Advanced Smart Battery-Pack Controller

The MAX1782 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 8k bytes of user programmable EEPROM, which provides battery-pack designers with complete flexibility in developing fuel gauging and control algorithms. The MAX1782 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 0.85% accuracy and over-current protection allow the MAX1782 to eliminate a separate 1st level protection IC. Adjustable over-current thresholds and delay timers provide a flexible solution.

The MAX1782 provides an additional input which allows the protection MOSFETs to be forced off by external hardware.

The integrating fuel gauge module provides a typical input offset of less than 1µV, and gain accuracy of better than 1.5% with no trimming required during pack manufacture. The MAX1782 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.

Applications

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

* Accurate Fuel Gauge Uses V to F Method

* < 1µV Input Offset Voltage

* < 1.5% Gain Accuracy

* No Calibration Required

* 8-bit RISC Microcontroller Core

* 8k 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 0.85% 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)