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Texas Instruments PGA309EVM-USB manuel d'utilisation

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Table des matières du manuel d’utilisation

  • Page 1

    User's Guide SBOU084 – February 2010 PGA309EVM-USB This user’s guide describes the characteristics, operation, and use of the PGA309EVM-USB evaluation module (EVM). This EVM is designed to evaluate the performance of the PGA309 , a voltage output, programmable sensor conditioner. This document covers all pertinent areas involved to properl[...]

  • Page 2

    Introduction and Overview www.ti.com List of Tables 1 PGA309 Test Board Parts List ........................................................................................... 12 2 J1 Pinout (25-Pin Male DSUB) .......................................................................................... 14 3 J2 Pinout (25-Pin Female DSUB) ..............[...]

  • Page 3

    www.ti.com Introduction and Overview 1.1 PGA309EVM-USB Hardware Figure 1 shows the hardware included with the PGA309EVM-USB kit. Contact the factory if any component is missing. It is highly recommended that you check the TI web site (at http://www.ti.com ) to verify that you have the latest software. It is also recommended that you refer to the PG[...]

  • Page 4

    Introduction and Overview www.ti.com 1.2 Related Documentation from Texas Instruments The following documents provides information regarding Texas Instruments integrated circuits used in the assembly of the PGA309EVM-USB. This user's guide is available from the TI web site under literature number SBOU084 . Any letter appended to the literature[...]

  • Page 5

    USBDAQ Platform PGA309 T estBoard EVM Power PGA309 V Supply Switched5.0VPower DUT One- WireInterface 25-Pin MaleDSUBSignals FromUSBDAQPlatform 25-Pin F emaleDSUBSignals FromUSBDAQPlatform I C Interface 2 4mAto20mA I/VConverter Sensor Connection Sensor Emulator www.ti.com System Setup 2 System Se[...]

  • Page 6

    System Setup www.ti.com The PGA309_Test_Board also has an onboard sensor emulator. The sensor emulator is a circuit that generates the same type of signals generated by a bridge sensor. The sensor emulator circuit is controlled by the PGA309EVM-USB software. Using the sensor emulator allows you to get a deeper understanding of the PGA309EVM-USB sof[...]

  • Page 7

    www.ti.com System Setup Figure 4. PGA309_Test_Board Schematic: Input Circuitry 7 SBOU084 – February 2010 PGA309EVM-USB Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated[...]

  • Page 8

    System Setup www.ti.com Figure 5. PGA309_Test_Board Schematic: Power, Reference, and Digital Connections 8 PGA309EVM-USB SBOU084 – February 2010 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated[...]

  • Page 9

    www.ti.com System Setup Figure 6 shows the output section of the PGA309EVM_Test_Board. There are two output options: voltage output and current output. The voltage output option is selected by placing JMP9 in the NC position. The current output option is selected by moving JMP9 to the V OUT to XTR position. Figure 6. PGA309_Test_Board Schematic: Ou[...]

  • Page 10

    System Setup www.ti.com Figure 7 shows the sensor emulator circuit. The sensor emulator generates signals to help users evaluate the PGA309. No part of this circuit is required in your final design. The sensor emulator uses a DAC8555 (U8) to generate an emulated temperature signal, common-mode signal, and differential signal. These signals can be c[...]

  • Page 11

    www.ti.com System Setup Figure 8 illustrates the two 25-pin D-SUB connectors J1 and J2. These connectors provide all the signals necessary to communicate with the PGA309. U5 is the EEPROM used to store the calibration look-up table used with the PGA309. Figure 8. PGA309_Test_Board Connections to USB-DAQ-Platform and EEPROM 11 SBOU084 – February 2[...]

  • Page 12

    System Setup www.ti.com 2.3 PGA309_Test_Board Parts List Table 1 describes the parts list for the PGA309_Test_Board. Table 1. PGA309 Test Board Parts List Qty Value Ref Des Description Vendor Part Number Capacitor, ceramic 560pF 50V NP0 1 560pF C6 Panasonic - ECG ECJ-1VC1H561J 0603 Capacitor, ceramic 560pF 50V NP0 3 100pF C3 C5, C13 ECJ-1VC2A101J 0[...]

  • Page 13

    www.ti.com System Setup Table 1. PGA309 Test Board Parts List (continued) Qty Value Ref Des Description Vendor Part Number JMP1, JMP2, JMP3, JMP4, JMP5, JMP6, JMP7, JMP8, JUMP2 Cut Terminal strip, 3-position, .100 17 JMP9, JMP10, JMP11, Samtec TSW-103-07-G-S to Size centers, .025 square pins JMP12, JMP13, JMP14, JMP15, JMP16, JMP17, V_Sensor, OPA_O[...]

  • Page 14

    System Setup www.ti.com 2.4 PGA309_Test_Board: Signal Definitions and Pinouts This section provides the signal definitions for the PGA309_Test_Board. 2.4.1 J1 (25-Pin Male DSUB) Table 2 shows the different signals connected to J1 on the PGA309_Test_Board. This table also identifies signals connected to pins on J1 that are not used on the PGA309_Tes[...]

  • Page 15

    www.ti.com System Setup 2.4.2 J2 (25-Pin Female DSUB) Table 3 shows the different signals connected to J2 on the PGA309_Test_Board. This table also identifies signals connected to pins on J2 that are not used on PGA309_Test_Board. Table 3. J2 Pinout (25-Pin Female DSUB) Pin on J2 Signal Used on This EVM PGA309 Pin 1 NC No 2 CTRL1 Yes Convert 3 CTRL[...]

  • Page 16

    TUSB3210 8052 C withUSBInterface andUART m USBBus F romComputer 3.3V Regulator Adjustable Regulator V (2.7Vto5.5V) CC V m C 3.3V S V_USB 5V 8Kx8Byte EEPROM Buffers and Latches Power Switching V (2.7Vto5.5V) DUT SwitchedPower I C,SPI ControlBits,and MeasureBits 2 External Power (6V ) DC Reset Button and P[...]

  • Page 17

    www.ti.com PGA309EVM-USB Hardware Setup 3.2 Typical Hardware Connections To set up the PGA309EVM-USB hardware, connect the two halves of the EVM together, apply power, and then connect the external sensor. Figure 10 shows the typical hardware connections. Figure 10. PGA309EVM-USB Typical Hardware Connections 17 SBOU084 – February 2010 PGA309EVM-U[...]

  • Page 18

    PGA309EVM-USB Hardware Setup www.ti.com 3.3 Connecting the Hardware To connect the two PCBs of the PGA309EVM-USB together, gently push on both sides of the D-SUB connectors (as shown in Figure 11 ). Make sure that the two connectors are completely pushed together; that is, loose connections may cause intermittent operation. Figure 11. Connecting th[...]

  • Page 19

    www.ti.com PGA309EVM-USB Hardware Setup 3.4 Connecting Power After the two parts of the PGA309EVM-USB are connected, as shown in Figure 12 , connect the power to the EVM. Always connect power before connecting the USB cable. If you connect the USB cable before connecting the power, the computer will attempt to communicate with an unpowered device t[...]

  • Page 20

    PGA309EVM-USB Hardware Setup www.ti.com 3.5 Connecting the USB Cable to the PGA309EVM-USB Figure 13 shows the typical response to connecting the USB-DAQ-Platform to a PC USB port for the first time. Note that the EVM must be powered on before connecting the USB cable. Typically, the computer will respond with a Found New Hardware, USB Device pop-up[...]

  • Page 21

    www.ti.com PGA309EVM-USB Hardware Setup 3.6 PGA309EVM-USB Jumper Settings Figure 14 illustrates the default jumpers configuration for the PGA309_Test_Board. In general, the jumper settings of the USB-DAQ-Platform do not need to be changed. You may want to change some of the jumpers on the PGA309_Test_Board to match your specific sensor conditioning[...]

  • Page 22

    PGA309EVM-USB Hardware Setup www.ti.com Figure 15 shows the default jumpers configuration for the USB-DAQ-Platform. In general, the jumper settings of the USB-DAQ-Platform do not need to be changed. Figure 15. Default Jumper Settings (USB-DAQ-Platform) Table 4 explains the function of the jumpers on the PGA309_Test_Board. Table 4. PGA309_Test_Board[...]

  • Page 23

    www.ti.com PGA309EVM-USB Hardware Setup Table 5 describes the function of the jumpers in the Miscellaneous connections section of the PGA309 Test Board. Table 5. PGA309_Test_Board Jumper Functions: Miscellaneous Connections Jumper Default Purpose JMP1, JMP2 NC For JMP1 = NC , JMP2 = V REF EXT : The REF pin on the PGA309 is configured for internal r[...]

  • Page 24

    PGA309EVM-USB Hardware Setup www.ti.com Table 7 explains the function of the USB-DAQ-Platform jumpers. For most applications the default jumper position should be used. A separate document gives details regarding the operation and design of the USB-DAQ-Platform. Table 7. USB-DAQ-Platform Jumper Settings Jumper Default Purpose JUMP1 EXT This jumper [...]

  • Page 25

    www.ti.com PGA309EVM-USB Software Overview 4 PGA309EVM-USB Software Overview This section discusses how to install and use the PGA309EVM-USB software. 4.1 Operating Systems for PGA309 Software The PGA309EVM-USB software has been tested on the Microsoft Windows XP operating system (OS) with United States and European regional settings. The software [...]

  • Page 26

    PGA309EVM-USB Software Overview www.ti.com 4.5 Registers Tab Figure 16 illustrates the Registers tab. Figure 16. PGA309EVM-USB Software: Registers Tab This tab presents a Register Table that shows a summary of the PGA309 device registers. You can select and toggle various sections of the table by clicking on the table with your mouse. For example, [...]

  • Page 27

    www.ti.com PGA309EVM-USB Software Overview 4.6 EEPROM Table Tab The EEPROM Table tab is shown in Figure 17 . Figure 17. PGA309EVM-USB Software: EEPROM Tab This tab offers a debug utility that allows you to view, load, edit, and save various EEPROM values. This tab also contains displays for the two different sections of the PGA309 EEPROM. However, [...]

  • Page 28

    PGA309EVM-USB Software Overview www.ti.com 4.7 Block Diagram Tab The Block Diagram tab (shown in Figure 18 ) gives you full access to all the elements in the PGA309. Making a change to the block diagram is reflected in the Register Table (see Section 4.5 ). This feature is helpful when experimenting with your specific setup. Figure 18. PGA309EVM-US[...]

  • Page 29

    www.ti.com PGA309EVM-USB Software Overview 4.8 Auto Calibrate Tab The Auto Calibrate tab is used to calibrate a PGA309 module over temperature. This process can be done with a real-world sensor or with an emulated sensor. It is recommended that you first become familiar with the calibration process by using the sensor emulator. Once the user comple[...]

  • Page 30

    PGA309EVM-USB Software Overview www.ti.com Select the type of temperature sensor that you want to emulate using the Define Temperature Sensor Model control. Depending on the type of temperature sensor selected, you may need to provide some additional information about the sensor (for example, R T resistance, Bridge Resistance, and drift). You may a[...]

  • Page 31

    www.ti.com PGA309EVM-USB Software Overview 4.8.2 PGA Setup Functions Figure 21 illustrates the PGA Setup sub-tab. Figure 21. PGA309EVM-USB Software: Auto Calibrate Tab—PGA Setup The PGA Setup sub-tab is divided into six sections. Each section is identified as a sequential step: Step 1. PGA309 Hardware Connections Step 2. PGA309 Initial Register S[...]

  • Page 32

    PGA309EVM-USB Software Overview www.ti.com 4.8.3 Two-Point Calibration and Linearization Functions The Two-Point Calibration and Linearization sub-tab is illustrated in Figure 22 . Figure 22. PGA309EVM-USB Software: Auto Calibrate Tab—Two-Point Calibration and Linearization This sub-tab performs the room temperature calibration. To perform this c[...]

  • Page 33

    www.ti.com PGA309EVM-USB Software Overview 4.8.4 Temperature Error Compensation Functions Figure 23 shows the Temperature Error Compensation sub-tab. Figure 23. PGA309EVM-USB Software: Auto Calibrate Tab—Temperature Error Compensation The Temperature Error Compensation sub-tab is divided into six separate measurements (refer to Figure 23 ). When [...]

  • Page 34

    PGA309EVM-USB Software Overview www.ti.com 4.8.5 Post Cal Error Check The Post Cal Error Check sub-tab is illustrated in Figure 24 . Figure 24. PGA309EVM-USB Software: Auto Calibrate Tab—Post Cal Error Check This sub-tab is used to test post-calibration accuracy. This feature only works for the sensor emulator mode. Press the Read Post Calibratio[...]

  • Page 35

    www.ti.com PGA309EVM-USB Software Overview 4.8.6 DMM Options Figure 25 shows the DMM Options sub-tab. Figure 25. PGA309EVM-USB Software: Auto Calibrate Tab—DMM Options It is possible to use an external digital multimeter (or DMM) to calibrate sensor modules. The current version of the PGA309EBM-USB software provides the capability for the Agilent[...]

  • Page 36

    Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling th[...]

  • Page 37

    IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders[...]