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ISL29044A Folha de dados(PDF) 1 Page - Intersil Corporation

Nome de Peças ISL29044A
Descrição Electrónicos  Low Power Ambient Light and Proximity Sensor with Internal IR-LED and Digital Output
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Fabricante Electrônico  INTERSIL [Intersil Corporation]
Página de início  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

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Low Power Ambient Light and Proximity Sensor with
Internal IR-LED and Digital Output
ISL29044A
The ISL29044A 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
micro-controller utilization.
For ambient light sensor (ALS) data conversions, an ADC
converts photodiode current (with a light sensitivity range up to
3200Lux) 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 ISL29044A 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 ISL29044A 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 ISL29044A 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”
FIGURE 1. TYPICAL APPLICATION
LED-
5
IRDR
6
LED+ 4
VDD 1
INT
7
SDA
8
GND 3
SCL 2
I2C SLAVE 0
ISL29044A
SCL
SDA
I2C SLAVE 1
I2C-DIAGRAM
SCL
SDA
I2C SLAVE_n
I2C-DIAGRAM
INT
SCL
SDA
I2C MASTER
CONTROLLER
R1
RES1
R2
RES1
R3
RES1
C1
0.1µF
C2
1µF
C3
0.1µF
V_LED
V_PULLUP
VDD
April 19, 2013
FN8419.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|Copyright Intersil Americas LLC 2013. 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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