SERIAL OUTPUT, 5.6µS, 12-BIT ADC WITH REFERENCE

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.

• 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 (V_IN = 4V to 28V)