Optical Sensor
Product Data Sheet
LTR-381RGB-WA
Spec No. :DS86-2017-0037
Effective Date: 03/03/2018
Revision: -
LITE-ON DCC
RELEASE
BNS-OD-FC001/A4
LITE-ON Technology Corp. / Optoelectronics
No.90,Chien 1 Road, Chung Ho, New Taipei City 23585, Taiwan, R.O.C.
Tel: 886-2-2222-6181 Fax: 886-2-2221-1948 / 886-2-2221-0660
http://www.liteon.com/opto
OPTICAL SENSOR
LTR-381RGB-WA
Description
The LTR-381RGB-WA is an integrated low voltage I2C
ambient light sensor (ALS) and a color sensor (CS) in a
single 2x2mm miniature ChipLED lead-free surface mount
package.
With the advanced RGB color sensor, this sensor converts
light (Red, Green, Blue, and IR) intensity to a digital output
signal capable of direct I2C interface. The ALS provides a
linear response over a wide dynamic range, which is well
suited to applications under very low or bright ambient
brightness.
The sensor has a programmable interrupt with hysteresis
to response to events and that removes the need to poll the
sensor for a reading which improves system efficiency.
This CMOS design and factory-set one time trimming
capability ensure minimal sensor-to-sensor variations for
ease of manufacturability to the end customers.
•
RGB/ALS Features
Features
•
•
•
•
•
•
•
•
I
2
C interface (Standard mode @100kHz or Fast mode
@400kHz)
Ambient Light / Advanced RGB in ultra-small chipled
package
Very low power consumption with sleep mode
capability
Operating voltage ranges: 1.7V to 3.6V
Operating temperature ranges: -40 to +85 ºC
Built-in temperature compensation circuit
Programmable interrupt function for ALS with upper
and lower thresholds
RoHS and Halogen free compliant
16 to 20 bits effective resolution
Wide dynamic range with linear response
Close to human eye spectral response
Automatic rejection for 50Hz/60Hz lighting
flicker
Application
Control brightness and color of display panel in mobile,
computing, and consumer devices.
Ordering Information
Part Number
LTR-381RGB-WA
Packaging Type
Tape and Reel
Package
6-pin chipled package
Quantity
2500
Part No. : LTR-381RGB-WA
BNS-OD-FC002/A4
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OPTICAL SENSOR
LTR-381RGB-WA
2. Functional Block Diagram
LTR-381RGB-WA contains different photodiodes for ALS/CS (red, green, blue, and IR channel) measurement.
The photodiode currents are converted to digital values by ADCs. The sensor also includes some peripheral
circuits such as an internal oscillator, a current source, voltage reference, and internal fuses to store trimming
information.
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Part No. : LTR-381RGB-WA
BNS-OD-FC002/A4
OPTICAL SENSOR
LTR-381RGB-WA
3. Application Circuit
I/O Pins Configuration Table
Pin
1
2
3
4
5
6
I/O Type
Supply
Symbol
VDD
NC
Description
Power Supply Voltage
Reserved for internal test. Do not connect at application circuit level.
Ground
I
2
C serial clock. This pin is an open drain input.
Level Interrupt Pin. This pin is an open drain output.
I
2
C serial data. This pin is an open drain input / output.
Ground
I
O
I/O
GND
SCL*
INT*
SDA*
* Note: For noisy environment, add 10pF capacitor from signal to GND for additional noise filtering.
Recommended Application Circuit Components
Component
Rp1, Rp2, Rp3 [1]
C1
C2
Recommended Value
1 kΩ to 10 kΩ
0.1uF
1uF
Notes:
[1] Selection of pull-up resistors value is dependent on bus capacitance values. For more details, please refer to
I2C Specifications:
http://www.nxp.com/documents/user_manual/UM10204.pdf
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Part No. : LTR-381RGB-WA
BNS-OD-FC002/A4
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