Processing unit input stage, has biased input and two comparators for comparing input voltage to two threshold voltages, in order to supply to processing circuit two bits representative of type of sensor connected to the input

摘要

The input stage has an input (A1) biased, e.g., by a resistive divider to a predefined bias voltage. The divider comprises two resistances of the same value connected in series between a voltage supply and earth. The input stage also includes two comparators (4a, 4b) that compare the input voltage to two threshold voltages (S1, S2), respectively higher than and lower than the bias voltage, in order to supply to a processing circuit (3) two bits representative of the type of sensor or automaton connected to the input.