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TPS7B63-Q1: Device behavior when FSEL or WRS becomes open

Takahiro Saito
Expert 5315 points
Part Number: TPS7B63-Q1

Hi team,

My customer is considering to use the TPS7B6350-Q1.

How does the TPS7B6350-Q1 operate when FSEL or WRS pin becomes open? The customer is pulling FSEL pin up and pulling WRS pin down in their circuit. They concerned about what will happen if the pull up / down resistor is accidently OPEN.

Regards,

Saito

  • +1
    TI__Genius 12511 points

    Hi Saito-san,

    If they are using the watchdog in standard operation the WRS pin is not crucial to it's function, and therefore would not affect the timings of the watchdog functionality.

    Floating the FSEL pin will create an indeterminant frequency for the watchdog signal, which will cause problems, as the wd service signal will no longer line up and faults will be detected.

    If they are using window mode, Similarly, floating WRS will create indeterminant behavior this time tied directly to the fault detection circuitry. This means that once again it can cause faults to occur, although in this case, they have pulled it down meaning the closed window is already as selective as it will get, and so therefore there is a likelihood that no faults would occur as long as the WD pin is serviced in the timing window required for pull down. However, this will mean that watchdog faults may not occur when they should have occurred, which is a problem in the opposite direction.

    Regards,

    John