Texas Instruments UCD9081 Manuale utente

User's GuideSLVU249 – 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).

Contents1 System Overview ............................................................................................................ 22 Hardware Overview.......................................................................................................... 23 GUI Overview ................................................................................................................ 74 EVM Design Configuration Information .................................................................................. 135 EVM Schematic............................................................................................................. 156 Bill of Materials ............................................................................................................. 167 Related Documentation From Texas Instruments ..................................................................... 17

List of Figures

1 System Block Diagram ...................................................................................................... 22 UCD9081EVM Functionality ................................................................................................ 33 UCD9081EVM Hookup ..................................................................................................... 64 GUI Main Window ........................................................................................................... 85 GUI Help Window ............................................................................................................ 96 GUI System Configuration Window ...................................................................................... 107 GUI Rail Configuration Window .......................................................................................... 108 GUI GPO Configuration Window ........................................................................................ 129 GUI User Data Window ................................................................................................... 12

List of Tables

1 UCD9081 Jumpers .......................................................................................................... 5

Windows is a trademark of Microsoft Corporation.I

C is a trademark of Philips Corporation.

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1 System Overview

UCD9081

2 Hardware Overview

System Overview

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The system block diagram is shown in Figure 1 .

Figure 1. System Block Diagram

The system consists of these components:•Host (PC)—a Windows™ personal computer (PC) – used to configure and monitor the UCD9081EVM.The GUI operates on the host. For the GUI to execute properly, the host needs to have the Windows.NET v2.0 Framework installed.•USB-to-I

C adapter—UCD9081EVM uses the I

C™ interface for communication with the host. TheTI-supplied USB-to-I

C adapter does the appropriate conversion so the host can use the USB interfacefor communication.

•Power source—UCD9081EVM requires a 5-V, 0.5-A power source. This power is used by theUCD9081, LEDs, and onboard rails, if used.•External voltage rails—when configured properly, UCD9081EVM can sequence and monitor externalvoltage source as well.•UCD9081EVM—EVM board that houses the UCD9081 and peripheral circuits. The EVM can sequenceand monitor onboard as well as external voltage rails, as previously explained.

The UCD9081EVM allows evaluation of the UCD9081 Power Supply Sequencer and Monitor with ErrorLogging. The UCD9081 is a highly configurable, 8-channel power supply sequencer (see the SLVS813data sheet) with three additional general-purpose digital outputs.

The UCD9081EVM can be configured and monitored through a Windows GUI application running on aPC. The GUI communicates with the UCD9081EVM through the USB Interface Adapter (included withEVM kit), which acts as an I

C master for the board.

The UCD9081EVM and associated functional controls are shown in Figure 2 .

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RAIL 1-RAIL8

TP1-TP8

PS Input/UV Fault

JP21-JP28

PS Monitor

JP1-JP8

Ext, ENx and MONx

PS Enable PU/PD

JP9-JP16

I C Address Selection

JP17-JP20

UCD9080

I C Communication

5 V AC Adapter In

5 V Lab Supply In

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Hardware Overview

Figure 2. UCD9081EVM Functionality

The UCD9081EVM provides the following functionality:•Sequencing for the eight onboard power supply rails•Monitoring for the eight onboard power supply rails•Power supply enables can be sent off board via a header to sequence external power supplies.•External power supplies can be monitored by connecting them to an onboard header (jumpers selectonboard or offboard monitoring).•Sequencing for the general-purpose outputs•Jumpers for configuring the I

C address of the UCD9081 (detected at start-up)•Standard 100-kHz I

C communication via I

C connector to USB adapter for connection to a PC•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).

Rails 1-6 have a TI TPS76901 LDO for generating voltages from 1.4 V to 2.4 V. Rail 7 has a TI PTH04070switching power supply IC for generating a 2.6-V output. Rail 8 has a TI PTH05050 power module usedfor generating a 2.8-V output. This set of power supplies are provided for generating different outputvoltages on the board for the testing of different sequencing and monitoring conditions.

Users can communicate with the board using the I

C protocol through the supplied USB Interface Adapterand GUI. The GUI helps users to change the sequencer configuration as well as monitor voltage anddevice status from a Windows PC.

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2.1 Connectors

Hardware Overview

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The UCD9081EVM has connectors for power and I

C communications. J1 provides input power interfacefrom an external 5-V adapter and J5 provides a laboratory power supply interface to the UCD9081EVM.

J3 provides the I

C communication interface to the UCD9081EVM. The USB Interface Adapter includes aribbon cable that can be connected to J3. The adapter is connected to a Windows-based PC.

The J4 header provides a sequencing and monitoring interface to an external system, rather than to theeight supplies provided on the EVM. Each of the eight power supply rails supported by the UCD9081 hasan enable and a monitoring pin accessible at J4. Through the use of jumpers for the monitor pins, the usercan choose to monitor either the external rails or the internal EVM rails.

CAUTION

Ensure that if you are configuring the UCD9081EVM to monitor an externalpower supply, the voltage is appropriately scaled down to between 0 V – 2.5 V(if using the internal reference) or between 0 V – 3.3 V (if using the externalreference).

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2.2 Jumpers

2.3 Test Points

2.4 Voltage Reference

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Hardware Overview

The UCD9081EVM operation can be configured using jumpers:•Onboard or external power supply voltage monitoring•Onboard or external power supply enabling•Setting of the I

C address for the system•Creating undervoltage faults for the onboard power supplies

See Table 1 for descriptions and default settings for the jumpers on the UCD9081EVM.

Table 1. UCD9081 Jumpers

Number Function Default Setting

JP1–JP8 Power supply monitoring through onboard power supplies or externally connected. Pins 1-2 (onboardConnect to pins 1-2 for monitoring onboard supplies and pins 2-3 for external supplies via supplies)connector J4.JP9–JP16 Power supply enable signal configuration ( pullup or pulldown). Enable pins for each of Pins 1-2 (pullup to 3.3 Vthe channels can be either pulled up to 3.3 V or down to ground to support power for active-low supplysupplies that have either active-high or active-low enables. Connect to pins 1-2 for pulling enables).up to 3.3 V and connect to pins 2-3 for pulling down to ground.JP17–JP20 I

C address detection. Four digital signals on the UCD9081 are sampled at start-up to Pins 2-3 (pulldown todetermine its I

C address. These four jumpers control, if the signals are pulled up to 3.3 V ground for all zero).or down to ground. Connect to pins 1-2 for 3.3 V and connect to pins 2-3 for ground.JP21–JP28 Undervoltage fault. For each rail, you can generate an undervoltage fault by removing this Jumper on pins 1-2 forjumper. Removal of these jumpers removes input from the power supplies, causing the no undervoltage fault.output voltage being monitored by the UCD9081 to fall below the configured undervoltagethreshold. If the UV threshold is zero, no undervoltage occurs.JP29 EN8 shared with I

C address detection. Can be used to disconnect RAIL8 enable from Jumper on pins 1-2.the UCD9081.

The UCD9081EVM provides test points that can be used for evaluation. Important voltages can bemonitored with a meter through the use of the test points.

The UCD9081 can operate with either the internal voltage reference or an external voltage referenceselectable using the GUI. Voltage reference selection depends on the monitoring accuracy required. TheUCD9081EVM provides an accurate external reference to the V

pin of the UCD9081. When operatingwith the internally generated 2.5-V reference, the monitoring accuracy depends on the accuracy of theinternal voltage reference (see data sheet SLVS813 for details).

The default behavior of the device (and the EVM) is for an external voltage reference.

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2.5 EVM Operation

USB – I2C

Adapter

USB

Cable

Ribbon

Cable

5V Power

Source

PC with GUI

UCD9081EVM

Hardware Overview

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The UCD9081EVM operates from 5-V DC power from either a wall adapter (through J1) or from alaboratory power supply (through J5). The UCD9081EVM has light-emitting diodes (LED) for board powerand voltage rail enable indication. Use Figure 3 and the following steps to set up the UCD9081EVM.1. Connect the power source to the board and enable the power source. The red D4 LED (labeled PowerOn) illuminates. You then observe D1 and D5–D11 illuminate, indicating that the UCD9081 isoperating.

2. Next, connect the USB interface adapter to the UCD9081EVM J3 connector using the ribbon cableprovided. Plug the appropriate end of the USB cable into the adapter and the other end into your PC.GUI installation and operating instructions appear in Section 3.1 .

Note: For some configurations of the UCD9081 device, the installation of the JP29 jumper mayhave an effect on the I

C address of the device. The GUI "Discover Devices" menu item canbe used to re-discover the UCD9081 device I

C address.

Figure 3. UCD9081EVM Hookup

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3 GUI Overview

3.1 GUI installation

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GUI Overview

The UCD9081EVM comes with a Windows application that can be used to configure and monitor theEVM. The GUI can be used to configure all available options of the EVM such as sequencing andshutdown order, over/undervoltage timing, etc. It also can be used to monitor the operation of thesequencer by reporting current readings of voltage and error conditions on all the rails.

Before running the GUI application, ensure that the target hardware is connected as described inSection 2.5 .

Note: The UCD9081EVM application GUI is written using Microsoft .NET version 2 software andtherefore requires the .NET Framework installed on the PC to run the application. No otherdrivers or libraries are required to run the application.

1. To determine the .NET Framework software version, you must use the Windows Control Panel andselect Add/Remove Programs. The Control Panel lists all the installed PC software, and you candetermine if the proper Microsoft .NET Framework version is installed.

Note: To update your .NET Framework to version 2.0, go this URL:

http://www.microsoft.com/downloads/details.aspx?FamilyID=0856EACB-4362-4B0D-8EDD-

AAB15C5E04F5 & displaylang=en

2. To install the GUI, unzip the zip file that containing the GUI binary onto your PC. You must have atleast version 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 theapplication.

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3.2 UCD9081 GUI Main Window

GUI Overview

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The GUI main window helps you monitor the EVM sequencer status and configure the EVM sequencerthrough 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– Rail Error– Error Logs in Flash– Device Failure– Parameter Csum Error•Error Log—contains error messages that inform the user about the operation of the sequencer.•Statistics—I2C communication statistics.– I2C Write– I2C Read– I2C NACK•Rail Status—information including monitored voltage (scaled to user-entered divider ratios) and railerror status.•Update Parameters and Sequence button—Updates buffer-stored GUI information to device userflash memory and initiates a device sequence. This process takes a couple seconds, and then thesequencer is able to be monitored again.•Sequence button—causes the system to sequence.•Sequence All Devices button—causes all system devices to sequence.•Shutdown button— initiates a system shutdown.•Refresh button—causes the GUI window to refresh.•Menu bar— allows selection of File, View, Advanced, and Help menu items

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GUI Overview

The File menu includes these commands:•Load Configuration—loads a previously saved parameter (*.par) file.•Save Configuration—saves the current GUI configuration to either a user parameter file (parextension) or an Intel Hex format file (hex extension).•Default Configuration— loads the factory UCD9081 configuration values (NULL configuration).•EVM Configuration— loads EVM-friendly UCD9081 configuration values.•Save I2C Transactions—generates an ASCII text file containing configuration-specific I

Ctransactions (to be used by a master host to configure the UCD9081).•Auto-Refresh—refresh the window contents periodically, if selected. If you want to refresh the windowcontents manually, click the Refresh button (not available when auto-refresh is enabled).•Discover Devices—discover the slave (EVM as jumper-configured) I

C address (displayed at thebottom of the form).•Select Device— allows the GUI to select which device is used if more than one device is on the bus.•Exit—stop the GUI application

The View menu includes these commands:•System Configuration—provides system voltage reference and shutdown delay field entries.•Rail Configuration—provides rail configuration field entries. All Rails simultaneously opens all railforms for comparison setup.•GPO Configuration—provides GPO configuration field entries. All general-purpose outputs (GPO)simultaneously open all GPO windows for setup comparisons.•User Data—provides specific user data to be uploaded to the device, such as customer-specificidentification.

The Advanced menu includes these commands:•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 areupdated, or this sequence can be done manually if need be.

The Help menu allows the user to view the GUI revision, device type, and device version as shown inFigure 5 .

Figure 5. GUI Help Window

The GUI-detected I

C address is displayed at the bottom of the GUI Main Window. Users can change thedetected I

C address on the EVM by modifying the state of jumpers JP17–JP20. If the jumpers arechanged during GUI operation and the device is sequenced, the user must perform a Discover Devicescommand as previously outlined.

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3.3 GUI System Configuration Window

3.4 GUI Rail Configuration Window

GUI Overview

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The System Configuration window on the GUI is shown in Figure 6 and allows the following to beconfigured in the UCD9081:

Figure 6. GUI System Configuration Window

•Shutdown Delays—specify shutdown delays for rails and GPOs. If a rail or GPO is marked to shutdown, then it shuts down according to the shutdown delays entered here. These shutdown delay fieldscorrespond to the UnsequenceTime registers in the UCD9081 device data sheet (SLVS813 ).•Voltage Reference—selects the device voltage reference. The UCD9081EVM is configured by defaultto use the external reference (VCC supply for the sequencer). When VCC is selected as the reference,the GUI provides for actual VCC calibration to be entered. For example, if the actual device VCCvoltage is 3.1 V, the GUI can use this to properly scale the displayed voltages.

Note: When the reference is changed and stored to the GUI buffer, the displayed rail voltages areincorrectly scaled, until the device parameters are updated.

•Pin Function Select—helps you select the EN8 or GPO1 function. The function selected disables theother function from being configured.•Sequence Control—Checking the Ignore Flash Error Log box allows the sequencer to restart whenerrors are present in flash. Default operation forces the user to manually clear the flash error before thesequencer will restart.•Store to Buffer and Close Buttons—The Store to Buffer button saves the current window entries to aGUI buffer, and the Close button closes the window without saving the form entries.

The Rail Configuration window on the GUI is shown in Figure 7 and permits you to configure theseUCD9081 items:

Figure 7. GUI Rail Configuration Window

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