ISL29012

® ISL29012 Data Sheet December 10, 2008 FN6476.1 Light-to-Digital Output Sensor with High Sensitivity, Gain Selection, Interrupt Function and I2C Bus™ The ISL29012 is an integrated light sensor with I2C (SMBus Compatible) interface. It has an internal signed 15-bit integrating type ADC designed based on the charge-balancing A/D conversion technique. This ADC is capable of rejecting 50Hz and 60Hz flicker caused by artificial light sources. The lux range select feature allows the user to program the lux range for optimized counts/lux. In normal operation, power consumption is typically 250µA. Furthermore, a power-down mode can be controlled by software via the I2C interface, reducing power consumption to less than 1µA. The ISL29012 supports a hardware interrupt that remains asserted low until the host clears it through I2C interface. Designed to operate on supplies from 2.5V to 3.3V, the ISL29012 is specified for operation over the -40°C to +85°C ambient temperature range. Features • Range Select Via I2C - Range 1 = 0.5 lux to 2,000 lux - Range 2 = 0.5 lux to 8,000 lux - Range 3 = 0.5 lux to 32,000 lux - Range 4 = 0.5 lux to 128,000 lux • Human Eye Response (540nm Peak Sensitivity) • Temperature Compensated • Signed 15-bit Resolution • Adjustable Resolution: Up to 20 Counts per lux • User-programmable Upper and Lower Threshold Interrupt • Simple Output Code, Directly Proportional to lux • IR + UV Rejection • 50Hz/60Hz Rejection • 2.5V to 3.3V Supply • 6 Ld ODFN (2.1mmx2mm) • Pb-Free (RoHS compliant) Ordering Information PART NUMBER (Note) ISL29012IROZ-T7* ISL29012IROZ-EVALZ TEMP. RANGE (°C) -40 to +85 PACKAGE (Pb-Free) 6 Ld ODFN PKG. DWG. # L6.2x2.1 • Operating Temperature Range: -40°C to +85°C • I2C and SMBus Compatible Applications • Display and Keypad Backlight Dimming - Mobile Devices: Smart phone, PDA, and GPS - Computing Devices: Notebook PC, UMPC Web Pod - Consumer Devices: LCD-TV, Digital Picture Frame and Digital Cameras • Industrial and Medical Light Sensing Evaluation Board *Please refer to TB347 for details on reel specifications. NOTE: 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. Pinout Block Diagram VDD 1 GAIN/RANGE INT TIME SHDN VDD 1 COMMAND REGISTER DATA REGISTER I2C 5 SCL 6 SDA GND 2 REXT 3 ISL29012 (6 LD ODFN) TOP VIEW 6 SDA 5 SCL 4 INT LIGHT DATA PROCESS PHOTODIODE ARRAY IREF FOSC INTEGRATING ADC EXT TIMING INT 216 COUNTER *EXPOSED PAD CAN BE CONNECTED TO GND OR ELECTRICALLY ISOLATED INTERRUPT 4 INT 3 REXT 2 GND ISL29012 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. I2C Bus is a registered trademark owned by NXP Semiconductors Netherlands, B.V Copyright © Intersil Americas Inc. 2008. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. ISL29012 Absolute Maximum Ratings (TA = +25°C) VDD Supply Voltage between VDD and GND . . . . . . . . . . . . . 3.6V I2C Bus (SCL, SDA) and INT Pin Voltage . . . . . . . . . . -0.2V to 5.5V I2C Bus (SCL, SDA) Pin Current . . . . . . . . . . . . . . . . . . . . . 1.5mm LIGHT PIPE t D2 DLENS L ISL29012 FIGURE 5. WINDOW WITH LIGHT GUIDE/PIPE Suggested PCB Footprint It is important that the users check the “Surface Mount Assembly Guidelines for Optical Dual FlatPack No Lead (ODFN) Package” before starting ODFN product board mounting. http://www.intersil.com/data/tb/TB477.pdf Typical Circuit A typical application for the ISL29012 is shown in Figure 6. The ISL29012’s I2C address is internally hardwired as 1000100. The device can be tied onto a system’s I2C bus together with other I2C compliant devices. Soldering Considerations Convection heating is recommended for reflow soldering; direct-infrared heating is not recommended. The plastic ODFN package does not require a custom reflow soldering profile, and is qualified to +260°C. A standard reflow soldering profile with a +260°C maximum is recommended. Layout Considerations The ISL29012 is relatively insensitive to layout. Like other I2C devices, it is intended to provide excellent performance even in significantly noisy environments. There are only a few considerations that will ensure best performance. Route the supply and I2C traces as far as possible from all sources of noise. Use one 0.01µF power-supply decoupling capacitor, placed close to the device. 10 FN6476.1 December 10, 2008 ISL29012 2.5V TO 5.5V R1 10k R2 10k R3 RES1 I2C MASTER MICROCONTROLLER SDA SCL INT 2.5V TO 3.3V I2C SLAVE_0 1 2 C1 0.01µF 3 REXT 100k VDD GND REXT SDA SCL INT 6 5 4 I2C SLAVE_1 SDA SCL I2C SLAVE_n SDA SCL ISL29012 FIGURE 6. ISL29012 TYPICAL CIRCUIT Typical Performance Curves (REXT = 100kΩ) 1.2 HUMAN EYE RESPONSE NORMALIZED RESPONSE 1.0 20° 0.8 0.6 0.4 0.2 0.0 -0.2 ISL29012 RESPONSE 60° 70° 80° 90° 300 400 600 800 WAVELENGTH (nm) 1.0k 1.1k 0.2 0.4 0.6 0.8 RELATIVE SENSITIVITY LUMINOSITY 30° ANGLE 40° 50° RADIATION PATTERN 10° 0° 10° 20° 30° 40° 50° 60° 70° 80° 90° 1.0 FIGURE 7. SPECTRAL RESPONSE FIGURE 8. RADIATION PATTERN 1.2 NORMALIZED LIGHT INTENSITY 1.0 SUN 0.8 HALOGEN 0.6 0.4 0.2 0 300 INCANDESCENT FLUORESCENT SUPPLY CURRENT (µA) 320 TA = +27°C 306 5000 lux 292 278 200 lux 264 400 500 600 700 800 900 1000 1100 250 2.0 2.3 2.6 2.9 3.2 3.5 3.8 WAVELENGTH (nm) SUPPLY VOLTAGE (V) FIGURE 9. SPECTRUM OF LIGHT SOURCES FOR MEASUREMENT FIGURE 10. SUPPLY CURRENT vs SUPPLY VOLTAGE 11 FN6476.1 December 10, 2008 ISL29012 Typical Performance Curves (REXT = 100kΩ) 10 TA = +27°C 0 lux OUTPUT CODE RATIO (% FROM 3V) 8 (Continued) 1.015 TA = +27°C 1.010 5000 lux 1.005 OUTPUT CODE (COUNTS) 6 4 RANGE 2 2 1.000 200 lux 0.995 0 2.0 2.3 2.6 2.9 3.2 3.5 3.8 0.990 2.0 2.3 2.6 2.9 3.2 3.5 3.8 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) FIGURE 11. OUTPUT CODE FOR 0 LUX vs SUPPLY VOLTAGE FIGURE 12. OUTPUT CODE vs SUPPLY VOLTAGE 320.0 OSCILLATOR FREQUENCY (kHz) TA = +27°C 319.5 SUPPLY CURRENT (mA) 315 VDD = 3V 305 5000 lux RANGE 3 295 319.0 285 200 lux RANGE 1 275 318.5 318.0 2.0 2.3 2.6 2.9 3.2 3.5 3.8 265 -60 -20 20 TEMPERATURE (°C) 60 100 SUPPLY VOLTAGE (V) FIGURE 13. OSCILLATOR FREQUENCY vs SUPPLY VOLTAGE FIGURE 14. SUPPLY CURRENT vs TEMPERATURE 10 VDD = 3V OUTPUT CODE (COUNTS) OUTPUT CODE RATIO (% FROM +25°C) 8 0 lux 1.080 VDD = 3V 1.048 5000 lux RANGE3 1.016 200 lux RANGE1 6 4 RANGE 2 0.984 2 0.952 0 -60 -20 20 TEMPERATURE (°C) 60 0.920 -60 -20 20 TEMPERATURE (°C) 60 100 FIGURE 15. OUTPUT CODE FOR 0 LUX vs TEMPERATURE FIGURE 16. OUTPUT CODE vs TEMPERATURE 12 FN6476.1 December 10, 2008 ISL29012 Typical Performance Curves (REXT = 100kΩ) 330 OSCILLATOR FREQUENCY (kHz) VDD = 3V 329 ADC READING (COUNTS) 10k ALS RANGE 4 8k 6k 4k 2k 0 100 0 20k 40k 60k 80k 100k 120k LUX METER READING (LUX), SUN LIGHT (Continued) 12k ALS RANGE 3 328 327 326 325 -60 -20 20 TEMPERATURE (°C) 60 FIGURE 17. OSCILLATOR FREQUENCY vs TEMPERATURE FIGURE 18. SATURATION CHARACTERISTICS 1000 CALCULATED ALS READING (LUX) 900 800 700 600 500 400 300 200 100 0 0 CALCULATED ALS READING (LUX) VDD = 3V HALOGEN 100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100 LUX METER READING (LUX) INCANDESCENT FLUORESCENT VDD = 3V HALOGEN INCANDESCENT FLUORESCENT 100 200 300 400 500 600 700 800 900 1k LUX METER READING (LUX) FIGURE 19. LIGHT SENSITIVITY vs LUX LEVEL FIGURE 20. LIGHT SENSITIVITY vs LUX LEVEL 1.2 HUMAN EYE RESPONSE NORMALIZED RESPONSE 1.0 0.8 0.6 0.4 0.2 0 -0.2 300 400 500 600 700 800 900 1000 1100 WAVELENGTH (nm) INTERNAL D1 INTERNAL D2 ALS OUTPUT (D1 - D2) 18000 16000 14000 12000 10000 8000 6000 HALOGEN 4000 2000 0 00 30 00 28 00 26 00 24 00 22 00 20 00 18 00 16 00 14 00 12 00 10 0 80 0 60 0 40 0 20 0 FLUORESCENT SUNLIGHT INCANDESCENT LUX METER READING (LUX) FIGURE 21. SPECTRAL RESPONSE INTERNAL DIODES FIGURE 22. ALS OUTPUT vs LUX LEVEL @ RANGE = 1, REXT = 50kΩ 13 FN6476.1 December 10, 2008 ISL29012 2.10mm VDD 1 6 SDA 2.00mm 0.29mm GND 2 5 SCK 0.56mm REXT 3 4 INT 0.43mm FIGURE 23. 6 LD ODFN SENSOR LOCATION OUTLINE All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 14 FN6476.1 December 10, 2008 ISL29012 Package Outline Drawing L6.2x2.1 6 LEAD OPTICAL DUAL FLAT NO-LEAD PLASTIC PACKAGE (ODFN) Rev 0, 9/06 2.10 A 6 PIN 1 INDEX AREA B 1 6 PIN 1 INDEX AREA 0.65 2.00 1 . 35 1 . 30 REF (4X) 0.10 6X 0 . 30 ± 0 . 05 0 . 65 TOP VIEW 0.10 M C A B 6X 0 . 35 ± 0 . 05 BOTTOM VIEW (0 . 65) MAX 0.75 SEE DETAIL "X" 0.10 C (0 . 65) (1 . 35) BASE PLANE ( 6X 0 . 30 ) SIDE VIEW SEATING PLANE 0.08 C C ( 6X 0 . 55 ) C (1 . 95) 0 . 00 MIN. 0 . 05 MAX. DETAIL "X" 0 . 2 REF 5 TYPICAL RECOMMENDED LAND PATTERN NOTES: 1. Dimensions are in millimeters. Dimensions in ( ) for Reference Only. 2. Dimensioning and tolerancing conform to AMSE Y14.5m-1994. 3. Unless otherwise specified, tolerance : Decimal ± 0.05 4. Dimension b applies to the metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip. 5. Tiebar shown (if present) is a non-functional feature. 6. The configuration of the pin #1 identifier is optional, but must be located within the zone indicated. The pin #1 identifier may be either a mold or mark feature. 15 FN6476.1 December 10, 2008