19-4633; 5/09

DS2756

High-Accuracy Battery Fuel Gauge

with Programmable Suspend Mode

1 of 27

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

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GENERAL DESCRIPTION

The DS2756 high-precision battery fuel gauge is a

data-acquisition

and

information-storage

device

tailored for cost-sensitive and space-constrained 1-

cell Li+/polymer battery-pack applications. The

DS2756 provides the key hardware components

required to accurately estimate remaining capacity by

integrating low-power, precision measurements of

temperature,

voltage,

current,

and

current

accumulation, as well as nonvolatile (NV) data

storage, into the small footprint of a 3.0mm x 4.4mm

8-pin TSSOP package.

Through its 1-Wire

 interface, the DS2756 gives the

host system read/write access to status and control

registers, instrumentation registers, and general-

purpose data storage. Each device has a unique

factory-programmed 64-bit net address that allows it

to be individually addressed by the host system,

supporting multibattery operation.

TYPICAL OPERATING CIRCUIT

FEATURES



Programmable Suspend Mode



Accurate Current Accumulation

- 2% ±4

V over ±64mV Input Range

- 2% ±200

A over ±3.2A with 20m Sense



Current Measurement

- 9-Bit Snapshot Measurement

- 12-Bit Average Updated Every 88ms

- 15-Bit Average Updated Every 2.8s



Voltage Measurement

- 9-Bit Snapshot Measurement

- 10-Bit Average Updated Every 4ms



Temperature Measurement

- 10-Bit with 0.125

C Resolution



Snapshot Mode Allows Instantaneous Power

Measurement



Host Alerted When Accumulated Current or

Temperature Exceeds Programmable Limits



96 Bytes of Lockable EEPROM



8 Bytes of General-Purpose SRAM



Dallas 1-Wire Interface with Unique 64-Bit

Address and Standard or Overdrive Timing



3mm Dimension of 8-Pin TSSOP Package

Allows Mounting on Side of Thin Prismatic

Li+ and Li+/Polymer Cells

ORDERING INFORMATION

PART

TEMP RANGE

PIN-PACKAGE

DS2756E+

-20°C to +70°C

8 TSSOP

DS2756E+T&R

-20°C to +70°C

DS2756E+ on

Tape-and-Reel

+ Denotes lead(Pb)-free/RoHS-compliant package.

PIN CONFIGURATION

DQ

SNS

IS2

PIO

1

2

2

1

8

7

6

5

2

3

4

IS1

DS2756E

TSSOP Package

1-Wire is a registered trademark of Maxim Integrated Products, Inc.