Description

The STK3311-SA is an integrated ambient and infraredlight to digital converter with a built-in 850nm VCSEL(Vertical-Cavity Surface-Emitting Laser) diode and I2Cinterface. This device provides not only ambient lightsensing to allow robust backlight/display brightnesscontrol but also infrared sensing to allow proximityestimation featured with interrupt function.For ambient light sensing, the STK3311-SA incorporatesa photodiode, timing controller and ADC in a single chip.The excellent spectral response is designed to be closeto human eye. The STK3311-SA is suitable for detectinga wide range of light intensity environment.For proximity sensing, the STK3311-SA alsoincorporates a photodiode, timing controller and ADC inthe same chip. The spectral response is optimized forwavelength 850nm infrared light. The STK3311-SAprovides programmable duty setting to drive 850nmVCSEL diode and due to the low driving current of theVCSEL diode, the power consumption of the wholeproximity application can be largely reduced.The STK3311-SA has excellent temperaturecompensation, robust on-chip refresh rate settingwithout external components. Software shutdown modecontrol is provided for power saving application. TheSTK3311-SA operating voltage range is 2.7V to 3.6V.

Feature

Integrated ambient light sensor, proximity sensorand 850nm VCSEL diode in one package.Proximity Sensor
16 bits resolution for proximity detection
Built-in VCSEL driver with flexible setting– VCSEL turn-on time : 16 steps IT x 64 dutycycle options– VCSEL current : 12.5 mA
Flexible interrupt setting– Several interrupt modes meet applicationrequirements.– Flag modes are included.– Interrupt persistence : 1 / 4 times
Low noise design
Ambient IR noise cancellation– Immunity to 50Hz/60Hz fluorescent lightflicker

Built-in 850 nm VCSEL diode.

Ambient Light Sensor

Convert ambient light intensity to 16-bit digital dataformat
3rd generation ambient light sensor which closes tohuman-eye response and suppress IR portion– Read the Illuminance directly; unlikeconventional solution calculated from twodiodes’ data
Flexible digital settings– Integration time : 0.2ms~6400ms
Flexible interrupt setting– Interrupt while out-of-window– Persistence : 1 / 4 times
IR sensing modeGeneral
Fully digital control with I2C interface– 1.7 ~ 3.6V I2C interface
Low power design– Standby mode– Wait mode
Time-multiplexing for sensing
VDD wide operation voltage : 2.7~3.6V
Excellent temperature compensation: -40 to 85°C
Available Package Options:– STK3311-SA : 3.94x2.36x1.35(mm)
Lead-free package (RoHS compliant)