ISL29011

ISL29011 Data Sheet May 5, 2011 FN6467.4 Digital Ambient Light Sensor and Proximity Sensor with Interrupt Function The ISL29011 is an integrated ambient and infrared light to digital converter with a built-in IR LED driver and I2C 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 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 0.5µA. The ISL29011 supports both hardware and software interrupts that remain asserted until the host clears it through I2C interface for ambient light sensing and proximity detection. Designed to operate on supplies from 2.25V to 3.63V, the ISL29011 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. 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 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) 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 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2009-2011. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. ISL29011 Ordering Information PART NUMBER (Notes 1, 2, 3) ISL29011IROZ-T7 ISL29011IROZ-EVALZ NOTES: 1. Please 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), please see device information page for ISL29011. For more information on MSL please see techbrief TB363. TEMP. RANGE (°C) -40 to +85 Evaluation Board PACKAGE Tape and Reel (Pb-Free) 8 Ld ODFN PKG. DWG. # L8.2.1x2.0 Pinout ISL29011 (8 LD ODFN) TOP VIEW) VDDD 1 VDDA 2 GND 3 REXT 4 8 IRDR 7 INT 6 SDA 5 SCL EXPOSED PAD CAN BE CONNECTED TO GND OR ELECTRICALLY ISOLATED Pin Descriptions PIN NUMBER PIN NAME 1 2 3 4 5 6 7 8 VDDD VDDA GND REXT SCL SDA INT IRDR Positive digital supply: 2.25V to 3.63V. Positive analog supply: 2.25V to 3.63V, VDDA and VDDD should be externally shorted. Ground. The thermal pad is also connected to the GND pin. External resistor pin setting the internal reference current and the conversion time. 499kΩ with 1% tolerance resistor is recommended. I2C serial clock line I2C serial data line Interrupt pin; LO for interrupt/alarming. The INT pin is an open drain. IR LED driver pin connecting to the anode of the external IR LED. The source current of the IR LED driver can be programmed through I2C. Exposed pad connected to ground or electrically isolated. The I2C bus lines can be pulled from 1.7V to above VDD, 3.63V max. DESCRIPTION 2 FN6467.4 May 5, 2011 ISL29011 Block Diagram VDDA 2 PHOTODIODE ARRAY COMMAND REGISTER LIGHT DATA PROCESS ALS AND IR IR PHOTODIODE ARRAY IREF INTERRUPT FOSC IR DRIVER 4 REXT 3 GND ISL29011 7 INT INTEGRATION ADC DATA REGISTER 6 I2C 5 SDA SCL VDDD 1 8 IRDR 3 FN6467.4 May 5, 2011 ISL29011 Absolute Maximum Ratings (TA = +25°C) VSUP(VDDD,VDDA) Supply Voltage between VDD and GND . . . . . .4V VDDA Supply Voltage between VDDA and GND . . . . . VDDD ± 0.5V I2C Bus (SCL, SDA) and INT Pin Voltage . . . . . . . . . . . . -0.2V to 4V I2C Bus (SCL, SDA) and INT Pin Current . . . . . . . . . . . . . . .