X3100 Datasheet, PDF (2/40 Pages) Xicor Inc. – 3 or 4 Cell Li-Ion Battery Protection and Monitor IC

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