S-8232 Datasheet, PDF (20/27 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK

BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8232 Series
Rev.5.4_00
• After the overcurrent detection, the load was connected for a long time, even if one of the battery voltage
became lower than overdischarge detection voltage (V_{DD1, 2}), the IC can’t detects the overdischarge as
long as the load is connected. Therefore the IC’s current consumption at the one of the battery voltage is
lower than the overdischarge detection voltage is same as normal condition current consumption (I_OPE)
(refer to the Figure 11).
Battery
VDD
voltage
0V
Current
IOPE
c o n s u m p tio n
IPDN
0A
The battery voltage is less than the overdischarge
detection voltage, by self current consumption
As long as the load is connected, the IC’s current is
same as normal current consumption (IOPE)
DO pin
VCC
voltage
VSS
VM pin
voltage
VCC
V IO V2
V IO V1
VSS
EB−
Load connect
The over current delay
Long haul load connected
Figure 11
[Cause]
The reason is as follows. If the overcurrent detection and overdischarge detection occur at same time,
the overcurrent detection takes precedence the overdischarge detection. As long as the IC detects
overcurrent, the IC can’t detect overdischarge.
[Conclusion]
If the load is taken off at least one time, the overcurrent is released and the overdischarge detection
works.
Unless keeping the IC with load for a long time, the reduction of battery voltage will be neglected,
because of the IC’s current consumption (typ. 7.5 µA) is small.
• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in
electrostatic protection circuit.
• SII claims no responsibility for any and all disputes arising out of or in connection with any infringement
of the products including this IC upon patents owned by a third party.
20
Seiko Instruments Inc.