ISL94212

Multi-Cell Li-Ion Battery Manager

Product Status: Mass Production

OVERVIEW

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.

KEY FEATURES

  • 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

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL94212
Basic Information
Production Status
Mass Production
# Series Cells
6 to 12 Cells
Communication Interface
SPI and Proprietary Asynchronous
Implementation
Pack
Cell Balancing
External (Built-in FET Drivers)
Pack Voltage
up to 63V per Device
Absolute Cell Voltage Measurement Accuracy
10mV Max (0°C to 50°C)
Integrated Charge/Discharge FET Drive
No
Integrated Current Sense/Detection
No
Integrated Temperature Sense
Yes
IS (max)
5 mA
SHDN ICC
(typ) 1.2 µA
Integrated Regulator Output/Reference Output
3.3V / 2.5V
Special Features
*Daisy Chain up to 14 devices (168 Cells)
*Robust Hot Plug Performance
*Provides Diagnostic Information
*Fast Scan Rate of 20µs/cell
Package
64Ld TQFP (10x10mm)
Qualification Level
Standard
Can Sample
YES
Temperature Range
-40 to +85

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