ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR

S-1000 Series

Seiko Instruments Inc.

23

3. Change of detection voltage

In Nch open-drain output products of the S-1000 series, detection voltage can be changed using resistance dividers or

diodes as shown in Figures 29 to 30. In Figure 29, hysteresis width also changes.

(Nch open-drain

output products)

*1

OUT

VIN

VSS

VDD

+

−

S-1000N

C

*1

DET

B

B

A

V

R

R

R

voltagae

Detection

−

•

+

=

HYS

B

B

A

V

R

R

R

width

Hysterisis

•

+

=

(Nch open-drain

output product)

OUT

VIN

VSS

VDD

S-1000N

Figure 30

*1.

Ω or less, and C should be 0.01 µF

or more to prevent oscillation.

Ω or less.

may also be larger than the value given by

the above equation due to the through-type

current (which flows slightly in an Nch

open-drain product).

Figure 29

Caution The above connection diagram and constants do not guarantee correct operation. Perform sufficient

evaluation using the actual application to set the constants.