S-809XXC Datasheet, PDF (24/36 Pages) Seiko Instruments Inc – ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR WITH DELAY CIRCUIT (EXTERNAL DELAY TIME SETTING)

ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR WITH DELAY CIRCUIT (EXTERNAL DELAY TIME SETTING)
S-809xxC Series
Rev.3.3_00
2. Change of Detection Voltage
In Nch open-drain output products of the S-809xxC 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
(RA≤75 kΩ) _VIN
S-
809xxCN
OUT
VDD
V_f1
V_f2
VIN
S-
809xxCN
OUT
+
R_B
−
VSS
(Only for Nch
open-drain
products)
Detection voltage = ^{RA + RB} • −VDET
RB
Hysteresis width = ^{RA + RB} • VHYS
RB
*1. R_A should be 75 kΩ or less tp prevent oscillation.
VSS
(Only for Nch
open-drain
products)
Detection voltage=V_f1+V_f2+(−V_DET)
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
through- type current (which flows
slightly in an Nch open-drain products).
Figure 29
Figure 30
Caution The above connection diagram and constant will not guarantees successful operation.
Perform through evaluation using the actual application to set the constant.
24
Seiko Instruments Inc.