Texas Instruments BUF20800 User Manual
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Texas Instruments BUF20800 User Manual

Texas Instruments BUF20800 User Manual

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BUF20800/20820EVM User Guide and Software Tutorial
This user's guide describes the characteristics, operation, and use of the BUF20800/20820EVM
evaluation board. It discusses how to set up and configure the software and hardware, and reviews
various aspects of the program operation. Throughout this document, the terms evaluation board,
evaluation module, and EVM are synonymous with the BUF20800/20820EVM. This document 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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PowerPAD is a trademark of Texas Instruments.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
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C is a trademark of NXP Semiconductors.
WinZIP is a registered trademark of WinZip International LLC.
All other trademarks are the property of their respective owners.
SBOU100 - April 2011
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BUF20800/20820EVM User Guide and Software Tutorial
© 2011, Texas Instruments Incorporated
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User's Guide
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  • Page 1: Table Of Contents

    SBOU100 – April 2011 BUF20800/20820EVM User Guide and Software Tutorial This user's guide describes the characteristics, operation, and use of the BUF20800/20820EVM evaluation board. It discusses how to set up and configure the software and hardware, and reviews various aspects of the program operation. Throughout this document, the terms evaluation board, evaluation module, and EVM are synonymous with the BUF20800/20820EVM.

  • Page 2: Overview

    OTP memory that allows the user to store the gamma voltages on-chip, which eliminates the need for an external EEPROM. The BUF20800/20820EVM is a platform for evaluating the performance of either the BUF20800 or BUF20820 under various signal, reference, and supply conditions. This document gives a general overview of the BUF20800/20820EVM, and provides a general description of the features and functions to be considered while using this evaluation module.

  • Page 3: Hardware Included With Buf20800/20820Evm Kit

    Overview www.ti.com BUF20800/20820EVM Kit Contents Table 1 summarizes the contents of the BUF20800/20820EVM kit. Figure 1 shows all of the included hardware. Contact the Texas Instruments Product Information Center nearest you if any component is missing. It is highly recommended that you also check the...

  • Page 4: Buf20800/20820Evm Hardware Setup

    The following documents provide information regarding Texas Instruments' integrated circuits used in the assembly of the BUF20800/20820EVM. This user's guide is available from the TI web site under literature number SBOU100. 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 5: Buf20800/20820Evm Board Block Diagram

    BUF20800/20820EVM Hardware Setup www.ti.com Theory of Operation for BUF20800/20820 Hardware A block diagram of the BUF20800/20820 test board hardware setup is shown in Figure 3. The functionality of the PCB is such that it provides connections to the I C™ interface and general-purpose inputs/outputs (GPIOs) on the USB_DIG_Platform board.
  • Page 6 BUF20800/20820EVM Hardware Setup www.ti.com Signal Definitions of J1 (25-Pin Male DSUB) Table 2 lists the different signals connected to J1 on the BUF20800/20820EVM test board. Table 2. Signal Definition of J1 (25-Pin Male DSUB) on BUF20800/20820EVM Board Pin on J1...

  • Page 7: Buf20800/20820Evm Hardware Overview

    Theory of Operation for USB_DIG_Platform Figure 4 shows the block diagram for the USB_DIG_Platform. This platform is a general-purpose data acquisition system that is used on several different Texas Instruments evaluation modules. The details of its operation are included in a separate document, SBOU058 (available for download at www.ti.com).

  • Page 8: Typical Hardware Connections For Buf20800/20820Evm

    Typical Hardware Connections To set up the BUF20800/20820EVM hardware, connect the two PCBs of the EVM together, and apply a power source to the BUF20800/20820EVM test board. The external connections may be the real-world system that the BUF20800 or BUF20820 will be incorporated into.

  • Page 9: Connecting External Power To The Evm

    BUF20800/20820EVM Hardware Overview www.ti.com Connecting the Hardware To connect the two PCBs of the BUF20800/20820EVM together, gently push on both sides of the DSUB connectors (as shown in Figure 6). Note that the USB_DIG_Platform board has two DSUB connectors; either may be used. Make sure that the two connectors are completely pushed together; loose connections may cause intermittent operation.

  • Page 10: Connecting The Usb Cable To The Usb_Dig_Platform

    Once power is connected, the USB cable must be connected to the USB_DIG_Platform, as shown in Figure 7. Note that the BUF20800/20820EVM test board and the USB_DIG_Platform board must each be powered on before connecting the USB cable. Typically, the computer will respond with a Found New Hardware, USB Device pop-up dialog.

  • Page 11: Buf20800/20820Evm Default Jumper Settings

    C address on the DUT. Figure 9. BUF20800/20820EVM Default Jumper Settings Jumpers 1 through 4 on the BUF20800/20820EVM are all typically set to the same position. When set to the INT position, the signals from the digital supply (JMP1) and the digital communication lines (JMP2-JMP4) are generated and controlled from the USB_DIG_Platform or by the onboard bank select switch.
  • Page 12 This jumper selection depends on the configuration of JMP4. In the event that JMP4 is set to INT, JMP5 is used to select whether or not the LD pin on the BUF20800 or BUF20820 is connected to the DV digital supply or whether the LD pin is connected to ground.
  • Page 13 This section describes some of the hardware features present on the BUF20800/20820 test board. 3.7.1 JMP1: DV Control Setting Jumper JMP1 selects where the BUF20800 or BUF20820 digital supply pin is connected. If JMP1 is set to the INT position, the DV pin is connected to the switchable V signal generated from the USB_DIG_Platform.
  • Page 14 JMP4: LD Control Setting Jumper JMP4 selects which input the LD latch pin of the BUF20800 or BUF20820 is connected to. If JMP4 is set in the INT position, it is routed through the JMP5 jumper where the reference voltage can be...

  • Page 15: Buf20800/20820Evm Software

    38-pin, QFN/MLF test socket that allows the user to evaluate and program many devices very quickly. One drawback to this socket is that there is no connection to the PowerPAD™ of the BUF20800 or BUF20820 DUT. Because of this limitation, while in this socket, the BUF20800/20820 device cannot operate at its full output capability as a result of thermal dissipation restrictions.

  • Page 16: Buf20800/20820Evm Software Installation

    BUF20800/20820EVM Software www.ti.com Once the files are extracted, navigate to the BUF20800/20820EVM folder you created on the hard drive. Locate the setup.exe file and execute it to start the installation, as shown in Figure Figure 10. BUF20800/20820EVM Software Installation After the installation process initializes, the user is given the choice of selecting the directory in which to install the program;...

  • Page 17: Buf20800/20820Evm Software Overview

    Figure 12. BUF20800/20820EVM Software Installation Progress Software Description and Set-Up The BUF20800/20820EVM software allows the user to read and write to all registers in the BUF20800/20820 gamma correction buffer. Furthermore, it allows programming of the OTP register on the BUF20820. The software also permits the user to select either I C address.

  • Page 18: Buf20800/20820Evm Software Interface

    BUF20800/20820EVM Software Overview www.ti.com Starting the BUF20800/20820EVM Software The BUF20800/20820 software can be operated through the Windows Start menu. From Start, select All Programs; then select the BUF20800/20820EVM program. Figure 14 illustrates how the software should appear if the BUF20800/20820EVM is functioning properly.

  • Page 19: Buf20800/20820Evm Software: Communication Error With The Usb_Dig_Platform

    Figure 16 shows how the hardware and software must both be set to allow for communication between the BUF20800/20820EVM and the software. Without jumper JMP6 and the software address button configured correctly, the software will not be able to communicate with the BUF20800/20820 device.

  • Page 20: Measuring And Entering Power-Supply Voltage

    1024 5.2.3 Read DAC Button By pressing the Read DAC button in the BUF20800/20820EVM software, all of the BUF20800/20820 DAC/V registers are read to obtain the respective current register contents. Once the read procedure is complete, all of the corresponding text boxes are updated to show the current values present in the DAC/V registers.

  • Page 21: Auto Write Feature Enabled

    Reset Button Pressing the Reset button in the BUF20800/20820EVM software performs two functions. The first function is to call a General-Call Reset for the BUF20800 or BUF20820. The status of the DAC/V registers after this General-Call Reset has been used depends on the DUT on the EVM.

  • Page 22: Save To File Dialog Box Button And Window

    PC. It is a good idea to create a directory exclusively for BUF20800/20820 DAC code (that is, gamma voltage) files. Enter a unique file name in the File name field to store your BUF20800/20820 register information. Press the OK button to save the file.

  • Page 23: Load From File Button And Window

    BUF20800/20820EVM Software Overview www.ti.com 5.2.7 Load From File Button The BUF20800/20820EVM software is also able to load data saved from previous evaluations. A saved register configuration can be loaded into the BUF20800/20820 using the Load From File button, as shown in Figure 22.

  • Page 24: Run Batch Dialog Button And Window

    Figure 23 shows. The delay time is the amount of time allowed between loading new configurations into the BUF20800/20820 DUT. Use the Single Step Up and Single Step Down buttons to step through the selected files manually. The currently-selected file name is displayed in the lower left corner area of the dialog box. Double-click on the file names to select them.
  • Page 25 24. Simply drag the slider to adjust the desired channel output. The DAC code and corresponding output value of each channel change automatically. This function is similar to the slider present on the primary BUF20800/20820EVM software window that changes based on the channel that highlighted (as discussed in the above section).
  • Page 26 Program OTP All Channels Button (BUF20820 DUT Only) To configure the BUF20820 Program OTP function, make sure the device inserted into the BUF20800/20820 test board is the BUF20820. Also, be sure the BUF20820 is selected from the Buffer Model menu. As...

  • Page 27: Buf20800/20820Evm Documentation

    BUF20800/20820EVM Documentation www.ti.com BUF20800/20820EVM Documentation This section contains the complete bill of materials and schematic diagram for the BUF20800/20820EVM. Documentation information for the USB_DIG_Platform can be found in the USB_DIG_Platform User’s Guide, SBOU058, available at the TI web site at http://www.ti.com.
  • Page 28 BUF20800/20820EVM Documentation www.ti.com PCB Layouts Figure 27 shows the PCB component layout of the BUF20800/20820EVM. Figure 27. BUF20800/20820EVM PCB Top Layer (Component Side) BUF20800/20820EVM User Guide and Software Tutorial SBOU100 – April 2011 Submit Documentation Feedback © 2011, Texas Instruments Incorporated...
  • Page 29 Strip cut to JMP1- JMP8 Connector, Header 3-Position .100" SGL TSW-103-07-G-S Samtec size Gold Jumper JMP1- JMP8 LP W/Handle 2-Position 881545-2 AMP/Tyco Electronics SBOU100 – April 2011 BUF20800/20820EVM User Guide and Software Tutorial Submit Documentation Feedback © 2011, Texas Instruments Incorporated...
  • Page 30 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 the product(s) must have electronics training and observe good engineering practice standards.
  • Page 31 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 and should verify that such information is current and complete.

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