S1009 Datasheet, PDF (26/43 Pages) Seiko Instruments Inc – SUPER-LOW CURRENT CONSUMPTION SUPER HIGH-ACCURACY VOLTAGE

SUPER-LOW CURRENT CONSUMPTION SUPER HIGH-ACCURACY VOLTAGE DETECTOR WITH DELAY CIRCUIT (EXTERNAL DELAY TIME SETTING)
S-1009 Series
Rev.5.1_00
„ Application Circuit Examples
1. Microcomputer reset circuits
In microcomputers, when the power supply voltage is lower than the guaranteed operation voltage, an unspecified
operation may be performed or the contents of the memory register may be lost. When power supply voltage
returns to the normal level, the microcomputer needs to be initialized. Otherwise, the microcomputer may
malfunction after that. Reset circuits to protect microcomputer in the event of current being momentarily switched
off or lowered.
Using the S-1009 Series which has the low operation voltage, a high accuracy detection voltage and hysteresis,
reset circuits can be easily constructed as seen in Figure 28 and Figure 29.
VDD
VDD1
VDD2
S-1009C
Microcomputer
S-1009N
Microcomputer
VSS
VSS
Figure 28 Example of Reset Circuit
(CMOS Output Product)
Figure 29 Example of Reset Circuit
(Nch Open-drain Output Product)
Caution The above connection diagram and constant will not guarantee successful operation.
Perform thorough evaluation using the actual application to set the constant.
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Seiko Instruments Inc.