Status
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.
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Data Sheet
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