1
FN8110.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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X3100, X3101
4 Cell/3 Cell
3 or 4 Cell Li-ion Battery Protection and
Monitor IC
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 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 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 1A 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
Functional Diagram
PROTECTION
CIRCUIT
TIMING CONTROL
AND
CONFIGURA
TION
OVT
UVT
OCT
FET CONTRO
L
CIRCUITRY
4k-BIT
EEPROM
ANALOG-
MUX
SPI
I/F
5VDC
REGULATOR
INTERNAL VOLTAGE
REGULATOR
POWER-ON RESET AND STATUS
REGISTER
VSS
VCELL1
CB1
VCC
RGP
OVP/LMON
UVP/OCP
AS0
AS1
AS2
AO
S0
SCK
CS
SI
CB3
CB2
CB4
VCELL2
VCELL3
VCELL4/VSS
PROTECTION
SAMPLE RATE
TIMER
RGC
RGO
CONFIGURATION
REGISTER
OVERCURRENT
PROTECTION
AND
CURRENT
SENSE
VCS1
VCS2
OVERCHARGE
OVERDISCHARGE
PROTECTION
SENSE
CIRCUITS
CONTROL
REGISTER
Data Sheet
January 3, 2008
NOT
RECO
MME
NDED
FOR
NEW
DESI
GNS
POSS
IBLE
SUBS
TITU
TE P
ROD
UCT
ISL92
08