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general description the max31790 evaluation kit (ev kit) provides the hard - ware and software graphical user interface (gui) neces - sary to evaluate the max31790 6-channel pwm-output fan rpm controller. the ev kit includes a max31790ati+ installed, as well as a usb-to-i 2 c interface. the usb-to-i 2 c master section on the ev kit labeled maxim ds3900u hid can be used to interact with the ev kit software and exercise the devices functionality. the ev kit provides headers and test points to connect user-supplied fans, but does not come with a fan included. ev kit contents assembled circuit board including the max31790ati+ and usb-to-i 2 c circuitry mini-usb cable features easy evaluation of the max31790 usb hid interface windows xp ? -, windows vista ? -, and windows ? 7-compatible software rohs compliant proven pcb layout fully assembled and tested 19-6552; rev 0; 12/12 ordering information appears at end of data sheet. ev kit photo windows, windows xp, and windows vista are registered trademarks and registered service marks of microsoft corporation. max31790 evaluation kit evaluates: max31790
maxim integrated 2 component list designation qty description b1 1 green banana jack deltron 571-0500 b2 1 black banana jack deltron 571-0100 b3 1 yellow banana jack deltron 571-0700 c1 1 0.1f 10%,100v x7r ceramic capacitor (0805) tdk cga4j2x7r2a104k c1i, c6i, c7i, c11i, c13i 5 0.1f 10%, 25v x7r ceramic capacitors (0603) tdk c1608x7r1e104k c2i, c5i 2 4.7f 10%, 6.3v x5r ceramic capacitors (0603) tdk c1608x5r0j475k c3 1 4.7f 10%, 50v x5r ceramic capacitor (0805) tdk cga4j3x5r1h475k c3i, c9i, c10i, c12i 4 1.0f 10%, 16v x7r ceramic capacitors (0603) murata grm188r71c105k c4 1 6.8f 20%, 50v tantalum capacitor (2812) vishay 595d685x0050c2t c4i, c8i 2 0.01f 10%, 50v ceramic capacitors (0603) murata grm188r71h103k c8, c9 2 12pf 05%, 100v ceramic capacitors (0805) avx 08051a120jat2a c14i 1 220nf 10%, 10v x7r ceramic capacitor (0603) tdk c1608x7r1a224k d1i 1 red led (1206) knightbright aptr3216ec d2i 1 dual led (0805) kingbright aphbm2012surkcgkc d3i 1 schottky diode (mini2-f1) panasonic-ssg db2w31900l d7, d8 2 red leds (1206) knightbright aptr3216ec designation qty description j1, j101, j201, j301, j401, j501, j601 7 2-pin headers, 2.54mm pitch 3m 961102-6404-ar j1i 1 usb_ 5-pin female header molex 54819-0519 j2Cj4, j7, j8 5 3-pin headers, 2.54mm pitch 3m 961103-6404-ar j2i, j3i 2 solder bridges j5, j6 2 8-pin (2 x 4) headers, 2.54mm pitch 3m 961208-6404-ar j11 1 5-pin bnc te connector amp 5227161-1 j100, j200, j300, j400, j500, j600, j700, j800, j900, j1000, j1100, j1200 12 4-pin headers, 2.54mm pitch 3m 961104-6404-ar q1i 1 nmos (sot323) on semi nts4001nt1g r1Cr4, r101, r103, r201, r203, r301, r303, r401, r403, r501, r503, r601, r603 16 4.7k? 1% resistors (0805) vishay crcw08054k70fkea r1i, r7i, r8i 3 330? 1% resistors (0603) vishay crcw0603330rfkea r2i, r3i 2 24.9? 1% resistors (0603) vishay crcw060324r9fkea r4i 1 100k? 1% resistor (0603) vishay crcw0603100kfkea r5, r6 2 1.21k? 1% resistors (0805) vishay crcw08051k20fkea r5i, r6i 2 10k? 1% resistors (0603) vishay crcw060310k0fkea max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 3 component list (continued) * ep = exposed pad. max31790 ev kit files note: the .exe file is downloaded as a .zip file. quick start required equipment max31790 ev kit user-supplied windows xp, windows vista, or windows 7 pc with usb port mini-usb cable (included) ev kit hardware (included) user-supplied 3.3v power supply (300ma minimum) user-supplied 12v vfan power supply user-supplied dc fan 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. setup procedure the ev kit is fully assembled and tested. follow the steps below to verify board operation: 1) place the ev kit hardware on a nonconductive surface to ensure that nothing on the pcb gets shorted to the workspace. 2) ensure that jumper/shunt j1 is installed, which provides power to the device. 3) check the following startup configuration jumpers/ shunts, which result in the associated behavior: a. j8 (pwm_star t1) = gnd and j7 (pwm_ start0) = vcc. defines a power-on-reset (por) pwm duty cycle of 75%. b. j2 (freq_star t) = vcc. defines a por pwm frequency of 25khz. c. j3 (spin_star t) = vcc. defines the por spin- up behavior for 100% duty cycle until two tachom - eter pulses or 1s (max). d. j4 (watchdog_start) = gnd. defines a disabled i 2 c watchdog on por. e. j5 (add0) = gnd and j6 (add1) = gnd. defines a por slave address of 40h. designation qty description r7Cr10, r100, r200, r300, r400, r500, r600 10 0? 1% resistors (0805) vishay crcw0805000rfkea r9i 1 2.2k? 1% resistor (0603) vishay crcw06032k20fkea r10i 1 4.7k? 1% resistor (0603) vishay crcw06034k70fkea r11 1 100? 10% resistor (0805) vishay crcw0805100rfkea tp1Ctp5, tp22Ctp28, tp40Ctp57 30 white test points keystone 5012 tp6Ctp8, tp30Ctp35 9 black test points keystone 5011 tp29 1 red test point keystone 5010 tp37 1 yellow test point keystone 5014 designation qty description u1 1 fan controller (28 tqfn-ep*) maxim max31790ati+ u1i 1 current-limit switch (5 sot70) maxim max4787exk+ u2i 1 linear regulator (5 sot23) maxim max8868euk33+ u3i 1 usb transceiver (16 tssop) maxim max3344eeue+ u4i 1 fxma108 fairchild fxma108bqx u5i 1 pic microchip pic18lf2550-i/so x1 1 12pf crystal epson c-002sh 32.7680ka-a x1i 1 4-pin cmos oscillator avx kc3225a48.0000c30e00 1 pcb: max31790 6 fan controller, 12 fan monitor file description MAX31790EVKITsoftware.exe application program max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 4 4) ensure that jumpers/shunts j101, j201, j301, j401, j501, and j601 are installed, which connects the asso - ciated pwmout signal to the fan1Cfan6 headers. 5) connect a 3.3v power supply to the vcc and gnd banana jacks. 6) connect a 12v power supply to the vfan and gnd banana jacks. 7) prior to starting the gui, connect the ev kit hard - ware to a pc using the supplied mini-usb cable, or equivalent. the com led (d2l) should be red and slowly flash orange. 8) windows should automatically begin installing the necessary device driver. the usb interface of the ev kit hardware is configured as an hid device and therefore does not require a unique/custom device driver. once the driver installation is complete, a windows message appears near the system icon menu indicating that the hardware is ready to use. do not attempt to run the gui prior to this message. if you do, then you must close the application and restart it once the driver installation is complete. on some versions of windows, administrator privileges may be required to install the usb device. 9) once the device driver installation is complete, visit www.maximintegrated.com/evkitsoftware to download the latest version of the ev kit software, MAX31790EVKITsoftware.zip. save the ev kit soft - ware to a temporary folder. 10) open the .zip file and extract the .exe file to your desired location. the .exe file is the actual ev kit gui and not an install program. you can store the .exe wherever you like and then uninstall it later by simply deleting the .exe file. 11) double-click on the .exe file to run the gui. a message box stating the publisher could not be verified. are you sure you want to run this soft - ware? may appear. if so, click run. 12) when the gui appears, proper communication to the usb-to-i 2 c master is indicated in the lower right corner below the status box by a text string stating ds3900 connected . the com led (d2l) now turns off and flashes red when communication occurs. 13) to verify communication to the device, with the default jumper/shunt settings described in steps 2C4, press the updatedashboard button on the top right corner and verify the pwm frequency updates to 25khz and all duty cycle values update to 75.15%, as shown in figure 1. this completes the ev kit setup. the hardware and software are ready to begin evaluating the device. if any issues arise, see the troubleshooting section. detailed description of software gui status box on the bottom right side of the gui is the status group box. it is used to relay information to the user and is cleared with the associated clear button. the text box below the status label indicates the status of the com- munication between the gui and the ev kit hardware. if everything is working properly, a message indicates ds3900 connected ; otherwise, the display shows a yield sign and ds3900 disconnected!! device confguration upon successful completion of the setup procedure, the user is ready to begin evaluation of the device. the devices por behavior is set by the power-up configura - tion pins and the default por values, as defined in the max31790 ic data sheet. the usb-to-i 2 c master com- municates to the slave id (hex) shown in the dashboard in the upper right side of the gui. to change the target slave address, enter the new value into the input field and press the set button. max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 5 figure 1. max31790 ev kit gui (main tab) max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 6 figure 2. max31790 ev kit gui (fanchannel1 tab) max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 7 figure 3. max31790 ev kit gui (fan faults tab) max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 8 reads each register of the device can be read from the gui by the simple press of the associated read button. the registers are located in one of the tabs as defined below: main tab (figure 1): global configuration register pwm frequency register fanchannel1C6 tabs (figure 2): fan n configuration register (where n denotes the channel) fan n dynamics register tach n count register pwmout n duty cycle register pwmout n target duty cycle register tach n target duty cycle register window n register fan faults tab (figure 3): fan fault status 1 register fan fault status 2 register fan fault mask 1 register fan fault mask 2 register failed fan options/sequential start register pressing a read button performs a single read of the register(s) and updates the associated data fields. there is also an option to do continuous reads of the device. this autoread feature is located in the upper right section of the gui. to start polling at a 1hz frequency, press the start autoread button. each poll reads all registers shown in the dashboard and the active tab then updates the associated data fields. once the continuous reads start, the button text changes to stop autoread for the user to stop the reads. it is not recommended to change register parameters through a write while autoread is enabled. the gui provides a very simple way to dump all the device registers to a text (.txt) file. under the main tab sheet, press the register dump button and provide a folder and file name. an example of a register dump is shown in figure 4. figure 4. max31790 data table max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 9 writes each register of the device can be written to/from the gui either by the simple click on the radio button or the input of a decimal value followed by a press of the associated write button. the writable registers are located in one of the tabs, as defined in the previous reads section. clicking on any radio button or drop-down list automati - cally writes the selected value to the device. to verify a successful write, perform a read that then updates the field. to write a register that requires a numerical value, such as tach n target count or pwmout n target duty , enter the decimal value desired for the non- reserved data bits of the registers. for example, to write pwmout 1 target duty cycle to a value of 39%, or 200 decimal (refer to the max31790 ic data sheet for bit weighting), click on the fanchannel1 tab and enter 200 in the input box located to the left of the pwmout 1 target duty cycle(40-41h) label and press the write (40-41h) button. this writes 64h to register 40h and 00h to register 41h. verify the write by pressing the read pwm register button. the gui provides a very simple way to load all the device registers from a text (.txt) file. under the main tab sheet, press the register load button and provide a previously saved register dump file or a modified version of a previous dump. the register load file must have the same format as the gui-generated dump file. general i 2 c tab the gui provides a generic i 2 c tab (i2cmemory), which is not required to evaluate the device. use this tab if a more flexible i 2 c transaction is required. full_speed input signal control the gui provides a method to control the full_speed input to the device. on the right side of the gui in the dashboard group box, there is a full_speed# section with two radio buttons that toggles the logic level of this signal between high and low. fan_fail output signal monitor the gui provides a method to monitor the fan_fail output of the device. in the dashboard group box, there is a fan_fail# pin section that changes to reflect the logic level of this signal. detailed description of hardware user-supplied fans the max31790 ev kit provides the flexibility to control the speeds of up to six fans or monitor up to 12 fans. the ev kit contains 12 fan headers (100 mil spacing) that fans connect to. refer to the max31790 ic data sheet for various examples of fan configurations. connect fans to the correct gnd, vfan, tach, and pwm headers. in a closed-loop fan-control configuration on fan1Cf an6, the jumper/shunt pwmn/fann (j101, j201, j301, j401, j501, and j601) must be populated. this connects the pwm signal from the device to the fan header. to use pwm outputs as tachometer inputs, open-loop monitor configuration, on fan channel 1 for example, remove the jumper/shunt on pwm1/fan1 (j101) and attach a fan to the fan1/fan7 headers. connect the desired pwm signal for fan1 to the pwm1 header and connect the desired pwm signal for fan7 to the pwm7 test point. properly configure the device through the i 2 c port to reflect the hardware configuration. user-supplied i 2 c interface the usb-to-i 2 c master section of the ev kit is not necessary for the proper operation of the device. if the user wants to supply the i 2 c interface, the usb-to- i 2 c master section of the ev kit can be disconnected by removing resistors r7 and r8. connect test points sda, scl, and gnd. the full_speed and fan_fail signals from the device can also be routed to a different master by removing resistors r9 and r10 and connecting to the full_spd, fan_fail , and gnd test points. change startup confguration jumpers all the startup configuration jumpers (j2Cj8) are located on the left side of the pcb and partitioned off by silk - screen labeled star tup configuration. refer to the max31790 ic data sheet for resulting device opera - tion. after changing jumper configurations, a device por or a setting of the reset bit in the global configuration register is required for new configurations to take effect. max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 10 table 1. hardware configurations table 2. description of leds hardware action components description connect user-supplied fan1Cfan6 j100, j200, j300, j400, j500, j600, connect a user-supplied fan to the correct gnd, vfan, tach, and pwm headers. connect user-supplied fan7Cfan12 j700, j800, j900, j1000, j1100, j1200 connect a user-supplied fan to the correct gnd, vfan, tach, and pwm headers. connect full_speed and fan_fail pins to user-supplied interface r9, r10 remove resistors r9 and r10 and connect to the full_spd and fan_fail test points. connect user-supplied i 2 c interface r7, r8 remove resistors r7 and r8 and connect to user-supplied i 2 c interface to test points. change startup confguration jumpers j2Cj8 adjust the jumper/shunt positions according to the silkscreen labels. led color description d1l (fault) red usb power fault: a fault occurred due to overvoltage limit, current limit, or thermal limit. d2l (com) red communication: after the software has initialized the hardware, the led fashes red when a command from the pc is received. off initialized: hardware has been initialized by software. red and flashing orange waiting: hardware is powered on and waiting for the software to be opened. d6 red full_speed: led connected to the active-low full_speed input. led turns red when the full_speed signal is logic-low. d7 red fan_fail: led connected to the active-low open-drain fan_fail output. led turns red when the fan_fail signal is logic-low. max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 11 troubleshooting all efforts were made to ensure that each ev kit works on the first try, right out-of-the-box. in the rare occasion that a problem is suspected, see table 3 to help troubleshoot the issue. table 3. troubleshooting symptom check solution gui indicates: hardware not found is the led labeled d1l red? if yes, then the electronic fuse is in a fault state. inspect for electrical shorts on the pcb and make sure that the pcb is not sitting on a conductive surface. does the led labeled d2l turn off when the gui is running? if not, then exit the gui and try running it again. if d2l still does not turn off, then exit the gui and power cycle the board by removing and reapplying the user-supplied power source. try connecting the usb cable to a different usb port on the pc and wait for a windows message that states that the hardware is ready to use. run the gui again. if d2l still does not turn off, unplug the usb cable and reboot the pc. connect the usb cable and open the gui. are any of the leds illuminated? if not, then the pcb may not be getting power from the user- supplied power supply. verify the power-supply bias with a voltmeter, measuring from vcc to gnd. valid levels are 3v to 5.5v. gui status indicates: error communicating with the max31790 slave address jumper confguration (j5, j6) check the current setting of the slave address jumper confgurations (j5, j6) and input the resulting slave address in the slave id (hex) input box, then pressing the set button. max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 12 figure 5a. max31790 ev kit schematic (sheet 1 of 4) r1 4.7k r2 4.7k r3 4.7k r4 4.7k r5 1.21k r6 1.21k d7 f anf ail d8 f ullspeed 1 2 3 j4 wd_start 1 2 3 j3 sp i n_start 1 2 3 j2 fr eq_start 1 2 3 j8 p wm_start1 1 2 3 j7 p wm_start0 tp 26 pw m_ st rt 1 1 b3 vf an vc c vc c gnd gnd vc c vc c gnd vc c gnd vc c gnd gnd gnd vc c vc c tp 25 pw m_ st rt 0 tp 1 fr q_ st rt tp 2 sp n_ s tr t tp 3 w d_st rt tp 4 add0 tp 5 add1 1 b1 vcc = 3.3v 1 b2 gn d 1 2 j1 vcc jum pe r c2 dnp c1 0.1uf gn d vc c x1 crystal 12pf + c4 4.7uf 50volt c3 4.7uf 50vo lt vf an 200 mi l trac e p wm_start1 p wm_start0 fr eq_start sp i n_start wd_start a dd1 a dd0 sda scl sda scl sda sc l f an_ fa il # fu ll _sp eed# tp 22 sda tp 23 scl tp 24 f an_ fa il # tp 27 fu ll _s pd # sd a sc l tp 6 gnd tp 8 gnd tp 7 gnd tp 30 gn d tp 31 gn d tp 32 gnd tp 33 gnd tp 29 vc c p wmout4 tach4 p wmout5 tach5 p wmout6 tach6 p wm_start0 p wm_start1 cl ko ut fr eq _s tart sp in _s tart wd _s tart a dd0 ad d1 pw mo ut 1 tach 1 pw mo ut 2 tach 2 pw mo ut 3 t a ch 3 tp 37 vf an tp 34 gnd tp 35 gnd sl ave addr= 40h - 5eh gnd redle ds tp 28 cl ko ut 1 2 j11 cl ko ut gnd r7 0 r8 0 r10 0 r9 0 c8 12pf c9 12p f gn d r11 100 vd ut gnddut f rq_strt: gnd = 30hz unconnected = 1.47 kh z vcc = 25kh z sp i n_strt: gnd = no sp in -u p unconnected = 0.5s max vcc = 1.0s ma x wd_strt: gnd = no watchdo g vcc = 30s p or cond it io n pwm_strt0 pwm_strt1 pwm duty cycl e (%) gnd gnd gnd unconnected 30 gnd vcc unconnected gnd 50 unconnected v cc 60 vcc gnd vcc vcc 1 2 3 4 5 6 7 8 j5 hdr_8p in 1 2 3 4 5 6 7 8 j6 hdr_8p in fr eq _s tart 1 s pi n_ s t ar t 2 xt al 2 6 ad d0 4 wd _s tart 5 ad d1 3 xt al 1 7 gnd 8 tach6 9 p wmout6 10 tahc5 11 p wmout5 12 tach4 13 p wmout4 14 tach 3 1 5 pw mo ut 3 16 tach 2 17 pw mo ut 2 18 tach 1 19 p w m o ut 1 20 vc c 21 sda 22 scl 23 f an_fa il 24 p wm_start0 25 p wm_start1 26 fu ll sp eed 27 cl ko ut 28 f r e q _ s t a r t s p i n _ s t a r t x t a l 2 a d d 0 w d _ s t a r t a d d 1 x t a l 1 gn d t a c h 6 p w mout 6 t ahc 5 p w mout 5 t a c h 4 p w m ou t 4 t a c h 3 p w m o u t 3 t a c h 2 p w m o u t 2 t a c h 1 p w m o u t 1 v c c s d a sc l f an _ f a i l p w m _ start 0 p w m _ start 1 f u l l s p ee d c l k ou t u1 max31790 sd a sc l fa n_ f ai l# fu ll _s pe ed # pw m_ st art0 pw m_ s tart1 cl ko ut fr eq_start sp i n_start wd_start add0 add1 pw mo ut 4 ta ch 4 pw mo ut 5 tach 5 pw mo ut 6 tach 6 gn d p wmout1 tach1 p wmout2 tach2 p wmout3 tach3 vdut t his is the through hole footprint for the s m placem ent on pc 1 2 3 4 5 6 7 j9a dnp (28 p in round db ) 8 9 10 11 12 13 14 j9 b 28 pi n round db 15 16 17 18 19 20 21 d j9 c 28 pi n round db 22 23 24 25 26 27 28 j9d 28 pi n round db fa n_ fa il # fu ll_s p eed # sda_pi c scl _p ic p7 p6 sl ave address sel ect pi ns configure power up sampled pi n a ddi ti on al te st po in ts ev ki t la yout note: use recom me nded p cb layout for cr y stal trace s max31790 circuitr y max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 13 figure 5b. max31790 ev kit schematic (sheet 2 of 4) r100 0 r103 4.7k r102 dnp r101 4.7k c101 dnp c100 dnp vc c gnd tp 40 tach1 vc c gnd tp 41 pw mout1 2 3 4 1 j100 fa n1 header 200 mi l trace vf an vf an tach1 pw mout1 1 2 j101 p wm1 2 3 4 1 j700 fa n7 he ad er tp 42 p wm7 d1 dn p (5 .5 v ze ne r) gnd tach7 p wm7 vf an gnd r200 0 r203 4.7k r202 dnp r201 4.7k c201 dnp c200 dnp vc c gnd tp 43 tach2 vc c gnd tp 44 p wmout2 2 3 4 1 j200 f an2 heade r 200 mi l trac e vf an vf an tach2 p wmout2 1 2 j201 p wm2 2 3 4 1 j800 fa n8 he ad er tp 45 p wm8 d2 dn p (5 .5v ze ne r ) gnd tach8 p wm8 vf an gnd r300 0 r303 4.7k r302 dnp r301 4.7k c301 dnp c300 dnp vc c gnd tp 46 tach3 vc c gnd tp 47 pw mout3 2 3 4 1 j300 fa n3 header 200 mi l trace vf an vf an tach3 pw mout3 1 2 j301 p wm3 2 3 4 1 j900 fa n9 he a de r tp 48 p wm9 d3 dn p (5 .5 v ze ne r) gnd tach9 p wm9 vf an gnd gnd gnd gnd fan 1 - 3 and 7 - 9 headers max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 14 figure 5c. max31790 ev kit schematic (sheet 3 of 4) r400 0 r403 4.7k r402 dnp r401 4.7k c401 dnp c400 dnp vc c gnd tp 49 tach4 vc c gnd tp 50 p wmout4 2 3 4 1 j400 f an4 header 200 mi l trace vf an vf an tach4 p wmout4 1 2 j401 p wm4 2 3 4 1 j1000 fa n1 0 he ad er tp 51 pw m1 0 d4 dn p (5 .5 v ze ne r) gnd tach10 pw m1 0 vf an gnd r500 0 r503 4.7k r502 dnp r501 4.7k c501 dnp c500 dnp vc c gnd tp 52 tach5 vc c gnd tp 53 p wmout5 2 3 4 1 j500 f an5 heade r 200 mi l trace vf an vf an tach5 p wmout5 1 2 j501 p wm5 2 3 4 1 j1100 fa n1 1 he a de r tp 54 pw m1 1 d5 dn p (5 .5 v ze ne r) gnd tach11 pw m1 1 vf an gnd r600 0 r603 4.7k r602 dnp r601 4.7k c601 dnp c600 dnp vc c gnd tp 55 tach6 vc c gnd tp 56 p wmout6 2 3 4 1 j600 f an6 header 200 mi l trac e vf an vf an tach6 p wmout6 1 2 j601 p wm6 2 3 4 1 j1200 fa n1 2 he ad er tp 57 pw m1 2 d6 dn p (5 .5 v ze ne r) gnd tach12 pw m1 2 vf an gnd gnd gnd gnd fan 4 - 6 and 10 - 12 header s max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 15 figure 5d. max31790 ev kit schematic (sheet 4 of 4) mcl r 1 p 3,hb 2 com_l ed,boot 3 p1 4 p2 5 rcv 6 p6 , cs 7 gnd 8 osc1 9 osc2 10 p4 11 uoe 12 ps _var 13 vusb 14 d- ,vm 15 d+,vp 16 enum 17 p 9,sdo 18 gnd 19 vdd 20 p 11,sdi ,sda 21 p 10,sck ,scl 22 vmo 23 vp o 24 usb_det 25 p5 26 p7 ,1w_dq 27 p8 ,1w_ pu 28 u5i pi cfor ds3900 vbus 1 d- 2 d+ 3 i .d. 4 gnd 5 j1i usb_5p in out 1 gnd 2 fl ag 3 on 4 in 5 max4787exk +tct- nd u1i max4787 shdn 1 gnd 2 in 3 out 4 bp 5 u2i max8868euk 33- t d1i le d r1i 330 r2i 24.9 r3i 24.9 r7i 330 r8i 330 r9i 2.2k c5 i 4.7uf c13i 0.1uf c12i 1.0uf c2i 4.7uf c1i 0.1uf c3i 1.0uf c14i 220nf c4i 0.01uf gnd gnd d- d+ vbus gnd 5v gnd 3.3v rcv 1 vp o 2 mode 3 vmo 4 oe 5 susp 6 vp i 7 vmi 8 enum 9 vc c 10 gnd 11 d- 12 d+ 13 vtrm 14 vl 15 usb_de t 16 rc v v p o mo d e vm o o e s u s p v p i vm i e nu m v c c gn d d - d + v t r m v l u s b _d e t u3i max3344e vcca 1 a0 2 a1 3 a2 4 a3 5 a4 6 a5 7 a6 8 a7 9 gnd 10 oe 11 b7 12 b6 13 b5 14 b4 15 b3 16 b2 17 b1 18 b0 19 vccb 20 v cc a a 0 a 1 a 2 a 3 a 4 a 5 a 6 a 7 gn d o e b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0 v cc b u4i f xma108 rcv 3v3 vp o 3v 3 vmo 3v3 oe 3v 3 vp i 3v3 vmi 3v3 usb_det 3v 3 d+ d- enum 3v3 gnd 3.3v 5v c10i 1.0uf c9i 1.0uf c11i 0.1uf gnd 3.3v vtrm 3.3v vc c c6i 0.1uf c7i 0.1uf gnd enum 3v 3 vmi 3v3 oe 3v 3 vmo 3v 3 vp o 3v 3 rcv 3v 3 usb_det 3v 3 vp i 3v3 usb_det vdu t rcv vdut vp o vdu t vmo vdut oe vdut vp i vdut vmi vdut enum vdut r6i 10k gnd gnd r4i 100k r5i 10k gn d gnd vc c vc c oe vdu t rcv vdut usb_det vdut vp o vdut vmo vdut enum vdu t vp i vdut vmi vdut vc c gnd p7 p6 gnd scl _p ic sda_pi c r10i 4.7k 1 2 j4 i gnd vp p co m cl k 3v3 c8i0 .01uf 3.3v gnd cl k vdut vc c cl k vdut in h 1 gnd 2 out 3 vc c 4 i n h gn d ou t v c c x1i osc_cmos_4pin 1 2 d3i gr een d2i b re d d2i a j3i j2 i 100m a current lim iting switch . 3.3v l inear regulator, 150m a ma x usb transceiv er. conv erts usb signals to logical signals. the high le v el for the logical signals is 3.3v. 48mhz oscillator 8- channel, bi- directional le ve l t ranslator. usb side has a xed 3.3v reference. p ic side reference is the va rying vdut reference. q1i nmos usb-to-i2c master max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 16 figure 6. max31790 ev kit pcb layouttop max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 17 figure 7. max31790 ev kit pcb layoutbottom max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
maxim integrated 18 ordering information # denotes an rohs-compliant device that may include lead(pb), which is exempt under the rohs requirements. part type MAX31790EVKIT# ev kit max31790 evaluation kit evaluates: max31790 www.maximintegrated.com
? 2012 maxim integrated products, inc. 19 revision history revision number revision date description pages changed 0 1/13 initial release maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifcations without notice at any time. max31790 evaluation kit evaluates: max31790 maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com.

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