S11059-01WT Datasheet, PDF (6/9 Pages) Hamamatsu Corporation – I2C interface-compatible color sensor

Color sensor
S11059-01WT
Compensation method for sensitivity variation
1. Power on
2. Power on reset, initialization
Sensitivity variation can be decreased using the compensation coefficient which is calcu-
lated from the integration time measurement result. Explanation of compensation method
is shown as follows.
3. ADC reset enable, standby disable
4. Measurement condition setting
Gain, manual setting mode, integration time
Integration time measurement method
In case of integration time measurement, it is necessary to set manual setting mode. The integra-
tion time measurement starts after “ADC reset” disabled. To measure the ¿nishing integration time
(measurement) Tmeas, check “Standby monitor” bit until it becomes to “1”.
5. ADC reset disable
6. Measurement start (integration time)
No
Standby monitor = “1”?
Yes
7. Measurement end (integration time)
8. Data read out
9. Compensation
Compensation method
The sensitivity compensation that used integration time is as follows:
Tset
K=
Tmeas
S' = S · K
K : compensation coef¿cient
Tset : integration time (setting)
Tmeas: integration time (measurement)
S : photo sensitivity (measurement)
S’ : photo sensitivity (compensation)
Measurement accuracy of integration time
The measurement minimum resolution of Tmeas is de¿ned by the looping duration (Tunit). In
case of default setting, the Tset is 2184 ms and assuming the Tunit to 7.8 ms, the accuracy of in-
tegration time is calulated by following formula.
Tunit _{× 100 =} 7.8 _{× 100 = 0.36%}
Tset
2184
The speci¿cation of compensated sensitivity is de¿ned as 0.36% accuracy.
Spectral response
100
Red
Green
80
(Typ. Ta=25 °C)
60
Blue
40
20
Infrared
0
300 400 500 600 700 800 900 1000
Wavelength (nm)
KPICB0132EA
Count value vs. illuminance (typical example)
[Initial setting (integration time 546 ms/ch, low gain), A light source]
100 k
Red
9.48 counts/lx
10 k
Green
7.61 counts/lx
1k
Blue
3.35 counts/lx
100
10
Infrared
1.66 counts/lx
1
0.1
1
10 100 1 k 10 k 100 k
Illuminance (lx)
KPICB0130EB
6