Monitor IC. X3100 Datasheet

X3100 Datasheet PDF, Equivalent


Part Number

X3100

Description

3 or 4 Cell Li-Ion Battery Protection and Monitor IC

Manufacture

Xicor

Total Page 30 Pages
PDF Download
Download X3100 Datasheet PDF


X3100 Datasheet
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
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 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
REV 1.1.8 12/10/02
www.xicor.com
Characteristics subject to change without notice. 1 of 40

X3100 Datasheet
X3100/X3101 – Preliminary Information
PRINCIPLES OF OPERATION
The X3100 and X3101 provide two distinct levels of
functionality and battery cell protection:
First, in Normal mode, the device periodically checks
each cell for an over-charge and over-discharge state,
while continuously watching for a pack over-current
condition. A protection mode violation results from an
over-charge, over-discharge, or over-current state. The
thresholds for these states are selected by the user
through software. When one of these conditions occur, a
Discharge FET or a Charge FET or both FETs are
turned off to protect the battery pack. In an over-
discharge condition, the X3100 and X3101 devices go
into a low power sleep mode to conserve battery power.
During sleep, the voltage regulator turns off, removing
power from the microcontroller to further reduce pack
current.
Second, in Monitor mode, a microcontroller with A/D
converter measures battery cell voltage and pack current
via pin AO and the X3100 or X3101 on-board MUX. The
user can thus implement protection, charge/discharge,
cell balancing or gas gauge software algorithms to suit
the specific application and characteristics of the cells
used. While monitoring these voltages, all protection
circuits are on continuously.
In a typical application, the microcontroller is also
programmed to provide an SMBus interface along with
the Smart Battery System interface protocols. These
additions allow an X3100 or X3101 based module to
adhere to the latest industry battery pack standards.
PIN CONFIGURATION
VCELL1
CB1
VCELL2
CB2
VCELL3
CB3
VCELL4/VSS*
CB4
VSS
VCS1
VCS2
OVT
UVT
OCT
28 Lead TSSOP
1 28
2 27
3 26
4 25
5 24
6 23
X3100/
7 X3101 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
*For X3101, Connect to ground.
VCC
RGP
RGC
RGO
UVP/OCP
OVP/LMON
CS
SCK
SO
SI
AS2
AS1
AS0
AO
PIN NAMES
Pin Symbol
Description
1 VCELL1 Battery cell 1 voltage input
2 CB1 Cell balancing FET control output 1
3 VCELL2 Battery cell 2 voltage
4 CB2 Cell balancing FET control output 2
5 VCELL3 Battery cell 3 voltage
6 CB3 Cell balancing FET control output 3
7
VCELL4/ Battery cell 4 voltage (X3100)
VSS Ground (X3101)
8 CB4 Cell balancing FET control output 4
9 VSS Ground
10 VCS1 Current sense voltage pin 1
11 VCS2 Current sense voltage pin 2
12 OVT Over-charge detect/release time input
13 UVT Over-discharge detect/release time input
14 OCT Over-current detect/release time input
15 AO Analog multiplexer output
16 AS0 Analog output select pin 0
17 AS1 Analog output select pin 1
18 AS2 Analog output select pin 2
19 SI Serial data input
20 SO Serial data output
21 SCK Serial data clock input
22 CS Chip select input pin
23
OVP/ Over-charge Voltage Protection output/
LMON Load Monitor output
24
UVP/ Over-discharge protection output/
OCP Over-current protection output
25 RGO Voltage regulator output pin
26 RGC Voltage regulator control pin
27 RGP Voltage regulator protection pin
28 VCC Power supply
PIN DESCRIPTIONS
Battery Cell Voltage (VCELL1-VCELL4):
These pins are used to monitor the voltage of each
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 battery cells. For the X3101 device connect the
VCELL4/VSS pin to ground.
REV 1.1.8 12/10/02
www.xicor.com
Characteristics subject to change without notice. 2 of 40


Features Datasheet pdf APPLICATION NOTE A V A I L A B L E 3 or 4 Cell Li-Ion BATTERY PACKS Prelimina ry Information Preliminary X3100/X3101 FEATURE • Software Selectable Protec tion Levels and Variable Protect Detect ion/Release Times • Integrated FET Dr ive Circuitry • Cell Voltage and Curr ent Monitoring • 0.5% Accurate Voltag e Regulator • Integrated 4kbit EEPROM • Flexible Power Management with 1µ A Sleep Mode • Cell Balancing Control BENEFIT 4 cell / 3 cell 3 or 4 Cell Li-Ion Battery Protection and Monitor I C • Optimize protection for chosen ce lls to allow maximum use of pack capaci ty. • Reduce component count and cost • Simplify implementation of gas gau ge • Accurate voltage and current mea surements • Record battery history to optimize gas gauge, track pack failure s and monitor system use • Reduce pow er to extend battery life • Increase battery capacity and improve cycle life battery life Using an internal analog multiplexer, the X3100 or X3101 allow battery parameters such as cell voltage and current (u.
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