DS2790

www.DataSheet4U.com DS2790 Programmable 1-Cell Li-Ion Fuel Gauge and Protector www.maxim-ic.com GENERAL DESCRIPTION The DS2790 provides a complete fuel gauging and protection solution for single cell Li-Ion battery packs. A low-power 16-bit MAXQ20 microcontroller with generous program and data memory, combined with an accurate measurement system for battery current, voltage, and temperature provide the ideal platform for customized fuelgauge algorithms. The 2-wire 2 interface provides an I C*- or SMBusä-compatible communication path between the host and battery pack, while providing password protected programming of the fuel-gauging firmware. EEPROM data memory supports nonvolatile in-pack storage of charge parameters, cell characteristics, usage history, and manufacturing/lot tracking data. An autonomous state machine performs voltage, current, and temperature related protection functions. This capability increases reliability of the whole system by eliminating dependence on the CPU for protection. The DS2790 supports Li-Ion batteries in a wide range of applications. FEATURES § Accurate Current Measurement for Coulomb Counting (Current Accumulation) 1.5% ±4µV over ± 64mV Input Range 1.5% ±267µA over ±4.2A Range Using an External 15mW Series Resistor High Resolution Current Reporting 12-bit + Sign Average Every 0.88ms 15-bit + sign Average Every 2.8s Voltage Measurement 10-bit Average Temperature Measurement 10-bit Using On-Chip Sensor 16-bit MAXQ20 Low Power Microcontroll...