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, over-discharge, and overcurrent 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 4k-bit 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 Ld TSSOP

package.

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 4k-bit EEPROM

• Flexible Power Management with 1µA Sleep Mode

• Cell Balancing Control

• Pb-Free Available (RoHS Compliant)

Benefit

• Optimize protection for chosen cells to allow maximum

use of pack capacity

• Reduce component count and cost

• Simplify implementation of gas gauge

• Accurate voltage and current measurements

• Record battery history to optimize gas gauge, track pack

failures and monitor system use

• Reduce power to extend battery life

• Increase battery capacity and improve cycle life battery life