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XTR108EVM-USB Evaluation Board and Software Tutorial
This user's guide describes the characteristics, operation and use of the XTR108EVM-USB evaluation
module (EVM). This EVM is designed to evaluate the performance of the XTR108, an SPI™-
programmable, current- or voltage-output, two-wire transmitter designed for temperature and bridge
sensors. Throughout this document, the terms evaluation board, evaluation module, and EVM are
synonymous with the XTR108EVM-USB. This user's guide also includes information regarding operating
procedures and input/output connections, an electrical schematic, printed circuit board (PCB) layout
drawings, and a parts list for the EVM.
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Windows is a trademark of Microsoft Corporation.
SPI is a trademark of Motorola, Inc.
All other trademarks are the property of their respective owners.
SBOU123A - March 2012 - Revised September 2016
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Copyright © 2012-2016, Texas Instruments Incorporated
SBOU123A - March 2012 - Revised September 2016
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XTR108EVM-USB Evaluation Board and Software Tutorial
User's Guide
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Related Manuals for Texas Instruments XTR108EVM-USB
Summary of Contents for Texas Instruments XTR108EVM-USB
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Page 1: Table Of Contents
SBOU123A – March 2012 – Revised September 2016 XTR108EVM-USB Evaluation Board and Software Tutorial This user's guide describes the characteristics, operation and use of the XTR108EVM-USB evaluation module (EVM). This EVM is designed to evaluate the performance of the XTR108, an SPI™- programmable, current- or voltage-output, two-wire transmitter designed for temperature and bridge sensors. - Page 2 J4 Pinout (Vo_XTR108) ..................... J5 Pinout (RTD_CON) ..................Sensor Board Jumper Functions ............XTR108EVM-USB Interface Board Default Jumper Settings ............XTR108EVM-USB Sensor Board Default Jumper Settings ........PGA Gain, Loop Transconductance, and Input Full-Scale Differential Voltage .................. Equations for Calculating Zero Output ...................
- Page 3 ..............XTR108EVM-USB Interface Board Bill of Materials ..............XTR108EVM-USB Sensor Board Bill of Materials ....................Standard RTD Equations ..................... Mnemonic Commands ....................SPI Modes of Operation ..................General USB-DAQ Commands SBOU123A – March 2012 – Revised September 2016 XTR108EVM-USB Evaluation Board and Software Tutorial Submit Documentation Feedback Copyright ©...
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Page 4: Overview
Texas Instruments web site at www.ti.com. The XTR108EVM-USB is an evaluation module that is used to fully evaluate the XTR108. The XTR108 is an integrated circuit that provides correction of zero, span, and linearization errors for RTDs (resistive thermal devices) and bridge sensors. -
Page 5: Hardware Included With The Xtr108Evm-Usb
Overview www.ti.com XTR108EVM-USB Kit Contents Figure 1 shows the hardware included with the XTR108EVM-USB kit. Table 1 describes each item included in the kit. Contact the Texas Instruments Product Information Center nearest you if any component is missing. It is highly recommended that you also check the... -
Page 6: Hardware Overview
Table 2 provide information regarding Texas Instruments' hardware used in assembly of the XTR108EVM-USB. This user's guide is available from the TI web site under literature number SBOU123. Any letter appended to the literature number corresponds to the document revision that is current at the time of the writing of this document. -
Page 7: Xtr108Evm-Usb Block Diagram
Connection Figure 3. XTR108EVM-USB Block Diagram The XTR108EVM-USB Interface Board provides connections to the SPI interface and 5.0-V power supply on the USB DAQ Platform and also provides a convenient interface to an external digital multimeter (DMM). The Interface Board also contains a network of signal-controlled relays from the USB DAQ that handles the routing of all EVM input and output signals. -
Page 8: Xtr108Evm-Usb Interface Board Connectors And Jumpers
Hardware Overview www.ti.com Interface Board Overview Figure 4 shows the location of all XTR108EVM-USB Interface Board connectors and jumpers. Figure 4. XTR108EVM-USB Interface Board Connectors and Jumpers XTR108EVM-USB Evaluation Board and Software Tutorial SBOU123A – March 2012 – Revised September 2016 Submit Documentation Feedback Copyright ©... -
Page 9: Multimeter Connect Pinout
Hardware Overview www.ti.com 2.2.1 Interface Board: Signal Definitions and Pinouts This section provides the signal definitions for all XTR108EVM-USB Interface Board connectors. 2.2.1.1 Multimeter Connect Table 3 shows the signals connected to the Multimeter Connect interface on the Interface Board. -
Page 10: J3 Pinout (Io_Xtr108)
SPI_DIN2 SPI data input, channel 2 VDUT Switched power supply USB DAQ power supply 24, 25 Ground XTR108EVM-USB Evaluation Board and Software Tutorial SBOU123A – March 2012 – Revised September 2016 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated... -
Page 11: J6 Pinout (25-Pin Male Dsub)
XTR108 system. Table 10. J7 Pinout (SPI) Name Description SPI data input/output SPI clock SPI chip select SBOU123A – March 2012 – Revised September 2016 XTR108EVM-USB Evaluation Board and Software Tutorial Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated... -
Page 12: J8 Pinout (Rtd_Con)
(zero-scale resistor) RTD resistance 2.2.2 Interface Board Jumper Settings Table 12 explains the function of the XTR108EVM-USB Interface Board jumpers. Table 12. Interface Board Jumper Functions Jumper Default Description This jumper selects which resistor string is used for the RTD emulator minimum-scale output. -
Page 13: Xtr108Evm-Usb Sensor Board Connectors And Jumpers
Hardware Overview www.ti.com Sensor Board Overview Figure 5 shows the location of all XTR108EVM-USB Sensor Board connectors and jumpers. Figure 5. XTR108EVM-USB Sensor Board Connectors and Jumpers SBOU123A – March 2012 – Revised September 2016 XTR108EVM-USB Evaluation Board and Software Tutorial Submit Documentation Feedback Copyright ©... -
Page 14: J1 Pinout (Spi)
Hardware Overview www.ti.com 2.3.1 Sensor Board Connections This section provides signal definitions for all XTR108EVM-USB Interface Board connectors. 2.3.1.1 J1 (SPI) Table 13 shows the signals connected to J1 on the Sensor Board. J1 is used to connect an external SPI interface to the Sensor Board. -
Page 15: Sensor Board Jumper Functions
Hardware Overview www.ti.com 2.3.2 Sensor Board Jumper Settings Table 17 explains the function of the XTR108EVM-USB Interface Board jumpers. Table 17. Sensor Board Jumper Functions Jumper Default Description This jumper selects whether to enable or bypass the depletion-mode transistor Q1. -
Page 16: Hardware Setup
Figure 6. Pin Socket Mechanical Description Hardware Setup The XTR108EVM-USB hardware setup involves connecting the three EVM boards together, applying power to the USB DAQ platform, connecting the USB cable, applying power to the Interface Board, and setting the jumpers. This section covers the details of this procedure. -
Page 17: Connecting The Usb Daq Platform To The Xtr108Evm-Usb Interface Board
When first setting up the EVM hardware, It is recommended to first connect the USB DAQ Platform to the XTR108EVM-USB Interface Board. To connect the two PCBs together, gently push on both sides of the 25-pin D-SUB connectors as shown in Figure 7. -
Page 18: Connecting Power To The Usb Daq Platform
Connecting Power and USB to the USB DAQ Platform After the three XTR108EVM-USB boards are connected, connect a 6Vdc to 9Vdc power supply to J5 or T3 of the USB DAQ platform. A power cable is included that fits J5. -
Page 19: Connecting The Usb Cable To The Usb Daq Platform
Figure 10. Connecting the USB Cable to the USB DAQ Platform Figure 11. Found New Hardware Pop-up Message SBOU123A – March 2012 – Revised September 2016 XTR108EVM-USB Evaluation Board and Software Tutorial Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated... -
Page 20: Connecting A Loop Power Supply To The Xtr108Evm-Usb Interface Board
Mode: 12V to 24V Power Supply to J4 Mode: 3V to 5.5V Figure 12. Connecting a Loop Power Supply to the XTR108EVM-USB Interface Board XTR108EVM-USB Evaluation Board and Software Tutorial SBOU123A – March 2012 – Revised September 2016 Submit Documentation Feedback... -
Page 21: 34401A Multimeter Connections
Connecting Outputs to a Digital Multimeter (DMM) The XTR108EVM-USB contains circuitry that routes the current output, voltage output, and RTD emulator signals to the multimeter connect terminals on the XTR108EVM-USB Interface Board. Any standard lab multimeter that supports dc voltage, dc current, and four-wire resistance measurements is compatible with the XTR108EVM-USB. -
Page 22: Usb Daq Platform Default Jumper Settings
For more information about the function of these jumpers, refer to the USB DAQ Platform User's Guide. Figure 14. USB DAQ Platform Default Jumper Settings XTR108EVM-USB Evaluation Board and Software Tutorial SBOU123A – March 2012 – Revised September 2016 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated... -
Page 23: Xtr108Evm-Usb Interface Board Default Jumper Settings
Hardware Setup www.ti.com XTR108EVM-USB Interface Board Default Jumper Settings Figure 15 shows the default XTR108EVM-USB Interface Board jumper configuration. Table 18 summarizes the default jumper configuration. For more information about the jumpers on the Interface Board, see Table Figure 15. XTR108EVM-USB Interface Board Default Jumper Settings Table 18. -
Page 24: Xtr108Evm-Usb Sensor Board Default Jumper Settings
Hardware Setup www.ti.com XTR108EVM-USB Sensor Board Default Jumper Settings Figure 16 shows the default XTR108EVM-USB Sensor Board jumper configuration. Table 19 summarizes the default jumper configuration. For more information about the jumpers on the Sensor Board, see Table Figure 16. XTR108EVM-USB Sensor Board Default Jumper Settings XTR108EVM-USB Evaluation Board and Software Tutorial SBOU123A –... -
Page 25: Software Setup
4. To remove the application, use the Windows Add/Remove Software control panel utility. Starting the XTR108EVM-USB Software The XTR108EVM-USB software can be started through the Windows Start menu. Click Start → All Programs → XTR108EVM-USB → XTR108EVM-USB to start the program, as shown in Figure Figure 17. -
Page 26: Software Overview
Software Overview www.ti.com Software Overview Once the XTR108EVM-USB starts up, several SPI communications take place to initialize the Interface Board and read the XTR108 register values. Refer to Figure 18 for a screen shot of how the software should appear if the EVM is functioning properly. The actual values of the fields inside the XTR108 block diagram (such as PGA gain or I DAC Linearization) may vary. -
Page 27: Usb Communication Error
19. In this case, it is recommended to close the EVM software, disconnect the power and USB cables from the USB-DAQ, and wait a few moments. Next reconnect the power cable, then reconnect the USB cable. After a few moments, start the XTR108EVM-USB software again. Figure 19. USB Communication Error... -
Page 28: Pga Gain, Loop Transconductance, And Input Full-Scale Differential Voltage
Z_COARSE Fine DAC Z_FINE Z_FINE and N are the decimal values of registers 13 and 12, respectively. XTR108EVM-USB Evaluation Board and Software Tutorial SBOU123A – March 2012 – Revised September 2016 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated... - Page 29 XTR108 registers and EEPROM, not by the values selected in the Find Resistors tab in the EVM software. SBOU123A – March 2012 – Revised September 2016 XTR108EVM-USB Evaluation Board and Software Tutorial Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated...
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Page 30: Overscale Threshold
2.96 mA 350 mV 2.76 mA 325 mV 2.56 mA 300 mV 2.37 mA 275 mV 2.17 mA XTR108EVM-USB Evaluation Board and Software Tutorial SBOU123A – March 2012 – Revised September 2016 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated... -
Page 31: Alarm Configuration Register
(RBD) in Control Register 2 (register 4) is provided to allow the XTR108 to read the EEPROM once and then stop. When calibrating the XTR108EVM-USB, it is required that the automatic EEPROM read-back be disabled, so that new values written to the XTR108 registers during the calibration procedure are not immediately overwritten. -
Page 32: Xtr108Evm-Usb Software, Find Resistors Tab
Find Resistors Tab The Find Resistors tab in the XTR108EVM-USB software allows the user to enter the desired XTR108 operating conditions. Based on the user input, the software calculates the appropriate values for the supporting circuitry and performs error-checking to determine if the desired conditions exceed system capabilities. -
Page 33: Standard Rtd Equations
26. A, B, and C are known as Callendar-van Dusen (CVD) coefficients. The industry- standard values for A, B, and C are loaded into the XTR108EVM-USB software by default, but custom values for each channel can be entered in the CVD Coefficients control. The Reset CVD Coefficients button restores the default values when clicked. -
Page 34: Error
Figure 21. R Error The XTR108EVM-USB software also performs a linearity check as part of the Calculate Resistors functionality. If the software predicts that a post-calibrated error less than 0.1% of full-scale is not possible, a warning message is displayed as shown in Figure 22. -
Page 35: Save Model File
4-20mA, CH1 0-300C in the image below. This naming allows for easy differentiation between model files when loading a file for calibration. The default save location for model files is in the Model_files folder within the XTR108EVM-USB install directory (typically at C:\Program Files\XTR108EVM-USB\). -
Page 36: Xtr108Evm-Usb Software, Manual Calibration Tab
Manual Calibration Tab The Manual Calibration tab in the XTR108EVM-USB software allows the user to program the XTR108 using a model file, perform a two-point calibration, calculate the post-calibrated error of the system, and calibrate the overscale and underscale output values. -
Page 37: Adjust Rtd Emulator
5.3.1 Step 1: Initialize Before calibration can take place, a model file must be loaded into the software. The XTR108EVM-USB software automatically loads the most recent model file into memory at startup, but a different model file can be selected by clicking the Load Model File button. The path of the loaded model file is shown in the Model File indicator. - Page 38 NOTE: If the 34401A multimeter is connected to the PC by the NI GPIB-USB-HS controller, the XTR108EVM-USB software automatically configures the 34401A for dc voltage or dc current measurement, measures 10 samples of the output over a 5-second interval, and enters the average output value into the Enter Minimum Output and Enter Maximum Output controls.
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Page 39: Manual Calibration Tab, Post-Calibration
Manual Calibration tab to the initial state. At this point, a new calibration can be performed with either the current model file or a newly loaded model file. SBOU123A – March 2012 – Revised September 2016 XTR108EVM-USB Evaluation Board and Software Tutorial Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated... -
Page 40: Xtr108Evm-Usb Software, Automatic Calibration Tab
Automatic Calibration Tab The Automatic Calibration tab in the XTR108EVM-USB software allows the user to perform a completely automated calibration of the XTR108 using a previously-saved model file. The entire procedure takes less than a minute to complete and only requires the user to click one button. - Page 41 Status indicator displays the message DMM not detected. Auto-Cal unavailable, and the Initiate Auto-Cal button is disabled and grayed out. If the XTR108EVM-USB software does not detect a connected 34401A, close the software, verify the hardware connections, check that the GPIB-to-USB controller is detected by Windows, and then restart the software.
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Page 42: Automatic Calibration Tab, Post-Calibration
If the percentage of error after calibration is greater than 0.1%, the Status indicator displays the message Calibration unsuccessful. Error > 0.1% and the square status LED turns on (red). Figure 28. Automatic Calibration Tab, Post-Calibration XTR108EVM-USB Evaluation Board and Software Tutorial SBOU123A – March 2012 – Revised September 2016 Submit Documentation Feedback... -
Page 43: Xtr108Evm-Usb Software, Registers Tab
Registers Tab The Registers tab in the XTR108EVM-USB software enables the user to view and edit the contents of each register internal to the XTR108. Similar to the Block Diagram tab, it is recommended that only advanced users make bit-level changes using this tab. However, for debugging purposes this capability can be extremely useful. - Page 44 Similarly, the Write EEPROM button writes the current software register values to the EEPROM. If the XTR108EVM-USB software has made changes to the XTR108 register array within the software but has not written those changes to the XTR108 registers, the Pending register changes need to be written LED turns on.
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Page 45: Gpio Control Window
Tools Menu The Tools menu, located in the menu bar in the upper-left corner of the XTR108EVM-USB software, contains additional features useful for debugging or troubleshooting. The following sections explain the use of each option within the Tools menu. -
Page 46: Debug Window
The About window, as shown in Figure 32, lists the version, build date, and author of the currently- installed version of the XTR108EVM-USB software. Figure 32. About Window XTR108EVM-USB Evaluation Board and Software Tutorial SBOU123A – March 2012 – Revised September 2016 Submit Documentation Feedback Copyright ©... -
Page 47: General Operating Tips
XTR108 clock signal. More information regarding this charge pump is located in the XTR108 data sheet and the XTR108 Quick Start System Reference Guide. SBOU123A – March 2012 – Revised September 2016 XTR108EVM-USB Evaluation Board and Software Tutorial Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated... -
Page 48: Hardware Documentation
Hardware Documentation www.ti.com Hardware Documentation This section provides the hardware documentation for the XTR108EVM-USB, including board schematics, layouts, and bill of materials. Schematics Figure 34 shows the XTR108EVM-USB Interface Board schematic. Relay Driver / Control Bits RTD Emulator (Min/Mid/Max) RTD Emulator (Under-scale/Over-scale) -
Page 49: Xtr108Evm-Usb Sensor Board Schematic
Figure 35. XTR108EVM-USB Sensor Board Schematic Layouts Refer to Figure 15 for the XTR108EVM-USB Interface Board component-side layout. Refer to Figure 16 for the XTR108EVM-USB Sensor Board component-side layout. SBOU123A – March 2012 – Revised September 2016 XTR108EVM-USB Evaluation Board and Software Tutorial Submit Documentation Feedback Copyright ©... - Page 50 Hardware Documentation www.ti.com Bill of Materials (BOM) Table 28 gives the XTR108EVM-USB Interface Board bill of materials. Table 29 gives the XTR108EVM-USB Sensor Board bill of materials. Table 28. XTR108EVM-USB Interface Board Bill of Materials Value Ref Des Description Vendor Part Number 10µF...
- Page 51 Hardware Documentation www.ti.com Table 29. XTR108EVM-USB Sensor Board Bill of Materials Value Ref Des Description Vendor Part Number 0.1µF CAP CER .10UF 25V X7R 10% 0603 TDK Corporation C1608X7R1E104K 220pF CAP CER 220PF 50V X7R 10% 0603 TDK Corporation C1608X7R1H221K 2.2µF...
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Page 52: Appendix
0V at T XTR108 CM = 523: 0.52V Figure 36. XTR108 Input MUX Example (T = –200°C, PT100 RTD) XTR108EVM-USB Evaluation Board and Software Tutorial SBOU123A – March 2012 – Revised September 2016 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated... -
Page 53: Xtr108 Input Mux Example
186mV at T XTR108 CM = 5.23k: 0.52V Figure 38. XTR108 Input MUX Example (T = +850°C, PT1000 RTD) SBOU123A – March 2012 – Revised September 2016 XTR108EVM-USB Evaluation Board and Software Tutorial Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated... -
Page 54: Set Circuitry
= 12.1 kΩ, the range of I is 480 µA to 510 µA. If R = 121 kΩ, the range of I becomes 48 µA to 51 µA. The Find Resistors tab within the XTR108EVM-USB software helps to determine the appropriate R value. Zero... -
Page 55: Linearity Correction Method
Uncorrected Corrected −1 −200 Temperature (°C) G000 Figure 42. Linearity Improvement SBOU123A – March 2012 – Revised September 2016 XTR108EVM-USB Evaluation Board and Software Tutorial Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated... -
Page 56: Ref
= 0.65*(5*I REF_MIN = 1.35*(5*I REF_MAX )*[1 - G *(RTD )]*R OUT_MAX OUT_MIN 50*A *(RTD - RTD XTR108EVM-USB Evaluation Board and Software Tutorial SBOU123A – March 2012 – Revised September 2016 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated... - Page 57 + dR LIN_A (0.5 + B )*RTD - (0.5 - B )*RTD - 2*B = round(16*G LIN_A SBOU123A – March 2012 – Revised September 2016 XTR108EVM-USB Evaluation Board and Software Tutorial Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated...
- Page 58 = round 13_A ZPGM ZPGM 13_A + dI - 35*I ZERO ZERO ZPGM = round 12_A ZPGM XTR108EVM-USB Evaluation Board and Software Tutorial SBOU123A – March 2012 – Revised September 2016 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated...
- Page 59 Use the following equation to convert output voltage to output current. Mnemonic Commands The USB-DAQ platform uses a set of mnemonic commands to perform SPI communications to the XTR108EVM-USB. These commands are given in Table Table 31. Mnemonic Commands...
- Page 60 The USB-DAQ Platform SPI protocol supports four clock and data line modes of operation. These modes are summarized in Table 32. The first mode, BREH, is used by the XTR108EVM-USB. Table 32. SPI Modes of Operation Mode Clock Polarity Description (CPOL) Clock Transition for Data Polarity Description (CPHA) Data are read by the USB-DAQ on the clock rising edge.
- Page 61 STANDARD TERMS AND CONDITIONS FOR EVALUATION MODULES Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, or documentation (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms and conditions set forth herein. Acceptance of the EVM is expressly subject to the following terms and conditions.
- Page 62 FCC Interference Statement for Class B EVM devices NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
- Page 63 【無線電波を送信する製品の開発キットをお使いになる際の注意事項】 開発キットの中には技術基準適合証明を受けて いないものがあります。 技術適合証明を受けていないもののご使用に際しては、電波法遵守のため、以下のいずれかの 措置を取っていただく必要がありますのでご注意ください。 1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用 いただく。 2. 実験局の免許を取得後ご使用いただく。 3. 技術基準適合証明を取得後ご使用いただく。 なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。 上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。 日本テキサス・イ ンスツルメンツ株式会社 東京都新宿区西新宿６丁目２４番１号 西新宿三井ビル 3.3.3 Notice for EVMs for Power Line Communication: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page 電力線搬送波通信についての開発キットをお使いになる際の注意事項については、次のところをご覧くださ い。http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page SPACER EVM Use Restrictions and Warnings: 4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS.
- Page 64 Notwithstanding the foregoing, any judgment may be enforced in any United States or foreign court, and TI may seek injunctive relief in any United States or foreign court. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2015, Texas Instruments Incorporated...
- Page 65 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue.
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