Microchip Technology MCP9800 User manual

©2008 Microchip Technology Inc. DS51758A
MCP9800
Temperature Sensor
Demo Board
User’s Guide

DS51758A-page ii ©2008 Microchip Technology Inc.
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and may be superseded by updates.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, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
PICSTART, rfPIC and SmartShunt 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, PICkit, PICDEM,
PICDEM.net, PICtail, PIC32 logo, PowerCal, PowerInfo,
PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total
Endurance, UNI/O, WiperLock and ZENA are trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
SQTPisaservicemark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2008, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
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.

MCP9800 TEMPERATURE SENSOR
DEMO BOARD USER’S GUIDE
©2008 Microchip Technology Inc. DS51757A-page iii
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 MCP9800 Temperature Sensor Demo Board? ...........................5
1.3 What the MCP9800 Temperature Sensor Demo Board Kit includes .............5
Chapter 2. Installation and Operation
2.1 Introduction .....................................................................................................7
2.2 Features .........................................................................................................7
2.3 Getting Started ............................................................................................... 8
2.4 Functional description ....................................................................................9
Appendix A. Schematic and Layouts
A.1 oduction ....................................................................................................... 13
A.2 Board Schematic ........................................................................................14
A.3 Board - Top Layer ...................................................................................... 15
A.4 Board - Top Silk-screen Layer ................................................................... 15
A.5 Board - Bottom Layer ................................................................................. 16
Appendix B. Bill Of Materials (BOM)
Worldwide Sales and Service ....................................................................................20

MCP9800 Temperature Sensor Demo Board User’s Guide
DS51757A-page iv ©2008 Microchip Technology Inc.
NOTES:

MCP9800 TEMPERATURE SENSOR
DEMO BOARD USER’S GUIDE
©2008 Microchip Technology Inc. DS51758A-page 1
Preface
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP9800 Temperature Sensor Demo 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 MCP9800 Temperature Sensor Demo 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 MCP9800
Temperature Sensor Demo Board.
•Chapter 2. “Installation and Operation” – This chapter includes a detailed
description of each function of the demo board and instructions for how to begin
using the board.
•Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the MCP9800 Temperature Sensor Demo Board.
•Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the
MCP9800 Temperature Sensor Demo Board.
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.

MCP9800 Temperature Sensor Demo Board User’s Guide
DS51758A-page 2 ©2008 Microchip Technology Inc.
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
©2008 Microchip Technology Inc. DS51758A-page 3
RECOMMENDED READING
This user's guide describes how to use MCP9800 Temperature Sensor Demo Board.
Other useful documents are listed below. The following Microchip documents are avail-
able and recommended as supplemental reference resources.
MCP9800/1/2/3 Data Sheet, “2-Wire High-Accuracy Temperature Sensor“,
DS21909
This data sheet provides detailed information regarding the MCP9800 device.
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 (August 2008)
• Initial Release of this Document.

MCP9800 Temperature Sensor Demo Board User’s Guide
DS51758A-page 4 ©2008 Microchip Technology Inc.
NOTES:

MCP9800 TEMPERATURE SENSOR
DEMO BOARD USER’S GUIDE
©2008 Microchip Technology Inc. DS51758A-page 5
Chapter 1. Product Overview
1.1 INTRODUCTION
This chapter provides an overview of the MCP9800 Temperature Sensor Demo Board
and covers the following topics:
• What is the MCP9800 Temperature Sensor Demo Board?
• What the MCP9800 Temperature Sensor Demo Board kit includes
1.2 WHAT IS THE MCP9800 TEMPERATURE SENSOR DEMO BOARD?
The MCP9800 Temperature Sensor Demo Board demonstrates the sensor’s features.
Userscan connect the demo board to aPC withUSBinterfaceandevaluatethesensor
performance.The 7-SegmentLED displays temperatureindegreesCelsius ordegrees
Fahrenheit; the temperature alert feature can be set by the users using an on board
potentiometer. An alert LED is used to indicate an over temperature condition.
In addition, temperature can be datalogged using the Microchip Thermal Management
Software Graphical User Interface (GUI). The sensor registers can also be
programmed using the GUI.
1.3 WHAT THE MCP9800 TEMPERATURE SENSOR DEMO BOARD KIT
INCLUDES
This MCP9800 Temperature Sensor Demo Board Kit includes:
• MCP9800 Temperature Sensor Demo Board (102-0170)
• Microchip Thermal Management Graphical User Interface (GUI)
• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)
- MCP9800 Temperature Sensor Demo Board User’s Guide (DS51758)
- MCP9800/1/2/3 Data Sheet, “2-Wire High-Accuracy Temperature Sensor“,
(DS21909)

MCP9800 Temperature Sensor Demo Board User’s Guide
DS51758A-page 6 ©2008 Microchip Technology Inc.
NOTES:

MCP9800 TEMPERATURE SENSOR
DEMO BOARD USER’S GUIDE
©2008 Microchip Technology Inc. DS51758A-page 7
Chapter 2. Installation and Operation
2.1 INTRODUCTION
The MCP9800 Temperature Sensor Demo Board demonstrates the sensor functions
and features. This demo board is powered from a USB port and it displays temperature
on a 7-Segment LED display. A push button switch is used to display temperature in
degrees F or degrees C. In addition, the sensor overtemperature alert feature can be
evaluated by the user using a rotary potentiometer. The temperature Alert and Hyster-
esis registers are programmed to a preset temperature limit based on the potentiome-
ter wiper position. An LED is used to indicate overtemperature condition.
In addition, temperature canbe data logged using the Microchip Thermal Management
Software Graphical User Interface (GUI). The sensor registers can also be
programmed using the GUI.
2.2 FEATURES
The MCP9800 Temperature Sensor Demo Board has the following features:
• Graphical User Interface which can be used for temperature data logging
• Small PCB layout
• Standard 100 mil 14-pin header (P1) for easy interface to PICkit™ 1 Flash Starter
Kit or custom application
• 7-segment LED display to display temperature in °C or in °F
• Temperature Alert Programability
• Temperature Alert indicating LED

MCP9800 Temperature Sensor Demo Board User’s Guide
DS51758A-page 8 ©2008 Microchip Technology Inc.
2.3 GETTING STARTED
This section describes how to quickly configure the MCP9800 Temperature Sensor
Demo Board and PICkit™ 1 Flash Starter Kit. A block diagram of the configuration is
provided in Figure 2-1.
.
FIGURE 2-1: MCP9800 Temperature Sensor Demo Board Block Diagram.
2.3.1 Hardware Setup
1. The MCP9800 Temperature Sensor Demo Board has a mini-USB connector for
a PC interface. Connect the USB cable from the demo board to a PC.
Temperature should be displayed on the 7-Segment LED display.
2. Start the Thermal Management Software GUI for data logging or to evaluate the
sensor features.
I2C Interface
PC USB interface
MCP9800
7-Segment display
PIC18F2550
Display Control-
ler
I2C Interface
Alert Indicator
User Input:
Temperature
Alert/Hystere-
sis Limit Set
°C / °F

Installation and Operation
©2008 Microchip Technology Inc. DS51758A-page 9
2.4 FUNCTIONAL DESCRIPTION
2.4.1 The MCP9800 Temperature Sensor Demo Board
The MCP9800 Temperature Sensor Demo Board has the MCP9800 temperature
sensor device, a 7-segment LED display circuit, and a PIC18F2550 Microcontroller
which controls the sensor andPC interface via USB. The controller communicates with
the sensor and displays the temperature on the 7-segment LED display. The PIC also
monitors user inputs via a push button switch and a potentiometer, and controls the
sensor and the 7-segment display accordingly. In addition, the PIC supports a full
speed USB protocol which is used to interface with a PC and provide additional user
interface to access all sensor features, such as temperature measurement resolution,
measurement queue, shutdown/oneshot mode, and temperature alert output polarity.
The software can also be used to data log temperature data.
2.4.2 The MCP9800
The MCP9800 comes with user-programmable registers that provide flexibility for tem-
perature sensing applications. The register settings allow user selectable 9-bit to 12-bit
temperaturemeasurementresolution,configurationofthepower-savingShutdown and
One-shot (single conversion on command while in the Shutdown) modes and the
specification of both temperature alert output and hysteresis limits. When the temper-
aturechangesbeyondthespecifiedlimits,theMCP9800device outputsanalertsignal.
The user has the option of setting the alert output signal polarity as an active-low or
active-high comparator output for thermostat operation, or as temperature event
interrupt output for microprocessor-based systems.
This device has I2C/SMBus compatible serial interface (refer to the MCP9800/1/2/3
Data Sheet, DS21909, for further details).
2.4.3 User Selectable Features
Thedemo firmwareprogramsthetemperaturelimitandhysteresis limitregisters(TSET
and THYST) according to the position of the RP1 potentiometer. The potentiometer is
connected to the PIC18F2550 analog input pin. The voltage across the potentiometer
wiper terminal determines the TSET limit and THYST register settings. Table 2-1 shows
RP1 wiper voltage and the corresponding TSET limit with 5°C hysteresis.
When the ambient temperature exceeds the programmed TSET limit, the MCP9800
outputs an Alert signal using the ALERT output pin. This pin is an open-drainoutput pin
which is configured as an active-high output. When this pin is high, the D1 diode lits up,
and it remains lit up until the temperature drifts beyond the hysteresis limit, THYST.
This firmware also converts the degree Celsius to degree Fahrenheit using the SW1
switch. When user presses the momentary push-button switch, the 7-segment display
shows the ambient temperature in degree Fahrenheit/Celsius.
In addition, the user has the option of changing the MCP9800 temperature
measurement resolution (default resolution is 12-bit). However, this requires the GUI.

MCP9800 Temperature Sensor Demo Board User’s Guide
DS51758A-page 10 ©2008 Microchip Technology Inc.
TABLE 2-1: POTENTIOMETER WIPER POSITION AND TSET SETTING
VR1 Position TSET (°C) THyst (°C)
VDD/15 10 9
VDD/14 13 12
VDD/13 16 15
VDD/12 19 18
VDD/11 22 21
VDD/10 25 24
VDD/9 28 27
VDD/8 31 30
VDD/7 34 33
VDD/6 37 36
VDD/5 40 39
VDD/4 43 42
VDD/3 46 45
VDD/2 49 48
VDD/1 52 51
VDD 55 54

Installation and Operation
©2008 Microchip Technology Inc. DS51758A-page 11
2.4.4 Microchip Thermal Management GUI
The Microchip Thermal Management Graphical User Interface is an easy to use
software tool which allows the users to evaluate the demo board and sensor features,
as displayed in Figure 2-2.
FIGURE 2-2: Microchip Thermal Management GUI.
Once the hardware is connected, the software recognizes the device ID and displays
the corresponding GUI for the demo board. This tool enables the user to evaluate the
sensor’s features and perform temperature datalog. The black “Play”, “Stop”, and
“Reset” icons can be used to perform continuous datalog. And the red “Record” icon
enables the user to datalog to an external file. The logging interval can be adjusted
using the Interval Scroll bar from 100 ms to 1000 ms.
The Real-time Data Acquisition charting tool can be customized by double clicking the
chart, as shown in Figure 2-3. Additional options are available by right clicking the
chart. Users can also zoom into a specific plot range by clicking and dragging the
section.
FIGURE 2-3: Chart Setup Options.

MCP9800 Temperature Sensor Demo Board User’s Guide
DS51758A-page 12 ©2008 Microchip Technology Inc.
NOTES:

MCP9800 TEMPERATURE SENSOR
DEMO BOARD USER’S GUIDE
©2008 Microchip Technology Inc. DS51758A-page 13
Appendix A. Schematic and Layouts
A.1 INTRODUCTION
This appendix contains the following schematics and layouts for the MCP9800
Temperature Sensor Demo Board:
• Board Schematic
• Board - Top Layer
• Board - Top Silk-screen Layer
• Board - Bottom Layer

MCP9800 Temperature Sensor Demo Board User’s Guide
DS51758A-page 14 ©2008 Microchip Technology Inc.
A.2 BOARD SCHEMATIC
M

Schematic and Layouts
©2008 Microchip Technology Inc. DS51758A-page 15
A.3 BOARD - TOP LAYER
A.4 BOARD - TOP SILK-SCREEN LAYER
102-00170
BOARD EDGE
102-00170
BOARD EDGE

MCP9800 Temperature Sensor Demo Board User’s Guide
DS51758A-page 16 ©2008 Microchip Technology Inc.
A.5 BOARD - BOTTOM LAYER
104-00170-R1