Description

The STK3420 is an integrated ambient and infrared lightto digital converter with a built-in IR LED and I2Cinterface. This device provides not only ambient lightsensing to allow robust backlight/display brightnesscontrol but also infrared sensing to allow proximityestimation and gesture recognition featured withinterrupt function.

For ambient light sensing, the STK3420 incorporates aphotodiode, timing controller and ADC in a single chip.For proximity sensing, the STK3420 also incorporates aphotodiode, timing controller and ADC in the same chip.The spectral response of STK3420 is optimized forwavelength 940nm infrared light. The STK3420 providesa noise cancellation scheme to highly reject unwantedambient IR noise. For gesture recognition, the STK3420 provides multiphotodiodes to distinguish the movement of the object. Itcan be used to recognize 3D dimensions gesturerecognition: left / right / up / down / near / far.The STK3420 operating voltage range is 2.4V to 3.6V.Feature
Integrated ambient light sensor, proximity sensorand 3-D gesture sensor function.Proximity Sensor
16 bits resolution for proximity detection
Built-in LED driver with flexible setting– LED turn-on time : 7 steps IT– LED current : 50 / 100 / 150 mA
Flexible interrupt setting– Several interrupt modes meet applicationrequirements.– Flag modes are included.– Intelligent persistence to speed up theresponse time : 1 / 2 / 4 / 8 times
Low noise design
Ambient IR noise cancellation– Immunity to 50Hz/60Hz fluorescent lightflicker

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 : 7 steps IT
Flexible interrupt setting– Interrupt while out-of- window– Persistence : 1 / 2 / 4 / 8 times
IR sensing mode

Gesture
3-D gesture recognition, left / right / up / down /near / far.
Background noise cancellation.
128 bytes data FIFO.General
Fully digital control with I2C interface– 1.7 ~ 3.6V I2C interface
Low power design– Standby mode– Wait mode
VDD wide operation voltage : 2.4~3.6V
Excellent temperature compensation: -40 to 85°C
Package: 3.94x2.36x1.35(mm)
Lead-free package (RoHS compliant)