The ISL9216 and ISL9217 chipset provides overcurrentprotection and voltage monitoring for multi-cell li-ion batterypacks consisting of 8 to 12 cells. When used together, thesedevices provide integrated overcurrent protection circuitry,short circuit protection, an internal voltage regulator, internalcell balancing switches, cell voltage level shifters, and drivecircuitry for external FET devices that control pack chargeand discharge. Level shifting of the analog output voltagefrom the upper cells and communication between the chipsis handled automatically.Overcurrent and short circuit thresholds reside in internalRAM registers and are selected independently via softwareusing an I2C serial interface. Detection and time-out delayscan be individually varied using internal registers.Using an internal analog multiplexer, the device providesmonitoring of cell voltage by a separate microcontroller withA/D converter. Software on this microcontroller implementsall battery control functionality, except for overcurrent and short circuit shutdown.
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