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DS2784 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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DS2784 Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 38 page  1 of 38 REV: 071107 GENERAL DESCRIPTION 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 Smartphones/PDAs Digital Still and Video Cameras Cordless VOIP Phones Portable GPS Navigation Modes and commands are capitalized for clarity. 1-Wire is a registered trademark of Dallas Semiconductor, a wholly owned subsidiary of Maxim Integrated Products, Inc. FEATURES 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 PIN CONFIGURATION ORDERING INFORMATION PART TEMP RANGE TOP MARK PIN PACKAGE DS2784G+ -40°C to +85°C DS2784 14 TDFN (3mm x 5mm) DS2784G+T&R -40°C to +85°C DS2784 14 TDFN (3mm x 5mm) + Denotes a lead-free package. T&R = tape and reel DS2784 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication www.maxim-ic.com |
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