DESCRIPTION

The DS2755 high-precision battery fuel gauge is a data-acquisition and information-storage device tailored for cost-sensitive and space-constrained 1-cell Li+/polymer battery-pack applications. The DS2755 provides the key hardware components required to accurately estimate remaining capacity by integrating low-power, precision measurements of temperature, voltage, current, and current accumulation, as well as nonvolatile (NV) data storage, into the small footprint of a 3.0mm x 4.4mm 8-pin TSSOP package.

FEATURES

■ Snapshot Mode Allows Instantaneous Power Measurement

■ Accurate Current Measurement for Coulomb Counting (Current Accumulation)

- 2 ±4μV over ±64mV Input Range

- 2 ±200μA over ±3.2A Range Using a 20mΩ Sense Resistor

■ Current Measurement

- 9-Bit Bidirectional Snapshot Measurement

- 12-Bit Bidirectional Average Updated Every 88ms

- 15-Bit Bidirectional Average Updated Every 2.8s

■ Voltage Measurement

- 9-Bit Snapshot Measurement

- 10-Bit Measurement Updated Every 4ms

■ Temperature Measurement

- 10-Bit Measurement, 0.125°C Resolution Using Integrated Sensor

■ Host Alerted When Accumulated Current or Temperature Exceeds User-Selectable Limits

■ 96 Bytes of Lockable EEPROM

■ 8 Bytes of General-Purpose SRAM

■ Dallas 1-Wire® Interface with Unique 64-Bit Device Address with Standard 16kbps or Overdrive 142kbps Timing

■ 3mm Dimension of 8-Pin TSSOP Package Allows Mounting on Side of Thin Prismatic Li+ and Li+/Polymer Cells

APPLICATIONS

Cell Phones

Digital Cameras

Smartphones

PDAs

Portable Consumer Products