ALS-PDIC17-77C-TR8 Datasheet, PDF (7/12 Pages) Everlight Electronics Co., Ltd – Ambient Light Sensor

Surface - Mount
Ambient Light Sensor
ALS-PDIC17-77C/TR8
Fig.11 Consumption current vs. Illuminance
1000
℃ ^{Vcc = 3V}
Ta = 25
100
Fig.12 Relative consumption current vs. Temperature
1.4
Vcc = 3V
Ev = 100 Lux
1.2 ^{RL= 1kΩ}
10
1.0
R_L = 5.1 kΩ
R_L = 50 kΩ
1
R_L = 100 kΩ
0.8
0.1
1
10
100
1000
10000
0.6
-40
-20
0
20
40
60
80
100
Illuminance (Lux)
℃ Temperature ( )
Converting Photocurrent to Voltage
Vcc
Current
Amp
Iph
Vout
RL CL
Note:
GND
1. The output voltage (Vout) is the product of photocurrent (IPH) and loading resistor (RL)
2. A right loading resistor shall be chosen to meet the requirement of maximum ambient light and
output saturation voltage:
≦ ＝ － Vout(max.) = Iout(max.) × RL Vout(saturation) Vcc 0.6V
3. To avoid 60Hz ripple from fluorescent lamps, we suggest that the time constant must be greater
than
0.5 second:
≧ RL × CL 0.5 (empirical data)
Everlight Electronics Co., Ltd.
Document No: DLS-0000025 Rev4
7
http://www.everlight.com
Jun. 20, 2011