ISL29044IROMZ-T7 Datasheet, PDF (1/19 Pages) Intersil Corporation – Low Power Ambient Light and Proximity Sensor with Internal IR-LED and Digital Output

NORTECROEMCOMMENMDEENIDSDLER2DE9P0F4LO4ARACNEEMWENDTEPSAIGRNTS
Low Power Ambient Light and Proximity Sensor with
Internal IR-LED and Digital Output
ISL29044
The ISL29044 is an integrated ambient and infrared
light-to-digital converter with a built-in IR LED and I²C Interface
(SMBus Compatible). This device uses two independent ADCs
for concurrently measuring ambient light and proximity in
parallel. The flexible interrupt scheme is designed for minimal
microcontroller utilization.
For ambient light sensor (ALS) data conversions, an ADC
converts photodiode current (with a light sensitivity range up to
2000 Lux) in 100ms per sample. The ADC rejects 50Hz/60Hz
flicker noise caused by artificial light sources.
For proximity sensor (Prox) data conversions, the built-in driver
turns on an internal infrared LED and the proximity sensor ADC
converts the reflected IR intensity to digital. This ADC rejects
ambient IR noise (such as sunlight) and has a 547μs
conversion time.
The ISL29044 provides low power operation of ALS and
proximity sensing with a typical 133μA normal operation
current (108μA for sensors and internal circuitry, ~25μA for
LED) with 220mA current pulses for a net 100μs, repeating
every 800ms (or under).
The ISL29044 uses both a hardware pin and software bits to
indicate an interrupt event has occurred. An ALS interrupt is
defined as a measurement that is outside a set window. A
proximity interrupt is defined as a measurement over a
threshold limit. The user may also require that both ALS/Prox
interrupts occur at once, up to 16 times in a row before
activating the interrupt pin.
The ISL29044 is designed to operate from 2.25V to 3.63V over
the -40°C to +85°C ambient temperature range. It is
packaged in a clear, lead-free 8 Ld ODFN package.
Features
• Internal LED + Sensor = Complete Solution
• Works under all light sources including sunlight
• Dual ADCs measure ALS/Prox concurrently
• <1.0μA Supply current when powered down
• Temperature compensated
• Pb-Free (RoHS compliant)
Intelligent and Flexible Interrupts
• Independent ALS/Prox interrupt thresholds
• Adjustable interrupt persistency
- 1/4/8/16 consecutive triggers required before interrupt
Applications
• Display and keypad dimming adjustment and proximity
sensing for:
- Mobile devices: Smart phone, PDA, GPS
- Computing devices: Laptop PC, Netbook, Tablet PC
- Consumer devices: LCD-TV, digital picture frame, digital
camera
- Industrial and medical light and proximity sensing
Related Literature
• See AN1436, “Proximity Sensors”
V_LED
V_PULLUP
I²C SLAVE 0
5 _{LED- LED+} 4
6 _{IRDR GND} 3
7 _{INT SCL} 2
8 _{SDA VDD} 1
ISL29044 C1
0.1µF
C3
0.1µF
R1
RES1
VDD
I²C SLAVE 1 I²C SLAVE_n
C2
1µF
SCL
SCL
SDA
SDA
I²C-DIAGRAM I²C-DIAGRAM
R2
RES1
R3
RES1
I²C MASTER
SCL
SDA
INT
CONTROLLER
FIGURE 1. TYPICAL APPLICATION
100
90
80
70
60
50
40
30
20
10
110mA GREY
0
0
20 40
220mA WHITE
110mA WHITE
220mA GREY
60 80 100 120 140 160
DISTANCE (mm)
FIGURE 2. PROXIMITY RESPONSE vs DISTANCE
October 30, 2012
1
FN8305.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.