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TPS386000: Desgin Analysis

Shifali N
Expert 2145 points
Part Number: TPS386000

Hi Team,

I am using TPS386000 in my design for voltage monitoring. Can we leave  WDI# , WDO#, VREF and MR# pins floating if we dont want to use them in design.

Also can we connect all reset pins and consider single reset output like Figure in Page1

  • 0
    TI__Genius 9670 points

    Hi Shifali,

    The MR# pin requires a pullup resistor. If WDI#, WDO#, and VREF are not used they can be floating.

    All of the reset pins can be connected together with a pullup resistor like the figure in page 1.

    Best,

    Walter

  • 0 in reply to Walter Zollinger
    Expert 2145 points

    Hi Walter,

    Im just double confirming whether WDI# and WDO pins can be left floating. Since WDO# is connected to REST1 can we leave them floating.

    Also, what should be the pullup resistor value that should be connected to Reset pin.

  • 0 in reply to Shifali N
    TI__Mastermind 28090 points

    Hi Shifali,

    The WDIn and WDO pins can be left floating. In that case, WDOn will assert low (due to no logic transitions from WDI) but the RESETxn pins will not. WDOn is connected to SVS-1 in the sense that a reset of RESET1n needs to be reasserted in order to clear a low-asserted WDOn. I recommend reading Section 8.3.3 in the TPS386000 datasheet for a better understanding of the relationship between WDOn and RESET1n. Additionally, this application note provides a sample schematic in which WDI and WDOn are left floating.
    The pullup resistor should be 100kΩ (min 6.5kΩ max 10MΩ), as seen in Section 6.3 Recommended Operating Conditions.

    Thanks,

    Patrick