NaPiCa Light Sensor Panasonic Electric Works Corporation of America Oct 2009
NaPiCa Light Sensor Oct 2009 Panasonic Electric Works Corporation of America NaPiCa Light Sensor SMD Description NaPiCa is a visible light sensor (photo IC). Design consists of a photodiode and a built-in current amplifier. Through-hole Function NaPiCa sensor works by detecting visible light and converting it to electrical current. A special filter allows sensitivity that resembles the human eye. Usage Visible light sensors are used to conserve energy, reduce environmental impact, improve safety and convenience. Chip 2 Panasonic Electric Works Corporation of America Confidential Technology Comparison Material Product Name Photodiode Visible Light Sensor Silicon Silicon Photo IC Solar cell Cadmium sulfide Photodiode 3 Phototransistor NaPiCa Amorphous silicon CdS photoconductive cell Output current is low and requires an amplifier for high output current. Phototransistor Integrated photodiode combined with a transistor. Good performance with low output current. Silicon Photo IC Integrated photodiode and amplifier IC with a high photocurrent output. Amorphous silicon High visual sensitivity with low photocurrent. Requires an amplifier and optical filter. CdS photoconductive cell Diode becomes conductive when internal resistance changes due to the illumination level. Features response similar to the human eye. Contains cadmium and not RoHS compliant. Panasonic Electric Works Corporation of America Confidential Wavelength Sensitivity Characteristics • Built-in optical filter provides sensitivity characteristics near human vision spectral sensitivity ⇒ Peak sensitivity wavelength: 580nm (Chip design: 560nm) UV spectrum Visible light spectrum Infrared spectrum 1 Relative sensitivity 0.8 0.6 Human spectral sensitivity NaPiCa spectral sensitivity (SMD, through-hole) NaPiCa spectral sensitivity (Chip) 0.4 0.2 0 300 400 500 600 700 800 900 1000 1100 Wavelength (nm) 4 Panasonic Electric Works Corporation of America Confidential Linear Output 10000 Photocurrent 1000 SMD, through-hole Chip 100 10 (μA) 1 0.1 1 10 100 1000 10000 Brightness (lx) Typical Characteristics 5 Item Symbol SMD / Through-hole Chip Illumination (fluorescent light) Photocurrent 1 IL1 13A 1A 5 lx Photocurrent 2 IL2 260A 20A 100 lx Panasonic Electric Works Corporation of America Confidential No Need for External Amplifier Internal circuit Built-in amp AMS104 SMD Amp AMS402 Chip AMS302 Through-hole High sensitivity (photocurrent output) 6 Panasonic Electric Works Corporation of America Confidential Sensor Enclosure NaPiCa Others Incident light Incident light Cover Cover Incident light attenuation 7 Incident light attenuation High sensitivity Low sensitivity Sufficient output Insufficient output Panasonic Electric Works Corporation of America Confidential Temperature Stability NaPiCa Others Approx. -50% to +100% Approx. 5% Sensitivity Sensitivity -30℃ 8 Temperature +85℃ -30℃ Temperature Panasonic Electric Works Corporation of America +85℃ Confidential Terminal Shape NaPiCa SMD Close-up of terminal soldering inspection 9 Panasonic Electric Works Corporation of America Confidential Chip Version AMS104 AMS402 Compact, small current consumption 1.0 0.55 1.25 2.0 3.2 ※ Built-in amp circuit 2.0 ※ Built-in amp circuit Photocurrent = 260μA @100 lx Photocurrent = 20μA @100 lx (Dimension unit: mm) 10 Panasonic Electric Works Corporation of America Confidential Brightness vs. Output Voltage Vcc Light AMS104 Vo IL 11 RL Output voltage V O（ V） Light source: fluorescent, power voltage: 5V, ambient temperature: 25 oC 5 4 3 2 Load resistance RL 1 1kΩ 5.1kΩ 0 0 200 400 600 Brightness (lx) Panasonic Electric Works Corporation of America 2kΩ 10kΩ 800 3kΩ 20kΩ 1000 Confidential Reverse Voltage & Photocurrent Input side (cathode) Apply voltage to photodiode Light Forward voltage ＋ Reverse voltage ＋ ＋ × NO － － uA － YES Amp pA Output side (anode) Figure 1 – Reverse voltage applied to photodiode 12 Panasonic Electric Works Corporation of America Confidential Dark Current (Leakage Voltage) Input side(cathode) When reverse voltage is applied into a sensor at a dark place, leakage voltage occurs. This value is called “dark state current”. Sensors have leakage current because of semiconductor characteristics. Amp nA Output side(anode) Maximum 0.3μA (SMD, through-hole), maximum 0.05μA (Chip) 13 Panasonic Electric Works Corporation of America Confidential Light Sensor Reference Data 10,000 Photocurrent (μA) 1,000 100 100 lx：260A 10 5 lx：13A 1 1 10 100 1000 10000 Brightness （lx） Figure 2 – Photocurrent vs. brightness characteristics Photocurrent Reverse voltage Output voltage Load resistance Power voltage Vcc Cathode Anode Microcomputer Comparator Figure 3 – General circuit configuration 14 Panasonic Electric Works Corporation of America Confidential Power dissipation (mW) Dark current (uA) Power Dissipation, Dark Current, Photocurrent Ambient temp. (°C) Ambient temp. (°C) Figure 4 – Power dissipation vs. ambient temperature characteristics Figure 5 – Dark current vs. ambient temperature characteristics Light source: fluorescent, CEI standard A light source; Reverse voltage: 5V; Ambient temp.: 25oC Photocurrent (uA) Figure 6 – Photocurrent vs. brightness characteristics Brightness (lx) 15 Panasonic Electric Works Corporation of America Confidential Relative Current, Switching Time Relative photocurrent (uA) Light source: fluorescent; Brightness: 100 lx; Reverse voltage: 5 V Figure 7 – Relative photocurrent vs. ambient temp. characteristics Ambient temp. (°C) Relative photocurrent (uA) Figure 8 – Relative photocurrent vs. reverse voltage characteristics Figure 9 – Switching time vs. load resistance characteristics NaPiCa SMD Ambient temp. (°C) 16 Light source: White LED; Reverse voltage: 2.5 V; Load resistance power: 2.5 V; Ambient temp.: 25oC Switching time (ms) Light source: fluorescent lamp; Brightness: 100 lx; Ambient temp: 25oC Load resistance (kΩ) Panasonic Electric Works Corporation of America Confidential NaPiCa Product Line AMS302 Through-hole • CdS replacement • 260μA photo current • Automatic mounting • 260μA photo current AMS104 • Compact design • Low current consumption SMD AMS402 Chip 17 Panasonic Electric Works Corporation of America Confidential Display Backlight Control NaPiCa light sensor Vcc Light ② Change of load resistance voltage 18 Amp Photocurrent μP Driver ① Photocurrent of light sensors varies depending on ambient temperature ③ Microcomputer adjusts the brightness of LCD backlight R Load Panasonic Electric Works Corporation of America Confidential Sensor Applications 19 Panasonic Electric Works Corporation of America Confidential NaPiCa Advantage • Built-in amplifier eliminates external amplification • Photo IC with high sensitivity • Temperature stability with minimum sensitivity effect • RoHS friendly silicon design and easy CdS cell replacement • SMD, through-hole and chip design 20 Panasonic Electric Works Corporation of America Confidential End Panasonic Electric Works Corporation of America
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