MAX31850/MAX31851 Evaluation Kit General Description The MAX31850/MAX31851 evaluation kit (EV kit) provides the hardware and software graphical user interface (GUI) necessary to evaluate the MAX31850/MAX31851 cold-junction compensated, 1-Wire® thermocouple-todigital converter. The EV kit comes with a MAX31850KATB+ soldered to the PCB. This is the K-type thermocouple version of the device. Other thermocouple types can be evaluated by procuring the desired thermocouple, thermocouple socket, 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 MAX31850/MAX31851 EV Kit Board 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. 19-6752; Rev 0; 7/13 Evaluates: MAX31850/MAX31851 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 MA31850/MAX31851 EV Kit Files FILE DESCRIPTION MAX31850_51EVKitSetup.EXE Application Program Note: The .EXE is downloaded as a .ZIP file. Ordering Information appears at end of data sheet. MAX31850/MAX31851 Evaluation Kit Evaluates: MAX31850/MAX31851 Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION C1, C5, C203, C214 4 0.01µF ceramic capacitors (0805) TH1 1 K-type thermocouple socket Omega PCC-SMP-K-5-ROHS C2, C3, C6, C7, C215 0 Do not populate, ceramic capacitors (0805) TH2 0 Do not populate, thermocouple socket C4, C8, C212 3 0.1µF ceramic capacitors (0805) TP1 1 White test point C201, C202, C204 TP2, TP3 2 Black test points 3 10µF ceramic capacitors (0805) TP6 1 Red test point C211 1 1.0µF ceramic capacitor (0805) C213 1 0.22µF ceramic capacitor (0805) U1 1 Thermocouple-to-digital converter (10 TDFN-EP*) Maxim MAX31850KATB+ D20, D21 2 Red/green dual LEDs D22 1 Schottky diode U3 0 Do not populate, MAX31850/ MAX31851 J20 1 5-pin female Micro-USB connector U2, U4 2 J21 0 Do not populate, 2-pin header TVS diode arrays (3 SOT) NUP2105LT1G JP1–JP12 12 3-pin (1 x 3) headers, 2.54mm pitch U20 1 Microcontroller (28 SO) Microchip PIC18LF2550-I/SO L1–L4 4 470Ω ferrite beads (0603) BLM18PG471SN1D U21 1 M200 1 30V, 1.2A pMOS (3 SC70) 50mA to 600mA current-limit switch (6 SOT23) Maxim MAX4995AAUT+ R201, R202, R214, R218 4 0Ω ±1% resistors (0805) U22 1 500mA LDO regulator Maxim MAX8902BATA+ R203, R205 1 560Ω ±1% resistors (0805) R204 1 100kΩ ±1% resistor (0805) X1 1 48MHz, 3.3V oscillator (SMD) AVX KC3225A48.0000C30E00 R206 1 45.3kΩ ±1% resistor (0805) — 1 Micro-USB cable R207 1 10kΩ ±1% resistor (0805) — 1 R210, R217 2 4.7kΩ ±1% resistors (0805) K-type thermocouple Omega 5SRTC-GG-K-24-36-ROHS R211, R212 2 330Ω ±1% resistors (0805) — 12 Jumpers/shunts R213 1 2.2kΩ ±1% resistor (0805) — 1 PCB: MAX31850/51 EV Kit *EP = Exposed pad. Component Suppliers SUPPLIER PHONE WEBSITE AVX North America 864-967-2150 www.avx.com Omega Engineering, Inc 888-826-6342 www.omega.com Note: Indicate that you are using the MAX31850/MAX31851 when contacting these component suppliers. www.maximintegrated.com Maxim Integrated │ 2 MAX31850/MAX31851 Evaluation Kit 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 underlined 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 – 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. JP3–JP6 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 together. 4) Prior to starting the GUI, connect the EV kit hardware to a PC using the supplied Micro-USB cable, or equivalent. 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. www.maximintegrated.com Evaluates: MAX31850/MAX31851 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 complete, 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 MAX31850/MAX31851 Evaluation Kit Evaluates: MAX31850/MAX31851 Figure 1. MAX31850/MAX31851 EV Kit GUI (Read Data Tab) 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. Table 1. Sensitivity of Thermocouples TYPE SENSITIVITY (μV/ºC) K* 41.276 J 57.953 N 36.256 R 10.506 S 9.587 T 52.18 E 76.373 *Default setting. www.maximintegrated.com Maxim Integrated │ 4 MAX31850/MAX31851 Evaluation Kit 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 Evaluates: MAX31850/MAX31851 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) www.maximintegrated.com Maxim Integrated │ 5 MAX31850/MAX31851 Evaluation Kit 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 Evaluates: MAX31850/MAX31851 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 temperature 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 scratchpad and displays the 9 bytes in the Scratchpad table. The Read Power Supply (B4h) button reads the powersupply mode and displays the byte in the Power Supply Mode edit field. Figure 3. MAX31850/MAX31851 EV Kit GUI (1-Wire Commands Tab) www.maximintegrated.com Maxim Integrated │ 6 MAX31850/MAX31851 Evaluation Kit Evaluates: MAX31850/MAX31851 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 hardware is USB powered, meaning that no power supplies are needed. Thermocouple Channels The EV kit hardware features two thermocouple channels. The top channel comes preconfigured with a MAX31850KATB+, K-type thermocouple, and thermocouple 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, corresponding 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 numbers of the three items required for the desired thermocouple 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 Configuration To power the device externally with 3.3V, move both jumpers on JP1 and JP2 to the 3.3V position on the right. For parasite power, move JP1 and JP2 to the GND and DQ position on the left. See Table 3 for the jumper descriptions. Table 2. Items for Other Thermocouple Types TYPE PART THERMOCOUPLE* SOCKET* K MAX31850KATB+ 5SRTC-GG-K-24-36 PCC-SMP-K-5 J MAX31850JATB+ 5SRTC-GG-J-24-36 PCC-SMP-J-5 N MAX31850NATB+ NMQIN-010E-6 (unverified) 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 MAX31851SATB+ — — R MAX31851RATB+ — — *Thermocouple and socket part numbers are Omega part numbers. Contact Omega for RoHS part numbers. www.maximintegrated.com Maxim Integrated │ 7 MAX31850/MAX31851 Evaluation Kit Evaluates: MAX31850/MAX31851 Table 3. Description of Jumpers (JP1–JP6) JUMPER JUMPER POSITION JP1 JP2 JP3 JP4 JP5 JP6 DESCRIPTION 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 3.3V Connects the AD pin’s high reference to 3.3V for external power mode DQ Connects the AD pin’s high reference to DQ for parasite power mode High Connects AD3 to a high reference Low Connects AD3 to GND High Connects AD2 to a high reference Low Connects AD2 to GND High Connects AD1 to a high reference Low Connects AD1 to GND High Connects AD0 to a high reference Low Connects AD0 to GND 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 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 different 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. GUI says hardware not found www.maximintegrated.com Maxim Integrated │ 8 www.maximintegrated.com D C B A 1 2 1 DNP TH2 1 2 Channel 2 PCC-SMP-K-100 TH1 Channel 1 1 1 1 1 1 BLM18PG471 L4 GND BLM18PG471 L3 BLM18PG471 L2 GND BLM18PG471 L1 U2 1 2 U4 1 2 GND NUP2105LT1G 2 3 2 GND GND NUP2105LT1G 2 3 2 GND C7 DNP C3 DNP 2 2 C8 0.1uF C5 0.01uF C6 DNP GND C4 0.1uF C1 0.01uF C2 DNP GND 3.3V 1 2 3 CON3 CON3 3.3V 1 2 3 JP7 DNP GND TT+ VDD DQ U3 JP8 CON3 CON3 10 9 8 7 6 1 2 3 1 2 3 DNC AD3 AD2 AD1 AD0 3.3V JP2 DQ 10 9 8 7 6 JP1 GND DQ 1 2 3 4 5 3.3V DNC AD3 AD2 AD1 AD0 MAX31850/51 GND TT+ VDD DQ U1 TP1 DQ 1 2 3 4 5 GND 3 GND GND 3 AD0 1 2 3 AD1 JP12 1 2 3 JP11 AD2 1 2 3 JP10 AD3 1 2 3 JP9 AD0 1 2 3 AD1 JP6 1 2 3 JP5 AD2 1 2 3 JP4 AD3 1 2 3 JP3 TP3 TP2 GND GND GND 4 4 D C B A MAX31850/MAX31851 Evaluation Kit Evaluates: MAX31850/MAX31851 Figure 4a. MAX31850/MAX31851 EV Kit Schematic (Sheet 1 of 2) Maxim Integrated │ 9 D C B 2 1 VCC 1 GND 48MHz C215 DNP 3 CLK 3.3V 4 GND GND OUT INH X1 J21 2 1 DNP R210 4.7k COM C214 0.01uF 0 GND R211 330 D21A R214 Red 3.3V Green FLAG OUT IN GND ON SETI U21 2 1 2 3 C213 0.22uF VPP 1 HB 2 COM3 4 5 6 7 8 OSC1 9 10 11 12 13 14 3.3V D22 GND 10uF C202 5V Green 2 DS3900_PIC MCLR P8,1W_PU P3,HB P7,1W_DQ COM_LED,BOOT P5 P1 USB_DET P2 VPO RCV VMO P6,CS P10,SCK,SCL GND P11,SDI,SDA OSC1 VDD OSC2 GND P4 P9,SDO UOE ENUM PS,VAR D+,VP VUSB D-,VM U20 MAX4995AAUT+ R204 C201 100k 10uF 6 5 4 R212 R213 330 2.2k D21B 560 Red J20 D20A 1 VBUS Vbus R201 D2 0 DR202 D+ 3 0 D+ 4 I.D. 5 GND USB_MICRO-B R203 1 www.maximintegrated.com 2 A 1 28 27 26 25 24 23 22 21 20 19 18 17 16 D+ 15 D- R205 560 D20B 3 0 R218 8 7 6 5 DQ C211 1.0uF MAX8902BATA+ IN OUT GND BYP EN FB GS POK U22 M200 R217 PMOS 4.7k 3.3V 1 2 3 4 3 GND 3.3V R207 10k R206 45.3k C212 0.1uF MAXIM_Logo MAXIM Logo 0.01uF C203 3.3V C204 10uF 3.3V TP6 4 4 D C B A MAX31850/MAX31851 Evaluation Kit Evaluates: MAX31850/MAX31851 Figure 4b. MAX31850/MAX31851 EV Kit Schematic (Sheet 2 of 2) Maxim Integrated │ 10 MAX31850/MAX31851 Evaluation Kit Evaluates: MAX31850/MAX31851 Figure 5. MAX31850/MAX31851 EV Kit PCB Layout—Top Layer Figure 6. MAX31850/MAX31851 EV Kit PCB Layout—Bottom Layer www.maximintegrated.com Maxim Integrated │ 11 MAX31850/MAX31851 Evaluation Kit Evaluates: MAX31850/MAX31851 Ordering Information PART MAX31850EVKIT# TYPE EV Kit #Denotes an RoHS-compliant device that may include lead(Pb), which is exempt under the RoHS requirements. www.maximintegrated.com Maxim Integrated │ 12 MAX31850/MAX31851 Evaluation Kit Evaluates: MAX31850/MAX31851 Revision History REVISION NUMBER REVISION DATE 0 7/13 DESCRIPTION Initial release PAGES CHANGED — 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 specifications 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. © 2013 Maxim Integrated Products, Inc. │ 13