DS2777 Datasheet PDF | Maxim Integrated

Maxim Integrated DS2777

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. The DS2776/DS2778 support SHA-1-based challengeresponse authentication in addition to all other DS2775/ DS2777 features. 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.

Part No.	DS2777
Datasheet	DS2777 Download
Manufacturer	Maxim Integrated
Description	2-Cell Stand-Alone Li+ Fuel-Gauge
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GENERAL DESCRIPTION

Safe operation is ensured by the integrated Li+ protector. Precision measurements of voltage, temperature, and current, along with a cell characteristics table and application parameters, are used for capacity estimation calculations. 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.