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UCD92xx
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  • Forum Post: UCD92xx configuration, JTAG vs. other methods, VHDL usage, access to internal registers

    Juergen Schneider
    Hello, Could you please help with a recommendation for the correct design flow for configuring a UCD92xx? Are there dedicated internal registers which needs to be configured? Where can I find information about this topic? Is there a way to use VHDL for that purpose? What’s the difference...
    on Dec 1, 2010

  • Forum Post: Re: UCD92xx configuration, JTAG vs. other methods, VHDL usage, access to internal registers

    Brad
    Options for storing the UCD92xx configuration file to the data flash memory can be found in the attached document, Configuration Programming of UCD Devices. This document can also be accessed through the Fusion Digital Power Designer Software under Help --> Documentation & Help Center Configuration...
    on Dec 16, 2010

  • Forum Post: Re: UCD9240 out of calibration

    Mark Hagen
    All, We have found that the V33A power pin on the UCD92xx parts needs good, low ESR decoupling to ensure an accurate internal clock and reference. This has been born out by Edgar's application, where he is using the 80-pin UCD9248 and by other customers using the 64-pin and 48-pin versions of the...
    on Jan 6, 2011

  • Forum Post: Re: Minimum rail risetime on UCD9240 (TON_RISE)

    Mark Hagen
    Edgar, The max slew rate during the soft start and soft stop ramps are based on the following table. AFE gain dynamic range max step/100 usec slew rate 1X ±256 192 mV 1920 mV/ms 2X ±128...
    on Jan 6, 2011

  • Forum Post: Re: UCD9240/UCD9248 I2C problems

    Guenter Roeck
    Mark, yes, I understand that clock stretching is used, and I can see it on the logic analyzer. Problem is that the setup time from data low to clock high is sometimes very low, about 250-300 nS. If that happens, my i2c test adapter interprets the result as NACK. I'll try to create some screenshots...
    on Feb 3, 2011

  • Forum Post: Re: UCD9246 Pull up needed?

    Brad
    There is a very weak internal pull-up that will allow the pin to float high without anything connected to the pin. An external pull-up should be used to guarantee functionality.
    on May 4, 2011

  • Forum Post: Command sequence to adjust rail voltage on UCD92xx

    Ken Chapman
    Using my own embedded design I am generally able to communicate on the PMBus with the UCD9240 and UCD9248 controllers and have successfully used many of the commands including VOUT_COMMAND to adjust the output voltage of a rail. I recently had the requirement to be able to set a rail to 1.8v, 2...
    on Jun 17, 2011

  • Forum Post: Re: FIT failure data for UCD7242RSJT, UCD9224RGZT

    Bryan Busacco
    Leonard, I see FIT data for the UCD7242RSJR as you pointed out, thanks. There is no FIT data for the UCD9224RGZT. How can we get this information? Thank you, Bryan BUsacco
    on Aug 1, 2011

  • Forum Post: FIT failure data for UCD7242RSJT, UCD9224RGZT

    Bryan Busacco
    Can TI provide FIT ( Failure in Time ) data for the UCD7242RSJT and the UCD9224RGZT? Thanks, Bryan Busacco
    on Jul 29, 2011

  • Forum Post: Re: UCD9222

    Brad
    All the UCD92xx controllers are provided from the factory in a default un-configured state, so that they can be assembled to a board without the risk of powering up prior to the loading of their final configuration. There are a number of ways to configure a UCD92xx controller, these are the most popular...
    on Aug 9, 2011

  • Forum Post: Re: Setting Driver Configuration Commands

    Brad
    The Fusion Digital Power Designer GUI sets the configuration parameters listed above based on other user selections, Driver selection, Rated Current, etc. The GUI provides basic descriptions of the commands in the Tips & Hints box when the command is rolled over by the mouse, however some of the...
    on Aug 17, 2011

  • Forum Post: Re: Calculating Vout Max

    Brad
    The Vout_Max configuration parameter is set 18% above the Nominal Output Voltage setting on the Design page of the GUI for output voltages of 1.356V and above (1.356V *1.18 = 1.6V). The value of Vout_Max will be set to 1.6V for all values of Nominal Output Voltage below 1.356V. This is just a starting...
    on Aug 17, 2011

  • Forum Post: Re: Setting PMBus address in Power Designer

    Brad
    Currently, the Fusion GUI automatically assigns an "address" to the project file (.xml) when working in the offline mode, a virtual address, this allows the GUI to function in the same manner when operating offline as it does when online when it would read the physical address of the controller...
    on Aug 18, 2011

  • Forum Post: Re: Unused inputs

    Brad
    Pins (DPWM, EA_P/_N, CS, FLT, SRE, VID) that are associated with unconfigured rails or phases can be left floating. The temperature was expected to be used always and the input will be monitored whether the function is used or not, you may want to tie the TEMP input to ground through a resistor if unused...
    on Aug 23, 2011

  • Forum Post: Re: Can I read configuration files out of a UCD9240?

    Brad
    When connecting to a live board with the Fusion Digital Power Designer, the configured parameters are downloaded from the device into the GUI interface which can then be saved to a project file. This project file could be used at a later date to restore the configuration to the original shipped settings...
    on Aug 25, 2011

  • Forum Post: UCD9240 Errata applicable to UCD9246? Esp WRT supported PMBUS addresses?

    Stuart Currie
    I just noticed the UCD9240 errata listed under the datasheet on UCD9246 home page. http://www.ti.com/lit/er/sluz022/sluz022.pdf Is it applicable to the UCD9246? We have designed with unsupported addresses per errata#2. Stu
    on Nov 15, 2011

  • Forum Post: Re: UCD9222 configuration

    Brad
    The factory's default configuration supplied on all the UCD92xx devices allows power to be applied to the controller without enabling any voltages to be generated from the output rails. This allows the controller to be loaded with its configuration after it has been installed on the customer's...
    on Nov 21, 2011

  • Forum Post: Re: UCD9224 GPIO sequencing

    Brad
    No, all UCD92xx GPIO output responses are based off of internal trigger mechanisms within the controller as defined on the GPIO Config tab of the Fusion GUI. They cannot use a UCD92xx controller with one GPIO configured as an input to generate a GPIO output signal on another pin.
    on Dec 15, 2011

  • Forum Post: Version 1.8.157 of Fusion Digital Power Designer is now available for download on ti.com

    Michael Muegel
    Version 1.8.157 of Fusion Digital Power Designer is now available for download on ti.com: http://www.ti.com/fusion-gui This replaces version 1.8.140. There are improvements and bug fixes for UCD92xx, UCD90xxx, TPS, and Isolated devices. Highlights of key changes since 1.8.140 are described below...
    on Jan 4, 2012

  • Forum Post: UCD9222 PowerGood problem

    Krister Lindstrom
    Hi all. We have built a board with UCD9222 / UCD7242 generating the Flex supply for two C6878 DSPs. The UCD9222 is still unprogrammed. The UCD9222 PowerGood signal is used to sequence the rest of the DSP power supplies. The PowerGood signal is pulled up with 10k to +2.5V since it is an open...
    on Dec 6, 2011

  • Forum Post: Sequencing the UCD9222

    JacobV1587
    I want to control the UCD9222 by the EN1/EN2 pins. I set the On/Off config to 0X16 (CONTROL pin only), but the converter is always off. Only when I set the On/Off confit to 0x2 (Always converting) the converter works fine. But now I don't have sequencing. What do I wrong? Thanks in advance, ...
    on Jul 4, 2011

  • Forum Post: Connection of UCD92xx PMBus to PC Mainboard SMbus via PCIexpress possible?

    Bernhard Greissing
    When using one (or two) of the UCD92xx Digital Power Controllers (e.g. the UCD9246) for the power supply on a PCIexpress card is it then possible to connect the PMBus of those controllers to the SMBus-Interface which is available on the PCIexpress slot? This would make it possible to independently monitor...
    on Feb 28, 2012

  • Forum Post: UCD9224 and low frequency 3K-20K

    ������ ���92405
    Dear all I am wondering if there are any method that can make ucd9224 operating at 3K to 20Hz switching freqency and do not affect the duty cycle. I insert a square wave (below 16K Hz) to the SYNC pin of UCD9224. But the output PWM signal seem a little bit strange. Please advise me how to generate...
    on Apr 6, 2012

  • Forum Post: UCD9224 low switching frequency

    ������ ���92405
    Dear Ti, I can use UCD9224 to generate 16Khz PWM signal, if I want to generate a lower switching frequency PWM signal. For example,3 to 20K Hz. I input a 10KHz square wave to the SYNC pin of UCD9224,but the PWM signal become a little bit strange. Please advise me how to generate a lower switching...
    on Apr 6, 2012

  • Forum Post: Re: PMBUS COMMAND

    Brad
    Voltage margining is typically used by vendors during their product testing, i.e. 4-corner testing, where they purposely run the system at the outer limits of ambient temperature and operating voltage. The UCD92xx controllers provide convenient set points, Margin_High and Margin_Low, for implementing...
    on Apr 19, 2012
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