bq2058T

Notes: 1Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional oper at ions hould belimited to the Recommended DC Operating Conditions detailedin this datas heet. Exposure to cond itions beyond the opera tional limits for extended periods of time may affect device reliability.
2.Internal protection diodes are in place on every pinrelative to V_CCand V _SS .See picture below.

The bq2058T Lithium Ion Pack Su- pervisor is designed to control the charge and discharge cell voltage lim- its for two lithium-ion (Li-Ion)series cells,accommodating battery packs containing series/parallel configura- tions.The low operating current does  not overdischarge the cells during pe- riods ofstorage and does not signifi- cantly increase the system discharge load.The bq2058T can be part of a low-costLi-Ion charge control system within the battery pack.

The bq2058T controls two external FETs to limit the charge and discharge potentials.The bq2058T allows charg- ing when each indvidual cell voltage isbelow V_OV (overvoltagelimit).If the voltage on any cellexceeds V_OV for a user-configurable delay period(t_OVD  ),the open-drain CHG pin goes to the high-impedance state,shutting off charge to the battery pack.This safety feature prevents overcharge of any cell within the battery pack.After an over- voltage conditiono ccurs,each cell must fall belowV_CE(chargeenablevoltage) for the bq2058T to re-enablecharging.

The bq2058T protects batteries from overdischarge.If the voltage on any cellfallsbelow V_UV (undervoltage limit) for  user-configurable delay pe-riod(tUVD ),the DSG output is driven low,shutting off thebattery discharge.This safety  eature prevents overdis- charge of any cell with inthe batterypack.

The bq2058T also stops discharge on detection of an overcurrent condition, such as a short circuit.If an overcur- rent conditiono ccurs for a user-configurable delay period (t_OCD ), the DSG output is drivenlow,disconnect- ing the load from  he pack.DSG re- mains low until removal of the short circuit or overcurrent condition.