SC8201 datasheet(4/9 Pages) SILAN

4 / 9 page

SC8201

HANGZHOU MICROELECTRONICS CO.,LTD

REV:1.3

2008.06.25

Http://www.silan.com.cn

Page 4 of 10

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 0.3

μA).

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 500K

Ω 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.

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