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19-2345; Rev 0; 02/02
MAX6675 Evaluation Kit
General Description
The MAX6675 evaluation kit (EV kit) is an assembled and tested PC board that demonstrates the MAX6675 thermocouple digital temperature sensor. It accepts the input from a type-K thermocouple and converts the temperature to 12-bit data. The MAX6675 EV kit connects to a computer for acquiring the data from the MAX6675. Windows(R) 95/98/2000compatible software provides a user-friendly interface to display the 12-bit data and convert it to a temperature. The EV kit includes a type-K thermocouple for evaluation up to +80C. To evaluate the MAX6674, order a free sample of the MAX6674ISA.
Features
o Digitizes and Displays Temperature from a Type-K Thermocouple o SPITM-Compatible Serial Interface o Easy-to-Use Menu-Driven Software o Available in an 8-Pin SO Package o Assembled and Tested o Includes Windows 95/98/2000-Compatible Software, Demo PC Board, and Type-K Thermocouple
Evaluates: MAX6674/MAX6675
Component List
DESIGNATION QTY DESCRIPTION 0.1F, 16V X7R ceramic capacitors Taiyo Yuden EMK107BJ104KA Murata GRM188R71C104KA01 TDK C1608X7R1C104K 2.2F, 16V X7R ceramic capacitor Taiyo Yuden EMK316BJ225ML Murata GRM42-6X7R225K016 TDK C3216X7R1C225M DB-25 male right-angle connector Thermocouple connector, miniature size, type K Omega PCC-SMP-K Not installed 470k 5% resistor MAX6675ISA temperature sensor MAX1840EUB/MAX1841EUB level translator MAX1615EUK linear voltage regulator Thermocouple, epoxy-coated tip, -10C to +80C, miniature-size male connector, type K Omega TC-PVC-K-24-180 PART MAX6675EVKIT C1-C4 4
Ordering Information
TEMP RANGE 0C to +70C IC PACKAGE 8 SO
Quick Start
Required Equipment
Before you begin, the following equipment is needed: * Computer running Windows 95, 98, or 2000 (Note: Windows 2000 requires the installation of a driver; refer to Win2000.pdf or Win2000.txt located on the diskette.) * * Parallel printer port (this is a 25-pin socket on the back of the computer) Standard 25-pin, straight-through, male-to-female cable (printer extension cable) to connect the computer's parallel port to the MAX6675 EV kit DC power supply capable of supplying any voltage between 7V and 20V at 100mA
C5
1
J1 J2 JU1-JU5 R1 U1 U2 U3
1 1 0 1 1 1 1
*
Procedure
Do not turn on the power until all connections are made. 1) Connect a cable from the computer's parallel port to the MAX6675 EV kit. Use a straight-through 25pin female-to-male cable. To avoid damaging the EV kit or your computer, do not use a 25-pin SCSI port or any other connector that is physically similar to the 25-pin parallel printer port.
None
1
Windows is a registered trademark of Microsoft Corp. SPI is a trademark of Motorola, Inc. ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX6675 Evaluation Kit Evaluates: MAX6674/MAX6675
Component Suppliers
SUPPLIER Murata Omega Taiyo Yuden TDK PHONE 770-436-1300 888-826-6342 800-348-2496 847-803-6100 FAX 770-436-3030 -- 847-925-0899 847-390-4405 WEBSITE www.murata.com www.omega.com www.t-yuden.com www.component.tdk.com
Note: Please indicate that you are using the MAX6675 when contacting these manufacturers.
2) The MAX6675.EXE software program can be run from the floppy or hard drive. Use the Windows program manager to run the program. If desired, you may use the INSTALL.EXE program to copy the files and create icons for them in the Windows 95/ 98/2000 Start menu. An uninstall program is included with the software. Click on the UNINSTALL icon to remove the EV kit software from the hard drive. 3) Connect the 7V to 20V supply to the pads labeled VIN and GND. 4) Turn on the power supply. 5) Start the MAX6675 program by opening its icon in the Start menu. 6) Observe as the program automatically detects the MAX6675 and starts the main program.
General-Purpose SPI Utility
There are two methods for communicating with the MAX6675: through the user-interface panel or through the general-purpose SPI utility. This utility (Figure 2) configures SPI parameters such as clock polarity (CPOL), clock phase (CPHA), and chip-select (CS) polarity. The fields where pin numbers are required apply to the pins of the parallel port connector. The utility handles the data only in byte (8-bit) format. Data longer than 1 byte must be handled as multiple bytes. For example, a 16-bit word should be broken into two 8-bit bytes. To write data to the slave device, enter the data into the field labeled: Data bytes to be written. Each data byte should be hexadecimal, prefixed by 0x, and separated with a comma. Press the Send Now button to write the data to the slave. Note: The MAX6675 is a read-only device and cannot be written to. To read data from the slave device, the field: Data bytes to be written: must contain hexadecimal values, includes the same number of bytes as to be read from the slave. For example, to read 16-bit data from the MAX6675, 2 bytes must be written, each prefixed by 0x and separated by a comma (default is 0x00, 0x00). Note: When using the SPI utility, uncheck the Automatic Read checkbox in the main display.
Detailed Description
User-Interface Panel
The user interface is easy to operate. Use either the mouse or the Tab key to navigate. Note: Words in boldface are user-selectable features in the software. The program continually polls the device for new temperature data. To disable the continuous polling of data, uncheck the Automatic Read checkbox. Press Read Temp to get the current temperature.
Data Logging
Check the Data Logging checkbox to activate data logging. Data logging saves temperature and status data to a text file that includes a time/date stamp next to each data point. If Automatic Read is enabled, data is sampled at 1Hz; however, the data is logged to the file only if the temperature changes. This slows the growth of the data-logging file. When Automatic Read is disabled, the data is logged each time the Read Temp button is clicked. To stop data logging, uncheck the Data Logging checkbox.
Evaluating with a Lower Supply Voltage
The MAX6675 EV kit is configured for operating at 5V. To evaluate the MAX6675 at a lower supply voltage, cut the traces shorting the pins of JU1. Apply the desired voltage (between 3V and 5V) to the VCC pad. Note: A 7V to 20V supply must be connected to VIN to power the MAX1840 level translator.
Connecting to a Microcontroller
The MAX6675 EV kit can be monitored externally with a microcontroller or other control device by cutting the traces shorting the pins of JU2, JU3, and JU4 and connecting to the pads labeled SCK, CS, and SO.
2
_______________________________________________________________________________________
MAX6675 Evaluation Kit Evaluates: MAX6674/MAX6675
Figure 1. Main Display for the MAX6675EVKIT
Evaluating the MAX6674
The MAX6675 EV kit can also evaluate the MAX6674. Remove the MAX6675 from the board and install the new part. Select the MAX6674 radio button on the main display of the software.
Open Thermocouple Detection
To enable the Open Thermocouple Detection, install a shunt on jumper JU6. This connects pin 2 of the MAX6675 to ground.
Figure 2. SPI Utility Showing the Settings to Communicate with the MAX6675 EV Kit
_______________________________________________________________________________________
3
MAX6675 Evaluation Kit Evaluates: MAX6674/MAX6675
VIN
1
IN U3
SHDN
5
C4 0.1F X_SO X_SO 5V 2 C2 0.1F X_SCK X_SCK X_CS X_CS 5V 5 SHDN 4 RIN RST GND 7 6 MAX1840 3 CIN CLK 8 JU3 CUT HERE JU4 CUT HERE DVCC U2 VCC 9 C3 0.1F R1 470k C5 2.2F 1 DATA I/O GND JU2 10 CUT HERE VCC SO 5V 5V JU5 CUT HERE 2
GND
MAX1615
3
OUT
5/3 (FB)
4
SCK
CS
J1-1 J1-2 J1-3 J1-4 J1-5 J1-6 J1-7 J1-8 J1-9
NC X_SCK
DB-25 CONNECTOR J1-10 X_SO NC J1-13 NC NC NC NC J1-14 J1-15 J1-16 J1-17 NC NC NC NC J1-18 J1-19 J1-20 J1-21 J1-22 J1-23 J1-24 J1-25 VCC 5V JU1 CUT HERE J2 JU6
1
GND
8 N.C. 7
2
NC
X_CS
J1-11 J1-12
T-
U1 MAX6675
SO
+ VCC
3 4
T+ VCC
CS SCK
6 5
C1 0.1F
Figure 3. MAX6675 EV Kit Schematic
4
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MAX6675 Evaluation Kit Evaluates: MAX6674/MAX6675
1.0"
Figure 4. MAX6675 EV Kit Component Placement Guide-- Component Side
1.0"
Figure 5. MAX6675 EV Kit PC Board Layout--Component Side
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5
MAX6675 Evaluation Kit Evaluates: MAX6674/MAX6675
1.0"
Figure 6. MAX6675 EV Kit PC Board Layout--Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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