STK3338-V

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

1. OVERVIEW

Description

The STK3338-V is an integrated ambient and infrared light to digital converter with a built-in 940nm VCSEL (Vertical-Cavity Surface-Emitting Laser) diode and I2C interface. This device provides not only ambient light sensing to allow robust backlight/display brightness control but also infrared sensing to allow proximity estimation featured with interrupt function. For ambient light sensing, the TK3338-V incorporates a photoiode, timing controller and ADC in a single chip. The excellent spectral response is designed to be close-to human eye. The STK3338-V is suitable for detecting a wide range of

light intensity environment. For proximity sensing, the STK3338-V also incorporates a photodiode, timing controller and ADC in the same chip. The spectral response of STK3338-V is optimized for wavelength 940nm infrared light. The STK3338-V provides programmable current setting to drive VCSEL and employs a noise cancellation scheme to highly reject unwanted ambient noise. The  K3338-V has excellent temperature compensation, robust on-chip refresh rate setting without external components. Software shutdown mode control is provided for power saving application. The STK3338-V operating voltagerange is 1.7V to 3.0V.

Feature

Integrated ambient light sensor, proximity sensor and 940nm VCSEL diode in one package.

Proximity Sensor

16 bits resolution for proximity detection 

Built-in VCSEL driver with flexible setting

– VCSEL turn-on time : 7 steps IT

– VCSEL current : 3.125 / 6.25/ 12.5 / 25 mA

Flexible interrupt setting

– Several interrupt modes meet application requirements.

– Flag modes are included.

– Intelligent persistence to speed up the response time : 1/2/4/16 times

Low noise design

High ambient light suppression

940nm VCSEL for STK3338-V.

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.

Flexible digital settings

– Integration time : 7 steps IT

Flexible interrupt setting

– Interrupt while out-of- window

– Persistence : 1/2/4/8 times

Clear channel for different light source compensation.

General

Fully digital control with I2C interface

– 1.7 ~ 3.6V I2C interface

Low power design

– Standby mode

– Wait mode

VDD operation voltage : 1.7~3.0V

Available package options: OLGA

– STK3338-V : 2.84 x 1.44 x 0.65 (mm)

Lead-free package (RoHS compliant)

Moisture Sensitivity Level 3

Applications

Mobile Phone, Smart-phone, PDA