DS2746
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DS2746

Low-Cost, 2-Wire Battery Monitor with Ratiometric A/D Inputs

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2-Wire Fuel Gauge Measures Battery Current and Voltage and Includes Ratiometric Voltage Inputs that Can Be Used to Sample Thermistor, Pack ID, or Another Voltage Source

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $2.78
Features
  • 14-Bit Bidirectional Current Measurement
    • 6.25µV LSB, ±51.2mV Dynamic Range
    • 416.7µA LSB, ±3.4A Range (RSNS = 15mΩ)
  • Current Accumulation Register Resolution
    • 6.25µVhr LSB, 409.6mVh Range
    • 417µAhr LSB, 27.31Ah Range
  • 11-Bit Battery Voltage Measurement
    • 2.44mV LSB, 0V to 4.997V Input Range
    • ±10mV Accuracy at 3.6V Input
  • Two 11-Bit Aux Input Voltage Measurements
    • Ratiometric Inputs Eliminate Supply Error
    • VOUT drives Dividers, Reduces Power
    • ±8 LSB Accuracy
  • Low Power Consumption:
    • Active Current: 70µA typical, 100µA max
    • Sleep Current: 1µA typical, 3µA max
Additional Details
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The DS2746 remains in production, however, for new projects, we recommend ModelGauge m5 MAX17055 fuel gauge.

The DS2746 provides system-side battery capacity monitoring in cost-sensitive applications. Voltage, bidirectional current, and accumulated current measurement data is provided to the host processor over a 2-wire interface. Offset bias and offset blanking features greatly enhance the accuracy of the coulomb counter. In addition, the DS2746 has two auxiliary A/D inputs to sample the pack identification resistor, thermistor, or other voltage source. The results are reported as a ratiometric fraction of the supply voltage eliminating error related to the supply. The DS2746 reduces the total power consumption of the measurement circuit by enabling the resistor dividers, through the VOUT pin, only while measurements are made. When the system is inactive, a low power sleep mode reduces current consumption while maintaining the coulomb count. The tiny 3mm × 3mm TDFN package consumes only 9mm² of PCB space

Applications

  • 2.5G/3G Wireless Handsets
  • Digital Still and Video Cameras
  • Handheld Computers and Terminals
  • PDA/Smartphones
Part Models 2
1ku List Price Starting From $2.78

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
DS2746G+
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DS2746G+T&R
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Product Lifecycle

PCN

Jun 20, 2016

- 1612

ASSEMBLY

DS2746G+

PRODUCTION

DS2746G+T&R

PRODUCTION

Filter by Model

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Part Models

Product Lifecycle

PCN

Jun 20, 2016

- 1612

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ASSEMBLY

DS2746G+

PRODUCTION

DS2746G+T&R

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

DS2746EVKIT

Evaluation Kit for the DS2746

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DS2746EVKIT

Evaluation Kit for the DS2746

Evaluation Kit for the DS2746

Features and Benefits

  • Demonstrates the capabilities of the DS2746 Low-Cost 2 Wire Battery Monitor with Ratiometric A/D Inputs including:
    • Voltage measurement
    • Current measurement
    • Current accumulation
    • A/D input measurements for ID or Thermistor Reading
  • Interfaces to the USB Port of a PC Running Windows XP® or Older Operating System

Product Detail

The DS2746 evaluation kit (EV kit) makes performance evaluation, software development, and prototyping with the DS2746 Low-Cost 2 Wire Battery Monitor with Ratiometric A/D Inputs 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 DS2746 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 refer to our website at www.maximintegrated.com.

Applications

  • 2.5G/3G Wireless Handsets
  • Digital Still and Video Cameras
  • Handheld Computers and Terminals
  • PDA/Smartphones

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