| 摘要 |
PURPOSE:To effect price reduction and simplification of circuit construction, by making the number of precision resistances connected with sensors for constructing a voltage dividing circuit only one, regardless of the number of the sensors. CONSTITUTION:Voltages Vref, V1-Vn of each connecting point A, A1-An of a voltage dividing circuit are applied in due order to an A/D convertor 2 through a multiplexer 1 and converted to corresponding digital signals by the convertor 2 and then, delivered to input CPU3. The CPU3 makes calculations basing on signals delivered in due order from the A/D convertor 2 and voltages on both ends of each sensor S1-Sn are calculated. Thus, as detection accuracy of each sensor S1-Sn is determined only by a single precision reference resistance RST, reduction of price can be available. |
