The ISL94212 Li-ion battery manager IC supervises up to 12 series connected cells. The part provides accurate monitoring, cell balancing and extensive system diagnostics functions. Three cell balancing modes are provided: Manual Balancing mode, Timed Balancing mode and Auto Balance mode. The Auto Balance mode terminates balancing functions when a charge transfer value has been met. The ISL94212 communicates to a host microcontroller via an SPI interface and to other ISL94212 devices using a robust, proprietary, two-wire Daisy Chain system. The ISL94212 is offered in a 64 Ld TQFP package and is specified for an operational temperature range of -40°C to +85°C.


  • Up to 12-cell voltage monitors, support Li-Ion CoO2, Li-ion Mn2O4, and Li-ion FePO4 chemistries
  • Cell voltage measurement accuracy ±10mV
  • 13-bit cell voltage measurement
  • Pack voltage measurement accuracy ±180mV
  • 14-bit pack voltage and temperature measurements
  • Cell voltage scan rate of 19.5µs per cell (234µs to scan 12 cells)
  • Internal temperature monitoring
  • Up to four external temperature inputs
  • Robust daisy chain communications system
  • Integrated system diagnostics for all key internal functions
  • Hardwired and communications based fault notification
  • Integrated watchdog shuts down device if communication is lost
  • 7µA shutdown current: Enable = VSS
  • 2Mbps SPI


  • Hybrid, electric vehicle battery packs
  • Battery backup systems
  • E-Moto; E-Bike

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active TQFP Tray 160
Active TQFP Reel 1000

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL94212 Datasheet Datasheet PDF 4.46 MB
User Guides & Manuals
ISL94212EVKIT1Z User Guide Manual PDF 3.54 MB
Application Notes & White Papers
Low-Side FET White Paper 简体中文 White Paper PDF 263 KB
Putting Safety into Li-ion Battery Packs 简体中文 White Paper PDF 451 KB
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
Battery Management System Tutorial 简体中文 White Paper PDF 451 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
PCN15007 - This notice is to advise our customers of a minor silicon design revision Product Change Notice PDF 233 KB
PCN14006 - Test Site Change for the Listed Intersil Products Product Change Notice PDF 168 KB
Analog ICs Brochure 日本語 Brochure PDF 4.20 MB
Industrial Power Management Brochure ( R16CL0001EJ0200 ) 日本語 Brochure PDF 3.13 MB
ISL94212EVKIT1Z Kit Installer Software v3.0.1 Library EXE 2.94 MB

Boards & Kits

Part Number Title Type Company
ISL94212EVKIT1Z Multi-Cell Li-Ion Battery Manager Evaluation Kit Evaluation Renesas