SEMICONDUCTOR INTEGRATED CIRCUIT FOR OPTICAL SENSOR

摘要

PROBLEM TO BE SOLVED: To provide a semiconductor integrated circuit for an optical sensor capable of performing a highly-accurate visibility correction.SOLUTION: A semiconductor integrated circuit 1 for an optical sensor according to an embodiment receives environment light via a cover member 3 which attenuates visible light and transmits infrared light and a condenser lens 2, corrects visibility on the basis of an amount of the received light, and detects illuminance of the environment light. The semiconductor integrated circuit 1 comprises: a first light-receiving element 21 having first spectral characteristics; a second light-receiving element 22 having second spectral characteristics; and visibility correcting means 30 for correcting visibility according to outputs of the first light-receiving element 21 and the second light-receiving element 22. The visibility correcting means 30 comprises: an AD conversion unit 313 which converts the output of the first light-receiving element 21 and the output of the second light-receiving element 22 from analog to digital in time sharing; and an arithmetic logical unit 318 which subtracts each digital signal converted by the AD conversion unit 313.