DS2784
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DS2784

1-Cell Fuel Gauge with FuelPack, Protector, and SHA-1 Authentication

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Industry's First Complete Fuel Gauge Solution to Integrate a 1-Cell Li+ Protector and SHA-1 Authentication System

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file View Data Sheet (Rev.5)
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1ku List Price Starting From $5.19
Features
  • Precision Voltage, Temperature, and Current Measurement System
  • Available Capacity Estimated from Coulomb Count, Discharge Rate, Temperature, and Cell Characteristics
  • Estimates Cell Aging Using Learn Cycles
  • Uses Low-Cost Sense Resistor
  • Allows for Calibration of Gain and Temperature Coefficient
  • Li+ Safety Circuitry—Overvoltage, Undervoltage, Overcurrent, Short-Circuit Protection
  • Programmable Safety Thresholds for Overvoltage and Overcurrent
  • Authentication Using SHA-1 Algorithm and 64-Bit Secret
  • 32-Byte Parameter EEPROM
  • 16-Byte User EEPROM
  • Dallas 1-Wire Interface with 64-Bit Unique ID
  • Tiny, Pb-Free, 14-Pin TDFN Package Embeds Easily in Battery Packs Using Thin Prismatic Cells
Additional Details
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The DS2784 operates from 2.5V to 4.6V for integration in battery packs using a single lithium-ion (Li+) or Li+ polymer cell. Available capacity is reported in mAh and as a percentage. Safe operation is ensured with the included Li+ protection function and SHA-1-based challenge-response authentication.

Precision measurements of voltage, temperature, and current, along with cell characteristics and application parameters are used to estimate capacity. The available capacity registers report a conservative estimate of the amount of charge that can be removed given the current temperature and discharge rate.

In addition to the nonvolatile (NV) storage for cell compensation and application parameters, 16 bytes of EEPROM memory is made available for the exclusive use of the host system and/or pack manufacturer. This facilitates battery lot and date tracking or NV storage of system or battery usage statistics.

A 1-Wire® interface provides serial communication at 16kbps or 143kbps to access data registers, control registers, and user memory. Additionally, 1-Wire communication enables challenge-response pack authentication using SHA-1 as the hash algorithm in a hash-based message authentication code (HMAC) authentication protocol.

Applications

  • Digital Still, Video, and Action Cameras
  • Handheld Computers and Terminals
  • Handheld Radios
  • Health and Fitness Monitors
  • Home and Building Automation, Sensors
  • Medical Devices
  • Power Tools
  • Smart Batteries
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file View Data Sheet (Rev.5)
Documentation View All Documentation
Part Models 2
1ku List Price Starting From $5.19
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DS2784

Documentation

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Data Sheet

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UPDATED 03/27/2017
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DS2784: 1-Cell Fuel Gauge with FuelPack, Protector, and SHA-1 Authentication Data Sheet (Rev.5)

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UPDATED 12/13/2007
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DS2784: 独立式、单节电池电量计IC，带有Li+电池保护和SHA-1认证 Data Sheet (Rev.2)

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Reliability Data

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UPDATED 01/12/2023
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DS2784 Reliability Data redirect icon

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Design Note

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UPDATED 03/26/2008
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Adding Thermal Protection to the DS2784 Stand-Alone Fuel Gauge redirect icon

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UPDATED 07/28/2008
Chinese
为DS2784独立式电量计添加热保护功能 redirect icon

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UPDATED 07/22/2008
Japanese
DS2784スタンドアロン残量ゲージへの過熱保護の追加 redirect icon

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UPDATED 09/11/2007
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Calibrating RSGAIN for the DS278x Family of Fuel Gauges redirect icon

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UPDATED 01/25/2008
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DS278x系列电量计中的RSGAIN校准 redirect icon

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UPDATED 02/20/2008
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DS278x残量ゲージICファミリのRSGAINの較正 redirect icon

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UPDATED 07/18/2007
English
Understanding the DS2784's Undervoltage-Protection Delay (tUVD) redirect icon

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UPDATED 10/19/2007
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理解DS2784的欠压保护延时(tUVD) redirect icon

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UPDATED 10/16/2007
Japanese
DS2784の低電圧保護遅延(tUVD)の理解 redirect icon

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UPDATED 05/07/2008
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Protection Circuitry for Reversed Charger Connections to the DS2784 High-Side nFET Protector redirect icon

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UPDATED 08/04/2008
Chinese
充电器反接时，DS2784高边nFET保护器的保护电路 redirect icon

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UPDATED 07/29/2008
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DS2784ハイサイドnFETプロテクタのチャージャ逆接続保護回路 redirect icon

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Documentation

Documentation

Technical Documents 6
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Data Sheet 1

DS2784: 1-Cell Fuel Gauge with FuelPack, Protector, and SHA-1 Authentication Data Sheet (Rev.5)

Reliability Data 1

DS2784 Reliability Data

Design Note 4

Adding Thermal Protection to the DS2784 Stand-Alone Fuel Gauge
Calibrating RSGAIN for the DS278x Family of Fuel Gauges
Understanding the DS2784's Undervoltage-Protection Delay (tUVD)
Protection Circuitry for Reversed Charger Connections to the DS2784 High-Side nFET Protector

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
DS2784G+ Thin Dual Flatpack No Leads external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
DS2784G+T&R Thin Dual Flatpack No Leads external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

DS2784EVKIT

Evaluation Kit for the DS2784

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DS2784EVKIT

Evaluation Kit for the DS2784

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DS2784EVKIT
Evaluation Kit for the DS2784

Features and Benefits

  • Demonstrates the Capabilities of the DS2784 Including:
    • Estimation of Available Capacity for Li+ Cells
    • Voltage Measurement
    • Current Measurement
    • Current Accumulation
    • Temperature Measurement
    • Information Storage
    • Identification
    • Overvoltage/Undervoltage Protection
    • Overcurrent/Short-Circuit Protection
    • Secure Challenge and Response Authentication Using the SHA-1 Algorithm
  • Interfaces to the USB Port of a PC Running Windows XP or Older OS That Supports USB Operation
Buy Now View Details

Product Detail

The DS2784 evaluation kit (EV kit) allows easy performance evaluation, software development, and prototyping with the DS2784 1-cell stand-alone fuel gauge IC with Li-Ion (Li+) protector and SHA-1 authentication. The evaluation board interfaces to a PC through a DS9123O USB adapter and RJ-11 cable connection. The provided CD-ROM contains all related data sheets along with the evaluation software, which can be run under Windows XP® or older operating system that supports USB operation.

The DS2784 EV kit evaluation software gives the user complete control of all the DS2784 functions. Separate control tabs allow the user access to all EEPROM and RAM memory locations, control registers, real-time updates of all monitored parameters, and SHA-1 functions. The software also incorporates a data-logging feature to monitor a cell over time.

The evaluation board circuit is designed to provide the DS2784 with accurate parameter measurements. Kit demonstration boards vary as they are improved upon over time.

Applications

  • Cordless VoIP Phones
  • Digital Still and Video Cameras
  • Portable GPS Navigation
  • Smartphones/PDAs

Evaluation Kits1

DS2784EVKIT

Evaluation Kit for the DS2784

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