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19-1980; Rev 0; 3/01
MAX6651 Evaluation System
General Description
The MAX6651 evaluation kit (EV kit) is an assembled and tested circuit board that demonstrates the MAX6651 intelligent fan controller IC. Windows(R) 95/98 software provides a handy user interface to exercise the MAX6651's features. Order the MAX6651EVSYS for complete evaluation of the MAX6651, including a Maxim SMBus Interface Board (MAXSMBUS). Order the MAX6651EVKIT if you already have an SMBus interface. o Proven PC Board Layout o Convenient On-Board Test Points o Fully Assembled and Tested
Features
Evaluates: MAX6651
MAX6651 EV Kit Files
EV KIT FILES INSTALL.EXE MAX6651.EXE LPTCON.VXD DESCRIPTION Installs the EV kit files on your computer Application program Required parallel port driver PART MAX6651EVKIT MAX6651EVSYS
Ordering Information
TEMP. RANGE 0C to +70C 0C to +70C INTERFACE TYPE User supplied Windows software
Component List
MAX6651EVSYS SYSTEM COMPONENT LIST PART MAX6651EVKIT MAXSMBUS QTY 1 1 DESCRIPTION MAX6651 EV kit PC parallel port to SMBus interface Q1 Q1 Q1 Q1 R1 R2 R3 R4-R8 U1 None None None 1 1 1 1 1 1 1 5 1 1 1 1 MAX6651EVKIT COMPONENT LIST DESIGNATION QTY DESCRIPTION TO-220 logic-level N-channel FET International Rectifier IRFZ24N (Rdson < 0.1 at 5Vgs, 30Vbdss) Heatsink, thermalloy 6028 No. 4 nut 4-40 x 1/4in machine screw 10k 1% resistor (1206) 100k 1% resistor (1206) 560 5% resistor (1206) 49.9k 1% resistors (1206) MAX6651EEE PC board, MAX6651 EV kit 3 1/2in software disk, MAX6651 EV kit MAX6651 EV kit data sheet (includes MAXSMBUS manual)
MAX6651EVKIT COMPONENT LIST DESIGNATION C1 C2 C3 LED1 P1 RP1 J1-J5, J7-J12 J1, J5, J8-J12 QTY 1 0 1 1 1 1 11 7 DESCRIPTION 10F, 25V radial leaded electrolytic capacitor Open 0.1F ceramic capacitor (1206) Light-emitting diode 2 x 10 right-angle socket SamTec SSW-110-02-S-D-RA SIP resistor network, 10k, 6 pins, common 2-pin headers Shunts
SMBus is a trademark of Intel Corp. Windows is a registered trademark of Microsoft Corp. ________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX6651 Evaluation System Evaluates: MAX6651
Recommended Equipment
Before you begin, you will need the following equipment: * Maxim MAX6651EVKIT and MAXSMBUS interface board * A 12VDC power supply * A computer running Windows 95/98 * A spare parallel port * A 25-pin I/O extension cable
Description of Software
The main window shows the register values of the MAX6651. Register bit fields are presented as dropdown combo boxes. The 1/Speed and Tach0-3 register values are also translated into the corresponding fan (RPMs).
Detailed Description of Hardware
U1, the MAX6651, is an intelligent fan controller. MOSFET Q1 regulates the fan voltage (measured by the FB input). In closed-loop mode, adjusting the fan voltage set point regulates the main fan's tachometer output.
Quick Start
1) With the power off, connect the 12VDC power supply of the MAXSMBUS board between POS9 and GND. 2) Also connect the 12VDC supply to the MAX6651 EV kit at the pads labeled FAN SUPPLY (). (The MAX6651's +5V supply comes from the MAXSMBUS board.) 3) Connect the boards together. 4) Connect the 25-pin I/O extension cable from the computer's parallel port to the MAXSMBUS board. The EV kit software uses a loopback connection to confirm that the correct port has been selected. 5) Ensure that the jumper settings are in the default position (Table 1). 6) Connect a 12V tachometer-output fan to the FAN0+, FAN0-, and FAN0T terminals. Additional fans may be connected at FAN1+/FAN1-, FAN2+/FAN2-, and FAN3+/FAN3-. Optional tachometer inputs FAN1T, FAN2T, and FAN3T may be used to monitor the auxiliary fans' speed. 7) Install the MAX6651 EV kit software on your computer by running the INSTALL.EXE program on the floppy disk. The program files are copied and icons are created for them in the Windows Start menu. 8) Turn on the power supply. The fan will turn on at full speed. 9) Start the MAX6651 program by opening its icon in the Start menu. 10) In the Config register, drop down the full-on combo box and choose closed-loop mode. 11) In the 1/Speed register, type in the value "100." Adjust this value up or down to choose the target fan speed. Increasing the 1/Speed value makes the closed-loop set point a slower fan speed. 12) Observe measured fan speed in the Tach0 tachometer display.
2
PC Board Layout Tips
For best results, keep the Q1 gate drive trace as short as possible. See Figure 1, which shows the MAX6651 EV kit schematic, and refer to the MAX6651 data sheet.
Troubleshooting
Problem: Cannot find MAX6651 parallel port connection. Ensure that the I/O extension cable is connected to a parallel port, and not to a SCSI or other type of port. Verify that the supplied LPTCON.VXD is in the same directory as MAX6651.EXE. If a local printer driver is installed, temporarily disable it. The software will not work if the program icon is dragged onto the Windows desktop; instead, install the software into a subdirectory, such as C:\MAX6651. The software can also be run directly from its floppy disk, as long as both MAX6651.EXE and LPTCON.VXD are in the same directory.
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MAX6651 Evaluation System Evaluates: MAX6651
Table 1. Jumper Functions
JUMPER J1 J2 J3 J4 J5 J7 J8 J9 J10 J11 J12 POSITION *Open *Open *Open *Closed *Closed Open Closed *Open *Closed Open *Closed Open *Closed Open *Closed Open *Closed Open See Table 2. See Table 2. See Table 2. See Table 2. Connect on-board LED to GPIO0 output. Disconnect on-board LED from GPIO0 output. Connect GPIO0 to GPIO1. GPIO0 is not connected to GPIO1. Fan 3 tachometer connects to FAN3T directly. Fan 3 tachometer connects to FAN3T through 49.9k resistor R8. Fan 2 tachometer connects to FAN2T directly. Fan 2 tachometer connects to FAN2T through 49.9k resistor R7. Fan 1 tachometer connects to FAN1T directly. Fan 1 tachometer connects to FAN1T through 49.9k resistor R6. Fan 0 tachometer connects to FAN0T directly. Fan 0 tachometer connects to FAN0T through 49.9k resistor R5. FB feedback input connects to Q1 drain directly. FB feedback input connects to Q1 drain through 49.9k resistor R4. FUNCTION
*Default configuration
Table 2. Address Selection Jumpers
J1 Closed Open Open *Open J2 Open Closed Open *Open J3 Open Open Closed *Open J4 Open Open Open *Closed ADDRESS 1001 011R 0011 111R 1001 000R 0011 011R
*Default configuration
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3
Evaluates: MAX6651
MAX6651 Evaluation System
Figure 1. MAX6651 EV Kit Schematic
VCC C3 0.1F J5 R3 560 VCC FAN3+ RP1 10k 5 J8 FAN3T FAN3J9 FAN2+ FAN2T FAN2FAN1+ FAN1T R6 49.9k 1% J11 TACH0 GPIO4 J12 FB 15 ADD 8 GND OUT 4 13 1 R5 49.9k 1% FAN1FAN0+ FAN0T FAN0J10 11 GPIO2 TACH1 16 R7 49.9k 1% R8 49.9k 1% 9 GPIO1 TACH2 2 LED1 10 GPIO0 14 VCC 3 TACH3 J7
4
U1 MAX6651
12 GPIO3 7 5 SDA 6 SCL VCC J1 J2 J3 J4 R4 49.9k 1% FAN_SUPPLY+ Q1 C1 10F 25V C2 OPEN FAN_SUPPLYR2 100k 1% R1 10k 1%
GPIO 0
VCC
GPIO 1
GPIO 2
GPIO 3
GPIO 4
VCC
P1-2 P1-4
P1-6
P1-1 P1-3 P1-5
SDA
P1-8
SCL
P1-10
P1-12
P1-7 P1-9
P1-14
P1-16
P1-11 P1-13
P1-18
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P1-20
P1-15 P1-17
P1-19
MAX6651 Evaluation Kit Evaluates: MAX6651
Figure 2. MAX6651 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX6651 EV Kit PC Board Layout--Component Side
Figure 4. MAX6651 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.
5 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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