Fuel Gauge. DS2784 Datasheet

DS2784 Gauge. Datasheet pdf. Equivalent

Part DS2784
Description 1-Cell Stand-Alone Fuel Gauge
Feature www.DataSheet4U.com DS2784 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentica.
Manufacture Maxim Integrated Products
Datasheet
Download DS2784 Datasheet



DS2784
www.DataSheet4U.com
www.maxim-ic.com
GENERAL DESCRIPTION
The DS2784 operates from 2.5V to 4.6V for integration
in battery packs using a single lithium-ion (Li+) or Li+
polymer cell. Available capacity is reported in mAh and
as a percentage. Safe operation is ensured with the
included Li+ protection function and SHA-1-based
challenge-response authentication.
Precision measurements of voltage, temperature, and
current, along with cell characteristics and application
parameters are used to estimate capacity. The
available capacity registers report a conservative
estimate of the amount of charge that can be removed
given the current temperature and discharge rate.
In addition to the nonvolatile (NV) storage for cell
compensation and application parameters, 16 bytes of
EEPROM memory is made available for the exclusive
use of the host system and/or pack manufacturer. This
facilitates battery lot and date tracking or NV storage of
system or battery usage statistics.
A 1-Wire® interface provides serial communication at
16kbps or 143kbps to access data registers, control
registers, and user memory. Additionally, 1-Wire
communication enables challenge-response pack
authentication using SHA-1 as the hash algorithm in a
hash-based message authentication code (HMAC)
authentication protocol.
APPLICATIONS
Smartphones/PDAs
Digital Still and Video Cameras
Cordless VOIP Phones
Portable GPS Navigation
Modes and commands are capitalized for clarity.
1-Wire is a registered trademark of Dallas Semiconductor, a wholly
owned subsidiary of Maxim Integrated Products, Inc.
DS2784
1-Cell Stand-Alone Fuel Gauge IC with
Li+ Protector and SHA-1 Authentication
FEATURES
ƒ Precision Voltage, Temperature, and Current
Measurement System
ƒ Available Capacity Estimated from Coulomb
Count, Discharge Rate, Temperature, and Cell
Characteristics
ƒ Estimates Cell Aging Using Learn Cycles
ƒ Uses Low-Cost Sense Resistor
ƒ Allows for Calibration of Gain and
Temperature Coefficient
ƒ Li+ Safety Circuitry—Overvoltage,
Undervoltage, Overcurrent, Short-Circuit
Protection
ƒ Programmable Safety Thresholds for
Overvoltage and Overcurrent
ƒ Authentication Using SHA-1 Algorithm and
64-Bit Secret
ƒ 32-Byte Parameter EEPROM
ƒ 16-Byte User EEPROM
ƒ Dallas 1-Wire Interface with 64-Bit Unique ID
ƒ Tiny, Pb-Free, 14-Pin TDFN Package Embeds
Easily in Battery Packs Using Thin Prismatic
Cells
PIN CONFIGURATION
ORDERING INFORMATION
PART
DS2784G+
DS2784G+T&R
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
+ Denotes a lead-free package.
T&R = tape and reel
TOP MARK
DS2784
DS2784
PIN PACKAGE
14 TDFN (3mm x 5mm)
14 TDFN (3mm x 5mm)
1 of 37
REV: 060707



DS2784
www.DataSheet4U.com
DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication
ABSOLUTE MAXIMUM RATINGS
Voltage Range on PLS Pin Relative to VSS
Voltage Range on CP Pin Relative to VSS
Voltage Range on DC Pin Relative to VSS
Voltage Range on CC Pin Relative to VSS
Voltage Range on All Other Pins Relative to VSS
Maximum Voltage Range on VIN Pin Relative to VDD
Continuous Sink Current, PIO, DQ
Continuous Sink Current, CC, DC
Operating Temperature Range
Storage Temperature Range
Soldering Temperature (10s)
-0.3V to +18V
-0.3V to +12V
-0.3V to (CP + 0.3V)
VDD - 0.3V to CP + 0.3V
-0.3V to +6.0V
VDD + 0.3V
20mA
10mA
-40°C to +85°C
-55°C to +125°C
See IPC/JEDEC J-STD-020
*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.
ELECTRICAL CHARACTERISTICS
(VDD = 2.5V to 4.6V, TA = -20°C to +70°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP
MAX
Supply Voltage
VDD (Note 1)
IDD0 Sleep mode
2.5
1
4.6
4
IDD1
Sleep mode, VDD = 2.5V
0°C to +50°C
0.4 1.5
Supply Current
IDD2 Active mode
85 125
Temperature Accuracy
Temperature Resolution
Temperature Range
Voltage Accuracy, VIN
Voltage Resolution, VIN
Voltage Range, VIN
Input Resistance, VIN
IDD3
Active mode during SHA
computation
300 500
-3 +3
0.125
-128.000
+127.875
4.0 VIN 4.6,
VIN VDD + 0.3V
2.5 VIN 4.6V,
VIN VDD + 0.3V
-30
-50
4.88
30
+50
0 4.99
15
Current Resolution
1.56
Current Full Scale
-51.2
+51.2
Current Gain Error
-1 +1
Current Offset
Accumulated Current Offset
Time Base Error
CP Output Voltage
CP Startup Time
Output High: CC, DC
Output Low: CC
Output Low: DC
VCP
tSCP
VOHCC
VOHDC
VOLCC
VOLDC
(Notes 2, 3, 4)
(Notes 2, 3, 4)
0ºC TA +50ºC
ICC + IDC = 0.9µA
CE = 0, DE = 0,
CCP = 0.1µF, Active mode
IOH = -100µA (Note 5)
IOL = 100µA
IOL = 100µA
2 of 37
-15
-360
-2
-3
8.50
9.25
+25
0
+2
+3
10.00
200
VCP - 0.4
VDD + 0.1
0.1
UNITS
V
μA
μA
oC
mV
mV
V
MΩ
μV
mV
% full
scale
μV
μVh/day
%
V
ms
V
V
V







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