AT25DF161-SH ATMEL [ATMEL Corporation], AT25DF161-SH Datasheet - Page 15

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AT25DF161-SH

Manufacturer Part Number
AT25DF161-SH
Description
8-bit Atmel Microcontrollers
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet

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8394B-AVR-02/12
Table 5-10. Symbol description for illuminance calculation.
Table 5-11. Illuminance vs. ADC input voltage.
Symbols
ICA
E v
I
U
R
E v = 100 x I / ICA
I = U / R
U = (E v x R x ICA) / 100
Illuminance [lux]
1
10
20
30
40
50
60
70
80
90
100
200
300
400
500
600
700
800
900
1000
Current through the sensor
Description
Calibrated sensor responsivity at 100lx. This is 50µA according
to the sensor datasheet
Illuminance
Output voltage of the sensor circuitry that is provided to the ADC
Series resistor of the sensor circuitry. 4.7kΩ has been chosen in
this design
Illuminance is calculated based on the relation of the actual
current through the sensor to the calibrated value at 100lx
Since the ADC measures the voltage across the series resistor
of the sensor circuitry it is necessary to calculate the voltage
based on the current
Based on the current and the illuminance the output voltage of
the sensor circuitry can be calculated
ADC input [V]
0.0024
0.0235
0.0470
0.0705
0.0940
0.1175
0.1410
0.1645
0.1880
0.2115
0.2350
0.4700
0.7050
0.9400
1.1750
1.4100
1.6450
1.8800
2.1150
2.3500
Atmel AVR1923
Illuminance
Dusk
Dusk
Dusk
Dusk
Dusk
Living room
Living room
Living room
Living room
Living room
Living room
Office lighting
Office lighting
Office lighting
Office lighting
Office lighting
Office lighting
Office lighting
Office lighting
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