DS2740U+T&R

Overview

The DS2740U+T&R is a high-precision coulomb counter designed for battery management applications. It features a 15-bit bidirectional current measurement capability with a dynamic range of ±51.2mV and supports external sense resistors of 10mΩ or 20mΩ. The device operates on a supply voltage between 2.7V and 5.5V, consuming a maximum of 65µA during operation and 1µA in sleep mode. It utilizes a Dallas 1-Wire interface with a unique 64-bit address for communication. Packaged in an 8-UMAX format, it functions within a temperature range of -40°C to +85°C.

Feature Summary

• Provides high-precision bidirectional current measurement using a 15-bit resolution architecture.
• Integrates a Dallas 1-Wire interface supporting standard and overdrive timing modes.
• Features low power consumption with distinct operational and sleep current profiles.
• Includes analog input filters to extend dynamic range under pulsed load conditions.

Applications

• Cellular telephones
• Digital cameras
• Portable entertainment devices
• Smart battery packs and chargers

Procurement Notes

Verify component authenticity through authorized Analog Devices channels due to limited availability status. Confirm the specific suffix T&R indicates reel packaging when sourcing. Ensure compatibility with the 8-UMAX footprint and validate that the 1-Wire protocol implementation aligns with system requirements before finalizing procurement decisions.

Selection Notes

Select this component when precise state-of-charge estimation is required for lithium-ion or NiMH batteries. The 15-bit resolution makes it suitable for cost-sensitive applications demanding accurate capacity monitoring. Consider the 1-Wire interface constraints and ensure the host microcontroller supports the necessary communication timing standards for reliable data exchange.

Part Context

This part belongs to the DS2740 series of high-precision coulomb counters manufactured by Analog Devices / Maxim Integrated. It serves as a dedicated battery management IC designed to monitor charge flow accurately. The series is engineered to support FuelPack algorithms for comprehensive battery capacity estimation when combined with voltage and temperature measurements.

Replacement Considerations

DS2740BU+ offers 13-bit resolution instead of 15-bit. DS2745U+ provides similar functionality with MSOP-8 packaging options. Verify pinout compatibility and register mapping differences before substituting these variants in existing designs.