- Ideal for applications under dark or tinted glass
- Enhanced ambient sunlight rejection to 40k Lux
- Programmable proximity sleep time between proximity measurements optimizes power consumption
- Hardware interrupt - no polling required
- Programmable IR compensation to fine tune ALS performance for various glass compositions
- Up to 4000 Lux, four selectable ALS ranges
- Programmable IR LED drive current to 250mA
- Operates from 2.25V to 3.63V VDD
- Power-down IDD, typical 0.2µADC
- Tiny 2.1x2.0x0.7 (mm) ODFN package
The ISL29038 is a low power Ambient Light Sensor (ALS) and proximity (PROX) sensor. It has a built-in IR-LED driver for proximity function. The ALS function measures the amount of light (in the visible spectrum) incident on the ISL29038.
The ALS function has a programmable ambient IR-rejection, which allows fine tuning of light source variations and is ideal for light sensor applications under dark protective glass. The ALS provides a 12-bit measurement. A passive optical filter removes unwanted wavelengths (IR or Ultraviolet) to ensure accurate ALS measurement.
The proximity function includes a new offset adjustment to compensate for the IR light reflected off the inside of the protective glass cover and back to the ISL29038 sensor. This offset adjustment allows the sensor to compensate for these internal reflections and preserve the dynamic range of the proximity measurement.
The built-in current-driver pulses an external infrared LED at a programmed current for 90µs. The infrared light that is reflected and received by ISL29038 is digitized by an 8-bit ADC. The proximity sensor also has a passive optical filter designed to pass IR and reject visible wavelengths.
The ISL29038 provides a hardware pin to indicate an interrupt event. The interrupt pin saves power as the host microcontroller can ‘wake-up’ on an interrupt event and does not need to poll the device for an interrupt event. The interrupt generator is user configurable and provides several options for ALS and PROX trigger configurations. The ISL29038 supports an SMBus compatible I2C interface for configuration and control.
- Display dimming and adjustment
- Mobile devices: smart phones, PDA, GPS
- Computing: monitors, laptops, notebooks
- Picture frames, tablet_PCs, LCD_TV
- Object detection
- Touchscreen disabling
- Smart power-saving
|Peak Spectral Sensitivity||545 nm||830 nm||550 nm||640 nm, 530 nm, 470 nm|
|VS (min)||2.25 V||2.25 V||2.25 V||2.25 V|
|VS (max)||3.63 V||3.63 V||3.63 V||3.63 V|
|Supply Current (μA)||125||110||94µA||56|
|Resolution (Bits)||12||8||12||4, 8, 12, 16|
|Lux Range (min)||0 lux||0 lux||5.7m lux|
|Lux Range (max)||4000 lux||N/A lux||2000 lux||10000 lux|
|Counts/Lux (max) (Counts)||1.024||N/A||2.048|
|Dark ADC Code @ Ev=0Lux (max) (Counts)||1||N/A||3||5|
|Address Selection Pins?||No||Yes||No||No|
|Package Dimensions (mm)||2.1x2.0x0.7||2.0x2.1x0.7||2.36x3.94x1.35||1.65x1.65x0.7|
|Features||Enhanced IR Rejection||Internal LED + Sensor||Digital Output, Low Power, Red, Green, and Blue Color Light Sensor|
|Enable Pin?||No||No||Software Enabled||No|
|ISL29xxx Evaluation Boards User Guide|
Evaluation Hardware/Software Manual for ALS and Proximity Sensor
06 Mar 2018
|06 Mar 2018||1.66 MB|
|AN1682: What are the Advantages of Packaging a Proximity Sensor with an Ambient Light Sensor|
What are the Advantages of Packaging a Proximity Sensor with an Ambient Light Sensor?
26 Jan 2018
|26 Jan 2018||280 KB|
|AN1737: Eye Safety for Proximity Sensing Using Infrared Light-Emitting Diodes|
Eye Safety for Proximity Sensing Using Infrared Light-Emitting Diodes
23 Jan 2018
|23 Jan 2018||669 KB|
Low Power Ambient Light and Proximity Sensor with Enhanced Infrared Rejection
10 Nov 2017
|10 Nov 2017||724 KB|
|Intersil ISL29xxx HID Installer v1.39|
Intersil ISL29xxx HID Installer v1.39
|ISL29038 Qualcomm Driver|
The ISL29038 driver is restricted for use by Qualcomm only.
10 Apr 2017
|ZIP||10 Apr 2017||41 KB|