DS2786
Info: : PRODUCTION
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DS2786

Stand-Alone OCV-Based Fuel Gauge

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2-Wire Stand-Alone Fuel Gauge Requires No Learn Cycle to Provide Initial Capacity Estimate or Maintain Accuracy During Use

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $2.79
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 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
    • ±13.65Ah (RSNS = 15mΩ)
  • Internal Temperature Measurement:
    • 0.125°C LSB, ±3°C Accuracy
  • Two 11-Bit Aux Input Voltage Measurements:
    • ±8 LSB Accuracy, Ratiometric Inputs Eliminate Supply Accuracy Issues
  • VOUT Pin Drives Resistive Dividers, Reduces Current Consumption
  • 2-Wire Interface
  • Low Power Consumption:
    • Active Current: 50µA typ, 80µA max
    • Sleep Current: 1µA typ, 3µA max
Additional Details
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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. Cell characteristics and application parameters used in the calculations are stored in on-chip EEPROM.

The DS2786 is intended for use on the host side of portable devices, though it can also be mounted within a battery pack. Measurement and estimated capacity data are accessed through an I²C interface. Temperature data is available from an on-die sensor. Resistance measurements of a pack identification resistor and pack thermistor are supported by ratiometric measurements on two auxiliary inputs.

Applications

  • 3G Multimedia Wireless Handsets
  • Digital Audio (MP3) Players
  • Digital Still Cameras
Part Models 2
1ku List Price Starting From $2.79

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
DS2786G+
  • HTML
  • HTML
DS2786G+T&R
  • HTML
  • HTML
Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

DS2786EVKIT

Stand-Alone OCV-Based Fuel Gauge Evaluation Kit

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DS2786EVKIT

Stand-Alone OCV-Based Fuel Gauge Evaluation Kit

Stand-Alone OCV-Based Fuel Gauge Evaluation Kit

Features and Benefits

  • Demonstrates the Capabilities of the DS2786 Stand-Alone OCV-Based Fuel Gauge Including:
    • Estimation of Available Capacity for Li+ Cells
    • Voltage Measurement
    • Current Measurement
    • Current Accumulation
    • Temperature Measurement
    • Information Storage
    • Thermistor Reading
  • Interfaces to the USB Port of a PC Running Windows XP® or Older Operating System

Product Detail

The DS2786 evaluation kit (EV kit) makes performance evaluation, software development, and prototyping with the DS2786 stand-alone OCV-based fuel gauge easy. The evaluation board interfaces to a PC through a DS9123O USB adapter and RJ-11 cable connection.

Separate control tabs allow the user access to all memory locations, all control registers, and real-time updates of all monitored parameters. The software also incorporates a data-logging feature to monitor a cell over time.

The evaluation board circuit is designed to provide the DS2786 with accurate parameter measurements as well. Kit demonstration boards will vary as they are improved upon over time. For information on the demonstration board circuits, visit our website at www.maximintegrated.com.

Applications

  • 3G Multimedia Wireless Handsets
  • Digital Audio (MP3) Players
  • Digital Still Cameras

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