S-8254AANFT-TB-G Datasheet, PDF (17/29 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC FOR 3-SERIAL- OR 4-SERIAL-CELL PACK

Rev.5.0_01
BATTERY PROTECTION IC FOR 3-SERIAL- OR 4-SERIAL-CELL PACK
S-8254A Series
„ Timing Chart
1. Overcharge Detection and Overdischarge Detection
V_CUn
V_CLn
Battery voltage
V_DUn
V_DLn
(n = 1 to 4)
V_DD
DOP pin voltage
V_SS
V_EB+
COP pin voltage
High-Z
High-Z
V_SS
V_EB+
V_DD
39 / 40×V_DD
VMP pin voltage
1 / 2×V_DD
V_SS
Charger connection
Load connection
Overcharge connection delay time (t_CU)
Status^*1
<1>
<2>
*1. < 1 > : Normal status
< 2 > : Overcharge status
< 3 > : Overdischarge status
< 4 > : Power-down status
Overdischarge connection delay time (t_DL)
<1>
<4>
<1>
<3>
Remark The charger is assumed to charge with a constant current. V_EB+ indicates the open voltage of
the charger.
Figure 9
Seiko Instruments Inc.
17