DS2778
PRODUCTION2-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
- Part Models
- 2
- 1ku List Price
- Starting From $5.75
Overview
- 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
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
Documentation
Data Sheet 1
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. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| DS2778G+ | Thin Dual Flatpack No Leads | ||
| DS2778G+T&R | Thin Dual Flatpack No Leads |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Software Development 1
Evaluation Kits
Evaluation Kit for the DS2775, DS2776, DS2777, and DS2778
Evaluation Kit for the DS2775, DS2776, DS2777, and DS2778
Evaluation Kit for the DS2775, DS2776, DS2777, and DS2778
Evaluation Kit for the DS2775, DS2776, DS2777, and DS2778
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