MAX1788

Advanced Smart Battery-Pack Controller

Smallest, Lowest Power Consumption 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

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Overview

Accurate Fuel Gauge Uses V-to-F Method
8-Bit RISC Core
12-Bit ADC
Built-In Protection MOSFET Drivers
SMBus v1.1 Compliant

The MAX1788 smart battery-pack controller integrates a user programmable microcontroller core, a Coulomb-counting fuel gauge, a multi-channel data-acquisition unit, protection drivers, and SMBus™ v1.1 compliant master/slave SMBus interface. The 8-bit RISC microcontroller core integrates 8k bytes of user programmable flash and an 8k byte ROM library. This provides battery-pack designers with complete flexibility in developing fuel gauging and control algorithms. The MAX1788 is equipped with ISD (In System Debug) capability for efficient firmware development and debugging.

The MAX1788 includes a 12-bit data-acquisition unit to measure individual cell voltages, thermistors, instantaneous current and pack voltage. Individual cell voltage measurements with 0.5% accuracy and overcurrent protection to provide first level protection. Internally adjustable over-current thresholds and delay timers provide a flexible solution.

The integrating fuel gauge module has a typical input offset of 1µV, and gain accuracy of better than 1% with no trimming required during pack manufacture. The MAX1788 has a wide 4V to 25V operating voltage range, and is available in a 28 pin TSSOP. The MAX1788 EvKit, development tools and reference design are available.