SC121 datasheet(4/9 Pages) SILAN

4 / 9 page

SC121

HANGZHOU MICROELECTRONICS CO.,LTD

REV:1.6

2009.07.20

Http:// www.silan.com.cn

Page 4 of 9

FUNCTION DESCRIPTIONS

Normal Status

If VODL<VDD<VOCU and VCH<VCSI<VOI1, M1 and M2 are both turned on (refer to Typical Application Circuits).

The charging and discharging processes can be operated normally.

Overcharge Detection

When enter charging from normal status, the battery voltage can be detected from VDD. When the battery is in

overcharge status, VDD is larger than VOCU over a delay time of TOC, M2 is to be turned off.

Release of Overcharge Status

There are two ways to return to normal status from overcharge status.

• If the battery is self discharging and VDD<VOCR occurs, M2 is to be turned on and back to normal status.

• Remove the charger and connected to a load. If VOCR<VDD<VOCU and VCSI>VOI1 occurs, M2 is to be turned

on and back to normal status.

Over discharge Detection

When enter discharging from normal status, the battery voltage can be detected from VDD. When the battery is

in over discharge status, 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 status.

Charger Detection

If a charger is connected to the battery remained in Power-down mode, the voltages will become VCSI<VCH

and VDD>VODL. M1 is to be turned on and back to normal status.

Abnormal Charging Status

If a charger is connected to the battery in normal status, 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 during discharging under normal status and the voltage detected

from CSI is larger than VOIX (VIO1 or VIO2) for over a certain delay time TOIX (TIO1 or TIO2), it means the over

current/short current status occurred. M1 is turned off. CSI is pulled to VSS by way of an internal resistor RCSIS.

Release of Over Current/Short Current Status

While the protection IC remains in Over Current/Short Current status 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 status.

Note: when a battery is connected to a protection IC for the first time, the IC may not enter the normal status (not

dischargeable status). 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 status.

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