Low Power Ambient Light and Proximity Sensor with
Internal IR-LED and Digital Output
ISL29044
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
The ISL29044 is an integrated ambient and infrared
2
light-to-digital converter with a built-in IR LED and I C 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.
• Pb-Free (RoHS compliant)
Intelligent and Flexible Interrupts
• Independent ALS/Prox interrupt thresholds
• Adjustable interrupt persistency
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.
- 1/4/8/16 consecutive triggers required before interrupt
Applications
• Display and keypad dimming adjustment and proximity
sensing for:
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).
- 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
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.
Related Literature
• See AN1436, “Proximity Sensors”
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.
V_LED
V_PULLUP
100
90
2
I C SLAVE 0
80
R1
R2
R3
5
6
7
8
4
3
2
1
C3
RES1
RES1 RES1
LED- LED+
IRDR GND
70
0.1µF
220mA WHITE
60
2
I C MASTER
50
SCL
SDA
INT
INT
SCL
110mA WHITE
40
SDA VDD
VDD
2
2
I C SLAVE_n
SCL
I C SLAVE 1
30
C2
1µF
220mA GREY
C1
CONTROLLER
ISL29044
SCL
20
0.1µF
SDA
SDA
10
110mA GREY
0
2
2
I C-DIAGRAM
I C-DIAGRAM
0
20
40
60
80
100
120
140
160
DISTANCE (mm)
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. PROXIMITY RESPONSE vs DISTANCE
October 30, 2012
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.
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