Evaluate: MAX6651 19-1980 Rev 1 5/07 MAX6651 Evaluation Kit/Evaluation System General Description Features The MAX6651 evaluation kit (EV kit) is an assembled Proven PCB Layout and tested printed-circuit board (PCB) that demon- strates the MAX6651 intelligent fan controller IC. Convenient On-Board Test Points Windows 98SE/2000/XP-compatible software provides Fully Assembled and Tested a handy user interface to exercise the MAX6651s fea- tures. Order the MAX6651 EV system for complete eval- EV System Includes USB Connectivity uation of the MAX6651, including a Maxim SMBus interface board (CMAXQUSB). Order the MAX6651 EV kit if you already have an SMBus interface. Ordering Information T EM P I N T ERF A C E PAR T R A N G E T YPE M A X66 5 1 EVK IT 0C to + 70C *U ser su p p l i ed M A X66 5 1 EVC M A XQU 0C to + 70C *W i ndow s s oftwar e *This limited temperature range applies to the EV kit PCB only. SMBus is a trademark of Intel Corp. The MAX6651 IC temperature range is -40C to +85C. Windows is a registered trademark of Microsoft Corp. Component Lists MAX6651 EV Kit MAX6651 EV System PART QTY DESCRIPTION DESIGNATION QTY DESCRIPTION M AX6651EV KIT 1 MAX6651 EV kit 10F, 25V radial leaded C1 1 electrolytic capacitor CMAXQUSB+ 1 Serial interface board C2 0 Open +Denotes lead-free and RoHS-compliant. C3 1 0.1F ceramic capacitor (1206) J1J5, J7J12 11 2-pin headers LED1 1 Light-emitting diode Quick Start 2 x 10 right-angle socket Recommended Equipment P1 1 SamTec SSW-110-02-S-D-RA Before beginning, the following equipment is needed: TO-220 logic-level N-channel FET MAX6651 EV system: International Rectifier IRFZ24N 1 MAX6651 EV kit (Rdson < 0.1 at 5Vgs, 30Vbdss) Q1 Maxim CMAXQUSB interface board (USB cable 1 Heatsink, thermalloy 6028 included) 1 No. 4 nut A user-supplied Windows 98SE/2000/XP computer 1 4-40 x 1/4in machine screw with a spare USB port R1 1 10k 1% resistor (1206) A 12VDC power supply R2 1 100k 1% resistor (1206) Note: In the following sections, software-related items R3 1 560 5% resistor (1206) are identified by bolding. Text in bold refers to items R4R8 5 49.9k 1% resistors (1206) directly from the EV kit software. Text in bold and SIP resistor network, 10k , 6 pins, underlined refers to items from the Windows RP1 1 common 98SE/2000/XP operating system. U1 1 MAX6651EEE 7 Shunts (J1, J5, J8J12) 1 PCB: MAX6651 Evaluation Kit Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX6651 Evaluation Kit/Evaluation System Procedure 9) Follow the directions of the Add New Hardware The MAX6651 EV kit is fully assembled and tested. Wizard to install the USB device driver. Choose the Follow the steps below to verify board operation. Search for the best driver for your device option. Specify the location of the device driver to be Caution: Do not turn on the power supply until all C: Program Files MAX6651 (or the directory cho- connections are completed. sen during installation) using the Browse button. 1) Visit the Maxim website (www.maxim-ic.com/evkit- 10) Turn on the power supply. The fan will turn on at full software) to download the latest version of the EV speed. kit software, 6651Rxx.ZIP. 2) Install the MAX6651 evaluation software on your 11) Start the MAX6651 program by opening its icon in the Windows Start menu. computer by running the INSTALL.EXE program. The program files are copied and icons are created 12) Click the Registers panel at the top of the program. in the Windows Start menu. In the Config register, drop down the full-on combo box and choose closed-loop mode. 3) On the CMAXQUSB board, ensure the shunt of jumper JU1 is in the 5V position. 13) In the Speed register, type in the value100 4) Carefully connect the boards by aligning the 20-pin Adjust this value up or down to choose the target fan speed. Increasing the Speed value makes the connector of the MAX6651 EV kit with the 20-pin closed-loop set point a slower fan speed. header of the CMAXQUSB interface board. Gently press them together. 14) Observe measured fan speed in the Tach0 tachometer display. 5) Also connect the 12VDC supply to the MAX6651 EV kit at the pad labeled FAN SUPPLY () (the Detailed Description MAX6651s +5V supply comes from the CMAXQUSB board). of Software 6) Ensure that the jumper settings are in the default The main window (Figure 1) shows a block diagram of position (Table 1). the MAX6651 EV kit, which allows the user to configure the Fan Mode and Speed. The Registers tab (Figure 7) Connect a 12V tachometer-output fan to the 2) shows the register values of the MAX6651. Register FAN0+, FAN0-, and FAN0T terminals. Additional bit fields are presented as drop-down combo boxes. fans may be connected at FAN1+/FAN1-, The Speed and Tach0-3 register values are also trans- FAN2+/FAN2-, and FAN3+/FAN3-. Optional lated into the corresponding fan (RPMs). tachometer inputs FAN1T, FAN2T, and FAN3T may be used to monitor the auxiliary fans speed. Detailed Description 8) Connect the USB cable from the PC to the CMAX- of Hardware QUSB board. A Building Driver Database window U1, the MAX6651, is an intelligent fan controller. MOS- pops up in addition to a New Hardware Found FET Q1 regulates the fan voltage (measured by the FB message. If you do not see a window that is similar input). In closed-loop mode, adjusting the fan voltage to the one described above after 30 seconds, set point regulates the main fans tachometer output. remove the USB cable from the CMAXQUSB and reconnect it. Administrator privileges are required PCB Layout Tips to install the USB device driver on Windows For best results, keep the Q1 gate drive trace as short 98SE/2000/XP. Refer to the TROUBLESHOOT- as possible. ING USB.PDF document included with the software See Figure 3, which shows the MAX6651 EV kit if you have any problems during this step. schematic, and refer to the MAX6651 IC data sheet. 2 Evaluate: MAX6651