L9961 datasheet(2/65 Pages) STMICROELECTRONICS

2 / 65 page

Description

L9961 is part of a complete battery pack monitoring, balancing, and protecting

system for Li-Ion and Li-Polymer cells in 3, 4 or 5 series configurations. The L9961

uses a high precision ADC to provide cell voltage, stack voltage and temperature

conversion via external NTC. Voltage monitoring functions are cyclically performed

with a programmable loop time. Stack current is also monitored via a high accuracy

CSA, continuously running and performing also Coulomb counting. Cell balancing

is available and can be simultaneously activated on all cells. IC configuration and

information exchange for SOC/SOH estimation are performed via I2C peripheral. The

IC also integrates a dual pre-driver programmable in both HS/LS configurations for

driving pack relays. L9961 also implements battery pack fuse protection to prevent

fire and explosion hazards. A 3.3 V regulator with a high current capability is

available for supplying pack controller and other external circuitry in both standby and

normal operation modes. The IC protects the battery pack against over/under voltage

conditions and monitors for over/under temperature. It also features protection

against overcurrent (both directions) and short-circuit in discharge events. Safety-

relevant configurations can be stored in the internal NVM to avoid re-programming

the device at each wakeup.

L9961

DS14012 - Rev 3

page 2/65

L9961 Datasheet(PDF) 2 Page - STMicroelectronics