VOLTAGE DETECTOR WITH SENSE PIN

S-1002 Series

Seiko Instruments Inc.

30



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.

GND

VDD

VSS

SENSE

OUT

Microcomputer

GND

VDD

VSS

SENSE

OUT

Microcomputer

Figure 35 Example of Reset Circuit

Figure 36 Example of Reset Circuit

(Nch open-drain output product)

(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.