RoHS Compliant Photo IC for Ambient Light Monitoring

The new RoHS compliant S9705 device consists of a photodiode, which is combined with a current to frequency conversion circuit fabricated using Hamamatsu “in house” CMOS process. The output from the S9705 is a square wave, with frequency between pulses directly proportional to the incident light intensity. This makes it very easy to measure light by “counting” the pulses using a digital counter. The S9705 has low noise and a wide dynamic range in excess of 100,000 and when combined with its high linearity, makes this device suitable for a wide range of light measurement applications.

The S9705 is ideal for applications such as brightness sensors for televisions and monitors, energy savers for liquid crystal displays, office and industrial lighting control, automatic contrast control functions as well as a wide variety of optical sensors and general light level measurement applications.