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High-Precision Coulomb Counter

High-Precision Battery Fuel Gauge Costs Less than $1.00 Ideal for Handheld Products

Product Details

Key Features

Parametric specs for Battery Fuel Gauges, Protectors, and Monitors
Functions Fuel Gauge
Battery Type 1 Cell Li-Ion
3-Cell NiMH
Interface 1-Wire
Parameters Measured Current
End Equipment Pack
VSUPPLY (V) (min) 2.7
VSUPPLY (V) (max) 5.5
Package/Pins UMAX/8
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
2.34
View Less

Simplified Block Diagram

Support & Training

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Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Parameters

Parametric specs for Battery Fuel Gauges, Protectors, and Monitors
Functions Fuel Gauge
Battery Type 1 Cell Li-Ion
3-Cell NiMH
Interface 1-Wire
Parameters Measured Current
End Equipment Pack
VSUPPLY (V) (min) 2.7
VSUPPLY (V) (max) 5.5
Package/Pins UMAX/8
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
2.34

Key Features

  • 15-Bit Bidirectional Current Measurement (DS2740U)
    • 1.56µV LSB and ±51.2mV Dynamic Range
    • 78µA LSB and ±2.56A Dynamic Range with External 20mΩ Sense Resistor (RSNS)
    • 156µA LSB and ±5.12A Dynamic Range with External 10mΩ Sense Resistor (RSNS)
  • 13-Bit Bidirectional Current Measurement (DS2740BU)
    • 6.25µV LSB and ±51.2mV Dynamic Range
    • 312µA LSB and ±2.56A Dynamic Range with External 20mΩ Sense Resistor (RSNS)
    • 625µA LSB and ±5.12A Dynamic Range with External 10mΩ Sense Resistor (RSNS)
  • Analog Input Filter (IS1, IS2) Extends Dynamic Range for Pulse-Load Applications
  • Current Accumulation Register Resolution
    • 6.25µVhr (Both DS2740U and DS2740BU)
    • 0.3125mAhr with External 20mΩ RSNS
    • 0.6250mAhr with External 10mΩ RSNS
  • Dallas 1-Wire Interface
    • Unique 64-Bit Device Address
    • Standard and Overdrive Timings (OVD)
  • Low Power Consumption:
    • Active Current: 65µA max
    • Sleep Current: 1µA max

Applications/Uses

  • Cell Phones
  • Digital Still Cameras
  • Portable Entertainment Devices
  • Smart Battery Packs/Chargers

Description

The DS2740 remains in production, however, for new projects, we recommend ModelGauge m5 MAX17211 fuel gauge.

The DS2740 provides high-precision current-flow measurement data to support battery-capacity monitoring in cost-sensitive applications. Current is measured bidirectionally over a dynamic range of 15 bits (DS2740U) or 13 bits (DS2740BU), with the net flow accumulated in a separate 16-bit register. Through its 1-Wire® interface, the DS2740 allows the host system read/write access to status and current measurement registers. Each device has a unique factory-programmed 64-bit net address that allows it to be individually addressed by the host system, supporting multibattery slot operation. The interface can be operated with standard or overdrive timing.

Although the DS2740 is primarily intended for location on the host system, it is also suited for mounting in the battery pack. The DS2740 and FuelPack™ algorithms, along with host measurements of temperature and voltage, form a complete and accurate solution for estimating remaining capacity.

Simplified Block Diagram

DS2740 provides high-precision current-flow measurement data to support battery-capacity monitoring in cost-sensitive applications | Pin Configurations DS2740 provides high-precision current-flow measurement data to support battery-capacity monitoring in cost-sensitive applications | Pin Configurations

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.