1

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FN8246.0

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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X3102

3 Cell Li-Ion Battery Protection and

Monitor IC

The X3102 is a protection and monitor IC for use in battery

packs consisting of 3 series Lithium-Ion battery cells. The

device provides 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 overcurrent 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 X3102 allows

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 X3102 contains 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 X3102 is housed in a 28 Pin TSSOP package.

Pinout

X3102 (TSSOP)

TOP VIEW

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

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

VCC

RGP

RGC

RGO

VCELL1

CB1

VCELL2

CB2

1

2

3

4

28

27

26

25

UVP/OCP

OVP/LMON

CS

SCK

VCELL3

CB3

VSS

NC

5

6

7

8

24

23

22

21

SO

SI

AS2

AS1

VSS

VCS1

VCS2

OVT

9

10

11

12

20

19

18

17

AS0

AO

UVT

OCT

13

14

16

15

Ordering Information

PART

NUMBER

TEMP. RANGE

(°C)

PACKAGE

X3102V28

6V to 24V

-20 to +70

28 Ld TSSOP

Data Sheet

December 22, 2004