1 caution: these devices are sensitive to electrostatic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | copyright intersil americas inc. 2011. all rights reserved intersil (and design) is a trademark owned by intersil corporation or one of its subsidiaries. all other trademarks mentioned are the property of their respective owners. low power, <100 lux optimized, analog output ambient light sensor ISL76671 the ISL76671 is a low cost, light-to-voltage silicon optical sensor combining a photodiode array, a non-linear current amplifier and a micro-power op amp on a single monolithic ic. similar to the human eye, the photodiode array has peak sensitivity at 550nm and spans the wavelength range 400nm to 600nm, rejecting uv and ir light. the input luminance range is from 0.01 lux to 100 lux. the integrated non-linear curren t amplifier boosts and converts the photodiode signal into a squa re root output format, extending dynamic range while maintaining excellent sensitivity in dimly lit conditions. as such, the part is ideal for measuring incident daylight when mounted behind heavily smoked bezels used around displays or behind mirrors. the device consumes minimum power. a dark current compensation circuit minimizes the effect of temperature dependent leakage currents in the absence of light, improving the light sensitivity at low lux levels. the output gain has been optimized to require a relatively low value external bias resistor that falls within recommended automotive emi limits. the built-in 1a op amp gives the ISL76671 an output voltage driving advantage for heavier loads that can drive an adc directly. the ISL76671 is housed in an ultra compact 2mmx2.1mm odfn plastic surface mount package. op eration is rated from -40c to +105c, grade 2 per aecq100. features ? square root voltage output ? 0.01 lux to 100 lux range ? 1.8v to 3v supply range ? close to human eye spectral response ? fast response time ? internal temperature compensation ? good ir rejection ? low supply current ? operating temperature range -40c to +105c ? 6 lead odfn: 2mmx2.1mmx0.7mm ? pb-free (rohs compliant) ? aecq100 qualified applications ? display backlight control - central info display & instrumentation ? anti-glare mirror systems - spec ified to operate behind bezel mounting vdd gnd rext vout 1 2 4 6 light data process current amplifier output current a light intensity photodiode array + - figure 1. simplified block diagram december 12, 2011 fn7716.1
ISL76671 2 fn7716.1 december 12, 2011 pin configuration ISL76671 (6 ld odfn) top view 1 2 3 6 5 4 vdd gnd nc vout nc rext pad pin descriptions pin number pin name pin description 1 vdd voltage supply (1.8v to 3v). 2gndground 3, 5 nc no connect 4 rext connected to an external resistor to gnd, setting the light-to-voltage scaling constant. a r ext value of 100k ? is recommended. 6 vout voltage output. - pad thermal pad. the thermal pad can be co nnected to gnd or electrically isolated. ordering information part number (notes 1, 2, 3) package (pb-free) pkg. dwg. # ISL76671aroz-t7 6 ld odfn (tape and reel) l6.2x2.1 notes: 1. please refer to tb347 for details on reel specifications. 2. these intersil pb-free plastic packaged products employ spec ial 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 sold ering operations. intersil pb-fr ee products are msl classified at pb-free peak reflow temp eratures that meet or exceed the pb-fr ee requirements of ipc/jedec j std-020. 3. for moisture sensitivity level (msl), please see device information page for ISL76671 . for more information on msl please see techbrief tb477 .
ISL76671 3 fn7716.1 december 12, 2011 absolute maximum ratings (t a = +25 c) thermal information supply voltage between v dd and gnd . . . . . . . . . . . . . . . . . . . . . . . . . .3.6v r ext . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (-0.5v + gnd) to (0.5v + v dd ) v out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (-0.5v + gnd) to (0.5v + v dd ) v out short circuit current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <10ma esd rating human body model (tested per jesd22-a114e) . . . . . . . . . . . . . . . . 3kv machine model (tested per jesd22-a115c) . . . . . . . . . . . . . . . . . . 300v charged device model (tested per jesd22-c101e). . . . . . . . . . . . . . 1kv latch up (tested per jesd78c) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100ma thermal resistance (typical) ja (c/w) jc (c/w) 6 ld odfn (notes 4, 5) . . . . . . . . . . . . . . . . 88 7.94 maximum die temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+105c storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40c to +105c operating temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40c to +105c pb-free reflow profile (*) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see tb477 *peak temperature during solder reflow +260c max caution: do not operate at or near the maximum ratings listed for extended periods of time. exposure to such conditions may adv ersely impact product reliability and result in failures not covered by warranty. notes: 4. ja is measured in free air with the componen t mounted on a high effective thermal conduc tivity test board with ?direct attach? fe atures. see tech brief tb379 . 5. for jc , the ?case temp? location is the center of the exposed metal pad on the package underside. electrical specifications unless otherwise noted, all parameter limits are established over the recommended operating conditions: v dd = 3v, t a = -40c to +105c, r ext = 100k ? , no load at vout, and green led light. (typical values are at t a = +25c). boldface limits apply over the operating temperature range, -40c to +105c. parameter description condition min (note 6) typ max (note 6) unit e range of input light intensity for square root relationship to be held 0.01 - 100 lux v dd operating supply voltage 1.8 3 v i dd supply current e = 0 lux, -40c to 60c 0.7 2 a e = 0 lux, -40c to 105c 5 a e = 100 lux 23 35 a v out light-to-voltage accuracy e = 10 lux 0.65 v e = 50 lux 1.35 v e = 100 lux 1.4 1.85 2.3 v v dark voltage output in the absence of light e = 0 lux, -40c to 60c 0.95 20 mv e = 0 lux, -40c to 105c 120 mv v out output voltage variation over three light sources: fluorescent, incandescent and halogen 10 % psrr power supply rejection ratio e = 100 lux 0.12 mv/v v o-cmpl maximum output compliance voltage at 95% of nominal output v dd - 0.7v v v o-max maximum output voltage swing v dd v t r rise time e = 0 lux to 100 lux 95 s t f fall time e = 100 lux to 0 lux 155 s t d delay time for rising edge e = 0 lux to 100 lux 350 s t s delay time for falling edge e = 100 lux to 0 lux 250 s isc short circuit current of op amp 12 ma sr slew rate of op amp 13 v/ms v os offset voltage of op amp 0.9 mv note: 6. parameters with min and/or max limits are 100% tested at +25c, unle ss otherwise specified. temperature li mits established by characterization and are not production tested.
ISL76671 4 fn7716.1 december 12, 2011 figure 2. test circuit for rise/fall ti me measurement figure 3. timing diagram ISL76671 function generator v dd r ext v out power supply or source meter input light output 10% 90% t r t f % 10% 90% t d t s typical performance curves v dd = 3v, t a = +25c, r ext = 100k ? , no load at v out , green led light, unless otherwise specified. figure 4. spectral response figure 5. spectrum of four light sources normalized by luminous intensity (lux) figure 6. radiation pattern figure 7. v dd operating range (white led) -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 300 400 600 800 1.0k wavelength (nm) normalized response light sensor response human eye response 1.1k 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 350 550 750 950 wavelength (nm) normalized intensity fluorescent sun incand. halogen radiation pattern luminosity angle relative sensitivity 90 80 70 60 50 40 30 20 10 0 10 20 30 40 50 60 70 80 90 0.2 0.4 0.6 0.8 1.0 3.25 3.05 2.85 2.65 2.45 2.25 2.05 1.85 1.65 1.45 1.25 0.0001 0.001 0.01 0.1 1 10 100 1000 0.00001 v dd (v) lux low lux limit vout + 0.7v
ISL76671 5 fn7716.1 december 12, 2011 figure 8. output voltage vs light intensity 0.1 lux to 100 lux figure 9. output voltage vs light intensity 0.01 lux to 5lux figure 10. output voltage vs temperature at 0 lux figure 11. supply current vs temperature at 0 lux figure 12. normalized output voltage vs supply vo ltage figure 13. supply current vs supply voltage typical performance curves v dd = 3v, t a = +25c, r ext = 100k ? , no load at v out , green led light, unless otherwise specified. 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0.01 0.1 1 10 100 1000 light intensity (lux) output voltage (v) 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.001 0.01 0.1 1.0 10 light intensity (lux) output voltage (v) 0 20 40 60 80 100 120 -60 -40 -20 0 20 40 60 80 100 120 temperature ( c ) output voltage (mv) 0 0.5 1.0 1.5 2.0 2.5 3.0 -60 -40 -20 0 20 40 60 80 100 120 temperature ( c ) supply current (a) 0.993 0.995 0.997 0.999 1.001 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 supply voltage (v) normalized output voltage 50 lux 50 lux 10 lux 7.68 7.70 7.72 7.74 7.76 7.78 7.80 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 supply voltage (v) supply current (a) 10 lux
ISL76671 6 fn7716.1 december 12, 2011 figure 14. supply current vs supply voltage figure 15. supply current vs supply voltage figure 16. normalized output voltage vs temper ature figure 17. supply current vs temperature figure 18. delay time vs lux change from 0 lux figure 19. delay time vs lux change to 0 lux typical performance curves v dd = 3v, t a = +25c, r ext = 100k ? , no load at v out , green led light, unless otherwise specified. 16.65 16.70 16.75 16.80 16.85 16.90 16.95 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 supply voltage (v) supply current (a) 50 lux 23.20 23.25 23.30 23.35 23.40 23.45 23.50 2.22.42.62.83.0 supply voltage (v) supply current (a) 100 lux 3.2 0.85 0.90 0.95 1.00 1.05 1.10 -60 -40 -20 0 20 40 60 80 100 120 temperature ( c ) normalized output voltage 50 lux 50 lux 10 lux 50 lux 100 lux 0 5 10 15 20 25 30 -60 -40 -20 0 20 40 60 80 100 120 temperature (c) supply current (a) 50 lux 50 lux 10 lux 100 lux light source ISL76671 output (v) 100s/div frequency = 100hz light source ISL76671 output (v) 100s/div frequency = 100hz
ISL76671 7 fn7716.1 december 12, 2011 application information light-to-voltage conversion the ISL76671 has responsiveness th at is a square-root function of the light intensity intercepted by the photodiode in lux. because the photodiode has a re sponsivity that resembles the human eye, conversion rate is independent of the light source (fluorescent light, incandescent light or direct sunlight). in equation 1, v out is the output voltage, e is the light intensity and r ext is the value of the external resistor. the r ext is used to set the light-to-voltage scaling co nstant. the compliance of the ISL76671's output circuit may re sult in premature saturation when an excessively large r ext is used. a r ext value of 1 00k ? is recommended for automotive applications. the output compliance voltage is 700mv below the supply voltage as listed in v o-max of the ?electrical specifications? table on page 3. optical sensor location outline the green area in figure 20 shows the optical sensor location outline of ISL76671. along the pinout direction, the center line (cl) of the sensor coincides with that of the packaging. the sensor width in this direction is 0.39mm. perpendicular to the pinout direction, the cl of the sensor has an 0.19mm offset from the cl of packaging away from pi n 1. the sensor width in this direction is 0.46mm. v out 18 a 100lux ---------------------- - er ext = (eq. 1) figure 20. 6 ld odfn sensor location outline 2.10mm 2.00mm 0.39mm 0.46mm 0.19mm sensor offset
ISL76671 8 intersil products are manufactured, assembled and tested utilizing iso9000 quality systems as noted in the quality certifications found at www.intersil.com/design/quality intersil products are sold by description only. intersil corporat ion reserves the right to make changes in circuit design, soft ware 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 responsi bility is assumed by intersil or its subsid iaries for its use; nor for any infringem ents 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 i ntersil or its subsidiaries. for information regarding intersil corporation and its products, see www.intersil.com fn7716.1 december 12, 2011 for additional products, see www.intersil.com/product_tree products intersil corporation is a leader in the design and manufacture of high-performance analog semico nductors. the company's product s address some of the industry's fastest growing markets, such as , flat panel displays, cell phones, handheld products, and noteb ooks. intersil's product families address power management and analog sign al processing functions. go to www.intersil.com/products for a complete list of intersil product families. for a complete listing of applications, rela ted documentation and related parts, please see the respective device information p age on intersil.com: ISL76671 to report errors or suggestions for this datasheet, please go to: www.intersil.com/askourstaff fits are available from our website at: http://rel.intersil.com/reports/sear revision history the revision history provided is for informational purposes only and is believed to be accurate, but not warranted. please go t o web to make sure you have the latest revision. date revision change december 12, 2011 fn7716.1 ?thermal information? on page 3, changed from: pb-free reflow profile (*) ...... see tb487 *peak temperature during solder reflow +235c max to pb-free reflow profile (*) ...... see tb477 *peak temperature during solder reflow +260c max ?electrical specifications? on page 3: added min value of 1.4v and max value of 2.3v for v out where e = 100 lux october 19, 2011 fn7716.0 initial release
ISL76671 9 fn7716.1 december 12, 2011 package outline drawing l6.2x2.1 6 lead optical dual flat no-lead plastic package (odfn) rev 3, 5/11 located within the zone indicated. the pin #1 identifier may be unless otherwise specified, tolerance : decimal 0.05 tiebar shown (if present) is a non-functional feature. the configuration of the pin #1 id entifier is optional, but must be between 0.15mm and 0.30mm from the terminal tip. dimension applies to the metallized terminal and is measured dimensions in ( ) for reference only. dimensioning and tolerancing conform to asme y14.5m-1994. 6. either a mold or mark feature. 3. 5. 4. 2. dimensions are in millimeters. 1. notes: bottom view detail "x" side view typical recommended land pattern top view (4x) 0.10 index area pin 1 a b pin #1 b 0.10 ma c c seating plane base plane 0.08 0.10 see detail "x" c c 0 . 00 min. 0 . 05 max. 0 . 2 ref c 5 1 6 6 2.10 2.00 2.10 2.50 (1.35) (6x0.30) 0.65 (6x0.55) (6x0.20) (4x0.65) 1.30 ref 1.35 0.65 0.65 6x0.35 0.05 package 6x 0.300.05 index area outline 4 max 0.75
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