DS2784
PRODUCTION1-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
- Part Models
- 2
- 1ku List Price
- Starting From $6.57
Overview
- 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
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
Documentation
Data Sheet 1
Design Note 4
Technical Articles 3
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 |
|---|---|---|---|
| DS2784G+ | Thin Dual Flatpack No Leads | ||
| DS2784G+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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Request a Driver/SoftwareTools & Simulations
Software Development 2
Evaluation Kits
Evaluation Kit for the DS2784
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