S-1000 Datasheet, PDF (23/38 Pages) Seiko Instruments Inc – ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR

Rev.2.3_00
ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR
S-1000 Series
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.
VDD
R_A^*1
VIN
S-1000N
OUT
VDD
V_f1
V_f2
VIN
S-1000N
OUT
+
R_B
C^*1
−
(Nch open-drain
output products)
VSS
Detection voltagae = ^{RA + RB} • −VDET
RB
Hysterisis width = ^{RA + RB} • VHYS
RB
*1. R_A should be 75 kΩ or less, and C should be 0.01 µF
or more to prevent oscillation.
If C is not connected, R_A should be 800 Ω or less.
VSS
(Nch open-drain
output product)
Detection voltage = V_f1+V_f2+(−V_DET)
Figure 30
Caution
If R_A and R_B are large, the hysteresis width
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.
Seiko Instruments Inc.
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