MAX1781

MAX1781 Advanced Smart Battery-Pack Controller __________General Description ____________________Features The MAX1781 smart battery-pack controller integrates a user-programmable microcontroller core, a Coulombcounting 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 1uV, 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. ________________Applications ¨ Accurate Fuel Gauge Uses V to F Method · <1µV Input Offset Voltage · <1% Gain Accuracy · No Calibr...