Texas Instruments UCD9081 User Manual Download

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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

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Hardware Overview

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GUI Overview

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EVM Design Configuration Information

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EVM Schematic

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Bill of Materials

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Related Documentation From Texas Instruments

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List of Figures

System Block Diagram

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UCD9081EVM Functionality

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UCD9081EVM Hookup

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GUI Main Window

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GUI Help Window

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GUI System Configuration Window

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GUI Rail Configuration Window

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GUI GPO Configuration Window

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GUI User Data Window

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List of Tables

UCD9081 Jumpers

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C is a trademark of Philips Corporation.

SLVU249 – September 2008

UCD9081 Power Supply Sequencer and Monitor EVM

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Summary of Contents for UCD9081

Page 1: ...f Materials 16 7 Related Documentation From Texas Instruments 17 List of Figures 1 System Block Diagram 2 2 UCD9081EVM Functionality 3 3 UCD9081EVM Hookup 6 4 GUI Main Window 8 5 GUI Help Window 9 6 GUI System Configuration Window 10 7 GUI Rail Configuration Window 10 8 GUI GPO Configuration Window 12 9 GUI User Data Window 12 List of Tables 1 UCD9081 Jumpers 5 Windows is a trademark of Microsoft ...

Page 2: ...l 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 The UCD9081EVM allows evaluation of the UCD9081 Power Supply Sequencer and Monitor with Error Logging The UCD9081 is a high...

Page 3: ...er 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 Ra...

Page 4: ...ing 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 CAUTION Ensure that if you are configuring the UCD9081EVM to moni...

Page 5: ...ontrol 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 for jumper Removal of these jumpers removes input from the power supplies causing the no undervoltage fault output voltage being monit...

Page 6: ...minates You then observe D1 and D5 D11 illuminate indicating that the UCD9081 is operating 2 Next connect the USB interface adapter to the UCD9081EVM J3 connector using the ribbon cable provided 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 devic...

Page 7: ...e application No other drivers or libraries are required to run the application 1 To determine the NET Framework software version you must use the Windows Control Panel and select Add Remove Programs The Control Panel lists all the installed PC software and you can determine if the proper Microsoft NET Framework version is installed Note To update your NET Framework to version 2 0 go this URL http...

Page 8: ... I2C Write I2C Read I2C NACK Rail Status information including monitored voltage scaled to user entered divider ratios and rail error status Update Parameters and Sequence button Updates buffer stored GUI information to device user flash memory and initiates a device sequence This process takes a couple seconds and then the sequencer is able to be monitored again Sequence button causes the system ...

Page 9: ... system voltage reference and shutdown delay field entries Rail Configuration provides rail configuration field entries All Rails simultaneously opens all rail forms 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 devi...

Page 10: ...ltage 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 are incorrectly scaled until the device parameters are updated Pin Function Select helps you select the EN8 or GPO1 function The function selected disables the other function from being configured Sequence Control Checking the Igno...

Page 11: ...te that zero value divider resistor values cause the divider ratio to be evaluated as unity no scaling Store to Buffer and Close Buttons The Store to Buffer button saves the current window entries to a GUI buffer and the Close button closes the window without saving the form entries Voltage rail sequencing conditions are None rail is not sequenced Time number of milliseconds before this rail is en...

Page 12: ...Store to Buffer and Close Buttons The Store to Buffer button saves the current window entries to a GUI buffer and the Close button closes the window without saving the form entries 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 before enabling this ...

Page 13: ...onsidering system shutdown or unsequence time loading on the power supply rails must be taken into account The rail bleed down times are a function of the loading and the total load and power supply output capacitance As previously noted for RAIL1 RAIL6 the output voltage set point resistors have been chosen to provide a much quicker bleed down time than could be achieved with a light load For RAI...

Page 14: ...d the enable is active low then a pulldown resistor must be located on the corresponding ENx output Note that on the EVM the ENx and GPOx outputs have selectable pullup or pulldown jumpers installed Also note that for the ENx outputs the ENx status LEDs provide a stronger pullup current than the jumper pulldowns so that the power supplies become disabled during reset Device reset occurs when Power...

Page 15: ...5 EVM Schematic www ti com EVM Schematic SLVU249 September 2008 UCD9081 Power Supply Sequencer and Monitor EVM 15 Submit Documentation Feedback ...

Page 16: ...ip 0 100 inch 3 PTC36SAAN Sullins 9 JP21 JP29 Header 2 pin 100 mil spacing 36 pin strip 0 100 inch 2 PTC36SAAN Sullins 2 Q1 Q2 MOSFET Nch 50V 0 22A 3 5 Ω SOT23 BSS138 Fairchild 8 R1 R4 R6 R15 300 Resistor Chip 1 16W 5 0603 Std Std R25 R32 R37 R45 10 R13 R17 49 9 Resistor Chip 1 10W 1 0603 Std Std R18 R21 R27 R36 R39 R47 1 R16 115 Resistor Chip 1 10W 1 0603 Std Std 1 R2 1 50k Resistor Chip 1 16W 1 ...

Page 17: ...TI 29 Shunt 100 mil Black 0 1 929950 00 3M 1 PCB 5 3 In 4 2 In 0 062 Inch HPA199 Any 4 Bumpons 2566 SPC USB Interface Adapter User s Guide SLLU093 8 Channel Power Supply Sequencer and Monitor With Error Logging data sheet SLVS813 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 ...

Page 18: ...roduct This notice contains important safety information about temperatures and voltages For additional information on TI s environmental and or safety programs please contact the TI application engineer or visit www ti com esh No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine process or combination in which such TI products...

Page 19: ...usiness practice TI is not responsible or liable for any such statements TI products are not authorized for use in safety critical applications such as life support where a failure of the TI product would reasonably be expected to cause severe personal injury or death unless officers of the parties have executed an agreement specifically governing such use Buyers represent that they have all neces...

Page 20: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments UCD9081EVM ...

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