ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR
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.
Detection voltagae = RA + RB • −VDET
Hysterisis width = RA + RB • VHYS
*1. RA should be 75 kΩ or less, and C should be 0.01 µF
or more to prevent oscillation.
If C is not connected, RA should be 800 Ω or less.
Detection voltage = Vf1+Vf2+(−VDET)
If RA and RB 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
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.