ISL29018_14 Datasheet, PDF (1/19 Pages) Intersil Corporation – Digital Ambient Light Sensor and Proximity Sensor with Interrupt Function

Digital Ambient Light Sensor and Proximity Sensor with
Interrupt Function
ISL29018
The ISL29018 is an integrated ambient and infrared light to
digital converter with a built-in IR LED driver and I²C Interface
(SMBus Compatible). This device provides not only ambient light
sensing to allow robust backlight/display brightness control but
also infrared sensing to allow proximity estimation featured with
interrupt function.
For ambient light sensing, an internal ADC has been designed
based on the charge-balancing A/D conversion technique. The
ADC conversion time is nominally 90ms and is user adjustable
from 11µs to 90ms, depending on oscillator frequency and ADC
resolution. This ADC is capable of rejecting 50Hz and 60Hz flicker
noise caused by artificial light sources. The lux-range-select
feature allows users to program the lux range for optimized
counts/lux.
For proximity sensing, the ADC is used to digitize the output signal
from the photodiode array when the internal IR LED driver is
turned on and off for the programmed time periods under user-
selected modulation frequency to drive the external IR LED. As
this proximity sensor employs a noise cancellation scheme to
highly reject unwanted IR noise, the digital output of proximity
sensing decreases with distance. The driver output current is user
selectable up to 100mA to drive different types of IR emitters
LEDs.
Six different modes of operation can be selected via the I2C
interface: Programmable ALS once with auto power-down,
programmable IR sensing once, programmable proximity sensing
once, programmable continuous ALS sensing, programmable
continuous IR sensing and programmable continuous proximity
sensing. The programmable one-time operation modes greatly
reduce power because an immediate automatic shutdown
reduces overall supply current less than 0.5µA.
The ISL29018 supports both hardware and software interrupts
that remain asserted until the host clears it through I²C interface
for ambient light sensing and proximity detection.
Designed to operate on supplies from 2.25V to 3.63V, the
ISL29018 is specified for operation over the -40°C to +85°C
ambient temperature range. It is packaged in a clear, Pb-free 8 Ld
ODFN package.
Applications
• Display and Keypad Dimming Adjustment and Proximity
Sensing for:
- Mobile Devices: Smart Phone, PDA, GPS
- Computing Devices: Notebook PC, Webpad
- Consumer Devices: LCD-TV, Digital Picture Frame, Digital
Camera
• Industrial and Medical Light and Proximity Sensing
Features
Proximity Sensing
• Ambient IR Cancellation During Proximity Sensing
- Works Under Direct Sunlight
• IR LED Driver with Programmable Source Current
- Adjustable Current Drive from 100mA to 12.5mA
• Programmable LED current Modulation Frequency
• Variable Conversion Resolution
Ambient Light Sensing
• Simple Output Code Directly Proportional to lux
• Adjustable Sensitivity up to 65 Counts per lux
• Selectable Range (via I²C)
- Range 1 = 0.015 lux to 1,000 lux
- Range 2 = 0.06 lux to 4,000 lux
- Range 3 = 0.24 lux to 16,000 lux
- Range 4 = 0.96 lux to 64,000 lux
• Integrated 50/60Hz Noise Rejection
• Works Under Various Light Sources, Including Sunlight
Ideal Spectral Response for Light and Proximity Sensor
• Light Sensor Close to Human Eye Response
- Excellent Light Sensor IR and UV Rejection
• Proximity sensor range from 850nm to 950nm
- Can use either 850nm or 950nm LED solution
Ultra Low Power
• 90μA Max Operating Current
• Software Shutdown and Automatic Shutdown
- 0.5μA Max Shutdown Current
Easy to Use
• I²C (SMBus Compatible) Output
• No Complex Algorithms Needed
• Temperature Compensated
• Small Form Factor
- 8 Ld 2.0mmx2.1mmx0.7mm ODFN Package
Additional Features
• I²C and SMBus Compatible
• 1.7V to 3.63V Supply for I²C Interface
• 2.25V to 3.63V Sensor Power Supply
• Pb-Free (RoHS compliant)
October 8, 2012
1
FN6619.4
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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