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general description the max31850/max31851 evaluation kit (ev kit) pro - vides the hardware and software graphical user interface (gui) necessary to evaluate the max31850/max31851 cold-junction compensated, 1-wire ? thermocouple-to- digital converter. the ev kit comes with a max31850katb+ soldered to the pcb. this is the k-type thermocouple ver sion of the device. other thermocouple types can be evaluated by procuring the desired thermocouple, ther mocouple sock - et, and corresponding max31850 or max31851. contact the factory for free samples of the devices to match your desired thermocouple type. see the evaluating other thermocouple types section for part numbers and addi - tional information regarding other thermocouple types. ev kit contents assembled circuit board including max31850k micro-usb cable k-type thermocouple features includes everything needed to evaluate a max31850k with a k-type thermocouple ev kit hardware is usb powered (usb cable included) windows xp ? - and windows ? 7-compatible operating system software usb hid interface second channel allows easy evaluation of other thermocouple types fully assembled and tested on proven pcb layout rohs compliant 19-6752; rev 0; 7/13 ordering information appears at end of data sheet. 1-wire is a registered trademark of maxim integrated products, inc. windows and windows xp are registered trademarks and registered service marks of microsoft corporation. max31850/max31851 ev kit board note: the .exe is downloaded as a .zip file. ma31850/max31851 ev kit files file description max31850_51evkitsetup.exe application program evaluates: max31850/max31851 max31850/max31851 evaluation kit
* ep = exposed pad. note: indicate that you are using the max31850/max31851 when contacting these component suppliers. designation qty description c1, c5, c203, c214 4 0.01f ceramic capacitors (0805) c2, c3, c6, c7, c215 0 do not populate, ceramic capacitors (0805) c4, c8, c212 3 0.1f ceramic capacitors (0805) c201, c202, c204 3 10f ceramic capacitors (0805) c211 1 1.0f ceramic capacitor (0805) c213 1 0.22f ceramic capacitor (0805) d20, d21 2 red/green dual leds d22 1 schottky diode j20 1 5-pin female micro-usb connector j21 0 do not populate, 2-pin header jp1Cjp12 12 3-pin (1 x 3) headers, 2.54mm pitch l1Cl4 4 470 ferrite beads (0603) blm18pg471sn1d m200 1 30v, 1.2a pmos (3 sc70) r201, r202, r214, r218 4 0 1% resistors (0805) r203, r205 1 560 1% resistors (0805) r204 1 100k 1% resistor (0805) r206 1 45.3k 1% resistor (0805) r207 1 10k 1% resistor (0805) r210, r217 2 4.7k 1% resistors (0805) r211, r212 2 330 1% resistors (0805) r213 1 2.2k 1% resistor (0805) designation qty description th1 1 k-type thermocouple socket omega pcc-smp-k-5-rohs th2 0 do not populate, thermocouple socket tp1 1 white test point tp2, tp3 2 black test points tp6 1 red test point u1 1 thermocouple-to-digital converter (10 tdfn-ep*) maxim max31850katb+ u3 0 do not populate, max31850/ max31851 u2, u4 2 tvs diode arrays (3 sot) nup2105lt1g u20 1 microcontroller (28 so) microchip pic18lf2550-i/so u21 1 50ma to 600ma current-limit switch (6 sot23) maxim max4995aaut+ u22 1 500ma ldo regulator maxim max8902bata+ x1 1 48mhz, 3.3v oscillator (smd) avx kc3225a48.0000c30e00 1 micro-usb cable 1 k-type thermocouple omega 5srtc-gg-k-24-36-rohs 12 jumpers/shunts 1 pcb: max31850/51 ev kit supplier phone website avx north america 864-967-2150 www.avx.com omega engineering, inc 888-826-6342 www.omega.com component list component suppliers maxim integrated 2 evaluates: max31850/max31851 max31850/max31851 evaluation kit www.maximintegrated.com
quick start required equipment max31850/max31851 ev kit hardware windows xp or windows 7 pc with a spare usb port usb port micro-usb cable (included) k-type thermocouple (included) 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 follow the steps below to get started measuring tem perature using the device interfaced to a k-type thermocouple. 1) connect the included k-type thermocouple to th1 (thermocouple socket) of the ev kit hardware. one terminal of the thermocouple is wider than the other, ensuring proper polarity. 2) ensure that jumpers/shunts are installed on jp1 C jp6. jp1 and jp2 should both be either positioned on the left for parasitic power mode or positioned on the right to be externally powered. jp3Cjp6 jumpers can be in either position depending on the desired location address. 3) set the ev kit hardware on a nonconductive surface to ensure that nothing on the pcb gets shorted togeth er. 4) prior to starting the gui, connect the ev kit hard - ware to a pc using the supplied micro-usb cable, or equiva lent. the power led (d20) should be green and the com led (d21) should be red and slowly flash orange. 5) 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, 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. 6) once the device driver installation is complete, visit www.maximintegrated.com/evkitsoftware to download the latest version of the ev kit software, titled max31850_51evkitsetup.zip. save the ev kit software to a temporary folder. 7) unzip the .zip file and double click the .exe file to run the installer. a message box stating the publisher could not be verified. are you sure you want to run this software? may appear. if so, click yes . 8) follow the instructions on the installer and once com - plete, click finish . the default location of the gui is in the program files directory. 9) when the gui appears, the status bar should display ev kit hardware connected in the bottom right hand corner. the com led (d21) on the ev kit board should turn green. detailed description of software software startup if the max31850/max31851 ev kit is connected when the software is opened, the software first initializes the hardware to communicate. then the software searches for all rom codes on the bus and lists them in the rom code drop-down lists. if a rom code is found with the correct family code (3bh), the software reads all data from the device. if the software is started without the hardware connected, the initialization sequence above is executed once the ev kit is connected. read data tab when the read data tab sheet ( figure 1 ) is selected, a temperature conversion is performed and the scratchpad and power-supply mode are read from the device. the read power mode button executes the match rom (55h) and read power supply (b4h) command and displays the data in the power supply mode edit field. the read temperature button executes the match rom (55h), convert t (44h), and read scratchpad (beh) commands. this reads the thermocouple temp , cold junction temp , fault status , and location address , and then the linearized temp is calculated. if the power supply mode is parasite, then a strong pullup is enabled while the device converts temperature. if a fault is detected, then the color indicator turns red and the status bar displays fault! . both buttons match the rom code selected in the rom code drop-down list. the thermocouple type drop-down list is used to calculate the linearized temperature and should be changed to match the hardware thermocouple type. table 1 lists all maxim integrated 3 evaluates: max31850/max31851 max31850/max31851 evaluation kit www.maximintegrated.com
possible settings. the temperature can also be polled by pressing the start polling button in the upper right-hand corner. this executes the same commands as the read temperature button. the polling rate can be selected using the polling menu bar option. to stop polling, press the stop polling button. *default setting. figure 1. max31850/max31851 ev kit gui (read data tab) table 1. sensitivity of thermocouples type sensitivity ( v/oc) k* 41.276 j 57.953 n 36.256 r 10.506 s 9.587 t 52.18 e 76.373 maxim integrated 4 evaluates: max31850/max31851 max31850/max31851 evaluation kit www.maximintegrated.com
temperature graph tab the temperature graph tab sheet ( figure 2 ) displays a line graph of the polled temperatures. data points are plotted when the start polling button is pressed. to show/ hide a series in the graph, check/uncheck the checkboxes on the bottom. the graph can save up to 500,000 data points per series. to save the data to a csv file, press the save data button. the graph can be cleared by pressing the clear graph button. figure 2. max31850/max31851 ev kit gui (temperature graph tab) maxim integrated 5 evaluates: max31850/max31851 max31850/max31851 evaluation kit www.maximintegrated.com
1-wire commands tab the 1-wire commands tab sheet ( figure 3 ) contains buttons for all the 1-wire commands and displays the data in hex format. all the rom command buttons first issue a reset and detect a presence before sending their command. the device can also be reset using the reset device option in the device menu. the search rom (f0h) button searches for all the rom codes on the bus and places them in the rom codes found drop-down list. this same search can be performed using the search for roms option in the device menu. when a rom code is selected from the drop-down list, the rom code table is automatically populated with this selection. the match rom (55h) button matches the rom selected in the drop-down list. the read rom (33h) button reads the rom on the 1-wire bus and displays it in the rom code table. the skip rom (cch) sends the skip rom command. the read rom (33h) and skip rom (cch) buttons should be used if only one device is on the bus. the max31850/51 commands should only be pressed after a rom command is complete. to perform a tem - perature conversion, press the convert t (44h) button. if the device is configured in parasite power mode (00h), then the enable strong pull up checkbox should be checked before the convert t (44h) button is pressed. the read scratchpad (beh) button reads the scratch - pad and displays the 9 bytes in the scratchpad table. the read power supply (b4h) button reads the power- supply mode and displays the byte in the power supply mode edit field. figure 3. max31850/max31851 ev kit gui (1-wire commands tab) maxim integrated 6 evaluates: max31850/max31851 max31850/max31851 evaluation kit www.maximintegrated.com
detailed description of hardware the max31850/max31851 ev kit hardware provides everything needed to evaluate a k-type thermocouple. in addition to a thermocouple and max31850, the hardware includes a usb interface that is used to communicate with the pc-based software. an added feature is that the hard ware is usb powered, meaning that no power sup - plies are needed. thermocouple channels the ev kit hardware features two thermocouple channels. the top channel comes preconfigured with a max31850katb+, k-type thermocouple, and ther - mocouple socket. a sec ond channel is provided to make it easy to evaluate other thermocouple types. the bottom channel is almost fully populated, missing only the desired max31850 or max31851 version, correspond ing thermocouple, and thermocouple socket. the following section describes how to modify the hardware in order to evaluate other thermocouple types. evaluating other thermocouple types to use the bottom channel, see table 2 for the part num - bers of the three items required for the desired thermo - couple type. once the three items have been procured, power down the ev kit by disconnecting the micro-usb cable. carefully solder the maxim device to the footprint labeled u3 and the thermocouple socket to the footprint labeled th2. finally, connect the thermocouple to the socket. reconnect the usb cable to the ev kit and then run the software. in the device menu on the gui, select the search for roms option. two devices should be found and shown in the rom codes drop-down list. select the correct thermocouple type in the table and the device is ready to be evaluated. user-supplied 1-wire interface to communicate with the devices with a user-supplied 1-wire interface, first disconnect the usb and remove resistor r218 to disconnect the on-board interface. connect the off-board 1-wire interface to the gnd, dq, and 3.3v test points for the externally powered mode. if parasite-power mode is configured on jp1 and jp2, only the gnd and dq test points need to be connected to the user-supplied interface. power confguration to power the device externally with 3.3v, move both jumpers on jp1 and jp2 to the 3.3v position on the right. for para - site power, move jp1 and jp2 to the gnd and dq position on the left. see table 3 for the jumper descriptions. *thermocouple and socket part numbers are omega part numbers. contact omega for rohs part numbers. table 2. items for other thermocouple types type part thermocouple* socket* k max31850 katb+ 5srtc-gg-k-24-36 pcc-smp-k-5 j max31850jatb+ 5srtc-gg-j-24-36 pcc-smp-j-5 n max31850natb+ 104,1(xqhulhg pcc-smp-n-5 t max31850tatb+ 5srtc-gg-t-24-36 pcc-smp-t-5 e max31850eatb+ 5srtc-gg-e-24-36 pcc-smp-e-5 s max31851 satb+ r max31851ratb+ maxim integrated g 7 evaluates: max31850/max31851 max31850/max31851 evaluation kit www.maximintegrated.com
troubleshooting the ev kit should work on the first try directly out of the box. in the rare occasion that a problem is suspected, see table 4 to help troubleshoot the issue. table 4. troubleshooting symptom check solution gui says hardware not found is the power led (d20) 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 com led (d21) turn green when the gui is running? if not, then exit the gui and try running it again. if the com led still does not turn green, then exit the gui and try connecting the usb cable to a different usb port on the pc. wait for a windows message that states the hardware is ready to use. run the gui again. are any of the leds illuminated? if not, then the pcb may not be getting power from the usb. try a dif - ferent usb cable or a different usb port. the data temperature and power-supply data is incorrect jp1 (vdd pin) the vdd pin cannot be left unconnected. populate a jumper to the right (3.3v) position for external power or to the left (gnd) position for parasite power. gui says no rom codes found r218 make sure r218 is populated. this connects the dq pin to the usb to 1-wire interface. table 3. description of jumpers (jp1 C jp6) jumper jumper position description jp1 3.3v connects the vdd pin of the device to 3.3v for external power mode gnd connects the vdd pin of the device to gnd for parasite power mode jp2 3.3v connects the ad pins high reference to 3.3v for external power mode dq connects the ad pins high reference to dq for parasite power mode jp3 high connects ad3 to a high reference low connects ad3 to gnd jp4 high connects ad2 to a high reference low connects ad2 to gnd jp5 high connects ad1 to a high reference low connects ad1 to gnd jp6 high connects ad0 to a high reference low connects ad0 to gnd maxim integrated 8 evaluates: max31850/max31851 max31850/max31851 evaluation kit www.maximintegrated.com
figure 4a. max31850/max31851 ev kit schematic (sheet 1 of 2) 1 1 2 2 3 3 4 4 d d c c b b a a c1 0.01uf c2 dnp c3 dnp 1 2 3 jp3 ad3 1 2 3 jp4 ad2 1 2 3 jp5 ad1 1 2 3 jp6 ad0 gnd 1 t- 2 t+ 3 vdd 4 dq 5 ad0 6 ad1 7 ad2 8 ad3 9 dnc 10 u1 max31850/51 1 2 3 u2 nup 2105lt1g 1 2 th1 p cc-smp- k - 100 1 2 l 1 blm18pg471 1 2 l 2 blm18pg471 gnd gnd gnd gnd gnd gnd channel 1 channel 2 c5 0.01uf c6 dnp c7 dnp 1 2 3 jp9 ad3 1 2 3 jp10 ad2 1 2 3 jp11 ad1 1 2 3 jp12 ad0 gnd 1 t- 2 t+ 3 vdd 4 dq 5 ad0 6 ad1 7 ad2 8 ad3 9 dnc 10 u3 dnp 1 2 3 u4 nup 2105lt1g 1 2 th2 dnp 1 2 l 3 blm18pg471 1 2 l 4 blm18pg471 gnd gnd gnd gnd gnd gnd dq tp 2 gnd tp 3 gnd gnd tp 1 dq 1 2 3 jp2 con3 1 2 3 jp1 con3 1 2 3 jp7 con3 1 2 3 jp8 con3 3.3v 3.3v 3.3v 3.3v dq c4 0.1uf c8 0.1uf maxim integrated 9 evaluates: max31850/max31851 max31850/max31851 evaluation kit www.maximintegrated.com
figure 4b. max31850/max31851 ev kit schematic (sheet 2 of 2) 1 1 2 2 3 3 4 4 d d c c b b a a r203 560 r201 0 r202 0 r211 330 r212 330 r213 2.2k r214 0 c204 10uf c212 0.1uf c211 1.0uf c202 10uf c201 10uf c213 0.22uf c214 0.01uf d- d+ vbus 5v 3.3v 1 2 d22 3.3v 3.3v d+ d- tp 6 3.3v r210 4.7k c215 dnp 1 2 j21 dnp vpp osc1 hb com g r e e n d21b r e d d21a com i nh 1 gnd 2 out 3 vcc 4 x1 48mhz 3.3v clk 3.3v r204 100k r ed d20a g r e e n d20b r205 560 c203 0.01uf r207 10k r206 45.3k out 1 gnd 2 seti 3 on 4 i n 5 f l ag 6 u21 max4995aaut+ i n 1 gnd 2 en 3 gs 4 p ok 5 f b 6 byp 7 out 8 u22 max8902bata+ gnd gnd gnd gnd gnd m200 p mos r217 4.7k 3.3v mcl r 1 p 3,hb 2 com_led,boot 3 p 1 4 p 2 5 rcv 6 p 6,cs 7 gnd 8 osc1 9 osc2 10 p 4 11 uoe 12 p s,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 vpo 24 usb_det 25 p 5 26 p 7,1w_dq 27 p 8,1w_pu 28 u20 ds3900_pi c maxim l ogo maxim_logo dq vbus 1 d- 2 d+ 3 i .d. 4 gnd 5 j20 usb_mi cro-b r218 0 maxim integrated 10 evaluates: max31850/max31851 max31850/max31851 evaluation kit www.maximintegrated.com
figure 5. max31850/max31851 ev kit pcb layout top layer figure 6. max31850/max31851 ev kit pcb layout bottom layer maxim integrated 11 evaluates: max31850/max31851 max31850/max31851 evaluation kit www.maximintegrated.com
# denotes an rohs-compliant device that may include lead(pb), which is exempt under the rohs requirements. ordering information part type MAX31850EVKIT# ev kit maxim integrated 12 evaluates: max31850/max31851 max31850/max31851 evaluation kit www.maximintegrated.com
revision history revision number revision date description pages changed 0 7/13 initial release ? 2013 maxim integrated products, inc. 13 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. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. evaluates: max31850/max31851 max31850/max31851 evaluation kit

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