X3100 Datasheet, PDF (1/40 Pages) Xicor Inc. – 3 or 4 Cell Li-Ion Battery Protection and Monitor IC

®
PRELIMINARY
Data Sheet
April 11, 2005
X3100, X3101
4 cell/3 cell
FN8110.0
3 or 4 Cell Li-Ion Battery Protection and
Monitor IC
FEATURE
• 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
DESCRIPTION
The X3100 is a protection and monitor IC for use in bat-
tery packs consisting of 4 series Lithium-Ion battery
cells. The X3101 is designed to work in 3 cell applica-
tions. 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 con-
trol cell charge, discharge, and cell voltage balancing.
Over-charge, over-discharge, and over-current thresh-
olds 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 con-
verter. Software on this microcontroller implements
gas gauge and cell balancing functionality in software.
The X3100 and X3101 contain a current sense ampli-
fier. Selectable gains of 10, 25, 80 and 160 allow an
external 10 bit A/D converter to achieve better resolu-
tion 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.
FUNCTIONAL DIAGRAM
VCC RGP RGC RGO
UVP/OCP OVP/LMON
VCELL1
CB1
VCELL2
CB2
VCELL3
CB3
VCELL4/VSS
CB4
Over-charge
Over-discharge
Protection
Sense
Circuits
Protection
Sample Rate
Timer
Over-current
Protection &
Current Sense
5VDC
Regulator
FET Control
Circuitry
Internal Voltage Regulator
Power-on reset &
Status Register
Protection Circuit
Timing Control
& Configuration
Configuration
Register
4 kbit
EEPROM
Control
Register
Analog
MUX
SPI
I/F
AS0
AS1
AS2
AO
S0
SCK
CS
SI
VSS
VCS1 VCS2 OVT UVT OCT
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.