HIGH WITHSTAND-VOLTAGE VOLTAGE REGULATOR WITH RESET FUNCTION
S-87x Series
Rev.8.0_00
Seiko Instruments Inc.
42
2. C/ G type
V
SS
V
OR
V
OUT
V
IN
VOR
VIN
VSS
VOUT
VPF
Figure 38
Caution The above connection diagram and constants do not guarantee correct operation.
Perform sufficient evaluation using the actual application to set the constants.
3. Power supply for lithium-ion battery pack
When the lithium-ion battery goes down to the overdischarge voltage, the built-in voltage detector powers
OFF the voltage regulator, and at the same time it transmits the RESET signal to the microcomputer. R
1
,
C
1
, R
2
and C
2
are attached to eliminate the voltage exceeding the absolute maximum ratings of charger.
C
3
is attached to give a delay and to release the RESET signal after power supply voltage for
microcomputer (V
OUT
) rises high enough.
SENSE
VOR
VIN
VSS
VOUT
S-87xxxxE
Series
RESET
Micro-computer
10 μF
R
3
100 kΩ
C
3
C
2
0.1 μF
C
1
0.1 μF
R
2
330 Ω
Li
R
1
330 Ω
Charger
Figure 39
Caution The above connection diagram and constants do not guarantee correct operation.
Perform sufficient evaluation using the actual application to set the constants.
