1 Overview

The OPT4001 is an ambient light sensor (ALS) with a digital output integrated circuit. It uses a two-wire interface that works with the I²C protocol making it ideal for many applications. The OPT4001YMN is the picostar package version of the OPT4001 device. The picostar package achieves very small size and thickness and orients with the photodiode facing down and senses light through a cutout in the board. This requires the sensor be soldered to a flex PCB in most applications to maximize the field of view of the sensor. The OPT4001YMNEVM is a platform for evaluating the performance of the OPT4001 under various conditions. The OPT4001YMNEVM consists of two PCBs. The first is the OPTMB EVM board, which is a motherboard. This board communicates with a computer through USB connection and provides power and sends and receives appropriate digital signals with the OPT4001 IC. The motherboard will relay USB commands from the EVM GUI software running on the PC to the OPT4001 IC through I²C. The second is the OPT4001YMN coupon board, which contains the OPT4001YMN and its support circuitry. The coupon board consists of a flex PCB soldered to a rigid board. This allows the coupon to be easily plugged and unplugged as the rigid board adds strength to the flex board.