 774-760-0087 Fax: 774-760-0088

Chicago

Itasca, IL Tel: 630-285-0071 Fax: 630-285-0075

Cleveland

Independence, OH Tel: 216-447-0464 Fax: 216-447-0643

Dallas

Addison, TX Tel: 972-818-7423 Fax: 972-818-2924

Detroit

Farmington Hills, MI Tel: 248-538-2250 Fax: 248-538-2260

Kokomo

Kokomo, IN Tel: 765-864-8360 Fax: 765-864-8387

Los Angeles

Mission Viejo, CA Tel: 949-462-9523 Fax: 949-462-9608

Santa Clara

Santa Clara, CA Tel: 408-961-6444 Fax: 408-961-6445

Toronto

Mississauga, Ontario, Canada Tel: 905-673-0699 Fax: 905-673-6509

ASIA/PACIFIC

Asia Pacific Office

Suites 3707-14, 37th Floor Tower 6, The Gateway Harbour City, Kowloon Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431

Australia - Sydney

Tel: 61-2-9868-6733 Fax: 61-2-9868-6755

China - Beijing

Tel: 86-10-8528-2100 Fax: 86-10-8528-2104

China - Chengdu

Tel: 86-28-8665-5511 Fax: 86-28-8665-7889

China - Chongqing

Tel: 86-23-8980-9588 Fax: 86-23-8980-9500

China - Hong Kong SAR

Tel: 852-2401-1200 Fax: 852-2401-3431

China - Nanjing

Tel: 86-25-8473-2460 Fax: 86-25-8473-2470

China - Qingdao

Tel: 86-532-8502-7355 Fax: 86-532-8502-7205

China - Shanghai

Tel: 86-21-5407-5533 Fax: 86-21-5407-5066

China - Shenyang

Tel: 86-24-2334-2829 Fax: 86-24-2334-2393

China - Shenzhen

Tel: 86-755-8203-2660 Fax: 86-755-8203-1760

China - Wuhan

Tel: 86-27-5980-5300 Fax: 86-27-5980-5118

China - Xian

Tel: 86-29-8833-7252 Fax: 86-29-8833-7256

China - Xiamen

Tel: 86-592-2388138 Fax: 86-592-2388130

China - Zhuhai

Tel: 86-756-3210040 Fax: 86-756-3210049

ASIA/PACIFIC

India - Bangalore

Tel: 91-80-3090-4444 Fax: 91-80-3090-4123

India - New Delhi

Tel: 91-11-4160-8631 Fax: 91-11-4160-8632

India - Pune

Tel: 91-20-2566-1512 Fax: 91-20-2566-1513

Japan - Yokohama

Tel: 81-45-471- 6166 Fax: 81-45-471-6122

Korea - Daegu

Tel: 82-53-744-4301 Fax: 82-53-744-4302

Korea - Seoul

Tel: 82-2-554-7200 Fax: 82-2-558-5932 or 82-2-558-5934

Malaysia - Kuala Lumpur

Tel: 60-3-6201-9857 Fax: 60-3-6201-9859

Malaysia - Penang

Tel: 60-4-227-8870 Fax: 60-4-227-4068

Philippines - Manila

Tel: 63-2-634-9065 Fax: 63-2-634-9069

Singapore

Tel: 65-6334-8870 Fax: 65-6334-8850

Tai wan - Hsin Chu

Tel: 886-3-6578-300 Fax: 886-3-6578-370

Taiwan - Kaohsiung

Tel: 886-7-213-7830 Fax: 886-7-330-9305

Taiwan - Taipei

Tel: 886-2-2500-6610 Fax: 886-2-2508-0102

Thailand - Bangkok

Tel: 66-2-694-1351 Fax: 66-2-694-1350

EUROPE

Austria - Wels

Tel: 43-7242-2244-39 Fax: 43-7242-2244-393

Denmark - Copenhagen

Tel: 45-4450-2828 Fax: 45-4485-2829

France - Paris

Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79

Germany - Munich

Tel: 49-89-627-144-0 Fax: 49-89-627-144-44

Italy - Milan

Tel: 39-0331-742611 Fax: 39-0331-466781

Netherlands - Drunen

Tel: 31-416-690399 Fax: 31-416-690340

Spain - Madrid

Tel: 34-91-708-08-90 Fax: 34-91-708-08-91

UK - Wokingham

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

07/15/10

Microchip Technology MCP43XXEV Evaluation Board User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Trademarks

Preface

Chapter 1. Product Overview

1.1 INTRODUCTION

1.2 WHAT IS THE MCP43XXEV EVALUATION BOARD?

1.3 WHAT THE MCP43XXEV EVALUATION BOARD KIT INCLUDES

Chapter 2. Installation and Operation

2.1 INTRODUCTION

2.2 FEATURES

2.3 GETTING STARTED

2.4 MCP43XXEV EVALUATION BOARD DESCRIPTION

2.4.1 The Hardware

2.4.2 The MCP4361 Device

2.5 CONFIGURING THE PICKIT SERIAL ANALYZER

2.5.1 Modifying the “CommScripts.txt” file

2.5.2 Working With the PICkit Serial Analyzer

2.6 MCP4361 DEMO STEPS

2.6.1 The TSSOP20EV PCB and Supported Digital Potentiometers

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

A.2 SCHEMATICS AND PCB LAYOUT

A.3 BOARD – SCHEMATIC

A.4 BOARD – TOP TRACE, SILK AND PADS

A.5 BOARD – BOTTOM TRACE AND PADS

A.6 BOARD – LAYER 2 GROUND PLANE

A.7 BOARD – LAYER 3 POWER PLA N E

A.8 BOARD LAYOUT – TOP COMPONENTS

A.9 BOARD – BOTTOM SILK, TRACE AND PADS

Appendix B. Bill of Materials (BOM)

WORLDWIDE SALES AND SERVICE

Corporate Office

Atlanta

Boston

Chicago

Cleveland

Dallas

Detroit

Kokomo

Toronto

Australia - Sydney

China - Beijing

China - Shanghai

India - Bangalore

Korea - Daegu

Korea - Seoul

Singapore

Taiwan - Taipei

Denmark - Copenhagen

France - Paris

Germany - Munich

Italy - Milan

Spain - Madrid

UK - Wokingham