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DS2776

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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

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Product Details

See parametric specs for Battery Fuel Gauges, Protectors, and Monitors

Key Features

See parametric specs for Battery Fuel Gauges, Protectors, and Monitors
Parametric specs for Battery Fuel Gauges, Protectors, and Monitors
Functions Fuel Gauge
Protector
Status Monitor
Battery Type 2 Cell Li-Ion
Fuel Gauge Algorithm FuelPack
Interface 1-Wire
User Data Storage (Bytes) 16 EEPROM
Parameters Measured Current
Temperature
Time
Voltage
End Equipment Pack
Battery Protection Features Over Voltage
Over-Current
Over/Under Voltage
VSUPPLY (V) (min) 4
VSUPPLY (V) (max) 9.2
Package/Pins TDFN/14
Oper. Temp. (°C) -20 to +70
Budgetary
Price (See Notes) 		4.54
See parametric specs for Battery Fuel Gauges, Protectors, and Monitors
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Simplified Block Diagram

Technical Docs

Data Sheet 2-Cell, Fuel Gauge with FuelPack, Protector, and SHA-1 Authentication Feb 09, 2018

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact [email protected] with any questions regarding this Sample Site.

Parameters

Parametric specs for Battery Fuel Gauges, Protectors, and Monitors
Functions Fuel Gauge
Protector
Status Monitor
Battery Type 2 Cell Li-Ion
Fuel Gauge Algorithm FuelPack
Interface 1-Wire
User Data Storage (Bytes) 16 EEPROM
Parameters Measured Current
Temperature
Time
Voltage
End Equipment Pack
Battery Protection Features Over Voltage
Over-Current
Over/Under Voltage
VSUPPLY (V) (min) 4
VSUPPLY (V) (max) 9.2
Package/Pins TDFN/14
Oper. Temp. (°C) -20 to +70
Budgetary
Price (See Notes) 		4.54
See parametric specs for Battery Fuel Gauges, Protectors, and Monitors

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

Applications/Uses

  • 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

Description

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.

Simplified Block Diagram

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 Zoom icon

Technical Docs

Data Sheet 2-Cell, Fuel Gauge with FuelPack, Protector, and SHA-1 Authentication Feb 09, 2018

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact [email protected] with any questions regarding this Sample Site.