STK3311-X REV 0.9.2
www.sensortek.com.tw @copyright 2016 Sensortek Technology Corp.
1. OVERVIEW
Description
The STK3311-X is an integrated ambient and infrared
light to digital converter with a built-in IR LED and I
2
C
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 STK3311-X incorporates
a photodiode, timing controller and ADC in a single chip.
The excellent spectral response is designed to be close-
to 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. Software 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 I
2
C interface
– 1.7 ~ 3.6V I
2
C interface
Low power design
– Standby mode
– Wait mode
Time-multiplexing for sensing
V
DD
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
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