ISL29027

Proximity Sensor with Intelligent Interrupt and Sleep Modes

OVERVIEW

The ISL29027 is an integrated infrared light-to-digital converter with a built-in IR LED driver and I2 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 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.

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

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL29027
Basic Information
Production Status
Mass Production
Peak Spectral Sensitivity
830 nm
VS (min)
2.25 V
VS (max)
3.63 V
ICC
110
Resolution Bits
8
Gain Selection?
No
Qualification Level
Standard
Bus/Output Interface
I2C
Address Selection Pins?
Yes
Package Dimensions (mm)
2.0x2.1x0.7
Enable Pin?
No
Can Sample
YES
Temperature Range
-40 to +85

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