S11059-02DT_15 Datasheet, PDF (6/11 Pages) Hamamatsu Corporation – Digital color sensor

Digital color sensor
S11059-02DT/-03DS
Compensation method for sensitivity variation
1. Power on
2. Power on reset, initialization
Sensitivity variation can be decreased using the compensation coefficient which is cal-
culated 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
integration time measurement starts after “ADC reset” disabled. To measure the finishing inte-
gration 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 coefficient
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 defined by the looping duration (Tunit).
In case of default setting, the Tset is 2184 ms and assuming the Tunit to 7.8 ms, the accu-
racy of integration time is calculated by following formula.
Tunit
Tset
× 100 =
7.8
2184
× 100 = 0.36%
The specification of compensated sensitivity is defined as 0.36% accuracy.
Spectral response (typical example)
(Ta=25 °C)
100
Red
80
Green
60
Blue
40
Infrared
20
0
200 300 400 500 600 700 800 900 1000
Wavelength (nm)
KPICB0169EA
Count value vs. illuminance (typical example)
[Initial setting (integration time 546 ms/ch, low gain), A light source]
100 k
Red
11.2 counts/lx
10 k
Green
8.35 counts/lx
1 k ^Blue
4.4 counts/lx
100
10
Infrared
3.0 counts/lx
1
0.1
0.01
0.1
1
10 100 1 k 10 k 100 k
Illuminance (lx)
KPICB0170EA
6