BUILT-IN DELAY CIRCUIT (EXTERNAL DELAY TIME SETTING) VOLTAGE DETECTOR WITH SENSE PIN

S-1004 Series

Seiko Instruments Inc.

33

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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-1004 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 39 and Figure 40.

GND

Microcomputer

VDD

VSS

SENSE

OUT

CD

GND

Microcomputer

VDD

VSS

SENSE

OUT

CD

Figure 39 Example of Reset Circuit

Figure 40 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.