| 摘要 |
<p>Temperature sensing method using a negative temperature coefficient sensor (10). The sensor has a signal processing stage (11) associated therewith, which stage includes one or more transistors (T) arranged in parallel with one or more so-called pull up resistors (R1, R1A...R1N). An analog-digital converter (13) receives a voltage (VB0, VB1) from an intermediate point between the sensor (10) and pull-up resistors. The method is characterised in that: the transistor (T) is controlled on the basis of a so-called square voltage, so that it switches alternately and regularly between an on state and an off state; the value of voltage (VRT) is measured at an analog input (12) of converter (13) when said transistor (T) is in an on state and when it is in an off state; a saturation voltage (VCE) of said transistor is determined from the two measured values; and the value of a corrected voltage (N0corr, N1corr) and the temperature around said sensor (10) are derived therefrom. A device for implementing said method is further described. The invention is particularly useful for automotive electronic systems.</p> |
