MANUAL RESET BUILT-IN DELAY CIRCUIT (EXTERNAL DELAY TIME SETTING) HIGH-ACCURACY VOLTAGE DETECTOR

S-1003 Series

Seiko Instruments Inc.

33

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-1003 Series which has the low operation voltage, a high accuracy detection voltage and hysteresis,

reset circuits can be easily constructed as seen in Figure 38 and Figure 39.

GND

VDD

MR

CD

VSS

OUT

*1

Microcomputer

*1.

GND

VDD

VSS

MR

CD

OUT

*1

Microcomputer

*1.

Figure 38 Example of Reset Circuit

(CMOS Output Product)

Figure 39 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.