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PDF DS2780 Data sheet ( Hoja de datos )
| Número de pieza | DS2780 | |
| Descripción | Stand-Alone Fuel Gauge IC | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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GENERAL DESCRIPTION
The DS2780 measures voltage, temperature and
current, and estimates available capacity for
rechargeable Lithium Ion and Lithium Ion Polymer
batteries. Cell characteristics and application
parameters used in the calculations are stored in on-
chip 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 reported
in mAh remaining and percentage of full.
APPLICATIONS
Digital Still Cameras
Sub-Notebook Computers
Handheld PC Data Terminals
3G Multimedia Wireless Handsets
TYPICAL OPERATING CIRCUIT
PK+
DATA 150
5.6V
PK-
DS2780
DQ 5
4 VDD
PIO 8
3 VIN
NC 1
6 OVD
SNS 7
2 VSS
TSSOP-8
RSNS
500 1K
1 Cell
Li-Ion
Battery
0.1uF
Protection
Circuit
DS2780
Stand-Alone Fuel Gauge IC
FEATURES
§ Precision Voltage, Temperature, and Current
Measurement System
§ Accurate, Temperature Stable Internal Time
Base
§ 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 Tempco Calibration Allows the Use of
Low-Cost Sense Resistors
§ 24-Byte Battery/Application Parameter EEPROM
§ 16-Byte User EEPROM
§ Unique ID and Multidrop 1-WireÒ Interface
§ Tiny 8-pin TSSOP Package Embeds Easily in
Battery Packs Using Thin Prismatic Cells
PIN CONFIGURATION
TOP VIEW
TSSOP-8
NC
VSS
VIN
VDD
1
2
3
4
8 PIO
7 SNS
6 OVD
5 DQ
ORDERING INFORMATION
PART
MARKING
DS2780E
DS2780E/T&R
DS2780E+
DS2780E+T&R
2780
2780
2780
2780
PACKAGE INFORMATION
TSSOP
DS2780E, Tape-and-Reel
Lead-Free TSSOP
DS2780E+, Tape and Reel
1-Wire is a registered trademark of Dallas Semiconductor.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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REV: 120904
1 page  
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Figure 1. Block Diagram
DS2780 Stand-Alone Fuel Gauge IC
VDD
V POR
PIO
DQ
OVD
EN
BIAS/VREF
Timebase
1-Wire
Interface
Status
&
Control
Temp
&
Voltage
ADC
VIN
EEPROM
SNS
Accumulated
Current
Current ADC
15 bit + sign
Rate,
Temperature
Compensation
VSS
DETAILED DESCRIPTION
The DS2780 operates directly from 2.5V to 5.5V and supports single cell Lithium-ion battery packs. As shown in
Figure 2, the DS2780 accommodates multicell applications by adding a voltage regulator for VDD and voltage
divider for VIN. 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 serial polling required of the host processor.
Additionally, 16 bytes of EEPROM memory are made available for the exclusive use of the host system and/or
pack manufacturer. The additional EEPROM memory can be used to facilitate battery lot and date tracking and
non-volatile storage of system or battery usage statistics.
A Dallas 1-Wire interface provides serial communication at the standard 16kbps or overdrive 140kbps speeds
allows access to data registers, control registers and user memory. A unique, factory programmed 64-bit
registration number (8-bit family code + 48-bit serial number + 8-bit CRC) assures that no two parts are alike and
enables absolute traceability. The Dallas 1-Wire interface on the DS2780 supports multidrop capability so that
multiple slave devices may be addressed with a single pin.
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DS2780 Stand-Alone Fuel Gauge IC
CAPACITY ESTIMATION ALGORITHM
Remaining capacity estimation uses real-time measured values and stored parameters describing the cell
characteristics and application operating limits. The following diagram describes the algorithm inputs and outputs.
Figure 10. Top Level Algorithm Diagram
Voltage
(R)
Temperature (R)
Current
(R)
Accumulated
Current (ACR) (R/W)
Average Current (R)
Cell
Parameters
16 bytes
(EEPROM)
Aging Cap (AC)
(2 bytes EE)
Age Scalar (AS)
(1 bytes EE)
Sense Resistor’
(RSNSP) (1byte EE)
Charge Voltage
(VCHG) (1 byte EE)
Min Chg Current
(IMIN) (1 byte EE)
Active Empty
Voltage (VAE)
(1 byte EE)
Active Empty
Current (IAE)
(1 byte EE)
Capacity Look-up
Available Capacity Calculation
ACR Housekeeping
Age Estimator
Learn Function
FULL
FULL(T) (R)
Active Empty AE(T) (R)
Standby Empty SE(T) (R)
Remaining Active Absolute
Capacity (RAAC) mAh
(R)
Remaining Stand-by Absolute
Capacity (RSAC) mAh
(R)
Remaining Active Relative
Capacity (RARC) %
(R)
Remaining Stand-by Relative
Capacity (RSRC) %
(R)
MODELING CELL CHARACTERISTICS
In order to achieve reasonable accuracy in estimating remaining capacity, the cell performance characteristics over
temperature, load current, and charge termination point must be considered. Since the behavior of Li-ion cells is
non-linear, even over a limited temperature range of 10°C to 35°C, these characteristics must be included in the
capacity estimation to achieve a reasonable accuracy. See Applications Note AN131 “Li+ Fuel Gauging with Dallas
Semiconductor Devices” for general information on the FuelPack™ method used in the DS2780. To facilitate
efficient implementation in hardware, a modified version of the method outlined in AN131 is used to store cell
characteristics in the DS2780. Full and empty points are retrieved in a lookup process which re-traces a piece-wise
linear model. Three model curves are stored: Full, Active Empty and Standby Empty. Each model curve is
constructed with 4 line segments and spans from 0°C to 40°C. Operation outside the 0°C to 40°C model span is
supported by the model with minimal loss of accuracy. Above 40°C, the 40°C fixed points are extended with zero
slope. This achieves a conservative capacity estimate for temperatures above 40°C. Below 0°C, the model curves
are extended using the slope of each 0°C to 10°C segment. If low temperature operation is expected, the 0°C to
FuelPack is a trademark of Dallas Semiconductor.
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| PDF Descargar | [ Datasheet DS2780.PDF ] | |
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