Panasonic NaPiCa Operation Manual

Light Sensor (AMS3)

Cadmium-free sensor with spectral response The Through-hole Type for easy implementation as a CdS cell replacement

FEATURES

1

Amplifier

2

1 Anode

2 Cathode

1. Built-in optical filter for spectral response similar to that of the human eye.

Peak sensitivity wavelength is 580 nm

	1.0
					Human spectral
					NaPiCa spectral
<![if ! IE]> <![endif]>sensitivity	0.8
	0.6
<![if ! IE]> <![endif]>Relative	0.4
	0.2
	0
	400	500	600	700	800	900	1000 1100

Wavelength, nm

2.Photocurrent is proportional to illumination. (linear output)

High photocurrent is achieved by built-in

photocurrent amp. IL = 260 A (typical)

Ev = 100 lx (florescent light)

3.Uses environmentally friendly silicon chips.

4.Lead-free.

5.Operates on 1.5 to 6 V DC, which is suitable for battery operation.

6.Same through-hole shape as CdS cell.

Light Sensor

“Through-hole Type”

TYPICAL APPLICATIONS

1.Brightness detection for LCD backlight control for LCD devices (LCD TVs, car navigation systems, etc.)

2.Brightness detection for circuits in household lighting, crime prevention lighting, and automatic lighting for bicycle.

3.Brightness detection for wall clocks (radio clocks).

4.Brightness detection for surveillance cameras (night switching).

TYPES

Photocurrent	Part No.	Packing quantity
260 A*	AMS302T	2,000pcs.

Note: Ev = 100 lx (Fluorescent lamp is used as light source)

Tape package is the standard packing style.

RATINGS

1. Absolute maximum ratings (Ambient temperature: 25°C 77°F)

Item	Symbol	AMS302	Remarks
Reverse voltage	VR	–0.5 to 8 V	—
Photocurrent	IL	5 mA	—
Power dissipation	P	40 mA	—
Operating temperature	Topr	–30 to +85°C –22 to +185°F	Non-condensing at low temperatures
Storage temperature	Tstg	–40 to +100°C –40 to +176°F	Non-condensing at low temperatures

2. Recommended operating condition

	Item		Symbol	AMS302	Remarks
	Reverse voltage	Minimum	VR	1.5 V	—
		Maximum		6 V

Light Sensor NaPiCa Through-hole Type

ASCT1B295E ’05.2

1

http://www.nais-e.com/ Panasonic...the new name for

Matsushita Electric Works, Ltd.

Light Sensor (AMS3)

3. Electrical characteristics (Ambient temperature: 25°C 77°F)

Item

Symbol

AMS302

Condition

Peak sensitivity wavelength

—

λp

580 nm

—

Minimum

9.1µA

Photocurrent 1

Typical

IL1

13µA

VR = 5 V, EV = 5 lx*1

Maximum

16.9µA

Minimum

182µA

Photocurrent 2

Typical

IL2

260µA

VR = 5 V, EV = 100 lx*1

Maximum

338µA

Photocurrent 3

Typical

IL3

500µA

VR = 5 V, EV = 100 lx*2

Dark current

Maximum

ID

0.3µA

VR = 5 V

Switching time

Rise time

Typical

tr

8.5 ms

VR = 2.5 V, VO = 2.5 V, RL = 5kΩ

Fall time

Typical

tf

8.5 ms

*1 Fluorescent lamp is used as light source. (Substituted with white LED for testing before shipping.)

*2 CIE standard illuminant ‘A’ is used as light source.

* Measuring method for switching time.

IF

White LED

AMS302

5.0V

2.5V

90%

IF

V0

10%

RL

V0

tr

tf

REFERENCE DATA
1. Power dissipation vs. ambient temperature							2. Relative sensitivity vs. wavelength								3. Dark current vs. ambient temperature
characteristics							characteristics								characteristics
							Ambient temperature: 25°C 77°F								Reverse voltage: 5V
	50							1.0								10
												Human spectral
<![if ! IE]> <![endif]>dissipation,PowermW												NaPiCa spectral
	40						<![if ! IE]> <![endif]>sensitivityRelative	0.8							<![if ! IE]> <![endif]>current,DarkA	1
	30							0.6
																0.1
	20							0.4
	10							0.2								0.01
	0							0								0.001
	0	20	40	60	8085	100		400	500	600	700	800	900	1000 1100		20	40	60	80	100

Ambient temperature, °C		Wavelength, nm		Ambient temperature, °C

4. Photocurrent vs. brightness characteristics

Light source: Fluorescent lamp, CIE standard “A” Reverse voltage: 5V, Ambient temperature: 25°C 77°F

	10000	Fluorescent lamp
		CIE standard “A”
<![if ! IE]> <![endif]>A	1000
<![if ! IE]> <![endif]>Photocurrent,	100
	10
	1	10	100	1000	10000
	1

Brightness, lx

5. Relative photocurrent vs. ambient temperature characteristics

Light source: Fluorescent lamp, Brightness: 100 lx Reverse voltage: 5V

<![if ! IE]> <![endif]>photocurrent		1.4
		1.2
<![if ! IE]> <![endif]>Relative
		1.0
		0.8
		0.6
		–40 –20 0				20 40 60 80 100

Ambient temperature, °C

6. Relative photocurrent vs. reverse voltage characteristics

Light source: Fluorescent lamp, Brightness: 100 lx Ambient temperature: 25°C 77°F

		1.2
	<![if ! IE]> <![endif]>photocurrent	1.0
		0.8
	<![if ! IE]> <![endif]>Relative
		0.6
		0.4

0.2

0

0

1

2

3

4

5

6

7

8

Reverse voltage, V

2