DS2761
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DS2761

High-Precision Li+ Battery Monitor

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1-wire battery monitor integrates single-cell protector

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Features
  • Lithium-Ion (Li+) Safety Circuit
    • Overvoltage Protection
    • Overcurrent/Short-Circuit Protection
    • Undervoltage Protection
  • Zero Volt Battery Recovery Charge
  • Available in Two Configurations:
    • Internal 25mΩ Sense Resistor
    • External User-Selectable Sense Resistor
  • Current Measurement
    • 12-Bit Bidirectional Measurement
    • Internal Sense Resistor Configuration: 0.625mA LSB and ±1.9A Dynamic Range
    • External Sense Resistor Configuration: 15.625µV LSB and ±64mV Dynamic Range
  • Current Accumulation:
    • Internal Sense Resistor: 0.25mAhr LSB
    • External Sense Resistor: 6.25µVhr LSB
  • Voltage Measurement with 4.88mV Resolution
  • Temperature Measurement Using Integrated Sensor with 0.125°C Resolution
  • System Power Management and Control Feature Support
  • 32 Bytes of Lockable EEPROM
  • 16 Bytes of General-Purpose SRAM
  • Dallas 1-Wire Interface with Unique 64-bit Device Address
  • Low Power Consumption:
    • Active Current: 60µA typ, 90µA max
    • Sleep Current: 1µA typ, 2µA max
Additional Details
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The DS2761 high-precision Li+ battery monitor is a data-acquisition, information-storage, and safety-protection device tailored for cost-sensitive battery pack applications. This low-power device integrates precise temperature, voltage, and current measurement, nonvolatile (NV) data storage, and Li+ protection into the small footprint of either a TSSOP package or flip-chip package. The DS2761 is a key component in applications including remaining capacity estimation, safety monitoring, and battery-specific data storage.

Through its 1-Wire® interface, the DS2761 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.

The DS2761 is capable of performing temperature, voltage, and current measurement to a resolution sufficient to support process monitoring applications such as battery charge control, remaining capacity estimation, and safety monitoring. Temperature is measured using an on-chip sensor, eliminating the need for a separate thermistor. Bidirectional current measurement and accumulation are accomplished using either an internal 25mΩ sense resistor or an external device. The DS2761 also features a programmable I/O pin that allows the host system to sense and control other electronics in the pack, including switches, vibration motors, speakers, and LEDs.

Three types of memory are provided on the DS2761 for battery information storage: EEPROM, lockable EEPROM, and SRAM. EEPROM memory saves important battery data in true NV memory that is unaffected by severe battery depletion, accidental shorts, or ESD events. Lockable EEPROM becomes ROM when locked to provide additional security for unchanging battery data. SRAM provides inexpensive storage for temporary data.

Applications

  • Cell Phones
  • Digital Still Cameras
  • Palmtops, Handy Terminals (incl. barcode)
  • Pen Entry Palmtops, PDAs and Organizers
  • Smart Battery Packs/Chargers
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DS2761

Documentation

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Data Sheet

3

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UPDATED 01/09/2006
English

DS2761: High-Precision Li+ Battery Monitor Data Sheet (Rev.2)

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UPDATED 01/01/1900
Chinese

DS2761: 高精度、Li+电池监测器 Data Sheet

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311.00K
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UPDATED 01/01/1900
Japanese

DS2761: 高精度Li+ (リチウムイオン)バッテリモニタ Data Sheet

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311.00K
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Reliability Data

1

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UPDATED 01/12/2023
English
DS2761 Reliability Data redirect icon

17.34K

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Design Note

10

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UPDATED 09/16/2003
English
DS27xx Fuel Gauge Board Layout Techniques to Minimize Measurement Error redirect icon

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UPDATED 04/23/2007
Chinese
DS27xx电量计电路板布局技巧，实现测量误差最小化 redirect icon

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UPDATED 03/09/2004
English
Powering up a DS2761 redirect icon

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UPDATED 04/26/2006
Japanese
測定誤差を最小限にするためのDS27xx残量計の基板レイアウト技術 redirect icon

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UPDATED 07/23/2004
Chinese
DS2761的上电状态 redirect icon

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UPDATED 09/09/2004
Japanese
DS2761の起動 redirect icon

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UPDATED 04/25/2005
Chinese
从DS2761升级到DS2762 redirect icon

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UPDATED 10/26/2009
Japanese
DS2761からDS2762へのアップグレード redirect icon

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UPDATED 05/04/2001
English
Using the DS2760 or DS2761 Battery Monitor in Multiple-Cell Applications redirect icon

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UPDATED 05/29/2003
English
Increasing The DS276X Battery Monitor and Protector ESD Protection Levels redirect icon

Application Note

3

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UPDATED 11/12/2004
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Maxim Wafer-Level Package Assembly Guide redirect icon

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UPDATED 01/04/2005
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Maxim晶片级封装安装指南 redirect icon

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UPDATED 03/28/2005
Japanese
マキシムのウェハレベルパッケージの実装ガイド redirect icon

Technical Articles

12

PDF Vector

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UPDATED 08/27/2002
English
Interfacing the DS2760 1-Wire High-Precision Li-Ion Battery Monitor and Protection IC in a Microcontroller Environment redirect icon

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UPDATED 05/29/2001
English
Testing and Calibrating a DS2760 Li-Ion Battery Monitor and Protector Based Circuit redirect icon

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UPDATED 07/18/2008
Chinese
消除对于电池电量计的误解—精确的电池监测可以提高无线手机和其他产品的性能 redirect icon

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UPDATED 05/25/2004
Japanese
バッテリ残量ゲージについての誤解を解く—ワイヤレス携帯その他製品が高精度バッテリ監視からどのように利益を得るのか redirect icon

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UPDATED 10/25/2002
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Calibrating the Offset Register of the DS2761 redirect icon

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UPDATED 09/16/2005
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Assembling High-Lead (Pb) DS2761 Flip-Chips in a Pb-Free Assembly Flow redirect icon

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UPDATED 09/16/2005
Chinese
采用无铅(Pb)装配流程装配高含铅的DS2761倒装芯片 redirect icon

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UPDATED 02/18/2006
Japanese
鉛フリー実装フローで高鉛(Pb)DS2761フリップチップを実装 redirect icon

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UPDATED 10/20/2003
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Characterizing a Li+ Cell for Use with a Fuel Gauge redirect icon

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UPDATED 01/30/2007
Chinese
获取电量计应用中的锂电池特性 redirect icon

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UPDATED 02/17/2006
Japanese
残量ゲージ用にリチウム電池の特性を測定する方法 redirect icon

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UPDATED 06/18/2004
English
Waking up a DS2761/DS2762 redirect icon

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Software & Part Ecosystem

Evaluation Kits 1

DS2761K

Li+ Battery Monitor Evaluation Kit

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DS2761K

Li+ Battery Monitor Evaluation Kit

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DS2761K
Li+ Battery Monitor Evaluation Kit

Features and Benefits

    Demonstrates the capabilities of the DS2761 Li+ battery monitor, including:
  • Temperature measurement
  • Voltage measurement
  • Current measurement
  • Current accumulation
  • Information storage
  • Identification
  • Overvoltage/undervoltage protection
  • Overcurrent/short circuit protection,
    Interfaces to the serial port of a PC Running Windows 95, Windows 98, or Windows NT
Buy Now View Details

Product Detail

The DS2761K evaluation kit makes performance evaluation, software development, and prototyping with the DS2761 Li+ battery monitor easy. The evaluation board interfaces to an IBM®-compatible PC through a DS9123 serial port 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® 95, Windows 98, or Windows NT.

The DS2761K evaluation software gives the user complete control of all functions of the DS2761. Separate control tabs allow the user access to all EEPROM and RAM memory locations, all control registers, and real-time updates of all monitored parameters. The software also incorporates a data logging feature to monitor a cell over time and fuel gauging algorithms to improve remaining capacity calculations based on specific cell characteristics.

The evaluation board circuit is designed to provide the DS2761 with accurate parameter measurements, allow the DS2761 to disable charging or discharging, and protect the DS2761 from ESD damage. Kit demonstration boards will vary as they are improved upon over time. For information on the demonstration board circuits refer to the DOCS browser page when auto running from the DS2761K CD-ROM or inside the documentation directory on the DS2761K CD-ROM.

Evaluation Kits1

DS2761K

Li+ Battery Monitor Evaluation Kit

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