Digital Ambient Light Sensor and Proximity Sensor with Interrupt Function

Device is no longer available or supported, and production has been discontinued.

Replacement Product
Production Status
Mass Production
Product Status: EOL


The ISL29018 is an integrated ambient and infrared light to digital converter with a built-in IR LED driver and I2 C Interface (SMBus Compatible). This device provides not only ambient light sensing to allow robust backlight/display brightness control but also infrared sensing to allow proximity estimation featured with interrupt function.

For ambient light sensing, an internal ADC has been designed based on the charge-balancing A/D conversion technique. The ADC conversion time is nominally 90ms and is user adjustable from 11µs to 90ms, depending on oscillator frequency and ADC resolution. This ADC is capable of rejecting 50Hz and 60Hz flicker noise caused by artificial light sources. The lux-range-select feature allows users to program the lux range for optimized counts/lux.

For proximity sensing, 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.

Six different modes of operation can be selected via the I2 C interface: Programmable ALS once with auto power-down, programmable IR sensing once, programmable proximity sensing once, programmable continuous ALS sensing, 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 ISL29018 supports both hardware and software interrupts that remain asserted until the host clears it through I2 C interface for ambient light sensing and proximity detection.Designed to operate on supplies from 2.25V to 3.63V, the ISL29018 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.


  • 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

  • Ambient Light Sensing
  • Simple Output Code Directly Proportional to lux
  • Adjustable Sensitivity up to 65 Counts per lux
  • Selectable Range (via I2C)
  • Range 1 = 0.015 lux to 1,000 lux
  • Range 2 = 0.06 lux to 4,000 lux
  • Range 3 = 0.24 lux to 16,000 lux
  • Range 4 = 0.96 lux to 64,000 lux
  • Integrated 50/60Hz Noise Rejection
  • Works Under Various Light Sources, Including Sunlight

  • Ideal Spectral Response for Light and Proximity Sensor
  • Light Sensor Close to Human Eye Response
  • Excellent Light Sensor IR and UV Rejection
  • 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)


 Block Diagram


Basic Information
Production Status
Peak Spectral Sensitivity
540 nm
VS (min)
2.25 V
VS (max)
3.63 V
Resolution Bits
Lux Range (max) (lux)
Counts/Lux (max) (Counts)
Dark ADC Code @ Ev=0Lux (max) (Counts)
Gain Selection?
Qualification Level
Bus/Output Interface
Address Selection Pins?
Package Dimensions (mm)
Enable Pin?

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