ISL29018 Digital Ambient Light Sensor and Proximity Sensor with Interrupt Function
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 userselected 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.
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Evaluation Board 、 Digital Ambient Light Sensor and Proximity Sensor with Interrupt Function |
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[ 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 ] |
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Datasheet |
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ESD 、 IPC/JEDEC J STD-020 、 ISO9001 、 Pb-free 、 RoHS |
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Please see the document for details |
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8 Ld ODFN |
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English Chinese Chinese and English Japanese |
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October 8, 2012 |
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Rev 4.00 |
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FN6619 |
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1.4 MB |
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