S-5470A21I-M5T1U Datasheet, PDF (15/24 Pages) Seiko Instruments Inc – ULTRA-LOW CURRENT CONSUMPTION

ULTRA-LOW CURRENT CONSUMPTION NORMALLY-OFF FAINT SIGNAL DETECTION IC
Rev.1.3_01
S-5470 Series
3. Selection of PD or LED
Use PD or LED whose generation voltage is 1.0 V or more under usable light quantity.
Moreover, as for the test circuit shown in Figure 24, select PD or LED that satisfies the conditions below with
detection or measurement of the quantity of light incidence in usage environment.
• Certain photocurrent level detector
I_DET ≤ I
• Photocurrent level difference detector
1 nA ≤ I ≤ 20 μA
I
Light incidence
A
D1, D2
1V
Figure 24
Caution 1.
2.
Select PD or LED after thorough evaluation with actual application. SII Semiconductor Corporation
shall not take responsibility for operation and characteristics of PD or LED.
As for the circuit of detecting photocurrent difference, shown in Figure 22 and Figure 23, use
the two PDs or the two LEDs that have the same characteristics in generation voltage and in
generation current, respectively.
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