Texas Instruments UCD9080EVM Manuale utente

1 Hardware Overview

User's GuideSLVU184A – March 2007 – Revised February 2008

UCD9080 Power Supply Sequencer and MonitorEvaluation Module

This user’s guide describes how to install and operate the UCD9080 Power Supply Sequencer evaluationmodule (EVM) and graphical user interface (GUI) application. The guide covers the UCD9080EVM boardfunctionality and installation, the I

C adapter, plus how to install and use the application software.

Contents1 Hardware Overview.......................................................................................................... 12 System Overview ............................................................................................................ 43 GUI Overview ................................................................................................................ 54 EVM Design Configuration Information .................................................................................. 105 EVM Schematic and Bill of Materials .................................................................................... 126 Related Documentation From Texas Instruments ..................................................................... 14

List of Figures

1 UCD9080EVM ................................................................................................................ 32 System Block Diagram ...................................................................................................... 43 GUI Main Window ........................................................................................................... 64 GUI System Configuration Window ....................................................................................... 75 GUI Rail Configuration Window ............................................................................................ 86 GUI GPO Configuration Window .......................................................................................... 9

List of Tables

1 UCD9080 Jumpers .......................................................................................................... 4

The UCD9080 Power Supply Sequencer EVM is an evaluation module from Texas Instruments for theUCD9080 Power Supply Sequencer and Monitor. The UCD9080 is a highly configurable, 8-channel powersupply sequencer (see SLVS692 data sheet) with four additional general-purpose digital outputs.

The hardware can be configured and monitored through a Windows™ interface running on a PC. The GUIcommunicates with the hardware through the provided USB Interface Adapter, which acts as an I

Cmaster for the board.

This UCD9080EVM has this functionality:•Sequencing for up to eight power supplies on the board using digital enable signals•Monitoring for up to eight voltage rails on the board using analog signals•Power supply enables can be sent off board via a header for sequencing external power supplies(controlled using jumpers for each rail)•External voltage rails can be connected to a header on the board for monitoring external powersupplies (controlled using jumpers for each rail)•Sequencing for up to four digital outputs for reset circuits, etc.•Jumpers for configuring the I

C address of the UCD9080 (detected at start-up)•Standard 100-kHz I

C communication via I

C connector to USB adapter for connection toWindows is a trademark of Microsoft Corporation.Windows is a trademark of Microsoft Corporation.

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1.1 Voltage Reference

1.2 EVM Operation

Hardware Overview

Windows-based PC•LEDs for board power and power supply enables for quick visible indication of power supply status•Eight onboard LDOs and power supplies for sequencing and monitoring testing

The eight power supplies, provided on the UCD9080EVM, are a combination of low-dropout regulators(LDO), power converter ICs, and power converter modules, all from Texas Instruments.

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 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, plus monitor voltage and devicestatus from a Windows PC.

Because the UCD9080 monitors analog signals (voltage), its ability to accurately convert the value of therail voltages to digital values (for conversion to volts for the user) is a function of the quality of the voltagereference on the device.

The UCD9080 IC can run in one of two modes: internal reference or external reference (selectable via theGUI). When operating with the internally generated 2.5-V reference, the sampling accuracy is not as goodas is possible with the external reference (see data sheet SLVS692 for details). If measuring voltageaccurately to 5 mV is not required, then the internal reference is sufficient.

If the application requires better voltage monitoring accuracy, then the external reference (derived from theUCD9080 VCC pin) should be used. This EVM uses a shunt regulator that produces a clean 3.3-V supplyvoltage to the UCD9080. This regulator is only required to supply the UCD9080 VCC pin if the voltagereference is set to internal.

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

The UCD9080EVM requires power from an AC wall adapter through J1 or from a laboratory power supplythrough J5. This provides 5 V to power the LEDs, power supplies, and the UCD9080 (using a 3.3-V boardregulator). The UCD9080 begins operation as soon as power is applied to the EVM. The UCD9080EVMhas several LEDs to indicate board power and active enables for each onboard power supply.

Connect the power source to the board and enable the power source. The red LED labeled D4 illuminatesto indicate that the board has power . You should then observe D1 and D5–D11 illuminate, indicating theapplication is running.

Next, connect the USB interface adapter to the UCD9080EVM via the provided ribbon cable. Plug theUSB cable into the adapter and the other end into your PC. Instructions about how to run the GUI appearin a later section in this document.

Before power up, remove the jumper JP29. This jumper disconnects the I

C addresses from beingchanged during start-up. (This is one of the signals that the UCD9080 uses to detect and learn its I

Caddresses.)

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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

1.3 Connectors

Hardware Overview

Figure 1. UCD9080EVM

The UCD9080EVM has connectors for power and I

C communications. J1 is the connector for theexternal 5-V AC adapter. The J5 connector provides a laboratory power supply to power the EVM.

Connector J3 is for the I

C communication provided by the USB Interface Adapter included with this EVMkit. The USB Interface Adapter includes a ribbon cable that can be connected to J3. The adapter isconnected to a Windows-based PC via USB protocol.

The J4 header allows users to be able to sequence and monitor their own external power supplies, ratherthan the eight supplies provided on this board. Each of the eight power supply rails supported by theUCD9080 has an enable and a monitoring pin. Connect the power supply that you want to monitor to theappropriate enable and monitoring pins on this header. Then, move the corresponding jumpers (describedin the next section) so that the power supply rail is monitored using this header, instead of on the board.

CAUTION

Ensure that if you are configuring the UCD9080EVM 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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1.4 Jumpers

1.5 Test Points

2 System Overview

System Overview

The UCD9080 EVM operation can be configured with different jumpers, that include these functions:•Monitoring onboard or external power supply voltages•Generating enable signals for driving onboard or external power supplies•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 of all jumpers included on the UCD9080EVM.

Table 1. UCD9080 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 UCD9080 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 UCD9080 to fall below the configured undervoltagethreshold. If the UV threshold is zero, no undervoltage occurs.JP29 Enable8 shared with I

C address detection. Remove this jumper when communicating Jumper on pins 1-2.with the GUI.

The UCD9080EVM comes with a set of test points that can be used for evaluation. All eight power supplyrails have test points on the right side of the board for monitoring the power supply voltages and theUCD9080EVM supply voltage (3.3 V).

The system block diagram is shown in Figure 2 .

Figure 2. System Block Diagram

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3 GUI Overview

3.1 Installing the GUI

GUI Overview

The system consists of these components:•Host (PC)—a Windows PC – used to configure and monitor the UCD9080EVM. The GUI (explained inthe GUI section) runs on the host. For the GUI to execute properly, the host needs to have theWindows .NET v2.0 Framework installed.•USB-to-I

C adapter—UCD9080EVM 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—UCD9080EVM needs 5-V power source to drive. This power is used by the UCD9080(by regulating to 3.3 V), LEDs, as well as the onboard rails, if used.•External voltage rails—when configured properly, UCD9080EVM can sequence and monitor externalvoltage source as well.•UCD9080EVM—EVM board that houses the UCD9080 and peripheral circuits. The EVM can sequenceand monitor onboard as well as external voltage rails, as previously explained.

The UCD9080EVM 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 and that the Microsoftlibraries are up-to-date.1. Remove JP29 and ensure that the EVM is powered on by connecting the power source to the boardand then enabling the power source.2. Connect the ribbon cable from the USB Interface adapter to the EVM board connector.3. Connect the PC USB cable to the USB Interface Adapter.

Note: The UCD9080EVM 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.

4. 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

5. 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.6. Once you have installed the .NET Framework and the UCD9080EVM GUI, you can launch theapplication.

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3.2 UCD9080 GUI Main Window

System Status

STATUS register

Statistics

Communication

Statistics (GUI only)

Rail Status

RAILSTATUS

and RAIL registers

Update Parameters and Sequence

Updates device configuration

parameters and sequences

Detect I C address

0x60 - 0x6F

2Sequence

RESET register

Error Log

ERROR registers

GUI Overview

The GUI main window helps you monitor the EVM sequencer status and configure the EVM sequencerthrough the File and View menus.

Figure 3. GUI Main Window

The UCD9080 EVM main window GUI has these areas:•System Status—parameters including I2C Error, Rail Error, and Error Logs in Flash indication. Redbox fill indicates an error.•Error Log—contains error messages that inform the user about the operation of the sequencer.•Rail Status—information including monitored voltage (scaled to user-entered divider ratios) and railerror status.•Statistics—I2C communication statistics.•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 sequence.•Menu bar— selects File and View menu items

The File menu includes these commands:•Load Configuration—loads a previously saved parameter (*.par) file.•Save Configuration—saves the current GUI configuration to a user parameter file.•Save I2C Transactions—generates an ASCII text file containing configuration-specific I

Ctransactions (to be used by a master host to configure the UCD9080).•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—discover the slave (EVM as jumper-configured) I

C address (displayed at the bottom of theform).

•Exit—stop the GUI application

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3.2.1 I

C Addresses

3.3 GUI System Configuration Window

Shutdown Delays

GPO

Voltage Reference

Function Select

Store to Buffer

I2C Configuration

GUI Overview

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 genral-purpose outputs (GPOs)simultaneously open all GPO windows for setup comparisons.•User Data—provides specific user data to be uploaded to the device, such as customer specificidentification.

Users can change the detected I

C address on the EVM by modifying the state of jumpers JP17–JP20. Ifthe jumpers are changed during GUI operation, the user has to perform an I2C Discover command, aspreviously described.

The System Configuration window on the GUI is shown in Figure 4 and allows the following to beconfigured in the UCD9080:

Figure 4. 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 UCD9080 device data sheet (SLVS692 ).•Voltage Reference—selects the device voltage reference. The UCD9080EVM 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.

•Function Select—helps you select the EN8 or GPO1 function. The function selected disables theother function from being configured.

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3.4 GUI Rail Configuration Window

Max Time for Regulation

Ramp Time registers

Out of Regulation Time

Out Of Regulation Width

registers

UV Threshold

Under Voltage Thresholds

registers

Active Low (Rail Polarity)

Enable Polarity register

OV Threshold

Over Voltage Thresholds

registers

Sequencing Conditions

Sequence Event Parameters

registers (ENABLE bits)

Sequencing Conditions

Sequence Event Data registers

(RAILDATA bits)

Sequencing Conditions

Sequence Event Link registers

(PARENTRAIL bits)

Alarm Processing

Sequence Event Data

registers (SEQPARAM bits)

Rails/GPOs to shutdown

Dependency Masks

registers (RAIL & GPO bits)

Sequence after Shutdown

Sequence Event Link

registers (RESEQ bit)

Rail Configuration Window

Sequence Event Parameters

registers (RAIL/GPO bits)

Voltage Divider

Used by GUI to calculate scale

factor for displayed Rail

Voltage & internal UV/OV trip

Log Errors to Flash

Save Rail Log registers

3.4.1 General Rail Windows Selections

GUI Overview

•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 5 and permits you to configure theseUCD9080 items:

Figure 5. GUI Rail Configuration Window

•Active Low (Polarity)—specify enable pin polarity.•UV/OV Threshold—specify undervoltage and overvoltage trip points. Note that UV values of zeroessentially cause the device to ignore any undervoltage conditions and that OV values which areexcessively high cause the device to ignore any undervoltage conditions.•Out of Reg Time (ms)—specify the maximum amount of time (or glitch width) that the rail can be outof the UV/OV range before an alarm is declared.•Max Time for Regulation (ms)—specify the maximum amount of time a rail is allowed to achieveregulation (rail voltage must be within the UV/OV range) before an alarm is declared.•Log Errors to Flash—log rail errors to nonvolatile memory for later evaluation.•Voltage Divider—specify the user rail voltage divider values. The GUI uses these values to properlyscale and display the voltages received through the UCD9080 monitors. Note that zero value dividerresistor values cause the divider ratio to be evaluated as unity (no scaling).•Sequence after Shutdown—specify the UCD9080 ENx and GPOx output to be marked tore-sequence the system (as defined by the current sequencer configuration) if they are specified as adependency in the DependencyMasks register.

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3.4.2 Sequencing Conditions Selections

3.4.3 Alarm Actions

3.5 GUI GPO Configuration Window

GPO Configuration Window

Sequence Event Parameters

registers (RAIL/GPO bits)

Active Low (GPO Polarity)

Enable Polarity register

Sequence after Shutdown

Sequence Event Link

registers (RESEQ bit)

Sequencing Conditions

Sequence Event Parameters

registers (ENABLE bits)

Sequencing Conditions

Sequence Event Data registers

(RAILDATA bits)

Sequencing Conditions

Sequence Event Link registers

(PARENTRAIL bits)

3.5.1 General GPO Window Selections

GUI Overview

Voltage rail sequencing conditions are:•None—rail is not sequenced.•Time—number of milliseconds before this rail is enabled.•Parent (Reg)—number of milliseconds to delay after the parent rail achieves regulation beforeenabling this rail.•Parent (V)—voltage at which the parent rail should be before this rail is enabled

The alarm actions are:•Log Only—ignore any failures on this rail, and keep it enabled.•Retry—continue to retry a configurable number of times (n = 0,1,2,3,4), then shut down according tothe DependencyMasks and UnsequenceTime registers.•Retry Continuously—when an error on the selected rail happens, a retry occurs. A retry is an attemptby the UCD9080 to restart the corresponding power supply by disabling the rail (with ENx pin) andthen re-enabling the rail. This repeats until the power supply rail alarm clears.•Sequence—when there is an error on this rail, resequence the system according to the currentsequencer configuration.

The GPO Configuration windows displays in Figure 6 and provides for these UCD9080 configurationsettings:

Figure 6. GUI GPO Configuration Window

•Active Low (Polarity)—specifies GPO pin polarity•Sequence after Shutdown—UCD9080 ENx and GPOs output can be marked to re-sequence thesystem (as defined by the current sequencer configuration) if they are specified as a dependency inthe DependencyMasks register.

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3.5.2 Sequencing Conditions Selections

4 EVM Design Configuration Information

4.1 Voltage Rail Set Points

VRAILx +VREF ǒ1)RUP

RDNǓ; VREF +0.6663 typical for TPS76201

Set RDN +66.5 kW(max); RUp +ǒVRAILx

VREF *1Ǔ RDN

(1)

Set R5 +10 kW 0.891

VRAIL7 *0.891 *3.24 kW

(2)

Set R2 +10 kW 0.8

VRAIL8 *0.8 *2.49 kW

(3)

4.2 Rail Bleed-Down Considerations

EVM Design Configuration Information

Sequencing conditions for a GPO•None—GPO is not sequenced•Time—number of milliseconds before this GPO is enabled•Parent (Reg)—number of milliseconds to delay after the parent rail achieves regulation beforeenabling this GPO•Parent (V)—voltage at which the parent rail should be before this GPO is enabled

The EVM rail output voltage Set points are configurable by changing the output voltage set-point resistors.RAIL1, RAIL2, RAIL3, and RAIL4 are monitored directly by the UCD9080 (no feedback divider resistors)and these rail output voltages should 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 canbe higher than the currently used voltage reference.•RAIL1 through RAIL6: TPS76201 100-mA LDO

Note: R

has been set to 49.9 Ωon the EVM to more quickly discharge the rails during shutdown(see the rail bleed down considerations section).

•RAIL7: PTH04070 3A Switching Regulator

•RAIL8: PTH05050 6A Switching Regulator

When considering system shutdown (or unsequence time), loading on the power supply rails must betaken into account. The rail bleed-down times are a function of the loading and the total (load and powersupply) output capacitance. As previously noted for RAIL1-RAIL6, the output voltage set-point resistorshave been chosen to provide a much quicker bleed-down time than could be achieved with a light load.For RAIL7 and RAIL8, the feedback divider resistors have been sized to provide more loading for thesame reasons. If the user chooses to provide external rail loading, the output voltage set-point resistorvalues can be adjusted. The EVM rail bleed-down times using the values shown in the BOM are on theorder of <10 ms, whereas for no-load conditions the rail bleed-down times can approach several seconds.

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