ds2786 Maxim Integrated Products, Inc., ds2786 Datasheet

ds2786

Manufacturer Part Number

ds2786

Description

Ds2786 Standalone Ocv-based Fuel Gauge

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.DS2786.pdf (22 pages)

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Download datasheet (342Kb)

Commands, Registers, and Modes are capitalized for clarity.

GENERAL DESCRIPTION

The

rechargeable Li-Ion and Li-Ion Polymer batteries

based on the cell voltage in the open-circuit state

following a relaxation period. The open-circuit voltage

(OCV) is used to determine relative cell capacity

based on a lookup table stored in the IC. This

capability makes accurate capacity information

available immediately after a battery pack is inserted.

During periods of moderate to high rate discharging,

which preclude OCV measurements, the DS2786

uses coulomb counting as a secondary means of

estimating relative capacity.

Remaining capacity is reported in percent, along with

cell voltage, current and temperature information.

Cell characteristics and application parameters used

in the calculations are stored in on-chip EEPROM.

The DS2786 is intended for use on the host side of

portable devices, though it can also be mounted

within a battery pack. Measurement and estimated

capacity data are accessed through an I

Temperature data is available from an on-die sensor.

Resistance measurements of a pack identification

resistor and pack thermistor are supported by

ratiometric measurements on two auxiliary inputs.

APPLICATIONS

TYPICAL OPERATING CIRCUIT

www.maxim-ic.com

3G Multimedia Wireless Handsets

Digital Still Cameras

Digital Audio (MP3) Players

DS2786

estimates

available

capacity

C interface.

for

1 of 22

Standalone OCV-Based Fuel Gauge

FEATURES

ORDERING INFORMATION

+ Denotes lead-free package.

PIN CONFIGURATION

DS2786G+

DS2786G+T&R

Relative Capacity Calculated from

Combination Coulomb Counter and Open-

Circuit Cell Voltage (OCV) Battery Model

Accurate Warning of Low Battery Conditions

Even On First Cycle (No Learn Cycle Needed)

12-Bit Battery Voltage Measurement:

11-Bit Bidirectional Current Measurement:

Current Accumulation Measurement

Resolution:

Internal Temperature Measurement:

Two 11-Bit Aux Input Voltage Measurements:

Current Consumption

2-Wire Interface

Low Power Consumption:

OUT

PART

±10mV Accuracy

1.22mV LSB, 0V to 5V Input Range

25μV LSB, ±51.2mV Dynamic Range

1.67mA LSB, ±3.4A (R

±204.8mVh Range

±13.65Ah (R

0.125°C LSB, ±3°C Accuracy

±8 LSB Accuracy, Ratiometric Inputs

Eliminate Supply Accuracy Issues

Active Current: 50μA typ, 80μA max

Sleep Current: 1μA typ, 3μA max

Pin Drives Resistive Dividers, Reduces

3mm x 3mm TDFN-10

TEMP RANGE

-20ºC to +70ºC

SNS

Top View

= 15mΩ)

SNS

10-pin 3mm×3mm

TDFN

DS2786G+ in

Tape-and-Reel

= 15mΩ)

PIN-PACKAGE

DS2786

030708

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