Texas Instruments UCD9081 User Manual
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Texas Instruments UCD9081 User Manual

Power supply sequencer and monitor evm
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UCD9081 Power Supply Sequencer and Monitor EVM
This user's guide describes the operation of the UCD9081 Power Supply Sequencer evaluation module
(EVM) and graphical user interface (GUI).
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SLVU249 - September 2008
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UCD9081 Power Supply Sequencer and Monitor EVM
User's Guide
SLVU249 - September 2008
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Summary of Contents for Texas Instruments UCD9081

  • Page 1: Table Of Contents

    User's Guide SLVU249 – September 2008 UCD9081 Power Supply Sequencer and Monitor EVM This user’s guide describes the operation of the UCD9081 Power Supply Sequencer evaluation module (EVM) and graphical user interface (GUI). Contents ......................System Overview ......................Hardware Overview ........................

  • Page 2: System Overview

    • External voltage rails—when configured properly, UCD9081EVM can sequence and monitor external voltage source as well. • UCD9081EVM—EVM board that houses the UCD9081 and peripheral circuits. The EVM can sequence and monitor onboard as well as external voltage rails, as previously explained.

  • Page 3: Ucd9081Evm Functionality

    • LEDs for board power and power supply enables for quick visible indication of power supply status The eight power supplies, provided on the UCD9081EVM, are a combination of low-dropout regulators (LDO), power converter integrated circuits (IC), and power converter modules, all from Texas Instruments (TI).
  • Page 4 The J4 header provides a sequencing and monitoring interface to an external system, rather than to the eight supplies provided on the EVM. Each of the eight power supply rails supported by the UCD9081 has an enable and a monitoring pin accessible at J4. Through the use of jumpers for the monitor pins, the user can choose to monitor either the external rails or the internal EVM rails.

  • Page 5: Ucd9081 Jumpers

    Voltage Reference The UCD9081 can operate with either the internal voltage reference or an external voltage reference selectable using the GUI. Voltage reference selection depends on the monitoring accuracy required. The UCD9081EVM provides an accurate external reference to the V pin of the UCD9081.

  • Page 6: Ucd9081Evm Hookup

    UCD9081EVM. 1. Connect the power source to the board and enable the power source. The red D4 LED (labeled Power On) illuminates. You then observe D1 and D5–D11 illuminate, indicating that the UCD9081 is operating.

  • Page 7: Gui Overview

    2.0 of the Microsoft .NET Framework installed on your PC in order to run the GUI. 3. Once you have installed the .NET Framework and the UCD9081EVM GUI, you can launch the application. SLVU249 – September 2008 UCD9081 Power Supply Sequencer and Monitor EVM Submit Documentation Feedback...

  • Page 8: Gui Main Window

    The GUI main window helps you monitor the EVM sequencer status and configure the EVM sequencer through the File and View menus. Figure 4. GUI Main Window The UCD9081 EVM main window GUI has these areas: • System Status—Red box fill indicates an error. Clear control erases the error. – I2C Error –...

  • Page 9: Gui Help Window

    • Allow Self Dependencies— lets the user choose a rail to be dependent on itself • Sequence after Update— allows an automatic sequence of the UCD9081 after the parameters are updated, or this sequence can be done manually if need be.

  • Page 10: Gui System Configuration Window

    These shutdown delay fields correspond to the UnsequenceTime registers in the UCD9081 device data sheet (SLVS813). • Voltage Reference—selects the device voltage reference. The UCD9081EVM is configured by default to use the external reference (VCC supply for the sequencer).
  • Page 11 • Retry Continuously—when an error on the selected rail happens, a retry occurs. A retry is an attempt by the UCD9081 to restart the corresponding power supply by disabling the rail (with ENx pin) and then reenabling the rail. This repeats until the power supply rail alarm clears.

  • Page 12: Gui Gpo Configuration Window

    • Parent (V)—voltage at which the parent rail must be before this GPO is enabled User Data window Specific user data can be stored within the UCD9081 device by entering the text in the User Data window as shown in Figure Figure 9.

  • Page 13: Evm Design Configuration Information

    The EVM rail output voltage set points are configurable by changing the output voltage set-point resistors. The UCD9081 directly monitors RAIL1, RAIL2, RAIL3, and RAIL4 (no feedback divider resistors), and these rail output voltages must never be set above the reference voltage being used. RAIL5, RAIL6, RAIL7, and RAIL8 have the feedback divider resistors present and as such, these rail output voltages can be higher than the currently used voltage reference.
  • Page 14 If the pin pullup/pulldown configuration jumpers are changed while the GUI is operating and a device reset occurs, then the GUI communication may be affected (perform Discover to re-acquire the EVM I C address. UCD9081 Power Supply Sequencer and Monitor EVM SLVU249 – September 2008 Submit Documentation Feedback...

  • Page 15: Evm Schematic

    EVM Schematic www.ti.com EVM Schematic SLVU249 – September 2008 UCD9081 Power Supply Sequencer and Monitor EVM Submit Documentation Feedback...

  • Page 16: Bill Of Materials

    0.870 × 0.495 Module, Wide Output Adj, 6A, 0.8V to 3.6V, 5V Input PTH05050WAH IC, Micropower Shunt Voltage Reference 100 ppm/°C, SOT23 LM4041BIDBZ 45 µA-12 mA, Adjustable UCD9081 Power Supply Sequencer and Monitor EVM SLVU249 – September 2008 Submit Documentation Feedback...

  • Page 17: Related Documentation From Texas Instruments

    • TPS76901, Ultralow-Power 100-mA Low-Dropout Linear Regulator data sheet (SLVS203) • PTH04070W, 3-A, 3.3/5-V Input Adjustable Switching Regulator data sheet (SLTS227) • PTH05050, 6-A, 5-V Input Non-Isolated Wide-Output Adjust Power Module data sheet (SLTS213) SLVU249 – September 2008 UCD9081 Power Supply Sequencer and Monitor EVM Submit Documentation Feedback...
  • Page 18 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 19 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.
  • Page 20 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments UCD9081EVM...

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