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TPS65400EVM not working out of the box

Mark Nohr
Intellectual 570 points

I followed all the steps. Connected the USB dongle to the board, powered up at 12V, TI software found the board and connected to the dongle. Power on all the outputs came up but was not the values on the GUI. 3.3, 2.5,1.8, 1.2

Have not applied a load to any of the outputs.

I tried adjusting the output voltage on the 3.3V with apply changes immediately selected. No change on the output according to my DMM. Did a soft reset and the output went unstable.

Closing the SW and re-opening the software brought the 3.3V back but still no control and soft reset makes it lose it's mind.

Tried setting the EEPROM value to default. Still no change in behavior.

Is there a validation procedure or video I can follow for the EVM itself?

  • 0
    Intellectual 570 points
    Further investigation revealed the output voltage adjustments were not working because the SW utility has the target voltage indication on each of the 4 tabs mixed up. I had measured 3.3V on Vout2 and my folly was finding that voltage indicated on the "Page 0X02 - SW3" tab and adjusting the vref on that tab adjusted the "Expected" output voltage (3.3V) up and down. However, monitoring the 3.3V with a DMM showed no change in the output voltage of the EVM board. I found that this adjustment was in fact adjusting the SW3 output (1.2V).
    This mixup is on all of the tabs.
    With this new knowledge I can adjust all of the outputs on the EVM with success.

    Using the soft reset feature on the "ALL" tab seems to function correctly the 1st time it is used but using it a second time results in the outputs going unstable. Cycling the "Operation" off and then on again seems to reset the chip and all the supplies come back up and seem to be stable. I'm not sure the cause of this phenomena.
  • 0
    TI__Intellectual 2590 points

    Hi Nohr,

    Maybe it's a connection issue. would you please connect the hadware and power on the device again?

    you can refer to the following EVM user guide to detail step.

    thanks!

  • 0 in reply to Mark Nohr
    TI__Intellectual 2590 points
    Hi Nohr,

    we have tested a lot result on our EVM, if you adjust the reference voltage at SW2 page, you should change the output voltage of Buck2. please check whether you have tested the output voltage of Buck2 and whether their has mistake here.
    thanks!
  • 0 in reply to Eric Guo1
    Intellectual 570 points

    Hi Eric,

    Please read my second post carefully. There is a bug in the PI-Commander-PMU tool. I'm sure you can see the problem if you have the EVB and are running the tool.

    The second issue involving the soft reset cannot be resolved by a power cycle.

    If you would like I can share my screen and a web camera to show you the issue. Send me an email and I can reply with a screen sharing invitation.

  • 0
    Intellectual 570 points
    Hi Eric,
    I received a second EVM from my TI rep (CJ). the Soft reset behavior is different. I'm going to open a separate issue for this as I have screenshots, videos and device config files to provide and I don't see a way to attach them in a reply.
  • 0 in reply to Mark Nohr
    Intellectual 570 points

    Is there now a more recent version of the PI-Commander interface (PI-Commander Version 0.8.5)?

    The fields reporting expected voltage still seem to be mapped to the wrong tabs.

  • 0 in reply to Mark Nohr
    TI__Intellectual 2590 points
    Hi Nohr,

    that is the latest version which we have, do you mean the Expecte voltage in SW is worning? please froget about this error in software, you can get the right on on EVM, just calclate the Vout using the FB votlage which software set.
    thanks!