SC8201 Datasheet, PDF (4/9 Pages) Silan Microelectronics Joint-stock – ONE-CELL LI+ BATTERY PROTECTION CIRCUIT

SC8201
Overdischarge Detection
When enter overdischarge state from normal state, the battery voltage can be detected from VDD. When the
battery voltage VDD is smaller than VODL over a delay time of TOD; M1 is to be turned off. In the meanwhile, CSI
is pulled to VDD by way of internal resistor RCSID. If VCSI>VOI2, the protection IC enters into Power-down mode.
(Its current consumption is lower than 0.3μA).
Release of Power-down Mode
A charger is connected while the battery remains in Power-down mode, if VCH<VCSI<VOI2 and VDD<VODR
occur, M1 is still off but it releases Power-down mode. If VDD>VODR occurs, M1 is to be turned on and back to
normal state.
Charge Detection
If a charger is connected to the battery remained in Power-down mode, if VCSI<VCH and VDD>VODL, M1 is to
be turned on and back to normal state.
Abnormal Charging State
If a charger is connected to the battery in normal state, VCSI<VCH occurs over a delay time longer than TOC,
M2 is to be turned off.
Over Current/Short Current Detection
When the discharging current is too large under normal state and the voltage detected from CSI is larger than
VOI1 (VIO2) for over a certain delay time TOI1 (TIO2), it means the over current/short current state occurred. M1 is
turned off. CSI is pulled to VSS by way of an internal resistor RCSIS.
Release of Over Current/Short Current State
While the protection IC remains in Over Current/Short Current state and load is removed or the impedance
between VBAT+ and VBAT- is larger than 500KΩ and VCSI<VOI1, M1 is to be turned on and back to normal state.
Note: when a battery is connected to a protection IC for the first time, the IC may not enter the normal state (not
dischargeable state). If this occurs, set the CSI pin voltage equal to the VSS voltage (short the CSI and
VSS pins or connect a charger) to enter the normal state.
HANGZHOU MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.3 2008.06.25
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