ISL29015
Integrated Digital Ambient Light Sensor and Proximity Sensor

Key Features

• 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 up to 16-bits
  
  
• 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
• 1.0µA Max Shutdown Current
• Software Shutdown and Automatic Shutdown
  
  
• Easy to Use
• I²C (SMBus Compatible) Output
• No Complex Algorithms Needed
• Temperature Compensated
• Small Form Factor
• 2.0x2.1x0.7mm 6 Ld ODFN Package
  
  
• Additional Features
• I²C and SMBus Compatible
• 1.7V to 3.63V Supply for I²C Interface
• 2.25V to 3.3V Supply
• Pb-Free (RoHS compliant)

Description

The ISL29015 is an integrated ambient and infrared light to digital converter with a built-in IR LED driver and I²C/SMBus interface. This device provides not only ambient light sensing to allow robust backlight/display brightness control but also infrared sensing to allow proximity estimation. For ambient light sensing, an internal 16-bit ADC has been designed based on the charge-balancing A/D conversion technique. The ADC conversion time is nominally 100ms and is user adjustable from 25µs to 100ms depends 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 I²C 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 1µA. Designed to operate on supplies from 2.25V to 3.3V, the ISL29015 is specified for operation over the -40°C to +85°C ambient temperature range. It is packaged in a clear, Pb-free 6 Ld ODFN package.

Applications

• Display and Keypad Dimming Adjustment and Proximity Sensing for:
• Mobile Devices: Smart Phone, PDA, GPS
• Computing Devices: Notebook PC, Webpad
• Consumer Devices: LCD-TV, Digital Picture Frame, Digital Camera
• Industrial and Medical Light and Proximity Sensing