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19-2343; Rev 0; 2/02
MAX6683 Evaluation System/Evaluation Kit
General Description
The MAX6683 evaluation system (EV system) consists of a MAX6683 evaluation kit (EV kit) and a companion Maxim system management bus (SMBus)TM interface board (MAXSMBUS). The MAX6683 EV kit is an assembled and tested PC board that demonstrates the MAX6683 temperature sensor and system monitor. The MAX6683 monitors temperature, supply voltage, and the voltage of three external supplies. Temperature is converted to 11-bit serial data and voltage to 8-bit data. The MAXSMBUS allows an IBM-compatible PC to use its parallel port to emulate an Intel (SMBus). Windows(R) 95/98/2000-compatible software provides a user-friendly interface to exercise the features of the MAX6683. The program is menu driven and offers a graphic interface with control buttons and status display. Note: Windows 2000 requires the installation of a driver; refer to Win2000.pdf or Win2000.txt located on the diskette. Order the MAX6683EVSYS for a complete IBM PC-based evaluation of the MAX6683. Order the MAX6683EVKIT if you already have an SMBus interface. To evaluate the MAX6652, order a free sample of the MAX6652AUB.
Features
o Measure and Display the MAX6683 Temperature o Monitor Four Voltage Channels Three External (1.8V, 2.5V, and 5V Nominal) VCC Pin (3.3V Nominal) o Programmable Alarms and Configuration o SMBus/I2CTM Compatible o Easy-to-Use Menu-Driven Software o Assembled and Tested o Include Windows 95/98/2000-Compatible Software and Demo PC Board
Evaluate: MAX6652/MAX6683
Ordering Information
PART MAX6683EVKIT MAX6683EVSYS TEMP RANGE 0C to +70C 0C to +70C INTERFACE TYPE Not included MAXSMBUS
Note: The MAX6683 EV kit software is provided with the MAX6683EVKIT. However, the MAXSMBUS board is required to interface the EV kit to the computer when using the software.
MAX6683EVSYS Component List
PART MAX6683EVKIT MAXSMBUS QTY 1 1 DESCRIPTION MAX6683 evaluation kit SMBus interface board C1, C2 2 PART QTY
MAX6683EVKIT Component List
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 2 10 right-angle female receptacle 2 4 straight header Not installed 10k 5% resistors 470k 5% resistor Slide switch MAX6683AUB MAX1615EUK Shunt for JU1
C3
1
J1 JU1 JU2 R1, R2, R3
1 1 0 3 1 1 1 1 1
SMBus is a trademark of Intel Corp. Windows is a registered trademark of Microsoft Corp. I2C is a trademark of Philips Corp.
R4 SW1 U1 U2 None
________________________________________________________________ Maxim Integrated Products
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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.
MAX6683 Evaluation System/Evaluation Kit Evaluate: MAX6652/MAX6683
Component Suppliers
SUPPLIER Murata Taiyo Yuden TDK PHONE 770-436-1300 800-348-2496 847-803-6100 FAX 770-436-3030 847-925-0899 847-390-4405 WEBSITE www.murata.com www.t-yuden.com www.component.tdk.com
Note: Please indicate you are using the MAX6683 when contacting these manufacturers.
Quick Start
Required Equipment
Before you begin, the following equipment is needed: * A 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. * A parallel printer port (this is a 25-pin socket on the back of the computer) * A standard 25-pin, straight-through, male-to-female cable (printer extension cable) to connect the computer's parallel port to the Maxim SMBus interface board * DC power supply capable of supplying any voltage between 7V and 20V at 100mA * 3.3V power supply for VCC * 1.8V power supply* * 2.5V power supply* * 5V power supply*
from the floppy or hard drive. Use the Windows program manager to run the program. 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. Do not turn on the power until all connections are made. 6) Connect the 3.3V power supply to the VCC and GND pads. 7) Connect the 1.8V nominal power supply to the 1.8V and GND pads. 8) Connect the 2.5V nominal power supply to the 2.5 and GND pads. 9) Connect the 5V nominal power supply to the 5 and GND pads. 10) Connect the 7V to 20V power supply to the pads labeled POS9 and GND1 on the SMBus interface board. 11) Turn on the power supplies.
Procedure
1) Carefully connect the boards by aligning the 20-pin connector of the MAX6683 EV kit with the 20-pin header of the MAXSMBUS interface board. Gently press them together. 2) Make sure switch SW1 on the MAX6683 EV kit is in the OFF position. 3) Make sure JU3 is set to the 1-2 position. 4) Connect a straight-through 25-pin female-to-male cable from the computer's parallel port to the SMBus interface board. 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. 5) The MAX6683.EXE software program can be run *These supplies are optional; however, if different nominal supplies are used, appropriate threshold values should be programmed.
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12) Turn on the EV kit by moving SW1 to the ON position. 13) Start the MAX6683 program by opening its icon in the Start menu. 14) Wait until the program automatically detects the address of the MAX6683 and displays the userinterface panel (Figure 1). 15) Select the Configuration tab on the panel. 16) Uncheck the Interrupt Clear checkbox. 17) Check the START checkbox. 18) Verify that the temperature displayed on the userinterface panel is not 0.000C.
Detailed Description
User-Interface Panel
The user interface is easy to operate using the mouse, or by using the Tab key to navigate with the arrow keys. The checkboxes, edit fields, and radio buttons correspond to bits in the internal registers. By clicking on
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MAX6683 Evaluation System/Evaluation Kit
them, the correct SMBus write operation is generated to update the registers. Note: Words in boldface are user-selectable features in the software. The program monitors for an alert interrupt and continually polls the device for new temperature, voltage, and status data. To disable the continuous polling of data, uncheck the Automatic Read checkbox. To change the temperature or voltage threshold comparison registers, select the appropriate data field and type in the new value. Pressing Enter, after typing in the new values, updates the internal registers. The message ALERT appears whenever an interrupt condition occurs. To clear the interrupt, first eliminate the condition that caused it and then click on Read Status.
Jumper and Switch Settings
Jumper 1 (JU1) sets the MAX6683 slave address. The default address is 0010 101 (ADD = VCC); see Table 1 for a complete list of addresses. The slide switch, SW1, provides a means to force a reset. This switch disables power to the device.
Evaluate: MAX6652/MAX6683
Table 1. JU1 Shunt Settings for SMBus Address
SHUNT LOCATION 0x28 0x2A 0x2C 0x2E ADD CONNECTION To GND To VCC To SDA To SCL MAX6683 ADDRESS 0010 100Y 0010 101Y 0010 110Y 0010 111Y
Simple SMBus Commands
There are two methods for communicating with the MAX6683: through the normal user-interface panel or through the SMBus commands available from pressing the MAXSMBUS button. A display appears that allows the SMBus protocols, such as Read Byte and Write Byte, to be executed. To stop normal user-interface execution so that it does not override the manually set values, turn off the update timer that slaves the program to the conversion rate by unchecking the Automatic Read checkbox. The SMBus dialog boxes accept numeric data in binary, decimal, or hexadecimal. Hexadecimal numbers should be prefixed by $ or 0x. Binary numbers must be exactly eight digits. Note: In places where the slave address asks for an 8bit value, it must be the 7-bit slave address of the MAX6683 as determined by the address pin (ADD) with the last bit set to 1 for a read operation and 0 for a write.
Note: The first 7 bits shown are the address. Y (bit 0) is the SMBus read/write bit. This bit is a 1 for a read operation and zero for a write.
Evaluating the MAX6652
The MAX6683 EV kit can also evaluate the MAX6652. Remove the MAX6683 from the board and install the MAX6652. The MAX6652 and MAX6683 monitor different voltages. See Table 2. When evaluating the MAX6652 with the MAX6683 software, the voltages displayed for the supply voltage (VCC), the 1.8V nominal voltage, and the 5V nominal voltage are incorrect. However, the ADC output code, shown in parentheses next to the voltage, is correct. Use the equations shown below to calculate the actual voltages: 5V x ADC output code 192 12V x ADC output code Voltage on pin 1 = 192 3.3V x ADC output code Voltage on pin 3 = 192 VCC =
Data Logging
Check the Data Logging checkbox to activate data logging. Data logging saves temperature, voltage, 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 2Hz; however, the data is logged to the file only if the temperature, voltage, or status change. This slows the growth of the data-logging file. When Automatic Read is disabled, the data is logged each time the Read All button is clicked. To stop data logging, uncheck the Data Logging checkbox.
Table 2. Voltage Monitor Differences Between MAX6652 and MAX6683
PIN 10 (VCC) 1 3 MAX6652 (V) 5 12 3.3 MAX6683 (V) 3.3 1.8 5
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MAX6683 Evaluation System/Evaluation Kit Evaluate: MAX6652/MAX6683
Figure 1. User-Interface Panel for MAX6683EVKIT 4 _______________________________________________________________________________________
MAX6683 Evaluation System/Evaluation Kit Evaluate: MAX6652/MAX6683
Figure 2. Configuration Display
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MAX6683 Evaluation System/Evaluation Kit Evaluate: MAX6652/MAX6683
VCC HEADER-20 PIN J1-3 J1-7 J1-11 J1-1 J1-9 J1-13 J1-15 J1-17 N.C. N.C. N.C. N.C. N.C. SDA SCL ALERT J1-2 J1-4 J1-6 J1-8 J1-10 J1-12 J1-14 J1-16 J1-18 J1-5 J1-19 5V SDA JU1 8 6 4 2 7 5 3 1 SCL VCC 7 ALERT R3 10k 6 ALERT GND 5 5V VCC 3 1 GND SW1 2
ADD U1 N.C. 4
SDA J1-20 1 C2 0.1F 2 5V 5V JU2 CUT HERE 3 R4 470k C3 2.2F 5/3 (FB) 4 SCL VCC IN U2 SHDN 5 SDA
R2 10k 8 5V SDA
MAX6683
5 VIN 3 5 VIN
MAX1615
GND SCL
R1 10k 8 SCL
2.5 VIN
2
2.5 VIN
OUT
10 C1 0.1F
VCC
1.8 VIN
1
1.8 VIN
GND
Figure 3. MAX6683 EV Kit Schematic
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MAX6683 Evaluation System/Evaluation Kit Evaluate: MAX6652/MAX6683
Figure 4. MAX6683 EV Kit Component Placement Guide-- Component Side
Figure 5. MAX6683 EV Kit PC Board Layout--Component Side
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MAX6683 Evaluation System/Evaluation Kit Evaluate: MAX6652/MAX6683
Figure 6. MAX6683 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.
8 _____________________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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