Smart Battery-Pack Controller 8kB Program Flash 12-bit 4V to 25V 28-Pin TSSOP T/R

The MAX1789 smart battery-pack controllers integrate a user-programmable microcontroller core, a coulomb-counting fuel gauge, a multichannel data-acquisition unit, and a system management bus (SMBus) v1.1-compliant master/slave SMBus interface. The 8-bit, RISC microcontroller core has an integrated 8kB of user-programmable flash and a 12kB program ROM library, which provides battery-pack designers with complete flexibility in developing fuel gauging and control algorithms. The MAX1789 is equipped with in-system debug (ISD) capability for efficient development and debugging.The MAX1789 include a 12-bit data-acquisition unit to measure individual cell voltages, thermistors, current, and pack voltage. Internally adjustable overcurrent 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 MAX1789 have a wide +4V to +25V operating voltage range. The MAX1789/MAX17892 are available in a lead-free, 28-pin TSSOP package. The MAX1789/MAX17892 evaluation kit is available to assist with development.

• Accurate Fuel Gauge Uses V-to-F Method < 1µV Input Offset Voltage < 1% Gain Error 139nAh Resolution (5mO) No Calibration Required
• 8-Bit RISC Microcontroller Core
• 8kB of Program Flash
• 12kB of Program ROM
• 512 Bytes of Data Flash
• 648 Bytes of RAM
• 12-Bit ADC
• Watchdog Timer
• In-System Debug
• Eliminates Separate Primary-Protection IC
• Individual Cell-Voltage Measurements with 0.5% Accuracy
• n-Channel MOSFET Gate Drivers
• Low-Current Charge Pump
• 8% Accurate Overcurrent Protection
• Programmable Overcurrent Delay Timers
• 3-Pin, 6-LED PWM Driver (Only for MAX1789)
• Random-Number Generator (RNG) for Encryption
• SMBus v1.1 Compliant with Master Capability
• Typical Operating Current < 250µA
• Typical Shutdown Current < 10nA
• Integrated 32kHz Oscillator: No Crystal
• Fully Integrated LDO (VIN = +4V to +25V)