Overview

Features and Benefits

  • High-Side nFET Drivers and Protection Circuitry
  • Precision Voltage, Temperature, and Current Measurement System
  • Cell-Capacity Estimation from Coulomb Count, Discharge Rate, Temperature, and Cell Characteristics
  • Estimates Cell Aging Between Learn Cycles
  • Uses Low-Cost Sense Resistor
  • Allows Calibration of Gain and Temperature Coefficient
  • Programmable Thresholds for Overvoltage and Overcurrent
  • Pack Authentication Using SHA-1 Algorithm (DS2776/DS2778)
  • 32-Byte Parameter EEPROM
  • 16-Byte User EEPROM
  • Maxim 1-Wire Interface with 64-Bit Unique ID (DS2775/DS2776)
  • 2-Wire Interface with 64-Bit Unique ID (DS2777/DS2778)
  • 3mm x 5mm, 14-pin TDFN Lead-Free Package

Product Details

The DS2775–DS2778 report available capacity for rechargeable lithium-ion (Li+) and Li+ polymer (Li-Poly) batteries in mAh and as a percentage of full. Safe operation is ensured by the integrated Li+ protector. The DS2776/DS2778 support SHA-1-based challenge-response authentication in addition to all other DS2775/DS2777 features.

Precision measurements of voltage, temperature, and current, along with a cell characteristics table and application parameters, are used for capacity estimation calculations. The capacity registers report a conservative estimate of the amount of charge that can be removed given the current temperature, discharge rate, stored charge, and application parameters.

The DS2775–DS2778 operate from +4.0V to +9.2V for direct integration into battery packs with two Li+ or Li- Poly cells.

In addition to nonvolatile storage for cell compensation and application parameters, the DS2775–DS2778 offer 16 bytes of EEPROM for use by the host system and/or pack manufacturer to store battery lot and date tracking information. The EEPROM can also be used for nonvolatile storage of system and/or battery usage statistics. A Maxim 1-Wire® (DS2775/DS2776) or 2-wire (DS2777/DS2778) interface provides serial communication to access measurement and capacity data registers, control registers, and user memory. The DS2776/DS2778 use the SHA-1 hash algorithm in a challenge-response pack authentication protocol for battery-pack verification.

Applications

  • Digital Still, Video, and Action Cameras
  • Handheld Computers and Terminals
  • Handheld Radios
  • Health and Fitness Monitors
  • Home and Building Automation, Sensors
  • Medical Devices
  • Power Tools
  • Smart Batteries

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (4)

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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.

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.