S-80830C Datasheet, PDF (34/54 Pages) Seiko Instruments Inc – ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR

ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR
S-808xxC Series
Rev.3.2_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 30 to 31. In Figure 30, hysteresis width also changes.
VDD
VDD
R_A^*1
(RA≤75 kΩ) _VIN
S-
808xxCN
OUT
V_f1
V_f2
VIN
S-
808xxCN
OUT
+
R_B
−
(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 to prevent oscillation.
(Nch open-drain
output product)
VSS
Detection voltage=V_f1+V_f2+(−V_DET)
Caution If R_A and R_B 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 30
Figure 31
Caution The above connection diagram and constants do not guarantee correct operation. Perform
sufficient evaluation using the actual application to set the constants.
34
Seiko Instruments Inc.