ISL29021_14 Datasheet, PDF (1/12 Pages) Intersil Corporation – Digital Proximity Sensor with Interrupt Function

Data Sheet
March 3, 2009
ISL29021
FN6732.0
Digital Proximity Sensor with Interrupt
Function
The ISL29021 is an integrated proximity and infrared sensor
with a built-in IR LED driver and I²C Interface (SMBus
Compatible). This device provides infrared sensing to allow
proximity estimation featured with interrupt function.
For infrared and proximity sensing, an internal ADC has
been designed based on the charge-balancing A/D
conversion technique.
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.
Four different modes of operation can be selected via the I²C
interface: programmable IR sensing once, programmable
proximity sensing once, 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 ISL29021 supports both hardware and software
interrupts that remain asserted until the host clears it through
I²C interface for proximity detection.
Designed to operate on supplies from 2.5V to 3.63V, the
ISL29021 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.
Ordering Information
PART NUMBER
(Note)
TEMP. RANGE PACKAGE PKG.
(°C)
(Pb-Free) DWG. #
ISL29021IROZ-T7*
-40 to +85 8 Ld ODFN L8.2.1x2.0
ISL29021IROZ-EVALZ Evaluation Board
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach
materials and NiPdAu plate - e4 termination finish, which is RoHS
compliant and compatible with both SnPb and Pb-free soldering
operations. Intersil Pb-free products are MSL classified at Pb-free
peak reflow temperatures that meet or exceed the Pb-free
requirements of IPC/JEDEC J STD-020.
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 up to 16-bits
• Selectable Range (via I²C)
• Works Under Various Light Sources, Including Sunlight
Ideal Spectral Response for Proximity Sensor
• 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)
Applications
• Display and Keypad 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 Proximity Sensing
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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