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DS2778GR Datasheet(PDF) 1 Page - Maxim Integrated Products |
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DS2778GR Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 46 page General Description 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 oper- ation 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 estima- tion calculations. The capacity registers report a con- servative 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 non- volatile storage of system and/or battery usage statis- tics. A Maxim 1-Wire® (DS2775/DS2776) or 2-wire (DS2777/DS2778) interface provides serial communica- tion to access measurement and capacity data regis- ters, 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 Low-Cost Notebooks UMPCs DSLR Cameras Video Cameras Commercial and Military Radios Portable Medical Equipment 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 2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with Protector and Optional SHA-1 Authentication ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-4688; Rev 4; 6/11 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART PIN-PACKAGE TOP MARK DS2775G+ 14 TDFN-EP* D2775 DS2775G+T&R 14 TDFN-EP* D2775 DS2776G+ 14 TDFN-EP* D2776 DS776G+T&R 14 TDFN-EP* D2776 DS2777G+ 14 TDFN-EP* D2777 DS2777G+T&R 14 TDFN-EP* D2777 DS2778G+ 14 TDFN-EP* D2778 DS2778G+T&R 14 TDFN-EP* D2778 Note: All devices are specified over the -20°C to +70°C oper- ating temperature range. + Denotes a lead(Pb)-free/RoHS-compliant package. T&R = Tape and reel. * EP = Exposed pad. Selector Guide appears at end of data sheet. 1-Wire is a registered trademark of Maxim Integrated Products, Inc. |
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