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DS2786 - Standalone OCV-Based Fuel Gauge

General Description

The DS2786 estimates available capacity for rechargeable Li-Ion and Li-Ion Polymer batteries based on the cell voltage in the open-circuit state following a relaxation period.

The open-circuit voltage (OCV) is used to determine relative cell capacity based on a lookup table stored in the IC.

Key Features

  • Relative Capacity Calculated from Combination Coulomb Counter and Open- Circuit Cell Voltage (OCV) Battery Model.
  • Accurate Warning of Low Battery Conditions Even On First Cycle (No Learn Cycle Needed).
  • 12-Bit Battery Voltage Measurement: ±10mV Accuracy 1.22mV LSB, 0V to 4.5V Input Range.
  • 11-Bit Bidirectional Current Measurement: 25V LSB, ±51.2mV Dynamic Range 1.67mA LSB, ±3.4A (RSNS = 15m).
  • Current Accumulation Measurement Resolution: ±204.8mVh Range ±13.65Ah (RSNS =.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-4637; 5/09 www.maxim-ic.com GENERAL DESCRIPTION The DS2786 estimates available capacity for rechargeable Li-Ion and Li-Ion Polymer batteries based on the cell voltage in the open-circuit state following a relaxation period. The open-circuit voltage (OCV) is used to determine relative cell capacity based on a lookup table stored in the IC. This capability makes accurate capacity information available immediately after a battery pack is inserted. During periods of moderate to high rate discharging, which preclude OCV measurements, the DS2786 uses coulomb counting as a secondary means of estimating relative capacity. Remaining capacity is reported in percent, along with cell voltage, current and temperature information.