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MCP46XX

PICtail™ Plus

Daughter Board

User’s Guide

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and may be superseded by updates.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, Accuron,

dsPIC, KEE EELOQ, K LOQ logo, MPLAB, PIC, PICmicro,

PICSTART, rfPIC, SmartShunt and UNI/O are registered

trademarks of Microchip Technology Incorporated in the

U.S.A. and other countries.

FilterLab, Linear Active Thermistor, MXDEV, MXLAB,

SEEVAL, SmartSensor 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, In-Circuit Serial

Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB

Certified logo, MPLIB, MPLINK, mTouch, nanoWatt XLP,

PICkit, PICDEM, PICDEM.net, PICtail, PIC

32 logo, PowerCal,

PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, Select

Mode, Total Endurance, TSHARC, 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.

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.

Microchip received ISO/TS-16949:2002 certification for its worldwide

headquarters, design and wafer fabrication facilities in Chandler and

Tempe, Arizona; Gresham, Oregon and design centers in California

and India. The Company’s quality system processes and procedures

are for its PIC® MCUs and dsPIC® DSCs, KEELOQ®

code hopping

devices, Serial EEPROMs, microperipherals, nonvolatile memory and

analog products. In addition, Microchip’s quality system for the design

and manufacture of development systems is ISO 9001:2000 certified.

MCP46XX 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 MCP46XX PICtail™ Plus Daughter Board? ................................ 6

1.3 What the MCP46XX 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 MCP46XX PICtail™ Plus Daughter Board Demos ....................................... 14

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 Silk-Screen Layer .................................................................... 29

A.5 Board – Top Components and Silk-Screen .............................................. 30

A.6 Board – Ground Layer ................................................................................. 31

A.7 Board – Power Layer ................................................................................... 32

A.8 Board – Bottom Layer .............................................................................. 33

Appendix B. Bill Of Materials (BOM)

B.1 Bill Of Materials (BOM) ................................................................................ 35

Appendix C. Board Testing

C.1 Introduction .................................................................................................. 37

C.2 What is Tested ............................................................................................. 38

C.3 What is Not Tested ...................................................................................... 38

Worldwide Sales and Service .................................................................................... 40

MCP46XX PICtail™ Plus Daughter Board User’s Guide

NOTES:

MCP46XX PICTAIL™ PLUS

DAUGHTER BOARD USER’S GUIDE

Preface

INTRODUCTION

This chapter contains general information that will be useful to know before using the

MCP46XX PICtail™ Plus Daughter Board. Items discussed in this chapter include:

• Document Layout

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Web Site

• Customer Support

• Document Revision History

DOCUMENT LAYOUT

This document describes how to use the MCP46XX PICtail™ Plus Daughter 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 MCP46XX

PICtail™ Plus Daughter Board.

•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 MCP46XX PICtail™ Plus Daughter Board.

•Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the

MCP46XX PICtail™ Plus Daughter Board.

•Appendix C. “Board Testing” – Describes the testing method for the MCP46XX

PICtail™ Plus Daughter Board and which aspects of the board are tested and

which are not.

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® IDE on-line help.

Select the Help menu, and then Topics to open a list of available on-line help files.

MCP46XX 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

“Save project before build”

Underlined, italic text with

right angle bracket

A menu path File>Save

Bold characters A dialog button Click OK

A tab Click the Power tab

N‘Rnnnn A number in verilog format,

where N is the total number of

digits, R is the radix and n is a

digit.

4‘b0010, 2‘hF1

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Filenames autoexec.bat

File paths c:\mcc18\h

Keywords _asm, _endasm, static

Command-line options -Opa+, -Opa-

Bit values 0, 1

Constants 0xFF, ‘A’

Italic Courier New A variable argument file.o, where file can be

any valid filename

Square brackets [ ] Optional arguments mcc18 [options] file

[options]

Curly brackets and pipe

character: { | }

Choice of mutually exclusive

arguments; an OR selection

errorlevel {0|1}

Ellipses... Replaces repeated text var_name [,

var_name...]

Represents code supplied by

user

void main (void)

{ ...

}

Preface

RECOMMENDED READING

This user's guide describes how to use the MCP46XX PICtail™ Plus Daughter Board.

Other useful documents are listed below. The following Microchip documents are

available and recommended as supplemental reference resources.

AN1080 Application Note, “Understanding Digital Potentiometer Resistor

Variations”, DS01080

These data sheets provide detailed information regarding the MCP41XX/42XX product

family:

MCP453x/455x/463x/465x Data Sheet, “7/8-Bit Single/Dual I2C Digital POT with

Non-Volatile Memory“, DS22107

MCP454x/456x/464x/466x Data Sheet, “7/8-Bit Single/Dual I2C Digital POT with

Volatile Memory“, DS22096

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

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. Local 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 (April 2009)

• Initial Release of this Document.

MCP46XX PICtail™ Plus Daughter Board User’s Guide

NOTES:

MCP46XX PICTAIL™ PLUS

DAUGHTER BOARD USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

The MCP46XX PICtail™ Plus demonstrates the features and abilities Daughter Board

of Microchip’s MCP45XX and MCP46XX Digital Potentiometers. This board is

designed to exclusively use the MCP46XX devices.

The MCP45XX and MCP46XX are digital potentiometers with an I2C 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:

• Explorer 16 Development Board (DM240001)

• PICkit™ Serial Analyzer (DV164122)

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

The use of the Explorer 16 Development 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.

This chapter covers the following topics:

• What is the MCP46XX PICtail™ Plus Daughter Board?

• What the MCP46XX PICtail™ Plus Daughter Board Kit includes.

MCP46XX PICtail™ Plus Daughter Board User’s Guide

1.2 WHAT IS THE MCP46XX PICTAIL™ PLUS DAUGHTER BOARD?

The MCP46XX PICtail™ Plus Daughter Board is used to demonstrate the use of digital

potentiometers. This board is designed to be used in conjunction with either the

Explorer 16 Development Board or the PICkit™ Serial Analyzer. Figure 1-1 shows the

board’s components 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

MCP4661 uses an I2C 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 HVC voltages can be taken to a VIHH level

for high voltage commands. This is done by controlling the selection of the analog

switch device (U1).

Jumpers allow the Terminal A and Terminal B voltages to be tied to AVDD and VSS, or

come from an external source.

FIGURE 1-1: MCP46XX Explorer 16 Daughter Board Demo Board Connectors.

PICkit Serial

Analyzer

Interface (I2C)

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

AVSS or VB0

Selects source

of Terminal A1

Voltage. Either

AVDD or VA1

Selects source

of Terminal B1

Voltage. Either

AVSS or VB1

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 HVC voltage to be selected as

one of four voltages (VSS, 3.3V, 5.0V, or 9.0V) - High Voltage command support

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

Channels

• Jumper (JP1) to allow AVDD to be driven by external power supply while

connected to the PICDEM board or the PICkit Serial Analyzer

• Jumpers to allow Terminal A pins to be connected to the AVDD or VAx pad

• Jumpers to allow Terminal B pins to be connected to the VSS or VBx pad

• Connection point for easy connection to the Resistor Network Terminal pins

1.3 WHAT THE MCP46XX PICTAIL™ PLUS DAUGHTER BOARD KIT INCLUDES

This MCP46XX PICtail™ Plus Daughter Board Kit includes:

• One MCP46XX PICtail™ Plus Daughter Board, 102-00182

• Important Information “Read First”

MCP46XX PICtail™ Plus Daughter Board User’s Guide

NOTES:

MCP46XX PICTAIL™ PLUS

DAUGHTER BOARD USER’S GUIDE

Chapter 2. Installation and Operation

2.1 INTRODUCTION

The MCP46XX PICtail™ Plus Daughter Board is used to demonstrate the operation of

digital potentiometers. The operation of the MCP45XX devices is similar to the

MCP46XX devices. Therefore, the MCP46XX PICtail™ Plus Daughter Board can be

used as a development platform for either device family.

The MCP46XX PICtail™ Plus Daughter Board is designed to be used in conjunction

with either the Explorer 16 Development Board or the PICkit™ Serial Analyzer.

2.2 FEATURES

The MCP46XX PICtail™ Plus Daughter Board supports the following features:

• Each digital potentiometer’s Terminal A pin can be individually connected to either

AVDD or the corresponding VAx pad

• Each digital potentiometer’s Terminal B pin can be individually connected to either

AVSS or the corresponding VBx pad

• It can control the voltage on the MCP4661’s HVC/A0 pin to either VSS, 3.3V, 5.0V,

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

• It can control the MCP4661 via the PICkit™ Serial Analyzer interface (J2)

• PIC24 can monitor the voltage levels of the MCP4661’s W0 and W1 pins

• It is supplied with a “C” program that demonstrates normal and high voltage

commands

• It demonstrates a split rail application, with digital logic at 3.3V and analog

operation at 5.0V

MCP46XX PICtail™ Plus Daughter Board User’s Guide

2.3 GETTING STARTED

Figure 2-1 shows a simplified circuit for the MCP46XX PICtail™ Plus Daughter Board.

The layout of the board is shown in Figure 2-3. This board can be operated with either

a PICDEM board with a PICtail Plus header or the PICkit Serial Analyzer. The

MCP46XX PICtail™ Plus Daughter Board kit comes with firmware for the Explorer 16

Starter Kit (DV164033). The layout of this board is shown in Figure 2-5.

The MCP46XX PICtail™ Plus Daughter Board supports the following Microchip Digital

Potentiometer devices, which allows demonstration of all MCP46XX devices. The

board has the footprint for the following devices:

• MCP46X1

FIGURE 2-1: MCP46XX PICtail™ Plus Daughter Board Simplified Circuit.

PICVDD

RAB0 RAB1

CS0

SDI

SDO

AVDD

JMP3

VA1

AVDD

Pin # SPI Name I2C Name

SCK

SDI

VSS

P1B

P1W

P1A

P0A

P0W

P0B

SHDN

SDO

VDD

HVC/A0

SCL

SDA

VSS

P1B

P1W

P1A

P0A

P0W

P0B

VDD

Pin # SPI Name I2C Name

SDO

SCK

SDI

VSS

VDD

—

SCL

SDA

VSS

VDD

—

PICkit Serial 6-Pin Interface

VSS VSS

AVDD VSS

SCK

SHDN

R3 R4 R5 R6 R7

RB2 (CS0)

SDI

SDO

RF0 (WP)

RF1 (SHDN)

JMP4

VB1

VSS

VW1

JMP1

VA0

AVDD

JMP2

VB0

VSS

VW0

H1 (PICkit Serial Interface)

VDD

VSS

SDI2

SCK2

SDO2

PIC

Explorer 16

Interface

JP1

MCP4661

(TSSOP)

SCK

RB0/AN0

RB1/AN1

VW0

JP2

VW1

JP3

SDA2

RF2

RF3

SCL1

SDA1

VSS

AN1

RB4/AN4

VSS

RE8

RD15

+3.3V

+5.0V

+9.0V

RF0

RF1

RF4

RF5

SCL2

SDA2

RB2

SCK1

SDI1

SDO1

VSS

AN0

RB3/AN3

VSS

RE9

RD14

+3.3V

+5.0V

+9.0V

RG0

RG1

RG9

SCK2

SDI2

SDO2

Connector

Orientation

Notch

1 2

+5.0V

+3.3V

+9.0V

VSS

CS0

RD15

RD14

VDD +9.0V

VSS

RB2

VSS VSS

VSS

(+5.0V)

MAX4582L

H2 (PICkit Serial Interface)

VDD

VSS

SDA

SCL

SCL2

(To SDI)

(To SDO)

(To SCK)

Installation and Operation

2.3.1 The Hardware

Figure 2-2 shows the component placement of the MCP46XX 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 AVDD pad allows an external power supply to power the board, which should

improve performance compared to powering the board 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 I2C

device families (MCP42XX and MCP46XX), so not all components are installed to

support the operation of the SPI version of the MCP46XX PICtail™ Plus Daughter

Board.

2.3.1.1 JUMPER DESCRIPTIONS

Figure 2-2 shows the function of the MCP46XX PICtail™ Plus Daughter Board

jumpers. Some of the jumpers configure 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 conflicts do not occur if an external power supply is being

used for the AVDD voltage.

The default jumper configuration for the shipped MCP46XX PICtail™ Plus Daughter

Board is shown in Figure 2-3.

MCP46XX PICtail™ Plus Daughter Board User’s Guide

FIGURE 2-2: MCP46XXDM-PTPLS Jumper Configuration and Oscilloscope Test Points.

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

MCP46XXDM-PTPLS AVDD plane

Installation and Operation

FIGURE 2-3: MCP46XX PICtail™ Plus Daughter Board Layout with Default Jumper Settings

2.3.2 The Firmware

The supplied PIC24FJ128A010 firmware is written in 'C' for the Microchip 'C' Compiler.

The program is written using Microchip's released I2C library routines.

There are two program modes of operation, determined by the state of the S3 switches

after a device reset. Program one will generate a saw wave on Wiper 1 pin (VW1), while

program two will allow the user to control the value of the Wiper 1 register with the S4

and S6 switches. If it is desired to save that setting, the S5 switch can be depressed to

copy the value in the Volatile Wiper 1 register to the Non-Volatile Wiper 1 register. So

on any POR/BOR event the volatile Wiper 1 register will be loaded with the value of the

non-volatile Wiper 1 register.

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

MCP46XX PICtail™ Plus Daughter Board User’s Guide

2.4 MCP46XX PICTAIL™ PLUS DAUGHTER BOARD DEMOS

This section describes how to demonstrate the MCP46XX PICtail™ Plus Daughter

Board. The demos will either use an Explorer 16 Development Board or a PICkit Serial

Analyzer.

The demo using the Explorer 16 Development Board is discussed in

Section 2.4.1 “Demos with the Explorer 16 Development Board”, while the demo

using the PICkit Serial Analyzer is discussed in Section 2.4.2 “Demo with the PICkit

Serial Analyzer”.

2.4.1 Demos with the Explorer 16 Development Board

This demo will use the Explorer 16 Development Board. This board needs to be

programmed with the supplied firmware. This firmware can be downloaded from the

Microchip web site. It is a good practice to check the Microchip 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 Voltage commands to Wiper 1 (see Figure 2-7). This is

where the CS signal is driven to 9V.

The program selected is determined after a reset (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.

TABLE 2-1: DEMO HARDWARE REQUIREMENTS

Note: Both demos require that the MCP46XXDM-PTPLS board jumper settings

are as shown in Figure 2-4.

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.

Item # Description Comment

1 Explorer 16 Development Board and power supply

(DV164033)

Note 1

2 MCP46XXDM-PTPLS —

3 4-Channel oscilloscope Note 2

Note 1: A development tool to program the Explorer 16 Development 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

oscilloscope is the minimum requirement, but it is not recommended.

Installation and Operation

2.4.1.1 THE MCP46XXDM-PTPS JUMPER CONFIGURATION

Before inserting the board into the Explorer 16 Development Board, the jumper

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

FIGURE 2-4: MCP46XXDM-PTPLS Jumper Configuration and Oscilloscope Test Points.

Channel 4

Channel 3

Channel 2

Channel 1

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

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	mcp4642

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