Product Details
Key Features
Applications/Uses
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 |
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 SearchOur 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
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 |
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
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.
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 SearchOur 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.