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 - 8 . (canceled) 
     
     
         9 . A vehicle system comprises an electric power assist steering unit, which comprising:
 a motor for power assisting a steering;   an angular sensor of the motor; and   a semiconductor processing system comprising an analog/digital converter, a sensor interface, a motor driver, and a communication interface, wherein   the motor is supplied a control current from the motor driver of the semiconductor processing system,   the angular sensor senses a rotate angle of the motor, and supplies an analog signal based on the rotate angle to the sensor interface,   the analog/digital converter receives the analog signal supplied from the angular sensor for converting the analog signal to a digital information, and add an order information to the digital information, and   the communication interface is used for communicating with other electrical control unit.   
     
     
         10 . A vehicle system according to claim  1 , further comprising
 an steering wheel control unit coupled with the electric power assist steering unit via a CAN network, wherein
 the steering wheel control unit receives the digital information with the order information supplied from the electric power assist steering unit, and controls an angle of a steering wheels.