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PMBus
Related Posts

  • Forum Post: Re: UCD9240EVM

    Changling WU
    Dear Nancy, Can you share the EVM schematic with me? We have design a intelligence power module with ucd9240, i find the PMbus work is abnormal (unable to detect the unique address .note:we are not use the standard TI USB to PMBus adapter,PMBus master is design by ourself).So I want to consult the...
    on Jun 24, 2009

  • Forum Post: Re: UCD9240/UCD9248 I2C problems

    Guenter Roeck
    Hi, thanks a lot for the hints. Oddly enough, I don't even have anything connected to the power rails at this time. Plus, I see exactly the same problem with a UCD90124EVM, so the problem doesn't seem to be caused by my prototype setup. The I2C line already has a small resistor in...
    on Feb 2, 2011

  • Forum Post: Re: UCD9240/UCD9248 I2C problems

    Mark Hagen
    Guenter, I think you may be fighting two issues here. 1.7V on the 1.9V core voltage is definitely not a good sign. As Edgar points out, the UCD92xx devices have proved to be sensitive to the connection to decoupling on the 3.3V and 1.9V (BPcap) pins and ground pins. Ideally, there should be no vias between...
    on Feb 2, 2011

  • Forum Post: Re: UCD9240/UCD9248 I2C problems

    Guenter Roeck
    Mark, I agree. On the I2C side, I think I know what the problem is. I noticed that for ACKs sent from the TI chip, the setup time from SDA low to SCL high is sometimes very low, in the range of 250 ns. This doesn't happen all the time - most of the time the setup time is around 4-5 uS. It is...
    on Feb 3, 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: UCD9240/UCD9248 I2C problems

    Guenter Roeck
    I was able to capture data from an oscilloscope as a .CSV file. Same location as above, file names TSO00001.CSV and TSO00001.xls. The .xls file includes two charts with the failing access. Signal looks clean enough to me, only if I interpret the data correctly, data setup time (data low to clock high...
    on Feb 11, 2011

  • Forum Post: Re: UCD9240/UCD9248 I2C problems

    Guenter Roeck
    Mark, sounds good.If you need better data from the scope, please let me know and I'll try. I am still learning how to use it. I am in touch with the vendor of the I2C master adapter; they ordered some of the affected chips to try themselves. I also ordered another I2C adapter to see if it makes...
    on Feb 14, 2011

  • Forum Post: Re: UCD9240/UCD9248 I2C problems

    Guenter Roeck
    I2C adapter side pullup is 2.2k. I also tried various pull-up resistor values on the chip side, as well as pull-ups on both ends. I also tried with and without series resistors on the chip side. Unfortunately, that does not make a difference. Behavior and waveform is always the same. Once in a while...
    on Feb 15, 2011

  • Forum Post: Re: Making own Command in PMBus

    Mark Hagen
    The PMBus standard, which details each of the PMBus commands can be found here . The TI UCD92xx devices implement many, but not all, of these commands. The list of commands implemented in the UCD92xx controllers is defined in the UCD92xx PMBus Command Reference . This reference also lists commands specific...
    on Feb 17, 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: UCD9222

    Lee Lemay
    I'm interested in using the UCD9222 to control power for a TMS320C6678. In my application, pins on the connectors are very precious, and I would like to avoid using them for the UCD9222 PMBus if I can avoid it. Do I have to be able to program the UCD9222 over the PMBUS in order to use it to power...
    on Aug 8, 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: 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: How can I connect computer to PMbus interface?

    guoping Lee
    I am interesting in using UCD9222+UCD7242 to control power for TMS320C6678. As the datasheet said,UCD9222 can be configured through PMbus.how can i connect ucd9222 PMbus interface to my computer.Where can i bought the connecting line.Does someone can give me a link? does the PMbus interface like this...
    on Mar 7, 2012

  • Forum Post: Labview use USB-TO-GPIO for PMBus issue

    Yang Meng-Chu
    (Please visit the site to view this file) Dear all, I want to use Labview to Control USB-TO-GPIO for PMBus protocol please see fig1. but when I use function of BlockRead and writeBlock I get fail message please fig2. Have any can help it issue, about source code please see attached? thanks a lot...
    on Mar 9, 2012

  • Forum Post: UCD9224EVM I2C and PMbus questions.

    ������ ���92405
    Dear all, I am beginner to the UCD9224.And I bought UCD9224 EVM board and USB adapter.Now I am trying not to use the USB adapter.Instaead,I use the microchip PIC18F4320 to control the UCD9224 EVM board. I think the pmbus commands are similar to I2C commands. So I connect the CLK and Data pins of microchip...
    on Dec 28, 2011

  • Forum Post: Smart Fusion Log, UCD9222, READ_TEMPERATURE_2_1

    Courtney Cooley
    Hello, I have a design which utilizes the UCD9222 to control two seperate power drivers. I have both of the Temp pins of the controller connected to the Tmon output pins of the drivers. I recently ran some tests with the GPIO-to-USB adapter connected to the PMBus header on my board and recorded the...
    on Apr 4, 2012

  • Forum Post: PMBUS COMMAND

    guoping Lee
    Hi everone .the UCD9222 datasheet said the output voltage margining is configured by VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW commands. The OPERATION command seleces between the nominal output voltage and either of the margin voltages. what voltage margining means?what dose VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW...
    on Apr 18, 2012

  • Forum Post: PMBus Logging in Smart Fusion Software

    Courtney Cooley
    Hello, Is there a way to control what commands are logged in the PMBus log? I have been playing around with the tool, and I can't figure out a way to edit what is logged. I am talking about the text file logs that are generated by going to "Tools" > "PMBus Logging...", in...
    on Apr 5, 2012

  • Forum Post: ml605-ucd9240 read_vout and temperature

    h��seyin a��asar
    hi TI users, I recently work on read out voltage and current from UCD9240 on Ml-605 FPGA board with an arm mcu. my problem is when i read output voltage value(2 byte) and convert with linear16 format i have 5v, but i know that only 1V over there. and when i temperature i calc wrong value. readtempvalue...
    on Sep 24, 2012

  • Forum Post: UCD9240EVM

    Jon Woodhead
    Hi, I recently attended one of Texas' Power Supply Design Seminars and was interested by the digital control topic and particularly the options made available with PMBus and Fusion Desginer. The videos for the UCD9240 mention a development module but i can't find any information on ordering...
    on May 21, 2009

  • Forum Post: RE: UCD3138LLCEVM-028 registration

    peter lo
    I had same isseue. Asner electronic(Ted Hung) is a Taiwan company & just placed order to by UCD3138_PFC_026 & LLC_028 EVM_Kits. I am a chief firmware& app engineer , knew details about LLC&PMBUS C++ applications. How could get both frimware code? Regards, Peter Lo
    on Jan 10, 2013

  • Forum Post: PMBUS communication problem UCD9125

    Hajdu J���zsef
    Dear Sir / Madam I use one made ​​by Ericsson dc -dc converter which chip is a ucd9125. problem: I2C commands send to the chips trigger a NACK response. This happens I2C read and write commands. I tried changing the I2C frequency;100khz and between 10 khz.,the problem is not solved. Push pull resistor...
    on Dec 10, 2012

  • Forum Post: SMBus and PMBus interoperability

    Jmax604
    I am wondering about the interoperability of putting an SMBus/I2C part on a PMBus. With some limited investigation I am able to determine that PMBus is based on I2C/SMBus which leads me to believe that these are in fact compatible. More specifically we are controlling UCD9090 via PMBus and would...
    on Feb 5, 2013

  • Forum Post: UCD9240 PMBUS problem - lost link

    LouisLee2012
    Hi, I have been developing an ADC board based on the design of Xilinx ML605 demo board. The power supply circuit is also nearly the same as ML605 using 2 UCD9240 with 5 PTD08A020W and 2 PTD08A015W. I have made 3 prototype units. I found that the PMBUS of UCD9240 of the last prototype board lost link...
    on Feb 27, 2013
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