X3101 datasheet(2/40 Pages) XICOR

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X3100/X3101 – Preliminary Information

Characteristics subject to change without notice.

2 of 40

REV 1.1.8 12/10/02

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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

PIN NAMES

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.

VCC

RGP

RGC

RGO

VCELL1

CB1

VCELL2

CB2

28 Lead TSSOP

UVP/OCP

OVP/LMON

SCK

VCELL3

CB3

VCELL4/VSS*

CB4

X3100/

AS2

AS1

VSS

VCS1

VCS2

OVT

AS0

UVT

OCT

X3101

*For X3101, Connect to ground.

Symbol

Description

VCELL1 Battery cell 1 voltage input

CB1

Cell balancing FET control output 1

VCELL2 Battery cell 2 voltage

CB2

Cell balancing FET control output 2

VCELL3 Battery cell 3 voltage

CB3

Cell balancing FET control output 3

VCELL4/

VSS

Battery cell 4 voltage (X3100)

Ground (X3101)

CB4

Cell balancing FET control output 4

Ground

VCS1

Current sense voltage pin 1

VCS2

Current sense voltage pin 2

OVT

Over-charge detect/release time input

UVT

Over-discharge detect/release time input

OCT

Over-current detect/release time input

Analog multiplexer output

AS0

Analog output select pin 0

AS1

Analog output select pin 1

AS2

Analog output select pin 2

Serial data input

Serial data output

SCK

Serial data clock input

Chip select input pin

OVP/

LMON

Over-charge Voltage Protection output/

Load Monitor output

UVP/

OCP

Over-discharge protection output/

Over-current protection output

RGO

Voltage regulator output pin

RGC

Voltage regulator control pin

RGP

Voltage regulator protection pin

Power supply

X3101 Datasheet(PDF) 2 Page - Xicor Inc.

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