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.

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

Applications
• Light electric vehicle (LEV); E-Moto; E-Bike
• Battery backup systems; Energy Storage Systems (ESS)
• Solar Farms
• Portable and semi-portable equipment