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TPS6591133 VBACKUP

Tom Saluzzo
Expert 1280 points

Originally using TPS659113. Now see it is NRND and recommend using TPS6591133. What is different between these two parts and why did TI recommend the change?

On TPS6591133 – pin D7 VBACKUP – what do you do with this pin if you are not using the function?

SWCU083 page 3 says connect it to VCC7 if not used.

Customer design currently has a 2K resistor to GND on VBACKUP pin and they want to change to 1.7K resistor to GND for part commonality. Is this OK?

  • 0
    TI__Expert 3305 points

    Hi Tom,

    Bumping this up and copying the right folks.

  • 0
    TI__Genius 16870 points

    Hi Tom,

    There was an issue with leakages in Da-vinci processor and in-order to eliminate the leakage a solution was found to simply swap the GPIO0 and GPIO7 for TPS659113 and TPS6591133.

    Please see section 3.1 of the Centaurus User Guide: swcu126a.pdf

    To observe the resulting sequence differences please see section 3 of the above user guide compared to the prior user guide for the TPS659113: swcu083a.pdf

    Please follow the user guide's recommendations and connect the VBACKUP pin to VCC7 if unused. Why does the customer have a 2k resistor on the BACKUP pin?