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TPS65217: configure TPS65217A from Sitara bootloader

Jan Bock
Expert 3045 points
Part Number: TPS65217

Hello Emily

My customer want to use TPS65217A  for TPS65217D to improve supply chain. 

Now he asks if it is possible to use SPL bootloader to reconfigure TPS65217A  for DDR3L RAM usage. The RAM is from start of the boot process. So can read the Version of TPS65217x via I2C and then reconfigure it in the SPL boot (in second step below)?

  1. ROM loads U-Boot SPL
  2. U-Boot SPL initializes clocks (including MPU), RAM and some other stuff (like UART for console)
  3. SPL loads U-Boot proper
  4. U-Boot proper loads your OS or does whatever

Thanks for help!

Jan 

  • 0
    TI__Genius 12735 points

    Hi Jan,

    I do not think this would work if they are planning on leaving the device disabled then trying to change the power up voltages and sequencing. My understanding is that the startup sequence cannot be modified by I2C and thus the customer will have to power up the device following the default sequencing and voltages and then disable the rails. After they disable the rails they could then change the output voltage settings then power the rails back up.

    Do they need LDO3 and LDO4 to be LDOs or can they be load switches? This will be the other issue when using the A device over the D.

    My best suggestion would be to use TPS65217C as it matches the proper power up sequence and voltages outside of DCDC1.

    Best regards,

    Layne J

  • 0 in reply to Layne J
    TI__Expert 3045 points

    Hi Layne,

    My customer answered via Email:

    Why the question is coming up because of the ability of the components specifically -D on the market. -A is right now available, but I’m not sure about -C.

    We use all LDO’s. But could you please explain a bit more what do you mean LDO or switches?

    Thanks 

    Jan

  • 0 in reply to Jan Bock
    TI__Genius 12735 points

    Hi Jan,

    TPS65217A is configured to have LDO3 and LDO4 output as load switches rather than output as LDOs, so if they are using those LDOs then they will likely not be able to utilize this device version. The -B, -C, and -D versions of the device all have these LDOs configured to operate as LDOs, however the current limit on the -B device for LDO3 and LDO4 is only 200mA instead of the 400mA seen on the -C and -D versions of the device. This is why I suggest looking at TPS65217C if they must make a change for supply concerns.

    All of the information above can be seen in the Device Comparison Table in the TPS65217 datasheet.

    Best regards,

    Layne J