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Troubleshooting TPS65217A evaluation board

John Ladasky
Prodigy 225 points
Other Parts Discussed in Thread: USB2ANY

I recently joined an R&D group which has a TPS65217A evaluation module (EVM).  Yesterday I tried to start it up for the first time.  No one has used it for close to two years.  I think it may be damaged, but no one who presently works here knows enough about it.  Please help me diagnose my problem.

First of all, I'm not using the software yet.  I have the USB Interface adapter connected to my computer and the EVM.  I have the documentation for the EVM and for the PMIC itself.  Page 2 of the EVM manual says: "The EVM will power-up and operate without use of software."  That's all I'm trying to do for now.  Pages 6 and 7 describe how to configure the jumpers.  My setup looks identical to Figure 3 (page 7) except for the fact that I do not have a battery connected.  Page 6 says that I should open JP6 if I don't have a battery, so that's what I did.

Figure 1 (page 17) of the TPS65217A data sheet shows the global state diagram.  If I am reading it correctly, PGOOD and LDO_PGOOD should both pull high when the ACTIVE state is reached.  I see that, I'm getting a steady +3.3V on both lines.  However, the white LED drivers should also turn on in ACTIVE state.  I'm not seeing any lights.  Also, I get no voltage across any of the PMIC output terminals.  Shouldn't at least LDO1 be on, and reading 1.0V?

Any advice is appreciated.  Thanks!

  • 0
    TI__Expert 3740 points
    John,

    Do you have the USB2Gpio or the Usb2any attached? The EVM needs an external 3.3V to drive the pwr_en pin. You can also use a regulated supply and attach directly to the 3p3 pin on the EVM.

    Janice
  • 0 in reply to Janice Escobar
    Prodigy 225 points

    Hi Janice,

    Thanks for your reply.  I am powering the EVM through J8, using the USB-to-GPIO box that came with the EVM -- the gray box with the ribbon cable that is shown in Figure 1 of the EVM documentation.  That part appears to be working, I have 3.3V on the 3P3 pin.  3P3 is jumpered to PWREN at JP9.

  • 0 in reply to John Ladasky
    Prodigy 225 points
    Following up to myself: I have just found a manual for the USB Interface Adapter itself. Apparently that little dimple next to the USB conceals a power LED. It's not lighting up, even though power is passing through the adapter all the way to the PMIC EVM. I tried a different USB cable, a different USB port on my computer, and a completely different computer, with no results. Something in the adapter is clearly broken. Oh well.
  • 0 in reply to John Ladasky
    TI__Expert 3740 points
    John,

    Try hooking a regulated external supply to the PWR_EN pin, to ensure it is not the EVM giving you issues.

    Janice
  • 0 in reply to Janice Escobar
    Prodigy 225 points

    Hello again Janice,

    Thanks for staying with me.  I tried attaching a 3.300V regulated power supply to the EVM in three different ways.  None of the test conditions caused the LED's to blink, or provided output on any rail.  I think that the board is broken after all, and the USB to GPIO connector might be fine.  Here is what I saw:

    1) If I open JP9 and connect the power supply directly to PWR_EN, PGOOD and LDO_PGOOD read zero.  This is what you recommended that I try.

    2) If I connect 3P3 to PWR_EN through JP9, and connect my power supply to 3P3 at J8, I see what I saw before: 3.3V on PGOOD and LDO_PGOOD.

    3) However, if I open JP9 and connect my power supply directly to 3P3, I still see 3.3V on PGOOD and LDO_PGOOD!  PWR_EN reads zero (as expected, because it is not jumpered to 3P3). Judging from the PMIC state diagram and the EVM schematic, I do not think that this should be possible. It suggests that a component may have shorted.  But that is just a guess on my part.

    Please let me know if you have any other suggestions.  Thanks.