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DS2786B - Stand-Alone OCV-Based Fuel Gauge

General Description

The DS2786B estimates available capacity for rechargeable Li-ion (Li+) and Li+ 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 25µV LSB, ±51.2mV Dynamic Range 1.67mA LSB, ±3.4A (RSNS = 15mΩ).
  • Current Accumulation Measurement Resolution ±204.8mVh Range ±.

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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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19-5223; Rev 1; 4/10 www.DataSheet4U.com Stand-Alone OCV-Based Fuel Gauge General Description The DS2786B estimates available capacity for rechargeable Li-ion (Li+) and Li+ 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 DS2786B 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.