DS2784
1-Cell Fuel Gauge with FuelPack, Protector, and SHA-1 Authentication
Industry's First Complete Fuel Gauge Solution to Integrate a 1-Cell Li+ Protector and SHA-1 Authentication System
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Overview
Features and Benefits
- Precision Voltage, Temperature, and Current Measurement System
- Available Capacity Estimated from Coulomb Count, Discharge Rate, Temperature, and Cell Characteristics
- Estimates Cell Aging Using Learn Cycles
- Uses Low-Cost Sense Resistor
- Allows for Calibration of Gain and Temperature Coefficient
- Li+ Safety Circuitry—Overvoltage, Undervoltage, Overcurrent, Short-Circuit Protection
- Programmable Safety Thresholds for Overvoltage and Overcurrent
- Authentication Using SHA-1 Algorithm and 64-Bit Secret
- 32-Byte Parameter EEPROM
- 16-Byte User EEPROM
- Dallas 1-Wire Interface with 64-Bit Unique ID
- Tiny, Pb-Free, 14-Pin TDFN Package Embeds Easily in Battery Packs Using Thin Prismatic Cells
Product Details
The DS2784 operates from 2.5V to 4.6V for integration in battery packs using a single lithium-ion (Li+) or Li+ polymer cell. Available capacity is reported in mAh and as a percentage. Safe operation is ensured with the included Li+ protection function and SHA-1-based challenge-response authentication.
Precision measurements of voltage, temperature, and current, along with cell characteristics and application parameters are used to estimate capacity. The available capacity registers report a conservative estimate of the amount of charge that can be removed given the current temperature and discharge rate.
In addition to the nonvolatile (NV) storage for cell compensation and application parameters, 16 bytes of EEPROM memory is made available for the exclusive use of the host system and/or pack manufacturer. This facilitates battery lot and date tracking or NV storage of system or battery usage statistics.
A 1-Wire® interface provides serial communication at 16kbps or 143kbps to access data registers, control registers, and user memory. Additionally, 1-Wire communication enables challenge-response pack authentication using SHA-1 as the hash algorithm in a hash-based message authentication code (HMAC) authentication protocol.
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
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 (1)
Documentation & Resources
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DS2784 Reliability Data1/12/2023PDF11K
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Protection Circuitry for Reversed Charger Connections to the DS2784 High-Side nFET Protector5/7/2008
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Adding Thermal Protection to the DS2784 Stand-Alone Fuel Gauge3/26/2008
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Calibrating RSGAIN for the DS278x Family of Fuel Gauges9/11/2007
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Understanding the DS2784's Undervoltage-Protection Delay (tUVD)7/18/2007
Tools & Simulations
Software Development
Design Resources
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.
Support & Discussions
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Lead Times
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Evaluation Boards
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Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
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.