ISL942x Family of Battery Monitors

The Renesas ISL942x family of Li-ion battery monitor ICs support anywhere from 3 to 12 series of connected battery cells. It provides full battery monitoring and pack control. The ISL94203 provides automatic shutdown and recovery from out of bounds conditions and automatically controls pack cell balancing. The ISL942x battery monitors support Li-ion CoO₂, Li-ion, Mn₂O₄, and Li-ion FePO₄ chemistries.

These battery monitors are highly configurable as stand-alone units but can be used with an external microcontroller, which communicates to the IC through an I²C interface. ISL942x devices also offer programmable detection/recovery times for overvoltage, undervoltage, overcurrent, and short-circuit conditions as well as open battery detection. The rich feature set of the ISL92x family of battery monitor ICs makes them suitable for wearables, power tools, battery backup systems, and IoT applications.

Features

• Eight cell voltage monitors support Li-ion CoO₂, Li-ion Mn₂O₄, and Li-ion FePO₄ chemistries
• Stand-alone pack control - no microcontroller needed
• Multiple voltage protection options (each programmable to 4.8 V; 12-bit digital value) and selectable overcurrent protection levels
• Programmable detection/recovery times for overvoltage, undervoltage, overcurrent and short-circuit conditions
• Configuration/calibration registers maintained in EEPROM
• Open battery connect detection
• Integrated charge/discharge FET drive circuitry with built-in charge pump supports high-side N-channel FETs
• Cell balancing uses external FETs with internal state machine or external microcontroller
• Enters low power states after periods of inactivity. Charge or discharge current detection resumes normal scan rates