ISL29027
Proximity Sensor with Intelligent Interrupt and Sleep Modes

Key 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

Description

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