NOA1211 Ambient Light Sensor with Dark Current Compensation Description The NOA1211 is a very low power ambient light sensor (ALS) with an analog current output and a power down mode to conserve power. Designed primarily for handheld device applications, the active power dissipation of this chip is less than 8 mA at dark and its quiescent current consumption is less than 200 pA in power down mode. The device can operate over a very wide range of voltages from 2 V to 5.5 V. The NOA1211 employs proprietary CMOS image sensing technology from ON Semiconductor, including built-in dynamic dark current compensation to provide large signal to noise ratio (SNR) and wide dynamic range (DR) over the entire operating temperature range. The photopic optical filter provides a light response similar to that of the human eye. Together the photopic light response and dark current compensation insures accurate light level detection. http://onsemi.com CUDFN6 CU SUFFIX CASE 505AE PIN ASSIGNMENT Features * Senses Ambient Light and Provides an Output Current Proportional * * * * * * * * * * * * to the Ambient Light Intensity Photopic Spectral Response Dynamic Dark Current Compensation Two Selectable Output Current Gain Modes Power Down Mode Less than 18 mA at 100 lux Active Power Consumption in Normal Operation (Less than 8 mA at Dark) Less than 200 pA Quiescent Power Dissipation in Power Down Mode at All Light Levels Linear Response Over the Full Operating Range Senses Intensity of Ambient Light from ~0 lux to Over 100,000 lux Wide Operating Voltage Range (2 V to 5.5 V) Wide Operating Temperature Range (-40C to 85C) Drop-in Replacement Device in 1.6 x 1.6 mm Package These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS Compliant Applications Cell Phones, PDAs, MP3 players, GPS Cameras, Video Recorders Mobile Devices with Displays or Backlit Keypads Laptops, Notebooks, Digital Signage LCD TVs and Monitors, Digital Picture Frames Automobile Dashboard Displays and Infotainment LED Indoor/Outdoor Residential and Street Lights (c) Semiconductor Components Industries, LLC, 2011 March, 2011 - Rev. 0 1 6 IOUT VSS 2 5 NC GB1 3 4 GB2 (Top View) ORDERING INFORMATION Device Package Shipping NOA1211CUTAG* CUDFN6 (Pb-Free) 2500 / Tape & Reel For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. *Temperature Range: -40C to 85C. Vin = 2 to 5.5V PDB VDD hn * Saves display power in applications such as: VDD C1 1m GB2 GB2GB1 GB1 Photo Amp Diode ADC IOUT RL VSS CL IC2 NOA1211 IC1 Figure 1. Typical Application Circuit 1 Publication Order Number: NOA1211/D NOA1211 PDB `0' GB2 GB1 Amp VOUT IOUT hn RL Photo Diode Reference Diode Figure 2. Simplified Block Diagram Configured for M-Gain and Power-Down Table 1. PIN FUNCTION DESCRIPTION Pin Pin Name Description 1 VDD Power pin. 2 VSS Ground pin. 3 GB1 In conjunction with GB2, selects between two gain modes and power down. 4 GB2 In conjunction with GB1, selects between two gain modes and power down. 5 NC Not connected. This may be connected to ground or left floating. 6 IOUT Analog current output. EP VSS Exposed pad, internally connected to ground. Should be connected to ground. Table 2. ABSOLUTE MAXIMUM RATINGS Symbol Value Unit Input power supply Rating VDD 6 V Input voltage range VIN -0.3 to VDD + 0.3 V Output voltage range VOUT -0.3 to VDD + 0.2 V Output current range Io 0 to 15 mA TJ(max) -40 to 85 C Maximum Junction Temperature Storage Temperature TSTG -40 to 85 C ESD Capability, Human Body Model (Note 1) ESDHBM 2 kV ESD Capability, Charged Device Model (Note 1) ESDCDM 750 V ESD Capability, Machine Model (Note 1) ESDMM 150 V Moisture Sensitivity Level MSL 5 - Lead Temperature Soldering (Note 2) TSLD 260 C Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. This device incorporates ESD protection and is tested by the following methods: ESD Human Body Model tested per EIA/JESD22-A114 ESD Charged Device Model tested per ESD-STM5.3.1-1999 ESD Machine Model tested per EIA/JESD22-A115 Latchup Current Maximum Rating: v 100 mA per JEDEC standard: JESD78 2. For information, please refer to our Soldering and Mounting Techniques Reference Manual, SOLDERRM/D http://onsemi.com 2 NOA1211 Table 3. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over VDD = 5.5 V, -40C < TA < 85C) Rating Test Conditions Power supply voltage Symbol Min Typ Max Unit VDD 2 3.0 5.5 V IDD_0 6 8 12 mA 13 14 18 mA 0.2 5 nA Power supply current VDD = 3.0 V, Ev = 0 lux, M-Gain Power supply current VDD = 3.0 V, Ev = 100 lux, M-Gain IDD_100 Power down current All light levels IDD_PD Output current, medium-gain Ev = 100 lux, white LED Io_med 2.66 5.2 7.98 mA Output current, low-gain Ev = 100 lux, white LED Io_low 0.266 0.52 0.798 mA Dark output current, medium-gain VDD = 3.0 V, Ev = 0 lux Io_dark 1 nA lm 540 nm Wavelength of maximum response White LED/fluorescent current ratio Ev = 100 lux rLF 1.0 Incandescent/fluorescent current ratio Ev = 100 lux rIF 1.45 Maximum output voltage Ev = 100 lux, RL = 220 kW, M-Gain Power down time Wake up time VOMAX VDD-0.4 Ev = 100 lux, M-Gain to PD tPD 1.5 Ev = 100 lux, PD to M-Gain twu VDD-0.1 VDD V ms 300 ms Low level input voltage VIL -0.2 0.25 VDD V High level input voltage VIH 0.75 VDD VDD + 0.2 V Operating free-air temperature range TA -40 85 C http://onsemi.com 3 NOA1211 TYPICAL CHARACTERISTICS OUTPUT CURRENT (Normalized) 1.0 ALS Human Eye 0.9 0.8 Fluorescent (5000K) 0.7 White LED (5600K) 0.6 0.5 Fluorescent (2700K) 0.4 0.3 0.2 Incandescent (2850K) 0.1 0 200 300 400 500 600 700 800 WAVELENGTH (nm) 900 1000 0 Figure 3. Spectral Response (Normalized) OUTPUT CURRENT (mA) 1000 100 10 1 0.1 0.01 0.001 1 10 100 10 VDD = 3.3 V 100 1000 10000 100000 1000000 Ev (lux) Figure 5. Output Current vs. Ev 1 1 100 1000 Ev (lux) 10000 100000 6 White LED (5600K) White LED (5600K) 50 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 10 Figure 6. Output Current vs. Ev (Medium Gain) 60 40 30 20 10 0 2 No Load 1 kW Load 10 kW Load 100 kW Load 1000 Medium Gain Low Gain 0.0001 0.1 1.5 10000 VDD = 3.3 V 0.00001 0.01 1 Ratio Figure 4. Light Source Dependency (Normalized to Flouroscent Light, Medium Gain Mode) OUTPUT CURRENT (mA) 10000 0.5 0 200 400 600 Ev (lux) 800 5 4 3 2 1 0 1000 0 20 40 60 80 Ev (lux) Figure 7. Output Current vs. Ev, 0-1000 lux (Medium Gain Mode) Figure 8. Output Current vs. Ev, 0-100 lux (Medium Gain Mode) http://onsemi.com 4 100 NOA1211 TYPICAL CHARACTERISTICS -60 -70 -80 -90 50 -60 60 -70 70 -80 80 -90 90 -100 110 -120 130 -140 -150 -160 140 -170 180 170 160 150 1 6 2 5 3 4 90o OUTPUT CURRENT (Normalized to 20C) OUTPUT CURRENT (nA) 0.5 0.4 0.3 0.2 0.1 -20 0 20 40 TEMPERATURE (C) 60 80 100 180 170 160 SIDE VIEW o -90 90o TOP VIEW 1.0 0.8 0.6 0.4 0.0 -60 16 14 6 12 5 4 -40 -20 0 20 40 TEMPERATURE (C) 60 80 100 8 6 2 4 1 2 80 VDD = 3.3 V 10 3 60 Medium Gain Mode Low Gain Mode 0.2 18 0 20 40 TEMPERATURE (C) 120 130 140 150 1.2 7 -20 Q VDD = 3.3 V 1.4 8 -40 90 1.6 20 VDD = 3.3 V 0 -60 80 Figure 12. Output Current at 100 lux vs. Temperature (Medium Gain) IDD (mA) IDD (mA) 9 70 110 Figure 11. Output Current at 0 lux vs. Temperature (Medium Gain) 10 60 Figure 10. Output Current vs. Angle (End View, Normalized, Medium Gain Mode) VDD = 3.3 V -40 50 TOP VIEW 0.7 0.0 -60 40 100 -130 -140 -150 -160 -170 Figure 9. Output Current vs. Angle (End View, Normalized, Medium Gain Mode) 0.6 30 -120 END VIEW -90o 20 -110 Q 120 -130 10 -100 100 -110 0 4 -50 -40 -50 40 -30 -101.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 5 -40 30 -20 3 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 20 6 10 2 0 1 -30 -101.0 -20 0 -60 100 Figure 13. Supply Current at 0 lux vs. Temperature (Medium Gain) -40 -20 0 20 40 TEMPERATURE (C) 60 80 Figure 14. Supply Current at 100 lux vs. Temperature (Medium Gain) http://onsemi.com 5 100 NOA1211 80 1.4 70 SUPPLY CURRENT (mA) 1.6 1.2 1.0 0.8 0.6 0.4 0.0 White LED (5600K) 60 50 40 30 20 10 0.2 0 1 2 3 4 5 0 6 0 200 VDD (V) Figure 15. Output Current at 100 lux vs. Supply Voltage (Medium Gain) 400 600 Lux (Ev) 14 12 10 8 6 4 2 0 0 1 2 800 1000 Figure 16. Supply Current vs. Ev (Medium Gain) 16 SUPPLY CURRENT (mA) OUTPUT CURRENT (Normalized) TYPICAL CHARACTERISTICS 3 VDD (V) 4 5 Figure 17. Supply Current vs. Supply Voltage (Medium Gain) http://onsemi.com 6 6 NOA1211 DESCRIPTION OF OPERATION Ambient Light Sensor Architecture transmits photons in the visible spectrum which are primarily detected by the human eye and exhibits excellent IR rejection. The photo response of this sensor is as shown in Figure 3. The ambient light signal detected by the photo diode is converted to an analog output current by an amplifier with programmable gain. Table 4 shows the gain setting and the corresponding light sensitivity. The NOA1211 employs a sensitive photo diode fabricated in ON Semiconductor's standard CMOS process technology. The major components of this sensor are as shown in Figure 2 . The photons which are to be detected pass through an ON Semiconductor proprietary color filter limiting extraneous photons and thus performing as a band pass filter on the incident wave front. The filter only Table 4. PROGRAMMABLE GAIN SETTINGS GB2 GB1 Mode Output Current @ 100 lux Output Current @ 1000 lux Saturation 0 0 Power Down - - - 1 0 Medium Gain 5.2 mA 52 mA ~100,000 lux 1 1 Low Gain 0.52 mA 5.26 mA > 100,000 lux Power Down Mode maximum desired EV as shown in Equation 3. Equation 4 computes the value for RL (Medium-Gain mode). V OMAX + 5.2 mA100 lux * E VMAX * R L (eq. 3) This device can be placed in a power down mode by setting GB1 and GB2 to logic low level. In order for proper operation of this mode GB1 and GB2 should stay low 1.5 ms. R L + V DD * 0.4 VE VMAX * 100 lux5.2 mA (eq. 4) For example, consider a 5 V supply with a desired EVMAX = 1000 lux, the value of RL would be 88.5 kW. The value for RL can easily be computed for different NOA1211 gain ranges by substituting the appropriate output current at 100 lux from Table 4. The optional capacitor CL can be used to form a low-pass filter to remove 50/60 Hz filter or other unwanted noise sources as computed with Equation 5. External Component Selection The NOA1211 outputs a current in direct response to the incident illumination. In many applications it is desirable to convert the output current into voltage. It may also be desirable to filter the effects of 50/60 Hz flicker or other light source transients. Conversion from current to voltage may be accomplished by adding load resistor RL to the output. The value of RL is bounded on the high side by the potential output saturation of the amplifier at high ambient light levels. RL is bounded on the low side by the output current limiting of the internal amplifier and to minimize power consumption. Equation 1 describes the relationship of light input to current output for the Medium-Gain mode. (eq. 1) I OUT + 5.2 mA100 lux * E V C L + 12p f c R L (eq. 5) For our example, to filter out 60Hz flicker the value of CL would be 30 nF. Power Supply Bypassing and Printed Circuit Board Design Power supply bypass and decoupling can typically be handled with a low cost 0.1 mF to 1.0 mF capacitor. The exposed pad on the bottom of the package is internally connected to VSS pin 2 and should be soldered to the printed circuit board. By adding RL to the output, IOUT is converted into a voltage according to Equation 2. V OUT + I OUT * R L + 5.2 mA100 lux * E V * R L (eq. 2) The range of the output voltage is limited by the output stage to the VOMAX parameter value of VDD - 0.4 V at the http://onsemi.com 7 NOA1211 PACKAGE DIMENSIONS CUDFN6, 1.6x1.6 CASE 505AE-01 ISSUE B NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. CONTROLLING DIMENSION: MILLIMETERS. 3. DIMENSION b APPLIES TO PLATED TERMINAL AND IS MEASURED BETWEEN 0.15 AND 0.30mm FROM THE TERMINAL TIP. 4. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. 0.10 C 2X D 6 A B 4 2X q 0.10 C d E DIM A A1 A3 b D d D2 E E2 e K L q A 1 3 A1 TOP VIEW DETAIL A DETAIL A 0.08 C A3 0.05 C NOTE 4 C SIDE VIEW 0.10 SEATING PLANE END VIEW MOUNTING FOOTPRINT 6X 1.20 C A B M MILLIMETERS MIN MAX 0.55 0.65 0.00 0.05 0.20 REF 0.15 0.25 1.60 BSC --0.10 1.00 1.20 1.60 BSC 0.40 0.60 0.50 BSC 0.20 --0.25 0.35 45 105 0.52 D2 1 3 0.60 E2 K 0.10 6X 6 L 4 e BOTTOM VIEW 6X M 1.90 C A B 1 b 0.10 M C A 0.05 M C 0.50 PITCH B NOTE 3 6X 0.25 DIMENSIONS: MILLIMETERS *For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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