DESCRIPTION

The DS2770 battery monitor and charge controller performs several functions needed for thorough battery maintenance. When used in conjunction with the host system’s processor, a battery-pack resident DS2770 may be utilized for applications that include charging, remaining capacity estimation, safety monitoring, and nonvolatile (NV) parametric storage.

FEATURES

■ Integrated charge controller supporting both rechargeable lithium and NiMH battery technologies

■ Available in two configurations:

– Internal 25mΩ current-sense resistor

– External user-selectable sense resistor

■ Current measurement:

– 15-bit bidirectional measurement

– Internal sense resistor configuration: 62.5μA LSB and ±2A dynamic range

– External sense resistor configuration: 1.56μV LSB and ±51.2mV dynamic range

■ Current accumulation

– Internal sense resistor: 0.25mAh LSB

– External sense resistor: 6.25μVh LSB

■ Voltage measurement with 4.88mV resolution

■ Temperature measurement using integrated sensor with 0.125°C resolution

■ 40 bytes of lockable EEPROM

■ 16 bytes of general-purpose SRAM

■ 42-day timer

■ Dallas 1-Wire? interface with 64-bit ID

■ 1.8V logic levels

■ Low power consumption:

– Active current: 80μA typical

– Sleep current: 0.5μA typical