DS2781 1-Cell or 2-Cell Stand-Alone Fuel Gauge IC GENERAL DESCRIPTION PIN CONFIGURATIONS The DS2781 measures voltage, temperature, and TOP VIEW current, and estimates available capacity for VB PIO rechargeable Lithium-Ion and Lithium-Ion Polymer VSS SNS batteries. Cell stack characteristics and application VIN OVD parameters used in the calculations are stored in on- VDD DQ chip EEPROM. The available capacity registers TSSOP-8 report a conservative estimate of the amount of charge that can be removed given the current VB PIO temperature, discharge rate, stored charge and VSS SNS application parameters. Capacity estimation is VSS PAD NC reported in milliamp hours remaining and percentage VIN OVD of full. DQ VDD 3mm x 4mm TDFN-10 APPLICATIONS Digital Video Cameras FEATURES Commercial Two-Way Radios Precision Voltage, Temperature, and Current Industrial PDAs and Handheld PC Data Terminals Measurement System Portable GPS Navigation Systems Operates in One-Cell or Two--Cell Applications Accurate, Temperature Stable Internal Timebase SIMPLIFIED TYPICAL OPERATING Absolute and Relative Capacity Estimated from CIRCUIT Coulomb Count, Discharge Rate, Temperature, and Battery Cell Characteristics P+ Accurate Warning of Low Battery Conditions DS2781 Automatic Backup of Coulomb Count and Age DQ DQ VDD Estimation to Nonvolatile (NV) EEPROM PIO VIN Gain and Temperature Coefficient Calibration OVD VB Allows the Use of Low-Cost Sense Resistors SNS VSS 24-Byte Parameter EEPROM 16-Byte User EEPROM P- Protection Unique ID and Multidrop 1-Wire Interface Circuit Tiny 8-Pin TSSOP and 10-Pin TDFN (3mm x 4mm) Packages Embed Easily in Thin Prismatic Cell Packs ORDERING INFORMATION PART PIN-PACKAGE TOP MARK DS2781E+ 8 TSSOP 2781 DS2781E+T&R 8 TSSOP 2781 DS2781G+ 10 TDFN-EP* 2781 DS2781G+T&R 10 TDFN-EP* 2781 +Denotes a lead-free/RoHS-compliant package. T&R = Tape and reel. *EP = Exposed pad. 1-Wire is a registered trademark of Maxim Integrated Products, Inc. 1 of 31 REV: 062708 DS2781 ABSOLUTE MAXIMUM RATINGS Voltage Range on V , V Relative to V -0.3V to +12V DD IN SS Voltage Range on Any Pin Relative to V -0.3V to +6.0V SS Continuous Sink Current, DQ, PIO 20mA Operating Temperature Range -40C to +85C Storage Temperature Range -55C to +125C Soldering Temperature Refer to the IPC/JEDEC J-STD-020 Specification. 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 the absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED DC OPERATING CHARACTERISTICS (V = 2.5V to 10V, 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 +10 V DD V Voltage Range (Note 1) -0.3 V + 0.3 V IN DD DQ, PIO Voltage Range (Note 1) -0.3 +5.5 V V > 3.0V, DD VB Output Voltage V 2.5 2.8 3.1 V VB I = 500 A, VB (Note 1) OVD Voltage Range (Note 1) -0.3 V + 0.3 V VB DC ELECTRICAL CHARACTERISTICS (V = 2.5V to 10V, T = -20C to +70C, unless otherwise noted. Typical values are at T = +25C.) DD A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ACTIVE Current I I = 0 70 95 A ACTIVE VB T > +50C, I = 0 10 A VB SLEEP Mode Current I A SLEEP I = 0, (Note 5) 3 5 VB Input Logic-High:DQ, PIO V (Note 1) 1.5 V IH Input Logic-Low: DQ, PIO V (Note 1) 0.6 V IL Output Logic-Low: DQ, PIO V I = 4mA (Note 1) 0.4 V OL OL Pulldown Current: DQ, PIO I V , V = 0.4V 0.2 A PD DQ PIO Input Logic-High: OVD V (Note 1) V - 0.2 V IH VB Input Logic-Low: OVD V (Note 1) V + 0.2 V IL SS V Input Resistance R 15 M IN IN DQ Capacitance C (Note 4) 50 pF DQ DQ SLEEP Timeout t DQ < V 1.5 2 2.5 s SLEEP IL Undervoltage SLEEP UVTH = 1, (Note 1) 4.8 4.9 5.0 V V SLEEP Threshold UVTH = 0, (Note 1) 2.40 2.45 2.50 ELECTRICAL CHARACTERISTICS: TEMPERATURE, VOLTAGE, CURRENT (V = 2.5V to 10V, T = -20C to +70C, unless otherwise noted. Typical values are at T = +25C.) DD A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Temperature Resolution T 0.125 C LSB Temperature Error T 3 C ERR Voltage Resolution V 9.76 mV LSB 2 of 31