SC121 SILAN [Silan Microelectronics Joint-stock], SC121 Datasheet - Page 4

• Manufacturer Part Number: SC121
• Description: LI+ BATTERY PROTECTION CIRCUIT
• Manufacturer: SILAN [Silan Microelectronics Joint-stock]

FUNCTION DESCRIPTIONS
Normal Status
The charging and discharging processes can be operated normally.
Overcharge Detection
overcharge status, V
Release of Overcharge Status
Over discharge Detection
in over discharge status, V
meanwhile, CSI is pulled to V
Power-down mode. (Its current consumption is lower than 0.3 A).
Release of Power-down mode
occur, M1 is still off but it releases Power-down mode. If V
normal status.
Charger Detection
and V
Abnormal Charging Status
M2 is to be turned off.
Over Current/Short Current Detection
from CSI is larger than V
current/short current status occurred. M1 is turned off. CSI is pulled to V
Release of Over Current/Short Current Status
between V
Note: when a battery is connected to a protection IC for the first time, the IC may not enter the normal status (not
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When enter charging from normal status, the battery voltage can be detected from V
There are two ways to return to normal status from overcharge status.
When enter discharging from normal status, the battery voltage can be detected from V
If V
If a charger is connected to the battery remained in Power-down mode, the voltages will become V
If a charger is connected to the battery in normal status, V
When the discharging current is too large during discharging under normal status and the voltage detected
While the protection IC remains in Over Current/Short Current status and load is removed or the impedance
on and back to normal status.
A charger is connected while the battery remains in Power-down mode. If V
If the battery is self discharging and V
Remove the charger and connected to a load. If V
ODL
DD
dischargeable status). If this occurs, set the CSI pin voltage equal to the V
V
SS
>V
<V
BAT
ODL
pins or connect a charger) to enter the normal status.
DD
+ and V
<V
. M1 is to be turned on and back to normal status.
OCU
DD
BAT
and V
is larger than V
OIX
- is larger than 500K and V
DD
CH
(V
DD
<V
is smaller than V
IO1
CSI
by way of internal resistor RCSID. If V
or V
<V
OCU
OI1
IO2
DD
, M1 and M2 are both turned on (refer to Typical Application Circuits).
) for over a certain delay time T
<V
over a delay time of T
OCR
ODL
occurs, M2 is to be turned on and back to normal status.
OCR
over a delay time of TOD; M1 is to be turned off. In the
CSI
<V
<V
DD
CSI
DD
OI1
>V
<V
<V
, M1 is to be turned on and back to normal status.
ODR
OC
OCU
CH
occurs, M1 is to be turned on and back to
, M2 is to be turned off.
occurs over a delay time longer than TOC,
and V
SS
CS
by way of an internal resistor RCSIS.
OIX
I>V
CSI
CH
>V
OI2
(T
SS
<V
IO1
OI1
, the protection IC enters into
CSI
voltage (short the CSI and
or T
DD
occurs, M2 is to be turned
<V
. When the battery is in
DD
OI2
REV:1.6
IO2
. When the battery is
), it means the over
and V
DD
CSI
Page 4 of 9
SC121
<V
2009.07.20
<V
ODR
CH