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X3100 Datasheet, PDF (1/40 Pages) Xicor Inc. – 3 or 4 Cell Li-Ion Battery Protection and Monitor IC | |||
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APPLICATION NOTE
A V A I LABLE
3 or 4 Cell Li-Ion BATTERY PACKS
PPrreelliimmiinnaarryy Information
X3100/X3101
4 cell / 3 cell
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
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
ampliï¬er. 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
IDLockâ¢, allows the designer to partition and âlock inâ
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
& Conï¬guration
Conï¬guration
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
REV 1.1.8 12/10/02
www.xicor.com
Characteristics subject to change without notice. 1 of 40
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