MCP9800
Temperature Sensor
Demo Board
User’s Guide
© 2008 Microchip Technology Inc.
DS51758A
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DS51758A-page ii
© 2008 Microchip Technology Inc.
MCP9800 TEMPERATURE SENSOR
DEMO 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 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
© 2008 Microchip Technology Inc.
DS51757A-page iii
MCP9800 Temperature Sensor Demo Board User’s Guide
NOTES:
DS51757A-page iv
© 2008 Microchip Technology Inc.
MCP9800 TEMPERATURE SENSOR
DEMO 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® IDE on-line help.
Select the Help menu, and then Topics to open a list of available on-line help files.
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.
© 2008 Microchip Technology Inc.
DS51758A-page 1
MCP9800 Temperature Sensor Demo Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Represents
Referenced books
Emphasized text
A window
A dialog
A menu selection
A field name in a window or
dialog
A menu path
MPLAB® IDE User’s Guide
...is the only compiler...
the Output window
the Settings dialog
select Enable Programmer
“Save project before build”
A dialog button
A tab
A number in verilog format,
where N is the total number of
digits, R is the radix and n is a
digit.
A key on the keyboard
Click OK
Click the Power tab
4‘b0010, 2‘hF1
Italic Courier New
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
Constants
A variable argument
Square brackets [ ]
Optional arguments
Curly brackets and pipe
character: { | }
Ellipses...
Choice of mutually exclusive
arguments; an OR selection
Replaces repeated text
#define START
autoexec.bat
c:\mcc18\h
_asm, _endasm, static
-Opa+, -Opa0, 1
0xFF, ‘A’
file.o, where file can be
any valid filename
mcc18 [options] file
[options]
errorlevel {0|1}
Initial caps
Quotes
Underlined, italic text with
right angle bracket
Bold characters
N‘Rnnnn
Text in angle brackets < >
Courier New font:
Plain Courier New
Represents code supplied by
user
DS51758A-page 2
Examples
File>Save
Press <Enter>, <F1>
var_name [,
var_name...]
void main (void)
{ ...
}
© 2008 Microchip Technology Inc.
Preface
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 available 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.
© 2008 Microchip Technology Inc.
DS51758A-page 3
MCP9800 Temperature Sensor Demo Board User’s Guide
NOTES:
DS51758A-page 4
© 2008 Microchip Technology Inc.
MCP9800 TEMPERATURE SENSOR
DEMO BOARD USER’S GUIDE
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.
Users can connect the demo board to a PC with USB interface and evaluate the sensor
performance. The 7-Segment LED displays temperature in degrees Celsius or degrees
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)
© 2008 Microchip Technology Inc.
DS51758A-page 5
MCP9800 Temperature Sensor Demo Board User’s Guide
NOTES:
DS51758A-page 6
© 2008 Microchip Technology Inc.
MCP9800 TEMPERATURE SENSOR
DEMO BOARD USER’S GUIDE
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 Hysteresis registers are programmed to a preset temperature limit based on the potentiometer wiper position. An LED is used to indicate overtemperature condition.
In addition, temperature can be 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
© 2008 Microchip Technology Inc.
DS51758A-page 7
MCP9800 Temperature Sensor Demo Board User’s Guide
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.
.
MCP9800
Alert Indicator
I2C Interface
I2C Interface
°C / °F
USB interface
PC
PIC18F2550
Display Controller
User Input:
Temperature
Alert/Hysteresis Limit Set
7-Segment display
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.
DS51758A-page 8
© 2008 Microchip Technology Inc.
Installation and Operation
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 and PC 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 temperature sensing applications. The register settings allow user selectable 9-bit to 12-bit
temperature measurement resolution, configuration of the power-saving Shutdown 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 temperature changes beyond the specified limits, the MCP9800 device outputs an alert signal.
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
The demo firmware programs the temperature limit and hysteresis limit registers (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-drain output 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.
© 2008 Microchip Technology Inc.
DS51758A-page 9
MCP9800 Temperature Sensor Demo Board User’s Guide
TABLE 2-1:
DS51758A-page 10
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
© 2008 Microchip Technology Inc.
Installation and Operation
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:
© 2008 Microchip Technology Inc.
Chart Setup Options.
DS51758A-page 11
MCP9800 Temperature Sensor Demo Board User’s Guide
NOTES:
DS51758A-page 12
© 2008 Microchip Technology Inc.
MCP9800 TEMPERATURE SENSOR
DEMO BOARD USER’S GUIDE
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
© 2008 Microchip Technology Inc.
DS51758A-page 13
MCP9800 Temperature Sensor Demo Board User’s Guide
BOARD SCHEMATIC
M
A.2
DS51758A-page 14
© 2008 Microchip Technology Inc.
Schematic and Layouts
BOARD - TOP LAYER
BOARD EDGE
A.3
102-00170
BOARD - TOP SILK-SCREEN LAYER
BOARD EDGE
A.4
102-00170
© 2008 Microchip Technology Inc.
DS51758A-page 15
MCP9800 Temperature Sensor Demo Board User’s Guide
A.5
BOARD - BOTTOM LAYER
104-00170-R1
DS51758A-page 16
© 2008 Microchip Technology Inc.
MCP9800 TEMPERATURE SENSOR
DEMO BOARD USER’S GUIDE
Appendix B. Bill Of Materials (BOM)
TABLE B-1:
BILL OF MATERIALS
Qty Reference
Description
Manufacturer
Part Number
1
C1
CAP .1UF 25V CERAMIC X7R
0805
Panasonic® - ECG
ECJ-2VB1E104K
1
C2
CAP 4.7UF 6.3V CERAMIC 0805
X5R
Panasonic - ECG
ECJ-2FB0J475M
1
C3
CAP CER 1UF 10V X7R 0603
Murata Electronics® North
America
GRM188R71A105KA61D
2
C4, C7
CAP 1.0UF 10V CERAMIC X7R
0805
Kemet
C0805C105K8RACTU
2
C5, C6
CAP CER 10UF 16V Y5V 0805
Murata Electronics North
America
GRM21BF51C106ZE15L
1
C8
CAP 1000PF 50V CERAMIC X7R
0805
Kemet® Electronics Corp
C0805C102K5RACTU
2
C9, C10
CAP 22PF 50V CERM CHIP 0805
SMD
Panasonic - ECG
ECJ-2VC1H220J
1
D1
LED RED CLEAR 0805 SMD
Lite-On Trading USA Inc
LTST-C170CKT
4
EA Conner of Bd.
BUMPON TALL TAPER SQ .50X.23 3M
BK (Note: When placing Order,
Comes in 64pcs quantities enough
for 16 boards.)
SJ-5518 (BLACK)
1
J1
CONN RECEPT MINI USB2.0
5POS
Hirose Electronic Co Ltd
UX60-MB-5ST
1
J2
NOT POPULATED
CONN MOD JACK 6-6 R/A PCB
50AU
Tyco®/AMP Electronics
5520470-3
1
L1
INDUCTOR 10UH 100MA 0805
Murata Electronics North
America
LQM21FN100M70L
1
LED1
LED 7 Segment .4" 4DGT SUPER
RED CA
Panasonic - ECG
LTC-4627JR
1
PCB
RoHS Compliant Bare PCB
MCP9800 Temperature Sensor
Demo Board
Microchip Technology Inc.
104-00170
5
R1, R2,
R10, R11,
R12
Chip Resistor, 10.0 kW, 1/10W, 1%, Panasonic - ECG
0805 SMD
ERJ-6ENF1002V
1
R13
RES 10.0 OHM 1/8W 1% 0805
SMD
Panasonic - ECG
ERJ-6ENF10R0V
1
R14
RES 100K OHM 1/8W 1% 0805
SMD
Panasonic - ECG
ERJ-6ENF1003V
1
R3
RES 1.00K OHM 1/8W 1% 0805
SMD
Panasonic - ECG
ERJ-6ENF1001V
Note:
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.
© 2008 Microchip Technology Inc.
DS51758A-page 17
MCP9800 Temperature Sensor Demo Board User’s Guide
TABLE B-1:
Qty Reference
BILL OF MATERIALS (CONTINUED)
Description
Manufacturer
Part Number
4
R4, R5,
R6, R7
RES 100 OHM 1/8W 1% 0805 SMD Panasonic - ECG
ERJ-6ENF1000V
1
R8
RES 20.0K OHM 1/8W 1% 0805
SMD
Panasonic - ECG
ERJ-6ENF2002V
1
R9
RES 475 OHM 1/8W 1% 0805 SMD Panasonic - ECG
ERJ-6ENF4750V
1
S1
SWITCH TACT 6MM SMD MOM
160GF
Omron Electronics, Inc-ECB
Div
B3S-1000
1
U1
2-Wire High-Accuracy Temperature
Sensor
Microchip Technology Inc.
MCP9800A0T-M/OTRC2
1
U2
28/40/44-Pin, High-Performance,
Microchip Technology Inc.
Enhanced Flash, USB Microcontrollers with nanoWatt Technology
PIC18F2550-I/SO
1
U3
Logic-Input CMOS Quad Drivers
TC4469COE
1
VR1
Pot 10k Ohm Thumbwheel Cerm St Bourns Inc.
3352T-1-103LF
1
Y1
CRYSTAL 20.0000 MHZ SERIES
SMT
ATS200SM
Note:
Microchip Technology Inc.
CTS-Frequency Controls
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.
DS51758A-page 18
© 2008 Microchip Technology Inc.
Bill Of Materials (BOM)
NOTES:
© 2008 Microchip Technology Inc.
DS51758A-page 19
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Tel: 86-28-8665-5511
Fax: 86-28-8665-7889
Korea - Daegu
Tel: 82-53-744-4301
Fax: 82-53-744-4302
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
Taiwan - Hsin Chu
Tel: 886-3-572-9526
Fax: 886-3-572-6459
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
China - Xiamen
Tel: 86-592-2388138
Fax: 86-592-2388130
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
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
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
01/02/08
DS51758A-page 20
© 2008 Microchip Technology Inc.