STK3311-X

Ambient Light Sensor and Proximity Sensor with Built-in IR LED

1. OVERVIEW

Description

The STK3311-X is an integrated ambient and infrared light to digital converter with a built-in IR LED and I2C interface. This device provides not only ambient light sensing to allow robust cklight/display brightness control but also infrared sensing to allow proximity estimation featured with interrupt function. For ambient light sensing, the STK3311-X incorporates a photodiode, timing controller and ADC in a single chip. The excellent spectral response is designed to be closeto human eye. The STK3311-X is suitable for detecting a wide range of light intensity environment. For proximity sensing, the STK3311-X also incorporates a photodiode, timing controller and ADC in the same chip. The spectral response of STK3311-X is optimized for wavelength 940nm infrared light. The STK3311-X provides programmable duty setting to drive IR LED and employs a noise cancellation scheme to highly reject unwanted ambient IR noise. The proximity sensor is optimized so that the black card at 0-cm can be detected. Please contact with sensortek for further application solution. The STK3311-X has excellent temperature compensation, robust on-chip refresh rate setting without external components.  oftware shutdown mode control is provided for power saving application. The STK3311-X operating voltage range is 1.7V to 3.6V.

Feature

Integrated ambient light sensor, proximity sensor and infrared LED in one package.

Proximity Sensor

16 bits resolution for proximity detection
Built-in LED driver with flexible setting 

– LED turn-on time : 16 steps IT x 64 duty cycle options

– LED current : 12.5 / 25 / 50 / 100 mA

Flexible interrupt setting

– Several interrupt modes meet application requirements.

– Flag modes are included.

– Interrupt persistence : 1 / 4 times

Low noise design

Ambient IR noise cancellation

– Immunity to 50Hz/60Hz fluorescent light flicker

940nm LED for STK3311-X.

Ambient Light Sensor

Convert ambient light intensity to 16-bit digital data format

3rd generation ambient light sensor which closes to human-eye response and suppress IR portion

– Read the Illuminance directly; unlike conventional solution calculated from two diodes’ data

Flexible digital settings

– Integration time : 0.2ms~6400ms

Flexible interrupt setting

– Interrupt while out-of- window

– Persistence : 1 / 4 times

IR sensing mode

General

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 : 1.7~3.6V

Excellent temperature compensation: -40 to 85°C

Available package options: OLGA

– STK3311-X : 3.94x2.36x1.35(mm)

Lead-free package (RoHS compliant)

Applications

Mobile Phone, Smart-phone, PDA