S-8211EAC-M5T1U Datasheet, PDF (13/29 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC

Rev.2.4_02
BATTERY PROTECTION IC FOR 1-CELL PACK
S-8211E Series
 Operation
Remark Refer to the “ Battery Protection IC Connection Example”.
1. Normal Status
The S-8211E Series monitors the voltage of the battery connected between the VDD and VSS pins.
In case of overdischarge detection voltage (VDL) ≤ battery voltage ≤ overcharge detection voltage (VCU), the output
levels of CO and DO pins are as follows. This is the normal status.
Table 12
CO Pin Output Logic
CO Pin
Active “H”
VVM
Active “L”
VDD
DO Pin
VDD
VDD
2. Overcharge Status
When the battery voltage in the normal status exceeds the overcharge detection voltage (VCU) during charge, and this
status is held for the overcharge detection delay time (tCU) or more, the output levels of CO and DO pins are as
follows. This is the overcharge status.
This overcharge status is released when the battery voltage decreases to the overcharge release voltage (VCL) or
less.
Table 13
CO Pin Output Logic
CO Pin
DO Pin
Active “H”
Active “L”
VDD
VVM
VDD
VDD
3. Overdischarge Status
When the battery voltage in the normal status decreases than the overcharge detection voltage (VDL) during
discharge, and this status is held for the overdischarge detection delay time (tDL) or more, the output levels of CO and
DO pins are as follows. This is the overdischarge status.
This overdischarge status is released when the battery voltage increases to the overdischarge release voltage (VDU)
or more.
Table 14
CO Pin Output Logic
CO Pin
Active “H”
VVM
Active “L”
VDD
DO Pin
VSS
VSS
4. Delay Circuit
The detection delay times are determined by dividing a clock of approximately 3.5 kHz by the counter.
13