1

®

FN9074.0

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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ISL6295

Low Voltage Fuel Gauge

The ISL6295 is a cost-effective, highly accurate IC that

measures, stores, and reports all of the critical parameters

required for rechargeable battery monitoring with a minimum

of external components. It precisely measures charge/

discharge current as well as voltage and temperature of a

battery pack. In addition, the ISL6295 accurately

accumulates both charge and discharge current as

independent parameters. Temperature history can also be

maintained for calculating self-discharge effects.

The ISL6295 integrates a highly accurate 16-bit (15-bit plus

sign) integrating A/D converter that performs calibrated

current measurement to within ±0.5% error. On-chip

counters precisely track battery charge/discharge and

temperature history. Also included are an on-chip voltage

regulation circuit, non-crystal time base, and on-chip

temperature sensor. The operating voltage range of the

ISL6295 is optimized to allow a direct interface to a single

cell Li-Ion/Li-Poly pack. 256 bytes of general-purpose

nonvolatile EEPROM storage are provided to store factory

programmed, measured, and user defined parameters.

Efficient communication is provided through an industry

interface. This interface allows the host to determine

accurate battery status for effective system power

management and for communication to the end user. A

battery management solution utilizing the ISL6295 delivers

both space and total system component cost savings for a

wide variety of battery operated applications.

Features

• Measures, maintains, and reports all critical rechargeable

battery parameters with high accuracy

• Supports Lithium Ion and Lithium Polymer battery packs

• Current measurement with 16-bit (15-bit plus sign)

integrating A/D accurate to less than ±0.5% error

• Calibrated temperature measurement accurate to within

±3°C absolute using on-chip temp sensor or external

thermistor

• Accumulation of charge current, discharge current,

temperature, and voltage in independent 32-bit registers

• 256-byte nonvolatile EEPROM stores factory

programmed, measured, and user-defined parameters

• In-system offset calibration compensates for offset error in

current measurement

communications interface

- SMBus V1.1 with PEC/CRC-8 communication

• -20°C to +85°C operating temperature range

• NTC pin can be configured as a thermistor input or GPIO

• GPAD pin can be configured as an independent A/D input

or GPIO

• Flexible power operating modes allow low-power

monitoring of battery conditions during system full

operating and standby conditions:

- Run: Continuous Conversion; 85µA typ.

- Sample: Sample interval from 0.5-64s @ 45µA typ.

- Sample-Sleep: Sample interval from 0.5-138s min. @

20µA typ.

• Shelf-Sleep mode reduces power consumption to pack

storage conditions to 300nA typ., with automatic wake-up

upon pack insertion.

Applications

• Notebook PC, PDAs, Hand Held Devices

Pinout

ISL6295 (TSSOP)

TOP VIEW

Ordering Information

PART

NUMBER

PART

MARKING

TEMP

RANGE (°C)

PACKAGE

PKG.

DWG. #

ISL6295CV

6295CV

-20°C to 85 8 Ld TSSOP M8.173

ISL6295CV-T 6295CV

-20°C to 85 8 Ld TSSOP M8.173

1

2

3

45

6

7

8

GPAD/IO1

VP

SCL

SDA

SR

GND

NTC/IO0

ROSC

Data Sheet

October 25, 2005