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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 ud in the calculations are stored in on-
chip EEPROM. The available capacity registers
report a conrvative 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
FEATURES
Precision Voltage, Temperature, and Current
Measurement System
Operates in One-Cell or Two--Cell Applications
Accurate, Temperature Stable Internal Timeba
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蕈树
Allows the U of Low-Cost Sen Resistors
24-Byte Parameter EEPROM
16-Byte Ur EEPROM
Unique ID and Multidrop 1-Wire® Interface
Tiny 8-Pin TSSOP and 10-Pin TDFN (3mm x
摩登家庭第3季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 = Expod pad.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
qs世界大学排名2017DS2781
1-Cell or 2-Cell Stand-Alone
Fuel Gauge IC
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V DD , V IN Relative to V SS -0.3V to +12V Voltage Range on Any Pin Relative to V SS -0.3V to +6.0V
Continuous Sink Current, DQ, PIO 20mA
riotsOperating Temperature Range -40°C to +85°C Storage Temperature Range -55°C to +125°C
Soldering Temperature
Refer to the IPC/JEDEC J-STD-020 Specification.
Stress beyond tho listed under “Absolute Maximum Ratings” may cau permanent damage to the device. The are stress ratings only, and functional operation of the device at the or any other conditions beyond tho indicated in the operational ctions 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 DD = 2.5V to 10V, T A = -20°C to +70°C, unless otherwi noted. Typical values are at T A = +25°C)polycarbonate
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage
V DD (Note 1) +2.5 +10 V
V IN Voltage Range (Note 1) -0.3 V DD + 0.3 V DQ, PIO Voltage Range (Note 1) -0.3
+5.5
V
VB Output Voltage V VB V DD > 3.0V,
I VB = 500μA, (Note 1) 2.5 2.8 3.1 V OVD Voltage Range
(Note 1)
-0.3
V VB + 0.3
V
DC ELECTRICAL CHARACTERISTICS
(V DD = 2.5V to 10V, T A = -20°C to +70°C, unless otherwi noted. Typical values are at T A = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ACTIVE Current I ACTIVE I VB = 0
70 95 μA T A > +50°C, I VB = 0 10 SLEEP Mode Current I SLEEP
I VB = 0, (Note 5)
3
5
μA
Input Logic-High:DQ, PIO
V IH (Note 1) 1.5 V Input Logic-Low: DQ, PIO V IL (Note 1) 0.6 V Output Logic-Low: DQ, PIO V OL I OL = 4mA (Note 1) 0.4 V Pulldown Current: DQ, PIO I PD V DQ , V PIO = 0.4V 0.2 μA Input Logic-High: OVD V IH (Note 1) V VB - 0.2 V Input Logic-Low: OVD V IL (Note 1) V SS + 0.2 V V IN Input Resistance R IN 15 M Ω DQ Capacitance C DQ (Note 4) 50 pF DQ SLEEP Timeout t SLEEP DQ < V IL 1.5 2 2.5 s
UVTH = 1, (Note 1) 4.8 4.9 5.0
Undervoltage SLEEP Threshold V SLEEP
UVTH = 0, (Note 1) 2.40 2.45 2.50
V
ELECTRICAL CHARACTERISTICS: TEMPERATURE, VOLTAGE, CURRENT
(V DD = 2.5V to 10V, T A = -20°C to +70°C, unless otherwi noted. Typical values are at T A = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Temperature Resolution T LSB 0.125 °C
Temperature Error T ERR
±3 °C
Voltage Resolution
V LSB
9.76 mV
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Voltage Full-Scale V FS 0 9.9902 V Voltage Error V ERR
±100 mV
Current Resolution I LSB 1.56 µV Current Full-Scale I FS ±51.2 mV
Current Gain Error I GERR (Note 2) ±1
% Full-Scale Current Offt Error I OERR 0°C ≤ T A ≤ +70°C,
(Note 4)
- 7.82 + 12.5 μV Accumulated Current Offt q OERR 0°C ≤ T A ≤ +70°C,
V SNS = V SS (Notes 3, 4) - 188 + 0 μVhr/ day
T A = +25°C, V DD = 7.6V
±1
nj
Timeba Error t ERR
exercid±2
%
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ELECTRICAL CHARACTERISTICS: 1-WIRE INTERFACE, STANDARD
(V DD = 2.5V to 10V, T A = -20°C to +70°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Time Slot t SLOT 60 120 μs Recovery Time t REC 1 μs Write-0 Low Time t LOW0 60 120 μs Write-1 Low Time t LOW1 1 15 μs Read Data Valid t RDV 15 μs Ret Time High t RSTH 480 μs Ret Time Low t RSTL 480 960 μs Prence Detect High t PDH 15 60 μs Prence Detect Low t PDL 60 240 μs
ELECTRICAL CHARACTERISTICS: 1-Wire INTERFACE, OVERDRIVE
(V DD = 2.5V to 10V, T A = -20°C to +70°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Time Slot t SLOT 6 16 μs Recovery Time t REC 1 μs Write-0 Low Time t LOW0 6 16 μs Write-1 Low Time t LOW1 1 2 μs Read Data Valid t RDV 2 μs Ret-Time High t RSTH 48 μs Ret-Time Low t RSTL 48 80 μs Prence-Detect High t PDH 2 6 μs Prence-Detect Low t PDL 8 24 μs
EEPROM RELIABILITY SPECIFICATION
(V DD = 2.5V to 10V, T A = -20°C to +70°C, unless otherwi noted. Typical values are at T A = +25°C.)
PARAMETER SYMBOL
CONDITIONS MIN
TYP
MAX
UNITS EEPROM Copy Time t EEC15 ms EEPROM Copy Endurance N EEC T A = +50°C 50,000 cycles
Note 1: All voltages are referenced to V SS.
Note 2: Factory calibrated accuracy. Higher accuracy can be achieved by in-system calibration by the ur.
Note 3: Accumulation Bias register t to 00h. Current Offt Bias register t to 00h. NBEN bit = 0.
Note 4: Parameters guaranteed by design.
Note 5: Internal voltage regulator active.
PIN DESCRIPTION
PIN
TSSOP TDFN-EP
NAME FUNCTION
1 1 VB Internal
Supply. Bypass to V SS with a 0.1µF capacitor.
2 2,
considerably3 V SS Device Ground. Connect directly to the negative terminal of the cell stack. Connect the n resistor between V SS and SNS.
3 4 V IN Voltage Sen Input. The voltage of the battery pack is monitored through this input pin with respect to the V SS pin.
4 5 V DD Power-Supply Input. Connect to the positive terminal of the battery pack through a decoupling network.
5 6 DQ Data Input/Output. 1-Wire data line. Open-drain output driver. Connect this pin to the DATA terminal of the battery pack. This pin has a weak internal pulldown (I PD) for nsing pack disconnection from host or charger.
6 7 OVD 1-Wire Bus Speed Control.Input logic level lects the speed of the 1-Wire bus. Logic 1 lects overdrive (OVD) and logic 0 lects standard timing (STD). On a multidrop bus, all devices must operate at the same speed.
— 8 N.C.No Connection
7 9 SNS Sen Resistor Connection. Connect to the negative terminal of the battery pack. Connect the n resistor between V SS and SNS.
8 10 PIO Programmable I/O Pin. Can be configured as input or output to monitor or control ur-defi
ned external circuitry. Output driver is open drain. This pin has a weak internal pulldown (I PD).
— EP EP Expod
Pad.
Connect to V SS or leave floating.
Figure 1. Block Diagram
DETAILED DESCRIPTION
The DS2781 operates directly from 2.5V to 10V and supports single or dual cell Lithium-ion battery packs. Nonvolatile storage is provided for cell compensation and application parameters. Host side development of fuel-gauging algorithms is eliminated. On-chip algorithms and convenient status reporting of operating conditions reduce the rial polling required of the host processor.
Additionally, 16 bytes of EEPROM memory are made available for the exclusive u of the host system and/or pack manufacturer. The additional EEPROM memory can be ud to facilitate battery lot and date tracking and non-volatile storage of system or battery usage statistics.
A Maxim 1-Wire interface provides rial communication at the standard 16kbps or overdrive 140kbps speeds allows access to data registers, control registers and ur memory. A unique, factory programmed 64-bit registration number (8-bit family code + 48-bit rial number + 8-bit CRC) assures that no two parts are alike and enables absolute traceability. The Maxim 1-Wire interface on the DS2781 supports multidrop capability so that multiple slave devices may be addresd with a single pin.
