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It was a GPIO on older models, looking at the chip, it says minimum operational value of 1.7V. So, using it as a GPIO (assumedly with ground being low) might cause damage to the chip. I never tried that.

I am updating a system from a MOD5234 to a MODM7AE70. These boards plug into a motherboard in a larger system, all of the pins are backwards compatible (most are just GPIO) except one. Pin P2:5 is a GPIO on the MOD5234 and used as ADC VREF on the MODM7AE70. In our design this is used for a selector ...