DS2740

PRODUCTION

DS2740

High-Precision Coulomb Counter

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

PRODUCTION

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Part Models 4

1ku List Price Starting From $2.57

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 (R_SNS)
- 156µA LSB and ±5.12A Dynamic Range with External 10mΩ Sense Resistor (R_SNS)
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 (R_SNS)
- 625µA LSB and ±5.12A Dynamic Range with External 10mΩ Sense Resistor (R_SNS)
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 R_SNS
- 0.6250mAhr with External 10mΩ R_SNS
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

Additional Details

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.

Applications

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

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 4

1ku List Price Starting From $2.57

Documentation

Technical Documents 4

DS2740: High-Precision Coulomb Counter Data Sheet (Rev.4) 05/19/2005

DS2740 Reliability Data 01/12/2023

1-Wire Search Algorithm 03/28/2002

Alternate DS2740U Application Circuit with Reduced Current Measurement Offset Error\r\n 03/09/2004

Design Resources 4

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
DS2740BU+	Micro-MAX, Thin Shrink Small-Outline	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
DS2740BU+T&R	Micro-MAX, Thin Shrink Small-Outline	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
DS2740U+	Micro-MAX, Thin Shrink Small-Outline	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
DS2740U+T&R	Micro-MAX, Thin Shrink Small-Outline	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys