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
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.
Key Features
Applications/Uses
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
