MAX1781
Advanced Smart Battery-Pack Controller
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
Part Details
- 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
- 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)
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.
Applications
- Data Acquisition Systems
- Notebook Battery Packs
- Proprietary Battery Packs
- Remote Data Logging
Documentation
Reliability Data 1
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Complete documentation is available upon completion of a Non-Disclosure Agreement (NDA).
Request an NDAHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Product 1 | ||
| MAX1782 | Advanced Smart Battery-Pack Controller | |