DS2740

PRODUCTION

High-Precision Coulomb Counter

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

Data Sheet (Rev. 4) Product Selection Table

Part Models: 4
1ku List Price: Starting From $2.57

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Overview

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

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

Part Models: 4
1ku List Price: Starting From $2.57

Documentation

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	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
DS2740BU+T&R	Micro-MAX, Thin Shrink Small-Outline	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
DS2740U+	Micro-MAX, Thin Shrink Small-Outline	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
DS2740U+T&R	Micro-MAX, Thin Shrink Small-Outline	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Sep 19, 2018 - 1753N ASSEMBLY
		pcn_1753n
DS2740U+	PRODUCTION
DS2740U+T&R	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

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DS2740K Evaluation Kit Software, 1.7.0

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Overview

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