Patent ID: 9029771
Filing Date: 2015-05-12
Classification: G01S,G06F,H03K

Abstract:
1. A semiconductor device, comprising: first to N-th (N is an integer not smaller than 2) driving terminals connected to first to N-th infrared emitting units, respectively; a driving unit driving said first to N-th infrared emitting units through said first to N-th driving terminals to cause light emission from said first to N-th infrared emitting units at mutually different timings; a first light receiving unit receiving infrared light emitted from said first to N-th infrared emitting units and reflected by a reflecting object, and generating a photo-electric current of a level corresponding to intensity of the received infrared light; an operation control unit generating first to N-th pieces of infrared light information indicating intensity of infrared light emitted from said first to N-th infrared emitting units respectively and reflected by said reflecting object, based on the photo-electric current generated by said first light receiving unit; and an output terminal for outputting said first to N-th pieces of infrared light information to an outside, wherein said operation control unit includes a first register for storing pieces of information related to setting of first to N-th driving currents; and wherein said driving unit supplies the first to N-th driving currents to said first to N-th infrared emitting units based on said pieces of information stored in said first register to cause light emission by said first to N-th infrared emitting units, respectively.