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TPS650864: TPS6508640 GPIO Sequence for ZU6

Satoshi Yone
Expert 3600 points
Part Number: TPS650864
Other Parts Discussed in Thread: TPS650861, BOOSTXL-TPS650861

Hi, Team,

My customer is designing TPS6508640 with ZU6. The customer plans not to use BUCK2、BUCK3、SWB1/2.

For the datasheet, GPIO1 is related with BUCK2. Is there any concerns not to use BUCK2 for ZU6? Please let me know if you have any suggestions.

Best Regards,
Satoshi Yone

  • 0
    TI__Genius 9380 points

    Satoshi Yone,

      I have forwarded your question to our product specialist. You should hear back from someone soon.

  • 0
    TI__Genius 17380 points

    Hi Yone-san,

    For the TPS6508640, the external components (FETs, inductors, capacitors) are needed for BUCK2 and BUCK3, otherwise the device will detect a power fault and perform an emergency shutdown. It might be possible to prevent the detection of a power fault by connecting an appropriate voltage to the feedback pin (i.e. a resistor divider), but I have not tried it. I would recommend targeting 2% above the set voltage to prevent switching without triggering overvoltage power fault.

    One alternative is to use the TPS650861 and for them to program it to their requirements. The TPS650861 is the same device as the TPS650864 but with the option to program the default settings. They could start with the TPS65086100 OTP Generator for Xilinx Zynq Ultrscale+ (TPS6508640 settings) and set BUCK2 and BUCK3 to be disabled. 

    Parts can be programmed in the BOOSTXL-TPS650861 board, on their board directly using I2C, or ordered pre-programmed from Avnet or Arrow (send the completed Excel file).