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DS2781 Dataheets PDF



Part Number DS2781
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description 1-Cell or 2-Cell Standalone Fuel Gauge
Datasheet DS2781 DatasheetDS2781 Datasheet (PDF)

DS2781 1-Cell or 2-Cell Stand-Alone Fuel Gauge IC GENERAL DESCRIPTION The DS2781 measures voltage, temperature, and current, and estimates available capacity for rechargeable Lithium-Ion and Lithium-Ion Polymer batteries. Cell stack characteristics and application parameters used in the calculations are stored in onchip EEPROM. The available capacity registers report a conservative estimate of the amount of charge that can be removed given the current temperature, discharge rate, stored charge .

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DS2781 1-Cell or 2-Cell Stand-Alone Fuel Gauge IC GENERAL DESCRIPTION The DS2781 measures voltage, temperature, and current, and estimates available capacity for rechargeable Lithium-Ion and Lithium-Ion Polymer batteries. Cell stack characteristics and application parameters used in the calculations are stored in onchip EEPROM. The available 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. Capacity estimation is reported in milliamp hours remaining and percentage of full. APPLICATIONS Digital Video Cameras Commercial Two-Way Radios Industrial PDAs and Handheld PC Data Terminals Portable GPS Navigation Systems SIMPLIFIED TYPICAL OPERATING CIRCUIT P+ DS2781 DQ DQ VDD PIO VIN OVD VB SNS VSS P- Protection Circuit ORDERING INFORMATION PART PIN-PACKAGE DS2781E+ 8 TSSOP DS2781E+T&R 8 TSSOP DS2781G+ 10 TDFN-EP* DS2781G+T&R 10 TDFN-EP* +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. PIN CONFIGURATIONS TOP VIEW VB VSS VIN VDD TSSOP-8 PIO SNS OVD DQ VB VSS VSS VIN VDD PAD PIO SNS NC OVD DQ 3mm x 4mm TDFN-10 FEATURES Precision Voltage, Temperature, and Current Measurement System Operates in One-Cell or Two--Cell Applications Accurate, Temperature Stable Internal Timebase Absolute and Relative Capacity Estimated from Coulomb Count, Discharge Rate, Temperature, and Battery Cell Characteristics Accurate Warning of Low Battery Conditions Automatic Backup of Coulomb Count and Age Estimation to Nonvolatile (NV) EEPROM Gain and Temperature Coefficient Calibration Allows the Use of Low-Cost Sense Resistors 24-Byte Parameter EEPROM 16-Byte User EEPROM Unique ID and Multidrop 1-Wire® Interface Tiny 8-Pin TSSOP and 10-Pin TDFN (3mm x 4mm) Packages Embed Easily in Thin Prismatic Cell Packs TOP MARK 2781 2781 2781 2781 1 of 31 REV: 062708 DS2781 ABSOLUTE MAXIMUM RATINGS Voltage Range on VDD, VIN Relative to VSS Voltage Range on Any Pin Relative to VSS Continuous Sink Current, DQ, PIO Operating Temperature Range Storage Temperature Range Soldering Temperature -0.3V to +12V -0.3V to +6.0V 20mA -40°C to +85°C -55°C to +125°C 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 (VDD = 2.5V to 10V, TA = -20°C to +70°C, unless otherwise noted. Typical values are at TA = +25°C) PARAMETER SYMBOL CONDITIONS MIN TYP MAX Supply Voltage VIN Voltage Range DQ, PIO Voltage Range VB Output Voltage OVD Voltage Range VDD (Note 1) (Note 1) (Note 1) VDD > 3.0V, VVB IVB = 500μA, (Note 1) (Note 1) +2.5 -0.3 -0.3 2.5 -0.3 +10 VDD + 0.3 +5.5 2.8 3.1 VVB + 0.3 UNITS V V V V V DC ELECTRICAL CHARACTERISTICS (VDD = 2.5V to 10V, TA = -20°C to +70°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX ACTIVE Current SLEEP Mode Current Input Logic-High:DQ, PIO Input Logic-Low: DQ, PIO Output Logic-Low: DQ, PIO Pulldown Current: DQ, PIO Input Logic-High: OVD Input Logic-Low: OVD VIN Input Resistance DQ Capacitance DQ SLEEP Timeout Undervoltage SLEEP Threshold IACTIVE ISLEEP VIH VIL VOL IPD VIH VIL RIN CDQ tSLEEP VSLEEP IVB = 0 TA > +50°C, IVB = 0 IVB = 0, (Note 5) (Note 1) (Note 1) IOL = 4mA (Note 1) VDQ, VPIO = 0.4V (Note 1) (Note 1) (Note 4) DQ < VIL UVTH = 1, (Note 1) UVTH = 0, (Note 1) 70 3 1.5 VVB - 0.2 15 1.5 4.8 2.40 0.2 50 2 4.9 2.45 95 10 5 0.6 0.4 VSS + 0.2 2.5 5.0 2.50 UNITS μA μA V V V μA V V MΩ pF s V ELECTRICAL CHARACTERISTICS: TEMPERATURE, VOLTAGE, CURRENT (VDD = 2.5V to 10V, TA = -20°C to +70°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX Temperature Resolution Temperature Error Voltage Resolution TLSB TERR VLSB 0.125 9.76 ±3 2 of 31 UNITS °C °C mV DS2781 PARAMETER Voltage Full-Scale Voltage Error Current Resolution Current Full-Scale Current Gain Error Current Offset Error Accumulated Current Offset Timebase Error SYMBOL VFS VERR ILSB IFS IGERR IOERR qOERR tERR CONDITIONS (Note 2) 0°C ≤ TA ≤ +70°C, (Note 4) 0°C ≤ TA ≤ +70°C, VSNS = VSS (Notes 3, 4) TA = +25°C, VDD = 7.6V MIN 0 - 7.82 - 188 TYP 1.56 MAX 9.9902 ±100 ±51.2 ±1 + 12.5 +0 ±1 ±2 UNITS V mV µV mV % FullScale μV μVhr/ day % ELECTRICAL CHARACTERISTICS: 1-WIRE INTERFACE, STANDARD (VDD = 2.5V to 10V, TA = -20°C to +70°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX Time Slot Recovery Time Write-0 .


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