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Original question:

MSP-FET: Bug or feature: VCC_TOOL is switched off if VCC_TARGET is supplied.

MSP-FET: Difference between MSP-FET430UIF and MSP-FET

RAJA BALAJI KARTHIKEYAN57
Prodigy 140 points
Part Number: MSP-FET

MSP-FET intentionally cut off VCC_TOOL when it sees some VCC_TARGET because it thinks the target has its own power.

Doesn't the same happen with  MSP-FET430UIF as well ?

  • 0
    TI__Mastermind 49692 points

    Hello,

    RAJA BALAJI KARTHIKEYAN57 said:
    MSP-FET intentionally cut off VCC_TOOL when it sees some VCC_TARGET because it thinks the target has its own power.

    Yes, that's correct. As Jace mentions in the thread linked above, this functionality makes sure the voltage logic levels match the targets when powered by the MSP-FET or an external power supply.

    RAJA BALAJI KARTHIKEYAN57 said:
    Doesn't the same happen with  MSP-FET430UIF as well ?

    It may, but I guess I'm wondering why this would be an issue. As discussed, this functionality ensures that the logic levels match between the debugger and target. When you use either debugger, you should only use either VCC_TOOL or VCC_TARGET.

    Regards,

    James

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