S1002 Datasheet, PDF (30/39 Pages) Seiko Instruments Inc – VOLTAGE DETECTOR WITH SENSE PIN

VOLTAGE DETECTOR WITH SENSE PIN
S-1002 Series
Rev.1.1_00
 Application Circuit Examples
1. Microcomputer reset circuits
In microcomputers, when the power supply voltage is lower than the minimum 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-1002 Series which has the low minimum operation voltage, the high-accuracy detection voltage and
the hysteresis width, reset circuits can be easily constructed as seen in Figure 35 and Figure 36.
V_DD
V_DD1
V_DD
V_DD1
VDD
SENSE
OUT
VSS
Microcomputer
VDD
SENSE
OUT
VSS
Microcomputer
GND
Figure 35 Example of Reset Circuit
(Nch open-drain output product)
GND
Figure 36 Example of Reset Circuit
(CMOS 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.