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Proximity Sensor with Intelligent Interrupt and Sleep Modes
ISL29027
The ISL29027 is an integrated infrared light-to-digital converter
with a built-in IR LED driver and I 2 C Interface (SMBus Compatible).
The flexible interrupt scheme is designed for minimal
microcontroller utilization.
For proximity sensor (Prox) data conversions, the built-in driver turns
on an external 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 540 μ s conversion time.
The ISL29027 provides proximity sensing with a typical 138 μ A
normal operation current (110 μ A for sensors and internal circuitry,
~28 μ A for external LED) with 220mA current pulses for a net 100 μ s,
repeating every 800ms (or under).
The ISL29027 uses both a hardware pin and software bits to
indicate an interrupt event has occurred. A proximity interrupt is
defined as a measurement over a threshold limit. The user may
also require that proximity interrupts occur at once, up to 16
times in a row before activating the interrupt pin.
The ISL29027 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 8 lead ODFN package.
Applications
- Mobile Devices: Smart Phone, PDA, GPS
- Computing Devices: Laptop PC, Netbook
- Consumer Devices: LCD-TV, Digital Picture Frame, Digital
Camera
Features
? Works Under All Light Sources Including Sunlight
? Intelligent Interrupt Scheme Simplifies μ C Code
Proximity Sensing
? Proximity Sensor with Broad IR Spectrum
- Can Use 850nm and 950nm External IR LEDs
? IR LED Driver with I 2 C Programmable Sink Currents
- Net 100 μ s Pulse with 110mA or 220mA Amplitudes
- Periodic Sleep Time up to 800ms Between Pulses
? Ambient IR Noise Cancellation (Including Sunlight)
Intelligent and Flexible Interrupts
? Proximity Interrupt Thresholds
? Adjustable Interrupt Persistency
- 1/4/8/16 Consecutive Triggers Required Before Interrupt
Ultra Low Power
? 138 μ A DC Typical Supply Current for Prox Sensing
- 110 μ A for Sensors and Internal Circuitry
- 28 μ A Typical Current for External IR LED (Assuming 220mA
for 100 μ s Every 800ms)
? <1.0 μ A Supply Current When Powered Down
Easy to Use
? Set Registers; Wait for Interrupt
? I 2 C (SMBus Compatible) Output
? Temperature Compensated
? Tiny ODFN8 2.0x2.1x0.7 (mm) Package
Additional Features
? 1.7V to 3.63V Supply for I 2 C Interface
? 2.25V to 3.63V Sensor Power Supply
? Pb-Free (RoHS Compliant)
? I 2 C Address Selection Pin
2
COMMAND
REGISTER
LIGHT DATA
PROCESS
IR
CHANNEL
ADC
DATA
REGISTER
1
ADDR0
IR PHOTODIODE
ARRAY
IREF
I 2 C
5
6
SCL
SDA
4
REXT
FOSC
3
GND
INTERRUPT
IR DRIVER
7
8
INT
IRDR
FIGURE 1. BLOCK DIAGRAM
February 2, 2012
FN7815.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2011, 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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