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The X3100 is a protection and monitor IC for use in battery packs consisting of 4 series Lithium-Ion battery cells. The X3101 is designed to work in 3 cell applications. Both devices provide internal over-charge, overdischarge, and over-current protection circuitry, internal EEPROM memory, an internal voltage regulator, and internal drive circuitry for external FET devices that control cell charge, discharge, and cell voltage balancing.

Over-charge, over-discharge, and over-current thresholds reside in an internal EEPROM memory register and are selected independently via software using a 3MHz SPI serial interface. Detection and time-out delays can also be individually varied using external capacitors.

Using an internal analog multiplexer, the X3100 or X3101 allow battery parameters such as cell voltage and current (using a sense resistor) to be monitored externally by a separate microcontroller with A/D converter. Software on this microcontroller implements gas gauge and cell balancing functionality in software.

The X3100 and X3101 contain a current sense amplifier. Selectable gains of 10, 25, 80 and 160 allow an external 10 bit A/D converter to achieve better resolution than a more expensive 14 bit converter.

An internal 4kbit EEPROM memory featuring IDLock™, allows the designer to partition and "lock in" written battery cell/pack data.

The X3100 and X3101 are each housed in a 28 Pin TSSOP package.

Key Features

• Software Selectable Protection Levels and Variable Protect Detection/Release Times
• Integrated FET Drive Circuitry
• Cell Voltage and Current Monitoring
• 0.5% Accurate Voltage Regulator
• Integrated 4kbit EEPROM
• Flexible Power Management with 1µA Sleep Mode
• Cell Balancing Control