Rainbow-electronics DS2778 Bedienungsanleitung PDF herunterladen (Seite 1)

General Description

The DS2775–DS2778 report available capacity for

rechargeable lithium-ion (Li+) and Li+ polymer (Li-Poly)

batteries in mAh and as a percentage of full. Safe oper-

ation is ensured by the integrated Li+ protector. The

DS2776/DS2778 support SHA-1-based challenge-

response authentication in addition to all other DS2775/

DS2777 features.

Precision measurements of voltage, temperature, and

current, along with a cell characteristics table and

application parameters, are used for capacity estima-

tion calculations. The capacity registers report a con-

servative estimate of the amount of charge that can be

removed given the current temperature, discharge rate,

stored charge, and application parameters.

The DS2775–DS2778 operate from +4.0V to +9.2V for

direct integration into battery packs with two Li+ or Li-

Poly cells.

In addition to nonvolatile storage for cell compensation

and application parameters, the DS2775–DS2778 offer

16 bytes of EEPROM for use by the host system and/or

pack manufacturer to store battery lot and date tracking

information. The EEPROM can also be used for non-

volatile storage of system and/or battery usage statis-

tics. A Maxim 1-Wire

(DS2775/DS2776) or 2-wire

(DS2777/DS2778) interface provides serial communica-

tion to access measurement and capacity data regis-

ters, control registers, and user memory. The

DS2776/DS2778 use the SHA-1 hash algorithm in a

challenge-response pack authentication protocol for

battery-pack verification.

Applications

Low-Cost Notebooks

UMPCs

DSLR Cameras

Video Cameras

Commercial and Military Radios

Portable Medical Equipment

Features

♦ High-Side nFET Drivers and Protection Circuitry

♦ Precision Voltage, Temperature, and Current

Measurement System

♦ Cell-Capacity Estimation from Coulomb Count,

Discharge Rate, Temperature, and Cell

Characteristics

♦ Estimates Cell Aging Between Learn Cycles

♦ Uses Low-Cost Sense Resistor

♦ Allows Calibration of Gain and Temperature

Coefficient

♦ Programmable Thresholds for Overvoltage and

Overcurrent

♦ Pack Authentication Using SHA-1 Algorithm

(DS2776/DS2778)

♦ 32-Byte Parameter EEPROM

♦ 16-Byte User EEPROM

♦ Maxim 1-Wire Interface with 64-Bit Unique ID

(DS2775/DS2776)

♦ 2-Wire Interface with 64-Bit Unique ID

(DS2777/DS2778)

♦ 3mm x 5mm, 14-pin TDFN Lead-Free Package

DS2775/DS2776/DS2777/DS2778

2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with

Protector and Optional SHA-1 Authentication

________________________________________________________________

Maxim Integrated Products

Ordering Information

Rev 1; 3/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

PART PIN-PACKAGE TOP MARK

DS2775G+ 14 TDFN-EP* D2775

DS2775G+T&R 14 TDFN-EP* D2775

DS2776G+ 14 TDFN-EP* D2776

DS776G+T&R 14 TDFN-EP* D2776

DS2777G+ 14 TDFN-EP* D2777

DS2777G+T&R 14 TDFN-EP* D2777

DS2778G+ 14 TDFN-EP* D2778

DS2778G+T&R 14 TDFN-EP* D2778

Note: All devices are specified over the -20°C to +70°C oper-

ating temperature range.

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

T&R = Tape and reel.

EP = Exposed pad.

Selector Guide and Pin Configuration appear at end of data

sheet.

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

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DS2775/DS2776/DS2777/DS2778 1

Inhaltsverzeichnis

Seite 1 - DS2775/DS2776/DS2777/DS2778

General DescriptionThe DS2775–DS2778 report available capacity forrechargeable lithium-ion (Li+) and Li+ polymer (Li-Poly)batteries in mAh and as a pe

Seite 2

Detailed DescriptionThe DS2775–DS2778 function as an accurate fuelgauge, Li+ protector, and SHA-1-based authenticationtoken (SHA-1-based authenticatio

Seite 3