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TM4C1294NCPDT: Is product quality assured when some siganls are applied from external device to TM4C129 while the power of TM4C129 is off?

Tsurumoto
Genius 15234 points
Part Number: TM4C1294NCPDT

Hi

Is product quality assured when some siganls (e.g. CCS, UART, GPIO, reset) are applied from external device to TM4C129 while the power of TM4C129 is off?

Thanks and Best regards,

HaTa.

  • 0
    TI__Guru**** 190616 points

    Hi,

      Yes, there could be irreversible damage to the device if the I/Os are powered while the device is un-powered. Please refer to the datasheet for details. There are several notes that talk about this. Below is one excerpt in the electrical section.

  • 0 in reply to Charles Tsai
    Guru 117855 points

    Holiday Survival Greetings, Charles,

    Staff/I greatly 'second' your advice - while it IS convenient to create such a 'staggered power' system - our long experience (>20 years) finds that 'Issue Frequency' rises - under such conditions.   (and the failures may be gradual & incremental - building w/the passage of time...)

    An 'eased method' of preventing such 'Staggered Power' issues is by 'Powering all interconnected boards/sources from the same (adequate) power supply!'    (or by 'Enabling & Disabling' individual, "Board-Level Supplies" via a common signal - insuring that the unpowered MCU is free from unwanted (and also patently unproductive) voltage arrivals...)

  • 0 in reply to cb1_mobile
    TI__Guru**** 190616 points

    Hi cb1,

      Thank you for your advice to the poster.