DATASHEET ISL29038 FN7851 Rev 1.00 Low Power Ambient Light and Proximity Sensor with Enhanced Infrared Rejection January 23, 2015 The ISL29038 is a low power Ambient Light Sensor (ALS) and Features proximity (PROX) sensor. It has a built-in IR-LED driver for Ideal for applications under dark or tinted glass proximity function. The ALS function measures the amount of light (in the visible spectrum) incident on the ISL29038. Enhanced ambient sunlight rejection to 40k Lux The ALS function has a programmable ambient IR-rejection, Programmable proximity sleep time between proximity which allows fine tuning of light source variations and is ideal measurements optimizes power consumption for light sensor applications under dark protective glass. The Hardware interrupt - no polling required ALS provides a 12-bit measurement. A passive optical filter Programmable IR compensation to fine tune ALS removes unwanted wavelengths (IR or Ultraviolet) to ensure performance for various glass compositions accurate ALS measurement. Up to 4000 Lux, four selectable ALS ranges The proximity function includes a new offset adjustment to Programmable IR LED drive current to 250mA compensate for the IR light reflected off the inside of the protective glass cover and back to the ISL29038 sensor. This Operates from 2.25V to 3.63V V DD offset adjustment allows the sensor to compensate for these Power-down I typical 0.2A DD, DC internal reflections and preserve the dynamic range of the proximity measurement. Tiny 2.1x2.0x0.7 (mm) ODFN package The built-in current-driver pulses an external infrared LED at a Applications programmed current for 90s. The infrared light that is reflected and received by ISL29038 is digitized by an 8-bit Display dimming and adjustment ADC. The proximity sensor also has a passive optical filter - Mobile devices: smart phones, PDA, GPS designed to pass IR and reject visible wavelengths. - Computing: monitors, laptops, notebooks The ISL29038 provides a hardware pin to indicate an interrupt -Picture frames, tablet PCs, LCD TV event. The interrupt pin saves power as the host microcontroller Object detection can wake-up on an interrupt event and does not need to poll the device for an interrupt event. The interrupt generator is - Touchscreen disabling user configurable and provides several options for ALS and -Smart power-saving PROX trigger configurations. The ISL29038 supports an 2 SMBus compatible I C interface for configuration and control. 100 90 VDD PULLUP 80 VDD IRLED 250mA SCL, SDA AND D IRLED 1 70 R C INT PULL UPs 2 1 100 U1 1F SMBus MASTER 125mA 1 8 60 GNDIR IRDR 2 7 VDD ANALOG AVDD INT INT 50 3 6 AGND SDA SDA C 2 4 5 62.5mA SCL REXT SCL 40 1F ISL29038 R 1 30 499k 31.25mA R : 499k 1% RESISTOR 20 1 R : 100 5% RESISTOR 2 10 C , C : 1F CERAMIC 10V CAPACITOR 1 2 D : OSRAM SFH4650 INFRARED LED 1 0 020 40 60 80 18% GREY CARD PROXIMITY DISTANCE (mm) FIGURE 1. TYPICAL APPLICATIONS CIRCUIT FIGURE 2. PROXIMITY SENSITIVITY FN7851 Rev 1.00 Page 1 of 15 January 23, 2015 FULL-SCALE RANGE (%) ISL29038 VDD 2 ALS PHOTODIODE ARRAY COMMAND REGISTER PHOTODIODE DUAL CHANNEL AMPLIFIERS DATA ADCs (ALS AND IR) REGISTER 1 GNDIR 2 5 SCL I C IR PHOTODIODE ARRAY 6 SDA IREF INTERRUPT 7 INT FOSC 8 IRDR IR DRIVER 3 4 REXT GND FIGURE 3. ISL29038 BLOCK DIAGRAM Pin Configuration Pin Description ISL29038 PIN NAME DESCRIPTION (8 LD ODFN) TOP VIEW 1 GNDIR Ground for IRDR LED Current. 2 VDD Positive supply: 2.25V to 3.63V. GNDIR 1 8 IRDR 3GND Ground. 4 REXT External Resistor, Connect to GND pin through a VDD 2 7 INT 499k 1% resistor. THERMAL PAD 2 5SCL I C Serial Clock Input. GND 3 6 SDA 2 6SDA I C Serial Data Input/Output. REXT 4 5 SCL 7INT Active Low, Open-Drain Output. 8 IRDR IR-LED Driver Sink - Connect to IR LED Cathode. - TPAD Thermal Pad - Connect to GND. Ordering Information PART NUMBER PART V RANGE TEMP RANGE PKG. DD (Notes 1, 2, 3) MARKING (V) (C) PACKAGE DWG. ISL29038IROZ-T7 N/A 2.25 to 3.63 -40 to +85 8 Lead ODFN L8.2.1x2.0 ISL29038IROZ-EVALZ Evaluation Board NOTES: 1. Refer to TB347 for details on reel specifications. 2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets molding compounds/die attach materials and NiPdAu plate-e4 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), see device information page for ISL29038. For more information on MSL see techbrief TB477. FN7851 Rev 1.00 Page 2 of 15 January 23, 2015