19-1980; Rev 0; 3/01 MAX6651 Evaluation System Features ♦ Proven PC Board Layout ♦ Convenient On-Board Test Points ♦ Fully Assembled and Tested Ordering Information MAX6651 EV Kit Files EV KIT FILES DESCRIPTION PART TEMP. RANGE INTERFACE TYPE Application program MAX6651EVKIT 0°C to +70°C User supplied Required parallel port driver MAX6651EVSYS 0°C to +70°C Windows software INSTALL.EXE Installs the EV kit files on your computer MAX6651.EXE LPTCON.VXD Component List MAX6651EVSYS SYSTEM COMPONENT LIST PART QTY MAX6651EVKIT 1 MAX6651 EV kit 1 PC parallel port to SMBus interface MAXSMBUS DESCRIPTION MAX6651EVKIT COMPONENT LIST DESIGNATION QTY C1 1 DESCRIPTION 10µF, 25V radial leaded electrolytic capacitor C2 0 Open C3 1 0.1µF ceramic capacitor (1206) MAX6651EVKIT COMPONENT LIST DESIGNATION QTY DESCRIPTION Q1 1 TO-220 logic-level N-channel FET International Rectifier IRFZ24N (Rdson < 0.1Ω at 5Vgs, 30Vbdss) Q1 1 Heatsink, thermalloy 6028 Q1 1 No. 4 nut Q1 1 4-40 x 1/4in machine screw R1 1 10kΩ ±1% resistor (1206) R2 1 100kΩ ±1% resistor (1206) 560Ω ±5% resistor (1206) R3 1 R4–R8 5 49.9kΩ ±1% resistors (1206) U1 1 MAX6651EEE None 1 PC board, MAX6651 EV kit LED1 1 Light-emitting diode P1 1 2 x 10 right-angle socket SamTec SSW-110-02-S-D-RA RP1 1 SIP resistor network, 10kΩ, 6 pins, common None 1 3 1/2in software disk, MAX6651 EV kit J1–J5, J7–J12 11 2-pin headers None 1 J1, J5, J8–J12 7 Shunts MAX6651 EV kit data sheet (includes MAXSMBUS manual) 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. Evaluates: MAX6651 General Description The MAX6651 evaluation kit (EV kit) is an assembled and tested circuit board that demonstrates the MAX6651 intelligent fan controller IC. Windows® 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. Evaluates: MAX6651 MAX6651 Evaluation System Recommended Equipment Description of Software Before you begin, you will need the following equipment: • Maxim MAX6651EVKIT and MAXSMBUS interface board 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). • A 12VDC power supply • A computer running Windows 95/98 • A spare parallel port • A 25-pin I/O extension cable 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. 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. 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. 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 _______________________________________________________________________________________ MAX6651 Evaluation System Evaluates: MAX6651 Table 1. Jumper Functions JUMPER POSITION J1 *Open See Table 2. J2 *Open See Table 2. J3 *Open See Table 2. J4 *Closed See Table 2. *Closed Connect on-board LED to GPIO0 output. J5 Open J7 Disconnect on-board LED from GPIO0 output. Closed Connect GPIO0 to GPIO1. *Open GPIO0 is not connected to GPIO1. *Closed J8 Fan 3 tachometer connects to FAN3T directly. Open Fan 3 tachometer connects to FAN3T through 49.9kΩ resistor R8. *Closed J9 Fan 2 tachometer connects to FAN2T directly. Open Fan 2 tachometer connects to FAN2T through 49.9kΩ resistor R7. *Closed J10 Fan 1 tachometer connects to FAN1T directly. Open Fan 1 tachometer connects to FAN1T through 49.9kΩ resistor R6. *Closed J11 Fan 0 tachometer connects to FAN0T directly. Open Fan 0 tachometer connects to FAN0T through 49.9kΩ resistor R5. *Closed J12 FUNCTION FB feedback input connects to Q1 drain directly. Open FB feedback input connects to Q1 drain through 49.9kΩ resistor R4. *Default configuration Table 2. Address Selection Jumpers J1 J2 J3 J4 ADDRESS Closed Open Open Open 1001 011R Open Closed Open Open 0011 111R Open Open Closed Open 1001 000R *Open *Open *Open *Closed 0011 011R *Default configuration _______________________________________________________________________________________ 3 4 P1-20 P1-18 P1-16 P1-19 P1-15 P1-17 P1-11 P1-13 P1-14 P1-12 P1-7 P1-9 P1-1 P1-3 P1-5 P1-10 P1-8 P1-6 P1-2 P1-4 VCC GPIO 4 GPIO 3 GPIO 2 GPIO 1 SCL SDA VCC GPIO 0 J7 LED1 R3 560Ω J5 VCC GPIO4 GPIO3 GPIO2 GPIO1 GPIO0 VCC J2 R1 10kΩ 1% J1 5 SDA 6 SCL 7 12 11 9 10 C3 0.1µF J3 ADD 8 R2 100kΩ 1% J4 1 16 2 FB 15 TACH0 TACH1 GND OUT 4 13 MAX6651 U1 TACH2 14 VCC 3 TACH3 VCC Q1 R4 49.9kΩ 1% J12 R6 49.9kΩ 1% J10 R8 49.9kΩ 1% J8 C1 10µF 25V C2 OPEN R5 49.9kΩ 1% J11 R7 49.9kΩ 1% J9 RP1 10kΩ ✕ 5 FAN_SUPPLY- FAN_SUPPLY+ FAN0- FAN0T FAN0+ FAN1- FAN1T FAN1+ FAN2- FAN2T FAN2+ FAN3- FAN3T FAN3+ Evaluates: MAX6651 MAX6651 Evaluation System Figure 1. MAX6651 EV Kit Schematic _______________________________________________________________________________________ MAX6651 Evaluation Kit 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 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Evaluates: MAX6651 Figure 2. MAX6651 EV Kit Component Placement Guide— Component Side