Panasonic Electric Works Corporation of America NaPiCa Light Sensor Oct 2009

Panasonic Electric Works Corporation of America 2 Confidential Description NaPiCa is a visible light sensor (photo IC). Design consists of a photodiode and a built-in current amplifier.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. NaPiCa Light Sensor SMD Through-hole Chip

Panasonic Electric Works Corporation of America 3 ConfidentialMaterial Product Name Photodiode Solar cell Silicon Photo IC CdS photoconductive cell Amorphous silicon Visible Light Sensor Phototransistor Cadmium sulfide Silicon NaPiCa Technology ComparisonPhotodiodePhototransistor Silicon Photo IC Amorphous silicon CdS photoconductive cell Output current is low and requires an amplifier for high output current. Integrated photodiode combined with a transistor. Good performance with low output current. Integrated photodiode and amplifier IC with a high photocurrent output. High visual sensitivity with low photocurrent. Requires an amplifier and optical filter. 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 4 Confidential Built-in optical filter provides sensitivity characteristics near human vision spectral sensitivity ⇒ Peak sensitivity wavelength: 580nm (Chip design: 560nm) Wavelength (nm) Relative sensitivity Human spectral sensitivity NaPiCa spectral sensitivity (SMD, through-hole) NaPiCa spectral sensitivity (Chip) Infrared spectrum Visible light spectrum UV spectrum Wavelength Sensitivity Characteristics

Panasonic Electric Works Corporation of America 5 Confidential Photocurrent 2 I L1 I L2 Item Symbol 13  A 260  A SMD / Through-hole 5 lx 100 lx Illumination (fluorescent light) 1A1A 20  A Chip Photocurrent 1 Typical Characteristics Linear Output

Panasonic Electric Works Corporation of America 6 Confidential Amp AMS104 AMS302 Through-hole SMD Internal circuit Built-in amp High sensitivity (photocurrent output) No Need for External Amplifier AMS402 Chip

Panasonic Electric Works Corporation of America 7 Confidential Cover Incident light Sufficient output Incident light attenuation Incident light Cover Incident light attenuation Insufficient output High sensitivity Low sensitivity NaPiCa Others Sensor Enclosure

Panasonic Electric Works Corporation of America 8 Confidential -30 ℃ +85 ℃ -30 ℃ +85 ℃ Temperature Approx.  5% Approx. -50% to +100% Sensitivity Temperature NaPiCa Others Temperature Stability

Panasonic Electric Works Corporation of America 9 Confidential Terminal Shape Close-up of terminal soldering inspection NaPiCa SMD

Panasonic Electric Works Corporation of America 10 Confidential AMS104 AMS Photocurrent = lxPhotocurrent = lx (Dimension unit: mm) ※ Built-in amp circuit Compact, small current consumption Chip Version

Panasonic Electric Works Corporation of America 11 Confidential Vcc RLRL Vo ILIL AMS104 Light Light source: fluorescent, power voltage: 5V, ambient temperature: 25 o C Load resistance R L Brightness vs. Output Voltage

Panasonic Electric Works Corporation of America 12 Confidential Reverse voltage Apply voltage to photodiode Forward voltage ＋ － × ＋ － ＋ － NO YES Reverse Voltage & Photocurrent Amp Input side (cathode) Output side (anode) pA uA Light Figure 1 – Reverse voltage applied to photodiode

Panasonic Electric Works Corporation of America 13 Confidential 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. Maximum 0.3μA (SMD, through-hole), maximum 0.05μA (Chip) Dark Current (Leakage Voltage)

Panasonic Electric Works Corporation of America 14 Confidential 100 lx ： 260  A 5 lx ： 13  A Linear output Light Sensor Reference Data Reverse voltage Power voltage Output voltage Cathode Anode Vcc Microcomputer Load resistance Photocurrent Comparator Figure 2 – Photocurrent vs. brightness characteristics Figure 3 – General circuit configuration

Panasonic Electric Works Corporation of America 15 Confidential 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.: 25 o C Figure 6 – Photocurrent vs. brightness characteristics Power dissipation (mW) Ambient temp. (°C) Dark current (uA) Ambient temp. (°C) Photocurrent (uA) Brightness (lx) Power Dissipation, Dark Current, Photocurrent

Panasonic Electric Works Corporation of America 16 Confidential Figure 8 – Relative photocurrent vs. reverse voltage characteristics Light source: fluorescent lamp; Brightness: 100 lx; Ambient temp: 25 o C Light source: White LED; Reverse voltage: 2.5 V; Load resistance power: 2.5 V; Ambient temp.: 25 o C Figure 9 – Switching time vs. load resistance characteristics NaPiCa SMD Relative photocurrent (uA) Ambient temp. (°C) Switching time (ms) Load resistance (kΩ) Relative Current, Switching Time Relative photocurrent (uA) Ambient temp. (°C) Figure 7 – Relative photocurrent vs. ambient temp. characteristics Light source: fluorescent; Brightness: 100 lx; Reverse voltage: 5 V

Panasonic Electric Works Corporation of America 17 Confidential AMS104 SMD Automatic mounting 260μA photo current AMS302 Through-hole CdS replacement 260μA photo current AMS402 Chip Compact design Low current consumption NaPiCa Product Line

Panasonic Electric Works Corporation of America 18 Confidential R Load ① Photocurrent of light sensors varies depending on ambient temperature Light Photo- current ② Change of load resistance voltage ③ Microcomputer adjusts the brightness of LCD backlight Driver Amp NaPiCa light sensor Vcc μPμP Display Backlight Control

Panasonic Electric Works Corporation of America 19 Confidential Sensor Applications

Panasonic Electric Works Corporation of America 20 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

Panasonic Electric Works Corporation of America End