BATTERY PROTECTION IC FOR 1-CELL PACK
S-8241 Series
Rev.7.6_00
Timing Chart
(1) Overcharge and overdischarge detection (for products with power-down function)
VCU
VCL
Battery
voltage
VDU
VDL
VDD
DO pin
VSS
VDD
CO pin
VS S
VDD
VM pin
VIOV 1
VSS
VCHA
Charger
connected
Load
connected
Overcharge detection delay time (tCU
)
Overdischarge detection delay time (tDL
)
Mode
(1)
(1)
(2)
(3)
(1)
Note: (1) Normal m ode, (2) Overcharge mode, (3) Overdischarge mode, (4) Overcurrent mode
The charger is assumed to charge with a constant current.
Figure 7
(2) Overcharge and overdischarge detection (for products without power-down function)
V C U
V C L
B atte ry
vo lta ge
V D U
V D L
V DD
DO p in
V SS
V D D
C O pin
V SS
V DD
V M pin
V IO V1
V SS
V CH A
C ha rge r
con nected
Lo ad
con nected
O vercha rge d etecti on de lay tim e ( tC
)
U
O verdi sch arg e detection d ela y tim e (tDL
)
O verd ischarg e detectio n dela y tim e (tDL )
M ode
(1 )
(2 )
(1 )
(3)
(3 )
(1 )
(1 )
N ote: (1) N orm al m ode, (2) O vercharge m ode, (3) O verdis charge m ode, (4) Ov erc urrent m ode
T he charger is assum ed to c harge with a const ant current.
Figure 8
Seiko Instruments Inc.
23
SII [ SEIKO INSTRUMENTS INC ]
