OPTICAL SENSOR
LTR-91400
Description
@400kHz)
Gesture, Ambient Light, and Proximity Sensing in
one ultra-small ChipLED package
Very low power consumption with sleep mode
capability
Operating voltage ranges: 2.4V to 3.6V
Operating temperature ranges: -30 to +70 º
C
Programmable interrupt function for ALS, PS,
and GS.
Built-in temperature compensation circuit
RoHS and Halogen free compliant
LTR-91400
is an integrated low voltage I
2
C ambient light
sensor [ALS], gesture sensor [GS] and proximity sensor [PS],
with built-in emitter in a single miniature chipled lead-free
surface mount package.
This sensor converts light intensity to a digital output signal
capable of direct I2C interface. The gesture sensor provides
object motion direction information based on the reflected IR
light detected by the 4 photodiodes for East, West, North and
South direction. Besides, ambient light sensor provides a
linear response over a wide dynamic range and is well suited
to applications under high ambient brightness. With built-in
proximity sensor (emitter and detector), it offers the feature to
detect object at a user configurable distance.
The sensor supports an interrupt feature that removes the
need to poll the sensor for a reading which improves system
efficiency. The sensor also supports several features that help
to minimize the occurrence of false triggering. This CMOS
design and factory-set one time trimming capability ensure
minimal
sensor-to-sensor
variations
for
ease
of
GS Features
4 photodiodes for East, West, North and South
direction
32 dataset storage FIFO
8-bit effective resolution
Programmable LED drive settings
Programmable crosstalk correction
ALS Features
16-bits effective resolution
Wide dynamic range of 1:15,000,000 with linear
response
Close to human eye spectral response
Automatic rejection for 50Hz/60Hz lighting
flicker
manufacturability to the end customers.
PS Features
Built-in LED driver and detector
11-bit effective resolution
Programmable LED drive settings
Programmable crosstalk correction
High Ambient Light Suppression
Application
To control brightness of the display panel, and/or detection of
object or motion in mobile, computing, and consumer devices.
Features
I
2
C interface (Standard mode @100kHz or Fast mode
1/44
Part No. : LTR-91400
BNS-OD-FC002/A4
OPTICAL SENSOR
LTR-91400
2. Functional Block Diagram
LTR-91400 contains 5 integrated photodiodes (1 for ambient light and 4 photodiodes for East, West, North, and South
direction) for respective photocurrent measurement. The photodiode currents are converted to digital values by ADCs. The
sensor also included a driver circuit for an external IRLED, as well as some peripheral circuits such as an internal oscillator,
a current source, voltage reference, and internal fuses to store trimming information.
4/44
Part No. : LTR-91400
BNS-OD-FC002/A4
详细参数
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