for price, delivery, and to place orders, please contact maxim distribution at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. general description the max6651 evaluation kit (ev kit) is an assembledand tested printed-circuit board (pcb) that demon- strates the max6651 intelligent fan controller ic. windows 98se/2000/xp-compatible software provides a handy user interface to exercise the max6651? fea- tures. order the max6651 ev system for complete eval- uation of the max6651, including a maxim smbus ? interface board (cmaxqusb). order the max6651 evkit if you already have an smbus interface. features ? proven pcb layout ? convenient on-board test points ? fully assembled and tested ? ev system includes usb connectivity evaluate: max6651 max6651 evaluation kit/evaluation system ________________________________________________________________ maxim integrated products 1 19-1980; rev 1; 5/07 component lists ordering information max6651 ev system part qty description m ax6651e v kit 1 max6651 ev kit cmaxqusb+ 1 serial interface board max6651 ev kit designation qty description c1 1 10?, 25v radial leadedelectrolytic capacitor c2 0 open c3 1 0.1? ceramic capacitor (1206) j1 j5, j7 j12 11 2-pin headers led1 1 light-emitting diode p1 1 2 x 10 right-angle socketsamtec ssw-110-02-s-d-ra 1 to-220 logic-level n-channel fetinternational rectifier irfz24n (rdson < 0.1 at 5vgs, 30vbdss) 1 heatsink, thermalloy 6028 1 no. 4 nut q1 1 4-40 x 1/4in machine screw r1 1 10k ?% resistor (1206) r2 1 100k ?% resistor (1206) r3 1 560 ?% resistor (1206) r4 r8 5 49.9k ?% resistors (1206) rp1 1 sip resistor network, 10k , 6 pins, common u1 1 max6651eee 7 shunts (j1, j5, j8 j12) 1 pcb: max6651 evaluation kit pa r t t em p r a n g e i n t er f a c e t ype m a x6 6 5 1 evk it 0 c to + 70 c *u ser sup p l i ed m a x6 6 5 1 evc m a xq u 0 c to + 70 c *w i nd ow s softw ar e smbus is a trademark of intel corp.windows is a registered trademark of microsoft corp. * this limited temperature range applies to the ev kit pcb only. the max6651 ic temperature range is -40? to +85?. + denotes lead-free and rohs-compliant. quick start recommended equipment before beginning, the following equipment is needed: max6651 ev system: max6651 ev kitmaxim cmaxqusb interface board (usb cable included) a user-supplied windows 98se/2000/xp computerwith a spare usb port a 12vdc power supply note: in the following sections, software-related items are identified by bolding. text in bold refers to items directly from the ev kit software. text in bold and underlined refers to items from the windows 98se/2000/xp operating system. downloaded from: http:///
evaluate: max6651 procedure the max6651 ev kit is fully assembled and tested.follow the steps below to verify board operation. caution: do not turn on the power supply until all connections are completed. 1) visit the maxim website (www.maxim-ic.com/evkit- software) to download the latest version of the evkit software, 6651rxx.zip. 2) install the max6651 evaluation software on your computer by running the install.exe program.the program files are copied and icons are created in the windows start menu. 3) on the cmaxqusb board, ensure the shunt of jumper ju1 is in the 5v position. 4) carefully connect the boards by aligning the 20-pin connector of the max6651 ev kit with the 20-pinheader of the cmaxqusb interface board. gently press them together. 5) also connect the 12vdc supply to the max6651 ev kit at the pad labeled fan supply (? (themax6651 s +5v supply comes from the cmaxqusb board). 6) ensure that the jumper settings are in the default position (table 1). 7) connect a 12v tachometer-output fan to the fan0+, fan0-, and fan0t terminals. additionalfans 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. 8) connect the usb cable from the pc to the cmax- qusb board. a building driver database window pops up in addition to a new hardware found message. if you do not see a window that is similarto the one described above after 30 seconds, remove the usb cable from the cmaxqusb and reconnect it. administrator privileges are required to install the usb device driver on windows 98se/2000/xp. refer to the troubleshoot- ing_usb.pdf document included with the software if you have any problems during this step. 9) follow the directions of the add new hardware wizard to install the usb device driver. choose the search for the best driver for your device option. specify the location of the device driver to be c:\ program files\max6651 (or the directory cho- sen during installation) using the browse button. 10) turn on the power supply. the fan will turn on at full speed. 11) start the max6651 program by opening its icon in the windows start menu. 12) click the registers panel at the top of the program. in the config register, drop down the full-on combo box and choose closed-loop mode. 13) in the speed register, type in the value "100." adjust this value up or down to choose the targetfan speed. increasing the speed value makes the closed-loop set point a slower fan speed. 14) observe measured fan speed in the tach0 tachometer display. detailed description of software the main window (figure 1) shows a block diagram ofthe max6651 ev kit, which allows the user to configure the fan mode and speed . the registers tab (figure 2) shows the register values of the max6651. registerbit fields are presented as drop-down combo boxes. the speed and tach0-3 register values are also trans- lated into the corresponding fan (rpms). detailed description of hardware u1, the max6651, is an intelligent fan controller. mos-fet 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. pcb layout tips for best results, keep the q1 gate drive trace as shortas possible. see figure 3, which shows the max6651 ev kit schematic, and refer to the max6651 ic data sheet. max6651 evaluation kit/evaluation system 2 _______________________________________________________________________________________ downloaded from: http:///
evaluate: max6651 max6651 evaluation kit/evaluation system _______________________________________________________________________________________ 3 figure 1. max6651 ev kit software main window (block diagram tab) downloaded from: http:///
evaluate: max6651 max6651 evaluation kit/evaluation system 4 _______________________________________________________________________________________ figure 2. max6651 ev kit software main window (registers tab) downloaded from: http:///
evaluate: max6651 max6651 evaluation kit/evaluation system _______________________________________________________________________________________ 5 jumper position function 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 disconnect on-board led from gpio0 output. closed connect gpio0 to gpio1. j7 open* gpio0 is not connected to gpio1. closed* fan 3 tachometer connects to fan3t directly. j8 open fan 3 tachometer connects to fan3t through 49.9k resistor r8. closed* fan 2 tachometer connects to fan2t directly. j9 open fan 2 tachometer connects to fan2t through 49.9k resistor r7. closed* fan 1 tachometer connects to fan1t directly. j10 open fan 1 tachometer connects to fan1t through 49.9k resistor r6. closed* fan 0 tachometer connects to fan0t directly. j11 open fan 0 tachometer connects to fan0t through 49.9k resistor r5. closed* fb feedback input connects to q1 drain directly. j12 open fb feedback input connects to q1 drain through 49.9k resistor r4. table 1. jumper functions 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 table 2. address selection jumpers * default position. * default position. downloaded from: http:///
evaluate: max6651 max6651 evaluation kit/evaluation system 6 _______________________________________________________________________________________ gpio 0 vcc gpio 1 gpio 2 gpio 3 gpio 4 p1-2 p1-4 p1-6 p1-8 p1-10 p1-12 p1-14 p1-16 p1-18p1-20 p1-1p1-3 p1-5 p1-7 p1-9 p1-11 p1-13p1-15 p1-17 p1-19 scl sda vcc r3 560 led1 j5 vcc c3 0.1 f r1 10k 1% r2100k 1% j2 j3 j4 j1 vcc 6 j7 c110 f 25v c2open r4 49.9k 1% r5 49.9k 1% r6 49.9k 1% r7 49.9k 1% r8 49.9k 1% rp1 10k ? 5 fan3+ fan3t fan3- fan2+ fan2t fan2- fan1+ fan1t fan1- fan0+ fan0t fan0- fan_supply+ fan_supply- gpio0 gpio1 gpio2 gpio3 gpio4 sda scl add gnd out 10 9 1112 75 vcc tach3 tach2 tach1 tach0 v cc max6651 u1 14 32 16 1 15 fb 841 3 q1 j12 j11 j10 j9 j8 figure 3. max6651 ev kit schematic downloaded from: http:///
evaluate: max6651 max6651 evaluation kit/evaluation system _______________________________________________________________________________________ 7 figure 4. max6651 ev kit component placement guide?omponent side figure 5. max6651 ev kit pcb layout?omponent side downloaded from: http:///
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 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. evaluate: max6651 max6651 evaluation kit/evaluation system 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 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. figure 6. max6651 ev kit pcb layout?older side revision history pages changed at rev 1: title change all pages, 1 5 downloaded from: http:///
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