1
Low Power Ambient Light and Proximity Sensor with
Intelligent Interrupt and Sleep Modes - Analog and
Digital Out
ISL29030A
The ISL29030A is an integrated ambient and infrared
light-to-digital converter with a built-in IR LED driver and I
2
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 of
2000 lux) in 100ms per sample. The ADC rejects 50Hz/60Hz
flicker noise caused by artificial light sources. The I
ALS
pin
provides an analog output current proportional to the
measured light (420μA FSR).
For proximity sensor (Prox) data conversions, the built-in driver
turns on an external 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 540μs
conversion time.
The ISL29030A provides low-power operation of the ALS and
proximity sensing, with a typical 138μA normal operation current
(110μA for sensors and internal circuitry; ~28μA for external LED,
with 220mA current pulses for a net 100μs, repeating every
800ms or under).
The ISL29030A 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 can configure the device so that ALS
and proximity interrupts occur simultaneously, up to 16 times
in a row, before the interrupt pin is activated.
The ISL29030A is designed to operate at 2.25V to 3.63V over the
-40°C to +85°C ambient temperature range. It is packaged in a
clear, lead-free 8 lead ODFN package.
Pin Configuration
ISL29030A
8 LD ODFN (2.0x2.1x0.7mm)
TOP VIEW
Features
• Works Under All Light Sources Including Sunlight
• Dual ADCs Measure ALS/Prox Concurrently
• Intelligent Interrupt Scheme Simplifies Microcontroller Code
Ambient Light Sensing
• Simple Output Code Directly Proportional to Lux
• 50Hz/60Hz Flicker Noise and IR Rejection
• Light Sensor Close to Human Eye Response
• Selectable 125/2000 Lux Range
•Analog 420μA Output Pin I
ALS
Proportional to Lux
Proximity Sensing
• Proximity Sensor with Broad IR Spectrum
- Can Use 850nm and 950nm External IR LEDs
• IR LED Driver with I
2
C Programmable Sink Currents
-Net 100μs Pulse with 110mA or 220mA Amplitudes
- Periodic Sleep Time Up to 800ms Between Pulses
• Ambient IR Noise Cancelation (Including Sunlight)
Intelligent and Flexible Interrupts
• Independent ALS/Prox Interrupt Thresholds
• Adjustable Interrupt Persistency
- 1/4/8/16 Consecutive Triggers Required Before Interrupt
Ultra Low Power
•138μA DC Typical Supply Current for ALS/Prox Sensing
-110μA for Sensors and Internal Circuitry
-28μA Typical Current for External IR LED (Assuming 220mA
for 100μs Every 800ms)
•<1.0μA Supply Current When Powered Down
Easy to Use
• Set Registers; Wait for Interrupt
•I
2
C (SMBus Compatible) Output
• Temperature Compensated
• Tiny ODFN8 2.0x2.1x0.7 (mm) Package
Additional Features
• 1.7V to 3.63V Supply for I
2
C Interface
• 2.25V to 3.63V Sensor Power Supply
• Pb-Free (RoHS compliant)
Applications
• Display and Keypad Dimming Adjustment and Proximity
Sensing for:
- Mobile Devices: Smart Phone, PDA, GPS
- Computing Devices: Laptop PC, Netbook
- Consumer Devices: LCD-TV, Digital Picture Frame, Digital
Camera
• Industrial and Medical Light and Proximity Sensing
1
2
3
8
7
6
I
ALS
VDD
GND
IRDR
INT
SDA
4 5
REXT
SCL
THERMAL
PAD
*THERMAL PAD CAN BE CONNECTED TO GND OR
ELECTRICALLY ISOLATED
November 12, 2012
FN7722.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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