VOLTAGE DETECTOR WITH SENSE PIN
S-1002 Series
Rev.1.1_02
2. Change of detection voltage
If there is not a product with a specified detection voltage value in the S-1002 Series, the detection voltage can be
changed by using a resistance divider or a diode, as seen in Figure 37 to Figure 40.
In Figure 37 and Figure 38, hysteresis width also changes.
VDD
VDD
R
RA
RA
100 kΩ
VDD
SENSE
VSS
VDD
SENSE
VSS
VIN
VIN
OUT
OUT
RB
RB
GND
GND
Figure 37 Detection voltage change
when using a resistance divider
(Nch open-drain output product)
Figure 38 Detection voltage change
when using a resistance divider
(CMOS output product)
RA + RB
Remark Detection voltage =
• −VDET
• VHYS
RB
RA + RB
Hysteresis width =
RB
VDD
VDD
Vf1
Vf1
R
100 kΩ
VIN
VIN
VDD
SENSE
VSS
VDD
SENSE
VSS
OUT
OUT
GND
GND
Figure 39 Detection voltage change
when using a diode
Figure 40 Detection voltage change
when using a diode
(Nch open-drain output product)
(CMOS output product)
Remark Detection voltage = Vf1 + (−VDET
)
Caution 1. The above connection diagram and constant will not guarantee successful operation.
Perform thorough evaluation using the actual application to set the constant.
2. Set the constants referring to "2. 1 Error when detection voltage is set externally" in
" Operation".
31
SII [ SEIKO INSTRUMENTS INC ]
