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DS2775 Dataheets PDF



Part Number DS2775
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description 2-Cell Stand-Alone Li+ Fuel-Gauge
Datasheet DS2775 DatasheetDS2775 Datasheet (PDF)

19-4688; Rev 3; 5/10 www.DataSheet4U.com 2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with Protector and Optional SHA-1 Authentication 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 operation is ensured by the integrated Li+ protector. The DS2776/DS2778 support SHA-1-based challengeresponse authentication in addition to all other DS2775/ DS2777 features. Precision measurem.

  DS2775   DS2775



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19-4688; Rev 3; 5/10 www.DataSheet4U.com 2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with Protector and Optional SHA-1 Authentication 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 operation is ensured by the integrated Li+ protector. The DS2776/DS2778 support SHA-1-based challengeresponse 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 LiPoly 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. 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 DS2775/DS2776/DS2777/DS2778 Ordering Information PART DS2775G+ DS2775G+T&R DS2776G+ DS776G+T&R DS2777G+ DS2777G+T&R DS2778G+ DS2778G+T&R PIN-PACKAGE 14 TDFN-EP* 14 TDFN-EP* 14 TDFN-EP* 14 TDFN-EP* 14 TDFN-EP* 14 TDFN-EP* 14 TDFN-EP* 14 TDFN-EP* TOP MARK D2775 D2775 D2776 D2776 D2777 D2777 D2778 D2778 Applications Low-Cost Notebooks UMPCs DSLR Cameras Video Cameras Commercial and Military Radios Portable Medical Equipment Selector Guide appears at end of data sheet. Note: All devices are specified over the -20°C to +70°C operating temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. T&R = Tape and reel. *EP = Exposed pad. 1-Wire is a registered trademark of Maxim Integrated P.


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