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 monito r IC for use in battery
packs consisting of 4 series Lithium-Ion battery cells. The
X3101 is designed to wo rk in 3-cell applications . Both devices
provide internal over-charge, over-discharge, and ove r-
current protection circuitry, internal EEPROM memory, an
internal volt age 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 multiple xer, the X3100 or X3101
allow battery parameters such as cell voltage and current
(using a sense resistor) to be moni tored 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 converte r.
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 ar e 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 ma ximum
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
CONFIGURATION
OVT UVT O CT
FET CONTROL
CIRCUITRY
4k-BIT
EEPROM
ANALOG-
MUX
SPI
I/F
5VDC
REGULATOR
INTERNAL VOLT AGE
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
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FN8110.1
January 3, 2008
Pinout
X3100, X3101
(28 LD TSSOP)
TOP VIEW
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VCELL1
CB1
VCELL2
CB2
VCELL3
CB3
VCELL4/VSS*
CB4
VSS
VCS1
VCS2
OVT
UVT
OCT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
VCC
RGC
RGO
UVP/OCP
OVP/LMON
SCK
SI
AS2
AS1
AS0
AO
RGP
CS
SO
*For X3101, Connect to GND
Ordering Information
PART
NUMBER*
PART
MARKING
V
CC
LIMITS
(V)
TEMP. RANGE
(°C) PACKAGE
PKG.
DWG. #
X3100V28* X3100V 6 to 24 -20 to +70 28 Ld TSSOP M28.173
X3100V28I X3100V I 6 to 24 -20 to +70 28 Ld TSSOP M28.173
X3100V28Z
(Note)
X3100VZ 6 to 24 -20 to +70 28 Ld TSSOP
(Pb-free)
M28.173
X3101V28* X3101V 6 to 24 -20 to +70 28 Ld TSSOP M28.173
X3101V28Z
(Note)
X3101VZ 6 to 24 -20 to +70 28 Ld TSSOP
(Pb-free)
M28.173
**Add “-T1” or “T2” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are
MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
Pin Descriptions
PIN
NUMBER PIN NAME BRIEF DESCRIPTION
1 VCELL1 Battery cell 1 voltage input. This pin is used to monitor the voltage of this battery cell internally.
The voltage of an individual cell can also be monitored externally at pin AO.
The X3100 monitors 4 battery cells. The X3101 monitors 3 ba ttery cells.
2CB1Cell balancing FET control output 1. This output is used to switch an external FET in order to
perform cell voltage balancing control. This function can be used to adjust an individual cell voltage
(e.g. during cell charging). CB1 can be driven hig h ( V c c ) o r l o w ( V s s ) to s w i t c h the e x t e rn al FE T
ON/OFF.
3 VCELL2 Battery cell 2 voltage. This pin is used to monitor the voltage of this battery cell internally. The voltage of an individual cell
can also be monitored externally at pin AO.
The X3100 monitors 4 battery cells. The X3101 monitors 3 ba ttery cells.
X3100, X3101