DS2784 1-Cell Fuel Gauge with FuelPack, Protector, and SHA-1 Authentication General Description Features The DS2784 operates from 2.5V to 4.6V for integration in Precision Voltage, Temperature, and Current battery packs using a single lithium-ion (Li+) or Li+ poly- Measurement System mer cell. Available capacity is reported in mAh and as a Available Capacity Estimated from Coulomb percentage. Safe operation is ensured with the included Count, Discharge Rate, Temperature, and Cell Li+ protection function and SHA-1-based challenge- Characteristics response authentication. Estimates Cell Aging Using Learn Cycles Precision measurements of voltage, temperature, and Uses Low-Cost Sense Resistor current, along with cell characteristics and application Allows for Calibration of Gain and Temperature parameters are used to estimate capacity. The available capacity registers report a conservative estimate of the Coefficient amount of charge that can be removed given the current Li+ Safety CircuitryOvervoltage, Undervoltage, temperature and discharge rate. Overcurrent, Short-Circuit Protection In addition to the nonvolatile (NV) storage for cell compen- Programmable Safety Thresholds for Overvoltage sation and application parameters, 16 bytes of EEPROM and Overcurrent memory is made available for the exclusive use of the Authentication Using SHA-1 Algorithm and 64-Bit host system and/or pack manufacturer. This facilitates Secret battery lot and date tracking or NV storage of system or 32-Byte Parameter EEPROM battery usage statistics. 16-Byte User EEPROM A 1-Wire interface provides serial communication at 16kbps or 143kbps to access data registers, control Maxim 1-Wire Interface with 64-Bit Unique ID registers, and user memory. Additionally, 1-Wire com- Tiny, Pb-Free, 14-Pin TDFN Package Embeds Easily munication enables challenge-response pack authentica- in Battery Packs Using Thin Prismatic Cells tion using SHA-1 as the hash algorithm in a hash-based message authentication code (HMAC) authentication protocol. Applications Simple Fuel Gauge Circuit Diagram Health and Fitness Monitors Digital Still, Video, and Action Cameras Medical Devices Handheld Computers and Terminals PK+ Handheld Radios Home and Building Automation, Sensors 1K 1K 1K Smart Batteries 150 1K Power Tools DC CC PLS VDD 150 VIN DATA DS2784 DQ CP PIO CTG Ordering Information appears at end of data sheet. SNS VSS 0.1F 0.1F 5.1V RSNS PK- Modes and commands are capitalized for clarity. 1-Wire is a registered trademark of Maxim Integrated Products, Inc. 19-4636 Rev 5 1/17DS2784 1-Cell Fuel Gauge with FuelPack, Protector, and SHA-1 Authentication Absolute Maximum Ratings Voltage Range on PLS Pin Relative to V ..........-0.3V to +18V Maximum Voltage Range on SS Voltage Range on CP Pin Relative to V ...........-0.3V to +12V V Pin Relative to V ........................................ V + 0.3V SS IN DD DD Voltage Range on DC Continuous Sink Current, PIO, DQ ....................................20mA Pin Relative to V ...............................-0.3V to (V + 0.3V) Continuous Sink Current, CC, DC......................................10mA SS CP Voltage Range on CC Operating Temperature Range ........................... -40C to +85C Pin Relative to V .........................V - 0.3V to V + 0.3V Storage Temperature Range ............................ -55C to +125C SS DD CP Voltage Range on All Lead Temperature (soldering,10s) ..................................300C Other Pins Relative to V ...............................-0.3V to +6.0V Soldering Temperature (reflow) .......................................+260C SS This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Electrical Characteristics (V = 2.5V to 4.6V, T = -20C to +70C, unless otherwise noted. Typical values are at T = +25C.) DD A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 1) +2.5 +4.6 V DD I Sleep mode 1 4 DD0 I Sleep mode, V = 2.5V 0C to +50C 0.4 1.5 DD1 DD Supply Current A I Active mode 85 125 DD2 I Active mode during SHA computation 300 500 DD3 Temperature Accuracy -3 +3 C Temperature Resolution 0.125 C Temperature Range -128.000 +127.875 C 4.0 V 4.6, V V + 0.3V -30 30 IN IN DD Voltage Accuracy, V mV IN 2.5 V 4.6V, V V + 0.3V -50 +50 IN IN DD Voltage Resolution, V 4.88 mV IN Voltage Range, V 0 4.6 V IN Input Resistance, V 15 M IN Current Resolution 1.56 V Current Full Scale -51.2 +51.2 mV % full Current Gain Error -1 +1 scale Current Offset (Notes 2, 3, 4) -15 +25 V Accumulated Current Offset (Notes 2, 3, 4) -360 0 Vh/day 0C T +50C -2 +2 A Time Base Error % -3 +3 CP Output Voltage V I + I = 0.9A 8.50 9.25 10.00 V CP CC DC CP Startup Time t CE = 0, DE = 0, C = 0.1F, Active mode 200 ms SCP CP V V - OHCC CP Output High: CC, DC V I = -100A (Note 5) OH V 0.4 OHDC V + DD Output Low: CC V V I = 100A OLCC OL 0.1 Maxim Integrated 2 www.maximintegrated.com