ISL29027_14 Datasheet, PDF (1/13 Pages) Intersil Corporation – Proximity Sensor with Intelligent Interrupt and Sleep Modes

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 I²C 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 540μs conversion time.
The ISL29027 provides proximity sensing with a typical 138μA
normal operation current (110μA for sensors and internal circuitry,
~28μA for external LED) with 220mA current pulses for a net 100μs,
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 μC Code
Proximity Sensing
• Proximity Sensor with Broad IR Spectrum
- Can Use 850nm and 950nm External IR LEDs
• IR LED Driver with I²C Programmable Sink Currents
- Net 100μs 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
• 138μA DC Typical Supply Current for Prox Sensing
- 110μA for Sensors and Internal Circuitry
- 28μA Typical Current for External IR LED (Assuming 220mA
for 100μs Every 800ms)
• <1.0μA Supply Current When Powered Down
Easy to Use
• Set Registers; Wait for Interrupt
• I²C (SMBus Compatible) Output
• Temperature Compensated
• Tiny ODFN8 2.0x2.1x0.7 (mm) Package
Additional Features
• 1.7V to 3.63V Supply for I²C Interface
• 2.25V to 3.63V Sensor Power Supply
• Pb-Free (RoHS Compliant)
• I²C Address Selection Pin
2
February 2, 2012
FN7815.1
LIGHT DATA
PROCESS
IR
IR PHOTODIODE
ARRAY
IREF
FOSC
CHANNEL
ADC
COMMAND
REGISTER
DATA
REGISTER
I²C
INTERRUPT
1 ADDR0
5 SCL
6 SDA
7 INT
IR DRIVER
8 IRDR
4
REXT
1
3
GND
FIGURE 1. BLOCK DIAGRAM
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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