ISL29043_14 Datasheet, PDF (1/16 Pages) Intersil Corporation – Low Power Ambient Light and Proximity Sensor with Internal IR-LED and Digital Output

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Low Power Ambient Light and Proximity Sensor with
Internal IR-LED and Digital Output
ISL29043
The ISL29043 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 540μs
conversion time.
The ISL29043 provides low power operation of ALS and
proximity sensing with a typical 136μA normal operation
current (110μA for sensors and internal circuitry, ~28μA for
LED) with 220mA current pulses for a net 100μs, repeating
every 800ms (or under).
The ISL29043 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 ISL29043 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 10 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”
R1
10kΩ
V_DD
V_{LED SLAVE_0}
1 _{LED+ LED-} 10
C1
1.0µF
2
ADDR0
IRDR
9
C2 C3
1µF 0.1µF
3 _VDD
4 _GND
5 _REXT
INT ⁸
SDA ⁷
SCL ⁶
ISL29043
R_EXT
499kΩ
R2 R3
10kΩ 10kΩ
V_I2C PULL-UP
SLAVE_1
SDA
SCL
I²C SLAVE_n
SDA
SCL
I²C MASTER
µCONTROLLER
INT
SDA
SCL
FIGURE 1. TYPICAL APPLICATION DIAGRAM
255
204
110mA (18% GREY CARD)
153
220mA (18% GREY CARD)
102
110mA (WHITE COPY PAPER)
220mA (WHITE COPY PAPER)
51
0
0
25
50
75
100
125
150
DISTANCE (mm)
FIGURE 2. PROXIMITY RESPONSE vs DISTANCE
February 9, 2012
1
FN7935.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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