SUPER-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR
S-808xxC Series
Rev.4.3_00
3. Change of Detection Voltage
In Nch open-drain output products of the S-808xxC series, detection voltage can be changed using
resistance dividers or diodes as shown in Figures 32 to 33. In Figure 32, hysteresis width also changes.
VDD
VDD
Vf1
Vf2
*1
RA
(RA≤75 kΩ)
S-
S-
VIN
VIN
808xxCN
OUT
OUT
808xxCN
+
−
(Nch open-drain
output product)
RB
(Nch open-drain
output products)
VSS
Detection voltage=Vf1+Vf2+(−VDET
VSS
Detection voltagae = RA + RB • −VDET
)
RB
Hysterisis width = RA + RB • VHYS
RB
*1. RA should be 75 kΩ or less to prevent oscillation.
Caution If RA and RB are large, the hysteresis
width may aloso 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 32
Figure 33
Caution The above connection diagram and constants do not guarantee correct operation. Perform
sufficient evaluation using the actual application to set the constants.
36
Seiko Instruments Inc.
SII [ SEIKO INSTRUMENTS INC ]
