INTERSIL ISL29147

Low Power Ambient Light and Proximity Sensor with
Enhanced Infrared Rejection
ISL29147
Features
The ISL29147 is a low power Ambient Light Sensor (ALS) and
proximity (PROX) sensor. It has a built-in IR-LED for the
proximity function. The ALS function measures the amount of
light (in the visible spectrum) incident on the ISL29147.
• Internal IR-LED and sensor for a complete solution
• Ideal for applications under dark or tinted glass
• Enhanced ambient sunlight rejection to 40k Lux
• Programmable proximity sleep time between proximity
measurements optimizes power consumption
The ALS function has a programmable ambient IR-rejection,
which allows fine tuning of light source variations and is ideal
for light sensor applications under dark protective glass. The
ALS provides a 12-bit measurement. A passive optical filter
removes unwanted wavelengths (IR or Ultraviolet) to ensure
accurate ALS measurement.
• Hardware interrupt - no polling required
• Programmable IR compensation to fine-tune ALS
performance for various glass compositions
• Programmable IR LED drive current to 250mA
The proximity function includes a new offset adjustment to
compensate for the IR light reflected off the inside of the
protective glass cover and back to the ISL29147 sensor. This
offset adjustment allows the sensor to compensate for these
internal reflections and preserve the dynamic range of the
proximity measurement.
• Operates from 2.25V to 3.63V VDD
• Power-down IDD, typical 0.2µADC
• Tiny 2.40x4x1.2 (mm) optical co-package
Applications
The built-in current-driver pulses an external infrared LED at a
programmed current for 90µs. The infrared light that is
reflected and received by the ISL29147 is digitized by an 8-bit
ADC. The proximity sensor also has a passive optical filter
designed to pass IR and reject visible wavelengths.
• Display dimming and adjustment
- Mobile devices: smart phones, PDA, GPS
- Computing: monitors, laptops, notebooks
- Picture frames, tablet-PCs, LCD-TV
The ISL29147 provides a hardware pin to indicate an interrupt
event. The interrupt pin saves power as the host micro-controller
can ‘wake-up’ on an interrupt event and does not need to poll
the device for an interrupt event. The interrupt generator is
user configurable and provides several options for ALS and
PROX trigger configurations. The ISL29147 supports an SMBus
compatible I2C interface for configuration and control.
• Object detection
- Touchscreen disabling
- Smart power-saving
VDD_PULLUP
VDD_IRLED
VDD
R1
100Ω
C1
1µF
C2
1µF
SCL, SDA and
INT PULLUPs
U1
5
VDD
6
SCL
7
GND
8
LED+
4
SDA
3
INT 2
IRDR
1
LED-
SMBus MASTER
SCL
SDA
INT
ISL29147
R1: 100Ω 5% RESISTOR
C1, C2: 1µF CERAMIC 10V CAPACITOR
FIGURE 1. TYPICAL APPLICATIONS CIRCUIT
September 16, 2013
FN8409.0
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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ISL29147
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in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
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without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
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2
FN8409.0
September 16, 2013