It's a common challenge to measure voltages that exceed the operating voltage of the ADC used as part of the measurement circuit. One commonly employed method is to use a resistor string as a voltage divider, setting the resistor ratio such that the highest voltage of interest is scaled below the ADC’s reference voltage. It provides a fixed ratio, but small input voltages can’t take advantage of the dynamic range of the ADC. Also, unanticipated oversized signals may damage the
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