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PDF DS2782 Data sheet ( Hoja de datos )

Número de pieza DS2782
Descripción Stand-Alone Fuel Gauge IC
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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No Preview Available ! DS2782 Hoja de datos, Descripción, Manual

www.maxim-ic.com
GENERAL DESCRIPTION
The DS2782 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
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TYPICAL OPERATING CIRCUIT
Pack+
SDA
150
SCL
150
5.6V 5.6V
Pack-
DS2782
SDA 5
4 VDD
SCL 6
3 VIN
PIO 8
1 NC
SNS 7
2 VSS
TSSOP-8
RSNS
500 1K
1 Cell
Li-Ion
Battery
0.1uF
Protection
Circuit
DS2782
Stand-Alone Fuel Gauge IC
FEATURES
§ Precision Voltage, Temperature, and Current
Measurement System
§ Accurate 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 User EEPROM or 16-Byte User
EEPROM and Unique 64-bit ID
§ Industry 2-Wire Interface with Programmable
Slave Address
§ 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 SCL
5 SDA
ORDERING INFORMATION
PART
MARKING
DS2782E+
DS2782E+T&R
2782+
2782+
PACKAGE INFORMATION
Lead-Free TSSOP
DS2782E+, Tape-and-Reel
Note: To order devices with the unique 64-bit ID option, contact Maxim/Dallas Semiconductor sales.
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: 042505

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DS2782 pdf
DS2782: Stand-Alone Fuel Gauge IC
PIN DESCRIPTION
PIN NAME
FUNCTION
1 NC Not Connected. Pin not connected internally, float or connect to VSS.
2
VSS
Device Ground. Connect directly to the negative terminal of the battery cell. Connect the
sense resistor between VSS and SNS.
3 VIN Voltage Sense Input. The voltage of the battery cell is monitored through this input pin.
4
VDD
Power-Supply Input. Connect to the positive terminal of the battery cell through a
decoupling network.
Serial Data Input/Out. 2-Wire data line. Open-drain output driver. Connect this pin to the
5
SDA
DATA terminal of the battery pack. Pin has an internal pull-down (IPD) for sensing
disconnection.
6
SCL
Serial Clock Input. 2-Wire clock line. Input only. Connect this pin to the CLOCK terminal
of the battery pack. Pin has an internal pull-down (IPD) for sensing disconnection.
7
SNS
Sense Resistor Connection. Connect to the negative terminal of the battery pack.
Connect the sense resistor between VSS and SNS.
Programmable I/O Pin. Can be configured as input or output to monitor or control user-
8 PIO defined external circuitry. Output driver is open drain. This pin has an weak internal
pulldown (IPD).
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DS2782 arduino
Figure 8. Accumulated Current Register Format, ACR
DS2782: Stand-Alone Fuel Gauge IC
ACR
MSB—Address 10h
215 214 213 212 211 210 29 28
MSb
LSb
R/W & EE
LSB—Address 11h
27 26 25 24 23 22 21 20
MSb
LSb
Units:
6.25mVh/Rsns
Figure 9. Fractional/Low Accumulated Current Register Format, ACRL
ACRL
MSB—Address 12h
211 210 29 28 27 26 25 24
MSb
LSb
“X”: reserved
Read Only
LSB—Address 13h
23 22 21 20 X X X X
MSb
LSb
Units:1.526nVHr/RSNS
VSS -
VSNS
6.25mVh
20mW
312.5mAh
ACR LSb
RSNS
15mW
10mW
416.7mAh
625mAh
5mW
1.250mAh
VSS -
VSNS
±409.6mVh
20mW
±20.48Ah
ACR RANGE
RSNS
15mW
10mW
±27.30Ah ±40.96Ah
5mW
±81.92Ah
ACCUMULATION BIAS
The Accumulation Bias register (AB) allows an arbitrary bias to be introduced into the current-accumulation
process. The AB can be used to account for currents that do not flow through the sense resistor, estimate currents
too small to measure, estimate battery self-discharge or correct for static offset of the individual DS2782 device.
The AB register allows a user programmed constant positive or negative polarity bias to be included in the current
accumulation process. The user-programmed two’s compliment value, with bit weighting the same as the current
register, is added to the ACR once per current conversion cycle. The AB value is loaded on power-up from
EEPROM memory. The format of the AB register is shown in Figure 10.
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