2-Cell, Fuel Gauge with FuelPack, Protector, and SHA-1 Authentication

Industry's Smallest 2-Cell, Stand-Alone Fuel Gauge to Integrate an Li+ Protector and SHA-1 Authentication

Please check latest availability status for a specific part variant.


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.
DS2775-8 report available capacity for rechargeable lithium-ion (Li+) and Li+ polymer (Li-Poly) batteries in mAh | Typical Application Circuits DS2775-8 report available capacity for rechargeable lithium-ion (Li+) and Li+ polymer (Li-Poly) batteries in mAh | Typical Application Circuits Enlarge+

Key Features

  • 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


  • 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

See parametric specs for Battery Fuel Gauges, Protectors, and Monitors (52)

Part NumberFunctionsBattery TypeFuel Gauge AlgorithmInterface
Fuel Gauge
Status Monitor
2 Cell Li-IonFuelPack1-Wire
DS2776 1-Wire
DS2777 2-Wire
DS2778 2-Wire

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

DS2775EVKIT: Evaluation Kit for the DS2775, DS2776, DS2777, and DS2778
DS2776EVKIT: Evaluation Kit for the DS2775, DS2776, DS2777, and DS2778
DS2777EVKIT: Evaluation Kit for the DS2775, DS2776, DS2777, and DS2778
DS2778EVKIT: Evaluation Kit for the DS2775, DS2776, DS2777, and DS2778
Product Reliability Reports: DS2778.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >


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