DS2775/DS2776/ 2-Cell, Fuel Gauge with FuelPack, DS2777/DS2778 Protector, and SHA-1 Authentication General Description Features The DS2775DS2778 report available capacity for High-Side nFET Drivers and Protection Circuitry rechargeable lithium-ion (Li+) and Li+ polymer (Li-Poly) Precision Voltage, Temperature, and Current batteries in mAh and as a percentage of full. Safe Measurement System operation is ensured by the integrated Li+ protector. Cell-Capacity Estimation from Coulomb The DS2776/DS2778 support SHA-1-based challenge- Count, Discharge Rate, Temperature, and Cell response authentication in addition to all other DS2775/ Characteristics DS2777 features. Estimates Cell Aging Between Learn Cycles Precision measurements of voltage, temperature, and Uses Low-Cost Sense Resistor current, along with a cell characteristics table and applica- tion parameters, are used for capacity estimation calcula- Allows Calibration of Gain and Temperature tions. The capacity registers report a conservative esti- Coefficient mate of the amount of charge that can be removed given Programmable Thresholds for Overvoltage and the current temperature, discharge rate, stored charge, Overcurrent and application parameters. Pack Authentication Using SHA-1 Algorithm The DS2775DS2778 operate from +4.0V to +9.2V (DS2776/DS2778) for direct integration into battery packs with two Li+ or 32-Byte Parameter EEPROM Li- Poly cells. 16-Byte User EEPROM In addition to nonvolatile storage for cell compensation and application parameters, the DS2775DS2778 offer Maxim 1-Wire Interface with 64-Bit Unique ID 16 bytes of EEPROM for use by the host system and/or (DS2775/DS2776) pack manufacturer to store battery lot and date tracking 2-Wire Interface with 64-Bit Unique ID information. The EEPROM can also be used for non- (DS2777/DS2778) volatile storage of system and/or battery usage statistics. 3mm x 5mm, 14-Pin TDFN Lead-Free Package A Maxim 1-Wire (DS2775/DS2776) or 2-wire (DS2777/ DS2778) interface provides serial communication to access measurement and capacity data registers, control DS2775/DS2776 Simple Fuel Gauge registers, and user memory. The DS2776/DS2778 use Circuit Diagram the SHA-1 hash algorithm in a challenge-response pack authentication protocol for battery-pack verification. Applications PK+ Health and Fitness Monitors Digital Still, Video, and Action Cameras 1k 150 1k 470 1k 1k Medical Devices CC SRC DC Handheld Computers and Terminals PLS V DD 150 DATA DQ V IN2 1k DS2775 Handheld Radios V IN1 DS2776 Home and Building Automation, Sensors PIO CP VB 0.47F 5.1V SNS V OVD SS Smart Batteries 0.1F 0.1F SRC Power Tools R SNS PK- Ordering Information appears at end of data sheet. Selector Guide appears at end of data sheet. 1-Wire is a registered trademark of Maxim Integrated Products, Inc. 19-4688 Rev 5 2/17DS2775/DS2776/ 2-Cell, Fuel Gauge with FuelPack, DS2777/DS2778 Protector, and SHA-1 Authentication Absolute Maximum Ratings Voltage Range on PLS, CP, CC, DC Pins Continuous Sink Current, PIO, DQ ....................................20mA Relative to V ..................................................-0.3V to +18V Continuous Sink Current, CC, DC......................................10mA SS Voltage Range on V , V , V , SRC Pins Operating Temperature Range ........................... -20C to +70C DD IN1 IN2 Relative to V .................................................-0.3V to +9.2V Storage Temperature Range ............................ -55C to +125C SS Voltage Range on All Other Pins Relative to V ..-0.3V to +6.0V Lead Temperature (soldering, 10s) .................................+300C SS Soldering Temperature (reflow) .......................................+260C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics (V = +4.0V to +9.2V, T = -20C to +70C, unless otherwise noted. Typical values are at T = +25C.) DD A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Sleep mode, T +50C 3 5 A I DD0 Sleep mode, T > +50C 10 A Supply Current A I Active mode 80 135 DD1 I Active mode during SHA-1 computation 120 300 DD2 Temperature Accuracy T -3 +3 C ERR 2.0V V 4.6V, 2.0V (V - V ) 4.6V, IN1 IN2 IN1 -35 +35 0C T +50C A Voltage Accuracy 2.0V V 4.6V, 2.0V (V V ) 4.6V, mV IN1 IN2 IN1 -22 22 T = +25C A 2.0V V 4.6V, 2.0V (V - V ) 4.6V -50 +50 IN1 IN2 IN1 Input Resistance (V , V ) 15 M IN1 IN2 Current Resolution I 1.56 V LSB Current Full Scale I -51.2 +51.2 mV FS Current Gain Error I -1 +1 % FS GERR Current Offset I 0C T +70C (Note 1) -9.375 9.375 Vh OERR A Accumulated Current Offset q 0C T +70C (Note 1) -255 0 Vh/Day OERR A 0C T +50C -2 +2 A Time-Base Error t % ERR -3 +3 CP Output Voltage (V - V ) V I = 0.9A 4.4 4.7 5 V CP SRC GS OUT CP Startup Time t CE = 0, DE = 0, C = 0.1F, active mode 200 ms SCP CP Output High: CC, DC V I = 100A (Note 2) V - 0.4 V OHCP OH CP Output Low: CC V I = 100A V + 0.1 V OLCC OL SRC Output Low: DC V I = 100A V + 0.1 V OLDC OL SRC DQ, PIO Voltage Range -0.3 +5.5 V DQ, PIO, SDA, SCL Input V 1.5 V IH Logic-High DQ, PIO, SDA, SCL Input V 0.6 V IL Logic-Low OVD Input Logic-High V V - 0.2 V IH BAT OVD Input Logic-Low V V + 0.2 V IL SS Maxim Integrated 2 www.maximintegrated.com