L9961数据手册ST中文资料规格书

描述 Description

The L9961 is part of a complete battery pack monitoring, balancing, and protection 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 over current (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.

特性 Features

• 2 μA SHIPMENT - DEEP SLEEP mode current and 5 μA Standby consumption (with VREG LDO active)
• Integrated 3.3 V VREG LDO for supplying MCU and LEDs
• Measures Cell Voltage (3 to 5 cells), with Over/Under voltage detection and Balance Under voltage protection
• 12-bit voltage measurement with maximum error of ± 15 mV in the [1.5 – 4.5] V range, for -40 °C
• 16-bit signed current measurement with maximum error of 0.25%, for -40 °C 2C peripheral for device programming and data transfers over I2C bus
• Cell balancing supporting up to 70 mA per cell
• Dual configurable HS/LS pre-driver for pack relay management
• Pack fuse management
• Embedded NVM for configuration parameters storage
• High hot plug robustness