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Maxim Integrated Semiconductor Electronic Components Datasheet

DS2786 Datasheet

Standalone OCV-Based Fuel Gauge

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DS2786 pdf
www.maxim-ic.com
GENERAL DESCRIPTION
The DS2786 estimates available capacity for
rechargeable Li-Ion and Li-Ion Polymer batteries
based on the cell voltage in the open-circuit state
following a relaxation period. The open-circuit voltage
(OCV) is used to determine relative cell capacity
based on a lookup table stored in the IC. This
capability makes accurate capacity information
available immediately after a battery pack is inserted.
During periods of moderate to high rate discharging,
which preclude OCV measurements, the DS2786
uses coulomb counting as a secondary means of
estimating relative capacity.
Remaining capacity is reported in percent, along with
cell voltage, current and temperature information.
Cell characteristics and application parameters used
in the calculations are stored in on-chip EEPROM.
The DS2786 is intended for use on the host side of
portable devices, though it can also be mounted
within a battery pack. Measurement and estimated
capacitywww.DataSheet4U.com data are accessed through an I2C interface.
Temperature data is available from an on-die sensor.
Resistance measurements of a pack identification
resistor and pack thermistor are supported by
ratiometric measurements on two auxiliary inputs.
APPLICATIONS
3G Multimedia Wireless Handsets
Digital Still Cameras
Digital Audio (MP3) Players
TYPICAL OPERATING CIRCUIT
DS2786
Standalone OCV-Based Fuel Gauge
FEATURES
ƒ Relative Capacity Calculated from
Combination Coulomb Counter and Open-
Circuit Cell Voltage (OCV) Battery Model
ƒ Accurate Warning of Low Battery Conditions
Even On First Cycle (No Learn Cycle Needed)
ƒ 12-Bit Battery Voltage Measurement:
±10mV Accuracy
1.22mV LSB, 0V to 5V Input Range
ƒ 11-Bit Bidirectional Current Measurement:
25μV LSB, ±51.2mV Dynamic Range
1.67mA LSB, ±3.4A (RSNS = 15mΩ)
ƒ Current Accumulation Measurement
Resolution:
±204.8mVh Range
±13.65Ah (RSNS = 15mΩ)
ƒ Internal Temperature Measurement:
0.125°C LSB, ±3°C Accuracy
ƒ Two 11-Bit Aux Input Voltage Measurements:
±8 LSB Accuracy, Ratiometric Inputs
Eliminate Supply Accuracy Issues
ƒ VOUT Pin Drives Resistive Dividers, Reduces
Current Consumption
ƒ 2-Wire Interface
ƒ Low Power Consumption:
Active Current: 50μA typ, 80μA max
Sleep Current: 1μA typ, 3μA max
ORDERING INFORMATION
PART
DS2786G+
DS2786G+T&R
TEMP RANGE
-20ºC to +70ºC
-20ºC to +70ºC
PIN-PACKAGE
10-pin 3mm×3mm
TDFN
DS2786G+ in
Tape-and-Reel
+ Denotes lead-free package.
PIN CONFIGURATION
Commands, Registers, and Modes are capitalized for clarity.
1 of 21
3mm x 3mm TDFN-10
Top View
050907


Maxim Integrated Semiconductor Electronic Components Datasheet

DS2786 Datasheet

Standalone OCV-Based Fuel Gauge

No Preview Available !

DS2786 pdf
ABSOLUTE MAXIMUM RATINGS*
Voltage on All Pins Except VPROG Relative to VSS
Voltage on VPROG Relative to VSS
Operating Temperature Range
Storage Temperature Range
Soldering Temperature
DS2786 Standalone OCV-Based Fuel Gauge
-0.3V to +6V
-0.3V to +18V
-40°C to +85°C
-55°C to +125°C
See IPC/JEDECJ-STD-020A
* This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the
operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of
time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS
(2.5V VDD 5.5V, TA = -20°C to +70°C.)
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage
Data I/O Pins
VDD (Note 1)
SCL, SDA (Note 1)
Programmable I/O Pin
PIO (Note 1)
VIN, AIN0, AIN1 Pin
VIN, AIN0,
AIN1
(Note 1)
MIN
+2.5
-0.3
-0.3
-0.3
TYP
MAX
+5.5
+5.5
+5.5
VDD + 0.3
UNITS
V
V
V
V
DC ELECTRICAL CHARACTERISTICS
(2.5V VDD 4.5V, TA = -20°C to +70°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Active Current
Sleep-Mode Current
Current Measurement
Resolution
Current Measurement
Full-Scale Magnitude
Current Measurement
Offset Error
Current Measurement
Gain Error
IACTIVE
ISLEEP
ILSB
IFS
IOERR
IGERR
VDD = 5.5V
VDD = 2.0V,
SCL, SDA = VSS
SCL, SDA = VSS
DS2786
(Note 1)
DS2786 (Note 2)
VDD = 3.6V at +25°C
MIN
TYP
MAX UNITS
50 75
μA
80
0.3 1.0
13
μA
25 μV
±51.2
mV
-50 +50 μV
-1.5
+1.5
% of
reading
-1 +1
Timebase Accuracy
Voltage Error
Input Resistance
VIN, AIN0, AIN1
AIN0, AIN1 Error
tERR
VGERR
RIN
TA = 0°C to +70°C
TA = -20°C to +70°C
VDD = VIN = 3.6V,
TA = 0°C to +50°C
TA = -20°C to +70°C
-2
-3
-10
-20
15
-8
+2 %
+3
+10
mV
+20
M
+8 LSB
VOUT Output Drive
IO = 1mA
VDD - 0.5
V
VOUT Precharge Time
tPRE
13.2
13.7
14.2
ms
Temperature Error
TERR
-3 +3 °C
2 of 21


Part Number DS2786
Description Standalone OCV-Based Fuel Gauge
Maker Maxim Integrated Products
Total Page 21 Pages
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