Hi Dennis Had to forward you question the hardware designers, here is what they told me: We have a Zener in series with our supply and input to 3v3 ldo. So far the in house thinking has been because the supply to the MSP430 drops when we go below 14V the MSP430 internal 1.5 V ref will drop and the ADC will see a bigger gap between the ref and the incoming signal, hence we would get bigger readings from the ADC.
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