HY2120
2-Cell Lithium-ion/Lithium Polymer Battery Packs Protection ICs
charging and voltage of cell 1 and cell 2 goes higher than the overdischarge detection voltage
(VDLn).
(2) When CS pin voltage is equal to or higher than the charge overcurrent detection voltage (VCIP) by
charging and and voltage of cell 1 and cell 2 goes higher than the overdischarge release voltage
(VDRn).
(3) Without connecting a charger, if the voltage of cell 1 and cell 2 goes higher than overdischarge
release voltage (VDRn), the overdischarge status will be released, namely Auto Overdischarge
Recovery Function.
Notice：
① When voltage of cell 1 and cell 2 lowers than overdischarge detection voltage (VDLn) and stayed
within overdischarge detection delay time (TOD), the voltage of cell 1 and cell 2 increases higher
than overdischarge detection voltage (VDLn), it will not enter into overdischarge protection mode.
② The output type of OD pin is having "H" level of VDD and "L" level of VSS.
11.4.Discharge Overcurrent Status (Discharge Overcurrent & Short Circuit)
The IC continuously monitor discharge current by examining CS pin voltage when batteries under
normal operation. Once the voltage of CS pin exceeds that of discharge overcurrent detection
.
voltage (VDIP) and this status lasts longer than discharge overcurrent delay time (TDIP), and voltage
output of OD pin changes from high potential to low potential, the MOSFET (OD pin) is disabled and
discharge stopped. This status is called “Discharge Over-current Status”.
When CS pin voltage excels short circuit detection voltage (VSIP) and this status lasts longer than
short circuit delay tome (TSIP), voltage output of OD pin changes from high potential to low potential.
At this time, the MOSFET (OD pin) is disabled and discharge stopped. This status is called “Short
Circuit Status”.
Discharge over-current status and short current status is released while the connected impedance
between PB+ and PB- is larger than 450kΩ (typ.).
Additionally, when charger is connected, even the impedance between PB+ and PB- lowers than
450kΩ (typ.) and CS pin voltage lowers than discharge overcurrent detection voltage (VDIP), the
discharge over-current status or short circuit status will still be released and back to normal
operation mode.
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