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general description the MAX6639 evaluation kit (ev kit) is an assembled and tested pcb used to evaluate the MAX6639 dual tempera- ture sensor/fan controller. the MAX6639 monitors its own die temperature and the junction temperature of one external diode-connected transistor, or the junction tem- peratures of two external diode-connected transistors. it converts the temperature to 8-bit or 11-bit 2-wire serial data that can be accessed over a 2-wire serial bus. the MAX6639 ev kit includes both external diode-connect- ed transistors (2n3906) soldered to the board, which can be bypassed to connect the board through a twisted pair to remote diodes close to your system. the temperature data is also used by the internal dual pwm fan-speed controller to adjust the speed of up to two cooling fans. speed control is accomplished by tachometer feedback from the fan. the ev kit also includes windows 2000/xp- and windows vista -compatible software, which provides a simple user interface for exercising the features of the MAX6639. the program is menu-driven and offers a graphical user interface (gui) complete with control but- tons. the ev kit comes with the MAX6639aee+ installed. contact the factory for free samples of the pin-compatible MAX6639faee+ and max6640aee+. the MAX6639 ev kit also evaluates the max6640. the max6640 is not recommended for new designs. features two thermal-diode inputs local temperature sensor programmable temperature alarms two pwm outputs for fan drive up to 25khz pwm output frequency programmable fan-control characteristics 3-wire and 4-wire fan configurations on-board microcontroller to generate smbus/i 2 c commands usb-pc connection (cable included) windows 2000/xp- and windows vista (32-bit)-compatible software easy-to-use, menu-driven software lead(pb)-free and rohs compliant fully assembled and tested evaluates: MAX6639/MAX6639f MAX6639 evaluation kit ________________________________________________________________ maxim integrated products 1 19-4448; rev 0; 1/09 component list for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information designation qty description c1, c12, c14 3 10? ?0%, 16v x5r ceramic capacitors (0805) murata grm21br61c106k c2, c3 2 22pf ?%, 50v c0g ceramic capacitors (0603) murata grm1885c1h220j c4 1 0.033? ?0%, 25v x7r ceramic capacitor (0603) tdk c1608x7r1e333k c5?10 , c17, c18, c19 9 0.1? ?0%, 16v x7r ceramic capacitors (0603) tdk c1608x7r1c104k c11, c13, c22 3 1? ?0%, 16v x5r ceramic capacitors (0603) tdk c1608x5r1c105k c15, c16 2 10pf ?%, 50v c0g ceramic capacitors (0603) murata grm1885c1h100j designation qty description c20, c21 2 2200pf ?0%, 50v x7r ceramic capacitors (0603) murata grm188r71h222k d1, d2, d3 3 red leds (0603) d4 1 green led (0603) h1 0 not installed, dual-row (2 x 5) 10-pin jtag header j1, j2 2 3-pin headers, 0.1in pitch, vertical, friction lock j3, j4 2 4-pin headers, 0.1in pitch, vertical, friction lock ju1?u7 7 3-pin headers ju8?u13 0 not installed, 2-pin headersshorted by pcb trace l1 1 ferrite bead (0603) tdk mmz1608r301a part type MAX6639evkit+ ev kit + denotes lead(pb)-free and rohs compliant. windows and windows vista are registered trademarks of microsoft corp. smbus is a trademark of intel corp.
evaluates: MAX6639/MAX6639f MAX6639 evaluation kit 2 _______________________________________________________________________________________ component suppliers supplier phone website central semiconductor corp. 631-435-1110 www.centralsemi.com fairchild semiconductor 888-522-5372 www.fairchildsemi.com hong kong x?als ltd. 852-35112388 www.hongkongcrystal.com murata electronics north america, inc. 770-436-1300 www.murata-northamerica.com tdk corp. 847-803-6100 www.component.tdk.com note: indicate that you are using the MAX6639 when contacting these component suppliers. component list (continued) designation qty description n1, n2 2 n-channel mosfet, 1.4a, 30v (3 sot23) fairchild nds351an p1 1 usb type-b right-angle pc-mount receptacle q1, q2 2 2n3906-type pnp transistors (sot23) central semi cmpt3906 r1, r2 2 27 ?% resistors (0603) r3, r19, r20, r21 41.5k ?% resistors (0603) r4 1 470 ?% resistor (0603) r5 1 2.2k ?% resistor (0603) r6, r16, r18 3 10k ?% resistors (0603) r7 1 169k ?% resistor (0603) r8 1 100k ?% resistor (0603) r9?13 0 not installed, resistors?horted by pcb trace (0402) r14 1 47 ?% resistor (0603) r15, r17, r22, r23, r24 54.7k ?% resistors (0603) r25, r26, r27 0 not installed, resistors (0603) designation qty description r28 1 220 ?% resistor (0603) u1 1 temp sensor fan controller (16 qsop) maxim MAX6639aee+ u2 1 microcontroller (68 qfn-ep*) maxim maxq2000-rax+ u3 1 ldo regulator (5 sc70) maxim max8511exk25+ u4 1 adjustable output ldo regulator (5 sc70) maxim max8512exk+ u5 1 uart-to-usb converter (32 tqfp) u6 1 93c46 eeprom (8 so) y1 1 16mhz crystal (hcm49) hong kong x?als ssm1600000e18faf y2 1 6mhz crystal (hcm49) hong kong x?als ssl600000e18faf 7 shunts 1 usb high-speed a-to-b cable, 6ft 1 pcb: MAX6639 evaluation kit+ MAX6639 ev kit files * ep = exposed pad. file description install.exe installs the ev kit files on your computer MAX6639.exe application program ftd2xx.inf usb driver file uninst.ini uninstalls the ev kit software usb_driver_help.pdf usb driver installation help file
quick start recommended equipment a MAX6639 ev kit (usb cable included) a user-supplied windows 2000/xp- or windows vista-compatible pc with a spare usb port a power supply to power the fans (the voltage and current depend on the fans used, but the voltage must not exceed 30v) one or two 3-pin dc fans with tachometer outputs (each fan must not draw more than 1.4a continuous) 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 under - lined refers to items from the windows operating system. procedure the MAX6639 ev kit is fully assembled and tested. follow the steps below to verify board operation. caution: do not turn on power supply until all con- nections are completed. 1) visit www.maxim-ic.com/evkitsoftware to down- load the latest version of the ev kit software, 6639rxx.zip. save the ev kit software to a tempo- rary folder and uncompress the zip file. 2) install the ev kit software on your computer by run- ning the install.exe program inside the tempo- rary folder. the program files are copied and icons are created in the windows start | programs menu. 3) verify that all jumpers (ju1?u7) are in their default positions, as shown in table 1. 4) connect the fan(s) to j1 and j2 on the ev kit board. 5) connect the fan power supply to the pads labeled vfan and fan_gnd. 6) connect the usb cable from the pc to the ev kit board. a new hardware found window pops up when installing the usb driver for the first time. if a window is not seen that is similar to the one described above after 30s, remove the usb cable from the board and reconnect it. administrator priv- ileges are required to install the usb device driver on windows. evaluates: MAX6639/MAX6639f MAX6639 evaluation kit _______________________________________________________________________________________ 3 table 1. MAX6639 ev kit jumper description table (ju1?u7) jumper shunt position description 1-2* connects the MAX6639 to the on-board 3.3v supply ju1 2-3 connects the MAX6639 to the user-supplied 3.0v to 3.6v supply 1-2* connects the MAX6639 to the on-board scl ju2 2-3 connects the MAX6639 to the user-supplied scl 1-2* connects the MAX6639 to the on-board sda ju3 2-3 connects the MAX6639 to the user-supplied sda 1-2* connects the MAX6639 to the on-board alert ju4 2-3 connects the MAX6639 to the user-supplied alert 1-2* connects pin add of the MAX6639 to vcc. address = 0x5e. if the max6640 is used, always use this jumper in the 1-2 position. open pin add of the MAX6639 left unconnected. address = 0x5c. ju5 2-3 connects pin add of the MAX6639 to ground. address = 0x58. not allowed on the max6640. 1-2* connects the pullup resistor for the tach1 signal to the voltage vfan, which is used for 3-wire fans ju6 2-3 connects the pullup resistor for the tach1 signal of the MAX6639 to the voltage vin, which is used for 4-wire fans 1-2* connects the pullup resistor for the tach2 signal of the MAX6639 to the voltage vfan, which is used for 3-wire fans ju7 2-3 connects the pullup resistor for the tach2 signal of the MAX6639 to the voltage vin, which is used for 4-wire fans * default position.
evaluates: MAX6639/MAX6639f 7) 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\MAX6639 (default installation directory) using the browse button. during device driver installation, windows may show a warning message indicating that the device driver provided by maxim does not contain a digital signature. this is not an error condition and it is safe to proceed with installation. refer to the usb_driver_help.pdf document included with the software for additional information. 8) turn on fan power supply. 9) start the ev kit software by opening its icon in the start | programs menu. the ev kit software main window should appear as shown in figure 1. observe as the program automatically detects the address of the MAX6639 and starts the main program. detailed description of software user interface the user interface is easy to operate. each button cor- responds to bits in the command and configuration byte. by pressing them, the correct i 2 c-compatible write operation is generated to update the internal reg- isters of the MAX6639. automatic read the program polls the device for the new temperature and status data a maximum of two times per second (2hz). to disable the polling of data, uncheck the auto read checkbox located at the top of the program. data logging check the data logging checkbox located at the top of the program 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 the auto read checkbox is checked, data is sampled at 2hz. when the auto read checkbox is unchecked, the MAX6639 evaluation kit 4 _______________________________________________________________________________________ figure 1. MAX6639 ev kit software main window (temperature tab)
data is logged each time read all is selected from the options menu bar. to stop data logging, uncheck the data logging checkbox. temperature the MAX6639 monitors its own die temperature and the junction temperature of one external diode-connected transistor, or the junction temperature of two external diode-connected transistors. the temperature mea- surements are capable of either 8-bit or 11-bit (extend- ed) resolution; 8-bit resolution results in a temperature resolution of 1?/lsb. extended resolution results in a temperature resolution of 0.125?/lsb and is enabled by checking the enable extended resolution (0x05) checkbox (figure 1). read the temperatures by pressing the read buttons within the temperature tab sheet (figure 1). the tem- perature is shown to the right of the buttons. external diodes the MAX6639aee remote temperature sensor is opti- mized for use with a diode-connected transistor whose ideality factor is equal to 1.008. transistors with different ideality factors produce different remote temperature readings. some typical discrete transistors may produce readings that vary approximately 3? from the correct value. refer to application note 1057: compensating for ideality factor and series resistance differences between thermal sense diodes for additional information. alert , therm , and ot temperature limits the MAX6639 has alert , therm , and overtempera- ture ( ot ) limit registers. temperatures exceeding the alert limit register generate an alert interrupt. exceeding the therm or ot limits sets the therm or overtemperature bit in the status register and asserts the therm or ot output pin. read a limit by pressing the read button (figure 1). the value (in celsius) is shown to the right of the button. change a limit by entering the value (in celsius) into the appropriate edit field and pressing the write button. evaluates: MAX6639/MAX6639f MAX6639 evaluation kit _______________________________________________________________________________________ 5 figure 2. MAX6639 ev kit software main window (global configuration tab)
evaluates: MAX6639/MAX6639f fan-start temperature the minimum fan-start temperature register contains the temperature at which fan control begins. note: this applies only to automatic rpm mode. refer to the MAX6639 ic data sheet for more information on auto- matic rpm mode operation. read the minimum fan-start temperature by pressing the read button (figure 1). the value (in celsius) is shown to the right of the button. change the minimum fan-start temperature by entering the values (in celsius) into the edit boxes and pressing the write buttons. global configuration the global configuration register has several functions. figure 2 displays the checkboxes that configure the register. each checkbox corresponds to a bit in the register. table 2 describes the function of each check- box. read the global configuration register by pressing the read button. change the global configuration reg- ister by checking or unchecking the desired function checkbox and pressing the write button. mask the mask register enables or disables the alert , ot , therm , or fanfail outputs. figure 3 displays the checkboxes that configure the register. each checkbox corresponds to a bit in the register. table 3 describes the function of each checkbox. read the mask register by pressing the read button. change the mask by selecting or deselecting the desired masks and press- ing the write button. status the status (0x02) group box displays the critical and fault conditions that occur. each line corresponds to a bit in the registers. see table 4 for a list of the status conditions. read the status by pressing the read status button within the status (0x02 ) group box. fan 1 and fan 2 configuration 1 the fan 1 configuration 1 (0x10) and fan 2 configuration 1 (0x14) group boxes control the modes of operation of the fans (figure 4). the configuration 1 (0x14) group box is not shown, but can be accessed by navigating to the fan 2 tab sheet from figure 4. these group boxes contain four items: mode , rate of change , control , and rpm range . the mode drop-down list has two options: pwm mode or rpm mode . select pwm mode to control the pwm duty cycle manually. rpm mode allows for either man- ual or automatic control of the fan? rpm. the rate of change drop-down list sets the time between adjustments of the duty cycle. each adjust- ment is 1/120 of the pwm period. by adjusting the rate MAX6639 evaluation kit 6 _______________________________________________________________________________________ table 2. global configuration register checkboxes bit name state description checked places the MAX6639 in software standby mode 7 stop unchecked* places the MAX6639 in operational mode checked resets all registers to their default values, including the global configuration register. after selecting the por checkbox, the checkbox returns to the unchecked state. 6 por unchecked* normal operation checked* enables the smbus timeout 5 smb timeout enabled unchecked disables the smbus timeout, as well as the alert response, thus providing true i 2 c compatibility checked* the local sensor on the MAX6639 is the source for channel 2 4 channel 2 source = local unchecked the remote sensor connected to dxp2 and dxn is the source for channel 2 checked enables high-frequency pwm output on the MAX6639 3 high-freq enabled (MAX6639 only) unchecked* enables low-frequency pwm output 2 reserved n/a not used 1 reserved n/a not used 0 reserved n/a not used * power-on-reset (por) state.
of change drop-down list, audibility of fan-speed changes can be traded for response time. there are eight possible options: 0s , 0.0625s , 0.125s , 0.25s , 0.5s , 1s , 2s , or 4s . the control drop-down list sets the temperature chan- nels that control the fan in rpm mode. there are four options under the control drop-down list: none , channel1 , channel2 , or both . selecting none allows for manual control of the fan? rpm. selecting channel1 , channel2 , or both , allows the fan? rpm to be con- trolled by the temperature of the selected channel(s). the rpm range drop-down list scales the tachometer counter by setting the maximum (full-scale) value of the rpm range. there are four possible selections: 2000 rpm , 4000 rpm , 8000 rpm , or 16000 rpm . select the closest value that is greater than the fan? full-speed rpm. read the configuration 1 register by pressing the read button. change the configuration by selecting the desired options and pressing the write button. fan 1 and fan 2 configuration 2a the fan 1 configuration 2a (0x11) and fan 2 configuration 2a (0x15) group boxes apply to the automatic rpm mode (figure 4). the configuration 2a (0x15) group box is not shown, but can be accessed by navigating to the fan 2 tab sheet from figure 4. these group boxes contain four items: rpm step-size a , temp step-size , positive pwm polarity , and min. speed . the rpm step-size a drop-down list selects the number of tachometer counts that the target value decreases for each temperature-step increase above the fan-start temperature. the value can be set between 1 and 16. the temp step-size drop-down list selects the temper- ature adjustment for fan control. for each temperature- step increase, the target tachometer count decreases by the value of rpm step-size a. the temperature step- size value can be set to 1 c , 2 c , 4 c , or 8 c . the positive pwm polarity checkbox sets the pwm output polarity. checking the positive pwm polarity evaluates: MAX6639/MAX6639f MAX6639 evaluation kit _______________________________________________________________________________________ 7 figure 3. MAX6639 ev kit software main window (mask tab)
evaluates: MAX6639/MAX6639f checkbox results in the pwm output being high at 100% duty cycle. unchecking the positive pwm polarity checkbox results in the pwm output being low at 100% duty cycle. the min. speed drop-down list selects the value of the minimum fan speed (when the temperature is below the fan-start temperature in the automatic rpm mode). there are two possible selections: 0% duty cycle or set by start tach . selecting 0% duty cycle results in the fan being off when the temperature is below the fan-start temperature value. selecting set by start tach (0x22) or set by start tach (0x23) results in the fan operating at the minimum speed set for fan 1 or fan 2. read the configuration 2a register by pressing the read button. change the configuration by selecting the desired options and pressing the write button. fan 1 and fan 2 configuration 2b the fan 1 configuration 2b (0x12) and fan 2 configuration 2b (0x16) group boxes also apply to the automatic rpm mode (figure 4). the configuration 2b (0x16) group box is not shown, but can be accessed by navigating to the fan 2 tab sheet from figure 4. these group boxes set the tachometer step sizes and number of steps for step-size a to step-size b slope changes. the rpm step-size b drop-down list selects the number of tachometer counts that the target value decreases for each temperature-step increase above the fan-start temperature. the value can be set between 1 and 16. the number of steps drop-down list sets the number of temperature/tachometer steps above the fan-start temperature at which step-size b begins. the number of steps can be set between 1 and 16. read the config- uration 2b register by pressing the read button. change the configuration by selecting the desired options and pressing the write button. fan 1 and fan 2 configuration 3 the fan 1 configuration 3 (0x13) and fan 2 configuration 3 (0x17) group boxes control fan spin- up, therm to fan full speed, pulse stretching, and pwm output frequency (figure 4). the configuration 3 (0x17) group box is not shown, but can be accessed by navigating to the fan 2 tab sheet from figure 4. the fan spin-up feature ensures that the fan starts. whenever the fan starts up from zero drive, it is driven with 100% duty cycle for 2s to ensure that it starts. fan spin-up is enabled by default. to disable this feature, check the fan spin up disable checkbox. when the therm to fan full speed checkbox is checked, therm going low?ither by being pulled low MAX6639 evaluation kit 8 _______________________________________________________________________________________ table 3. mask register checkboxes bit name state description checked disables the channel 1 alert interrupts 7 channel 1 alert mask unchecked* enables the channel 1 alert interrupts checked disables the channel 2 alert interrupts 6 channel 2 alert mask unchecked* enables the channel 2 alert interrupts checked prevents ot from being asserted by channel 1 fault 5 channel 1 ot mask unchecked* allows ot to be asserted by channel 1 fault checked prevents ot from being asserted by channel 2 fault 4 channel 2 ot mask unchecked* allows ot to be asserted by channel 2 fault checked prevents therm from being asserted by channel 1 fault 3 channel 1 therm mask unchecked* allows therm to be asserted by channel 1 fault checked prevents therm from being asserted by channel 2 fault 2 channel 2 therm mask unchecked* allows therm to be asserted by channel 2 fault checked* prevents fanfail from being asserted by channel 1 fault 1 fan 1 fault mask unchecked allows fanfail to be asserted by channel 1 fault checked* prevents fanfail from being asserted by channel 2 fault 0 fan 2 fault mask unchecked allows fanfail to be asserted by channel 2 fault * power-on-reset (por) state.
evaluates: MAX6639/MAX6639f MAX6639 evaluation kit _______________________________________________________________________________________ 9 figure 4. MAX6639 ev kit software main window (fan controls | fan 1 | configuration tab) table 4. status register bit name description 7 channel 1 alert the temperature of channel 1 is above the value set in the channel 1 alert limit register. 6 channel 2 alert the temperature of channel 2 is above the value set in the channel 2 alert limit register. 5 channel 1 ot the temperature of channel 1 has exceeded the value set in the channel 1 ot limit register. this bit returns to zero when the temperature of channel 1 drops 5? below the channel 1 ot limit. 4 channel 2 ot the temperature of channel 2 has exceeded the value set in the channel 2 ot limit register. this bit returns to zero when the temperature of channel 2 drops 5? below the channel 2 ot limit. 3 channel 1 therm the tem p er atur e of channel 1 has exceed ed the val ue set i n the channel 1 the rm l i m i t r eg i ster . thi s b i t r etur ns to zer o w hen the tem p er atur e of channel 1 d r op s 5c b el ow the channel 1 the rm l i m i t. 2 channel 2 therm the tem p er atur e of channel 2 has exceed ed the val ue set i n the channel 2 the rm l i m i t r eg i ster . thi s b i t r etur ns to zer o w hen the tem p er atur e of channel 2 d r op s 5c b el ow the channel 2 the rm l i m i t. 1 fan 1 fault a fault has been detected on fan 1. refer to the MAX6639 ic data sheet for a detailed description. 0 fan 2 fault a fault has been detected on fan 2. refer to the MAX6639 ic data sheet for a detailed description.
evaluates: MAX6639/MAX6639f MAX6639 evaluation kit 10 ______________________________________________________________________________________ figure 5. MAX6639 ev kit software main window (fan controls | fan 1 | tachometer tab) externally or by the temperature exceeding the therm limit?orces the fan to full speed at the rate determined by the rate-of-change setting in configuration 1. pulse stretching is used with a pulse-modulated power supply powering the fan. when modulating the fan? power supply with the pwm signal, the pwm pulses are periodically stretched to keep the tachometer? signal available for one full revolution. check the pulse stretching disable checkbox to disable this feature. always disable pulse stretching when using 4-wire fans. the pwm frequency drop-down list sets the frequen- cy that drives the pulse-modulated power supply. the frequency can be set to 20hz , 33.33hz , 50hz , or 100hz . if the high freq. enabled (MAX6639 only) checkbox is checked within the global configuration tab sheet, then the frequency can be set to 5khz , 8.33khz , 12.5khz , or 25khz . read the configuration 3 register by pressing the read button. change the configuration by selecting the desired options and pressing the write button. fan 1 and fan 2 tachometer count the fan 1 tachometer count (0x20) and fan 2 tachometer count (0x21) group boxes control the dif- ferent tachometer counts (figure 5). the tachometer count (0x21) group box is not shown, but can be accessed by navigating to the fan 2 tab sheet from figure 5. the tachometer count value is inversely pro- portional to the fans?speed. read the tachometer count by pressing the read button. fan 1 and fan 2 start or target tachometer count the fan 1 start or target tachometer count (0x22) and fan 2 start or target tachometer count (0x23) group boxes set either the starting tachometer count for the fan when operating in automatic rpm mode, or the target tachometer count when operating in manual rpm mode (figure 5). the start or target tachometer count (0x23) group box is not shown, but can be accessed by navigating to the fan 2 tab sheet from figure 5. read the count by pressing the read button.
evaluates: MAX6639/MAX6639f MAX6639 evaluation kit ______________________________________________________________________________________ 11 change the count by entering the value into the tachometer count edit box and pressing the write button. fan 1 and fan 2 pulses per revolution and min tach count the fan 1 pulses per revolution and min tach count (0x24) and fan 2 pulses per revolution and min tach count (0x25) group boxes set the number of tachome- ter pulses per revolution of the fan and the minimum allowable tachometer count (maximum speed) for the fan (figure 5). the pulses per revolution and min tach count (0x25) group box is not shown, but can be accessed by navigating to the fan 2 tab sheet from figure 5. the tach. pulses per rev. drop-down list setting has four options: 1 , 2 , 3 , or 4 . the min tachometer count edit box can be set to any value between 0 and 63. read the pulses per revolu- tion and minimum tachometer count by pressing the read button. change the pulses per revolution by selecting the desired number from the drop-down list. change the minimum tachometer count by entering the value into the edit box. press the write button to apply the changes. fan 1 and fan 2 duty cycle the duty cycle tab sheet (figure 6) contains the pwm duty cycle value. when operating in rpm mode, this value is controlled by the MAX6639. in pwm mode, this is the desired (target) pwm duty-cycle value. the value can be set between 0 and 120. any number above 120 is changed to 120. read the duty-cycle value by pressing the read but- ton. change the duty cycle by entering the value into the edit box and pressing the write button. alert the message alert appears in the alert box when an interrupt condition occurs, unless the configuration reg- ister is set to mask the alert. the cause of the interrupt is shown in the status (0x02) group box. to clear the interrupt, first eliminate the condition that caused it and then press the read alert button. figure 6. MAX6639 ev kit software main window (fan controls | fan 1 | duty cycle tab)
evaluates: MAX6639/MAX6639f save settings the MAX6639 ev kit software allows the user to save desired gui settings by selecting file | save settings from the menu bar. gui setting files can be saved only as .ini files. load settings to restore a saved gui setting, select file | load settings from the menu bar. next, select the .ini file with the desired gui settings and observe as the gui reconfigures appropriately. advanced user interface there are two methods for communicating with the MAX6639, through the normal user-interface main win- dow or through the smbus/i 2 c commands available by selecting options | interface (advanced users) from the menu bar. an advanced user interface window pops up with the 2-wire interface tab selected, which allows the smbus/i 2 c-compatible protocols, such as read byte and write byte, to be executed. the only smbus/i 2 c-compatible protocols used by the MAX6639 are: 1 - smbuswritebyte(addr,cmd,data8) 4 - smbusreadbyte(addr,cmd) -> data8 the combo and edit boxes accept numeric data in hexadecimal and should be prefixed by 0x. see figure 7 for an example of this tool. in this example, the software is reading from device address 0101111 r/w (binary), and register address 0x00. MAX6639 evaluation kit 12 ______________________________________________________________________________________ figure 7. simple smbusreadbyte operation using the advanced user interface
detailed description of hardware the MAX6639 ev kit is an assembled and tested pcb used to evaluate the MAX6639 dual-temperature sen- sor/fan controller. the MAX6639 monitors its own die temperature and the junction temperature of one exter- nal diode-connected transistor, or the junction tempera- tures of two external diode-connected transistors. it converts the temperature to 8-bit or 11-bit 2-wire serial data that can be accessed over a 2-wire serial bus. slave address the slave address can be changed by moving jumper ju5. see table 1 for address selection. 3-wire and 4-wire fan configurations the MAX6639 ev kit is configured for a 3-wire fan by default when the shunts are placed in the 1-2 position of jumpers ju6 and ju7. for 4-wire fan configuration, the user must move the shunts to the 2-3 position of jumpers ju6 and ju7. replacing diodes jumpers ju11 and ju12 connect the 2n3906 transistor as the external diodes. to use different diodes, cut the trace, short the two pins of ju11 and ju12, and con- nect the diodes (through twisted-pair wire) to the dxp1, dxn, and dxp2 pads. user-supplied i 2 c interface to use the MAX6639 with a user-supplied i 2 c interface, first move ju2, ju3, and ju4 to the 2-3 position. then, connect scl, sda, and alert to the corresponding pads on the MAX6639 ev kit. user-supplied power supply the MAX6639 ev kit is powered completely from the usb port by default. move the shunt of ju1 to the 2-3 position and apply a user-supplied 3.0v to 3.6v power supply at the ext_vin and gnd pads. the fan supply is provided by the user and varies depending on different fans. evaluates: MAX6639/MAX6639f MAX6639 evaluation kit ______________________________________________________________________________________ 13
evaluates: MAX6639/MAX6639f MAX6639 evaluation kit 14 ______________________________________________________________________________________ figure 8a. MAX6639 ev kit schematic (sheet 1 of 2)
evaluates: MAX6639/MAX6639f MAX6639 evaluation kit ______________________________________________________________________________________ 15 figure 8b. MAX6639 ev kit schematic (sheet 2 of 2)
evaluates: MAX6639/MAX6639f MAX6639 evaluation kit 16 ______________________________________________________________________________________ figure 9. MAX6639 ev kit component placement guide?omponent side
evaluates: MAX6639/MAX6639f MAX6639 evaluation kit ______________________________________________________________________________________ 17 figure 10. MAX6639 ev kit pcb layout?omponent side
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 18 __________________ maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. evaluates: MAX6639/MAX6639f MAX6639 evaluation kit springer figure 11. MAX6639 ev kit pcb layout?older side

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