Other features of the VCNL4040 include a selectable resolution for the proximity function, either 12- of 16-bit, the use of our patented Filtron technology to yield the best ambient light sensing performance second only to the human eye, interrupt thresholds, temperature compensation, I2C interface all in a tiny 4 x 2  x 1 mm surface mount package. If you have experience in Optoelectronics, you know that sunlight can render optics unusable. Not so with the VCNL4040 which has robust performance in direct sunlight.  Finally, in many applications, the VCNL4040 will be idle or in sleep-mode which is why we have driven the current consumption down to 0.2 µA.