Top

Advanced Smart Battery-Pack Controller

Advanced Smart Battery-Pack Controller Integrates a User-Programmable Microcontroller Core, a Coulomb-Counting Fuel Gauge, a Multichannel Data-Acquisition Unit, and an SMBus™ V1.1-Compliant Master/Slave SMBus Interface

Product Details

Key Features

Simplified Block Diagram

Technical Docs

Data Sheet Advanced Smart Battery-Pack Controller Mar 16, 2004

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Key Features

  • Accurate Fuel Gauge Uses V to F Method
    • < 1µV Input Offset Voltage
    • < 1% Gain Accuracy
    • No Calibration Required
  • 8-bit RISC Microcontroller Core
  • 12k Bytes of Program/Data EEPROM
  • 64 Bytes of Byte Writeable EEPROM
  • 264 Bytes of RAM
  • Watchdog Timer
  • ICE for Firmware Debugging
  • Integrated Development Environment (IDE)
    • C Compiler
    • Inline Assembler
  • Eliminates Separate Primary-Protection IC
    • Individual Cell Voltage Measurements with 0.5% accuracy
    • Built-In Protection MOSFET Gate Drivers
    • 8% Accurate Overcurrent Protection
    • Programmable Over-Current Delay Timers
  • SMBus v1.1-Compliant, with Master Capability
  • Typical Operating Current < 120µA
  • Typical Shutdown Current < 10nA
  • Integrated 32kHz Oscillator: No Crystal
  • Fully Integrated LDO (VIN = 4V to 28V)

Applications/Uses

  • Data Acquisition Systems
  • Notebook Battery Packs
  • Proprietary Battery Packs
  • Remote Data Logging

Description

The MAX1781 smart battery-pack controller integrates a user-programmable microcontroller core, a coulomb-counting fuel gauge, a multi-channel data-acquisition unit, and an SMBus v1.1 compliant master/slave SMBus interface. The 8-bit, RISC microcontroller core has an integrated 12k bytes of user programmable EEPROM, which provides battery-pack designers with complete flexibility in developing fuel gauging and control algorithms. The MAX1781 is equipped with full ICE (in-circuit emulator) capability for efficient firmware development and debugging.

The 16-bit data-acquisition unit measures individual cell voltages, cell stack voltage, chip internal/external temperature, and two general purpose analog inputs. Individual cell voltage measurements with 0.5% accuracy and over-current protection allow the MAX1781 to eliminate a separate 1st level protection IC. Adjustable over-current thresholds and delay timers provide a flexible solution.

The integrating fuel gauge module provides a typical input offset of less than 1µV, and gain accuracy of better than 1% with no trimming required during pack manufacture. The MAX1781 has a wide 4V to 28V operating voltage range. The IC is available in a 7mm x 7mm 48-TQFN package with a maximum thickness of 0.8mm.

Simplified Block Diagram

Technical Docs

Data Sheet Advanced Smart Battery-Pack Controller Mar 16, 2004

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .