Analog/digital conversion circuit, semiconductor device, and electric power steering controlling unit

Abstract

The present invention provides a method in which a counting source is provided in data after analog/digital conversion to lessen a load placed when new and old data after the conversion are compared to each other. A log function is prepared in an A/D conversion controlling circuit. The log function latches the output of a counter in a 12-bit digital/analog converter at the timing of outputting a pulse from a comparator to determine data written into a data register group. In the case where a setting item related to log output in an ADCR is set at 1, not only the output of the 12-bit digital/analog converter, but also the output of a timer counter of an MTU is latched as a log.

1 - 5 . (canceled) 
     
     
         6 . An electric control unit used in an automobile, comprising:
 a data processor arranged on a semiconductor substrate, comprising a central processing unit, an analog/digital conversion circuit, and a motor driver;   a data communication interface; and   a sensor interface,   wherein the analog/digital conversion circuit comprises a counter, and analog/digital converter, outputs a digital converted data, which is obtained by converting an analog signal received from the sensor interface, with a counter value, and   wherein the central processing unit controls the motor driver for controlling a motor in the automobile based on the digital converted data.   
     
     
         7 . An electric control unit according to  claim 6 ,
 wherein the analog signal received from the sensor interface is provided from an angle sensor of the motor, which is an assist motor of a steering.