CM36781 integrates a high sensitivity long distance proximity sensor (PS), ambient light sensor (ALS), and 940 nm IR LED into one small package. It incorporates photodiodes, amplifiers and analog to digital converting circuits into a single chip using a CMOS process. The 16-bit high resolution ALS offers excellent sensing capabilities with sufficient selections to fulfill most applications whether a dark or high transparency lens design. CM36781 offers individual programmable high and low threshold interrupt features for the best utilization of resources and power saving on the microcontroller. For the 12-bit proximity sensing function, CM36781 has a built in intelligent cancellation scheme that eliminates cross talk issues. The persistence feature prevents false judgment of proximity sensing due to ambient light noise.
The adoption of Vishay Capella's patented Filtron™ technology achieves the closest ambient light spectral sensitivity to real human eye responses. CM36781 provides excellent temperature compensation capability for keeping the output stable under changing temperature. . ALS and PS functions are easily operated via the simple command format of I2C (SMBus compatible) interface protocol. Operating voltage ranges from 2.5 V to 3.6 V.
Ambient Light Sensor
•High accuracy ALS of ±10%
•Selectable maximum detection range (1643286551311) lux with
highest sensitivity 0.003lux/step
•Immunity to red glow (940 nm IR LED)
•Smart persistence scheme to reduce PS response time
•Selectable for 12-bit PS output data