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CC3200MOD: CC3200MOD Setting PIN48 &50 between GPIO and ADC function

erik lee2
Genius 3060 points

Part Number: CC3200MOD
Other Parts Discussed in Thread: CC3200,

hi,

if my design may switch some PINs between GPIO and ADC function, and my ADC reference voltage is setting as 1.5V, but when my FW assign this PIN as ADC function but input voltage level is 3.3V, will it damange the ADC module of CC3200?

  • 0
    TI__Mastermind 25955 points
    Hi Erik,

    Do not feed 3.3 V into the ADC.

    The maximum voltage to the ADC is 1.46 V full scale (1.8 V absolute). The ADC inputs are tolerant up to 1.8 V versus the 3.6 V tolerance of the digital pads.

    To switch between the GPIO and ADC: take care to prevent accidental damage to the ADC inputs by first disabling the output buffers of the digital I/Os corresponding to the desired ADC channel, e.g., convert to a Hi-Z state, and THEN the respective pass switches should be enabled, e.g., S7, S8, S9. S10.

    For more information on the drive strength and reset states for the analog and digital multiplexed pins, please refer to section 3.5 of the CC3200MOD datasheet found at http://ti.com/lit/swrs166

    Sincerely,
    Bryan Kahler
  • 0 in reply to Bryan Kahler
    TI__Mastermind 25955 points
    Hi Erik,

    I'm going to close this thread due to the time elapsed since last response. If you have any more questions related to this inquiry, please create a new post and reference this thread.

    Thanks!

    Sincerely,
    Bryan Kahler