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PDF DS2784 Data sheet ( Hoja de datos )
| Número de pieza | DS2784 | |
| Descripción | 1-Cell Stand-Alone Fuel Gauge IC | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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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
Precision Voltage, Temperature, and Current
Measurement System
Available Capacity Estimated from Coulomb
Count, Discharge Rate, Temperature, and Cell
Characteristics
Estimates Cell Aging Using Learn Cycles
Uses Low-Cost Sense Resistor
Allows for Calibration of Gain and
Temperature Coefficient
Li+ Safety Circuitry—Overvoltage,
Undervoltage, Overcurrent, Short-Circuit
Protection
Programmable Safety Thresholds for
Overvoltage and Overcurrent
Authentication Using SHA-1 Algorithm and
64-Bit Secret
32-Byte Parameter EEPROM
16-Byte User EEPROM
Dallas 1-Wire Interface with 64-Bit Unique ID
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)
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DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication
TYPICAL OPERATING CIRCUIT
PIN DESCRIPTION
PIN
1
2
3
4
5, 9, 10
6
7
8
11
12
13
14
PAD
NAME
VDD
CTG
VSS
VIN
N.C.
PLS
CC
DC
DQ
SNS
CP
PIO
PAD
FUNCTION
Power-Supply Input. Chip supply input. Bypass with 0.1µF to VSS.
Connect to Ground
Device Ground. Chip ground and battery-side sense resistor input.
Battery Voltage-Sense Input. Connect to positive cell terminal through decoupling
network.
No Connection
Pack Plus Terminal-Sense Input. Used to detect the removal of short-circuit, discharge
overcurrent, and charge overcurrent conditions.
Charge Control. Charge FET control output.
Discharge Control. Discharge FET control output.
Data Input/Output. Serial data I/O, includes weak pulldown to detect battery disconnect
and can be configured as wake input.
Sense Resistor Connection. Pack minus terminal and pack-side sense resistor sense
input.
Charge Pump Output. Bypass with 0.1µF to VSS.
Programmable I/O Pin. Can be configured as wake input.
Exposed Pad. Connect to VSS or float.
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DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication
Summary. All the protection conditions previously described are logic ANDed to affect the CC and DC outputs.
CC = (Overvoltage) AND (Undervoltage) AND (Overcurrent, Charge Direction)
AND (Protection Register Bit CE)
DC = (Undervoltage) AND (Overcurrent, Either Direction) AND (Short Circuit)
AND (Protection Register Bit DE )
PROTECTION REGISTER FORMAT
The protection register reports events detected by the Li+ safety circuit on bits 2 to 7. Bits 0 and 1 are used to
disable the charge and discharge FET gate drivers. Bits 2 to 7 are set by internal hardware only. Bits 2 and 3 are
cleared by hardware only. Bits 4 to 7 are cleared by writing the register with a 0 in the bit position of interest. Writing
a 1 to bits 4 to 7 has no effect on the register. Bits 0 and 1 are set on power-up and a transition from Sleep to
Active modes. While in Active mode, these bits can be cleared to disable the FET gate drive of either or both FETs.
Setting these bits only turns on the FETs if there are no protection faults.
BIT 7
OV
BIT 6
UV
BIT 5
COC
ADDRESS 00h
BIT 4 BIT 3
DOC
CC
BIT 2
DC
BIT 1
CE
BIT 0
DE
OV—Overvoltage Flag. OV is set to indicate that an overvoltage condition has been detected. The voltage on VIN
has persisted above the VOV threshold for tOV. OV remains set until written to a 0 or cleared by a power-on reset or
transition to Sleep mode.
UV—Undervoltage Flag. UV is a read-only mirror of the UVF flag located in the status register. UVF is set to
indicate that VIN < VUV . The UVF bit must be written to 0 to clear UV and UVF.
COC—Charge Overcurrent Flag. COC is set to indicate that an overcurrent condition has occurred during a charge.
The sense-resistor voltage has persisted above the VCOC threshold for tOC. COC remains set until written to a 0,
cleared by a power-on reset, or transition to Sleep mode.
DOC—Discharge Overcurrent Flag. DOC is set to indicate that an overcurrent condition has occurred during a
discharge. The sense-resistor voltage has persisted above the VDOC threshold for tOC. DOC remains set until written
to a 0, cleared by a power-on reset, or transition to Sleep mode.
CC—Charge Control Flag. CC indicates the logic state of the CC pin driver. CC flag is set to indicate CC high. CC
flag is cleared to indicate CC low. CC flag is read only.
DC—Discharge Control Flag. DC indicates the logic state of the DC pin driver. DC flag is set to indicate DC high.
DC flag is cleared to indicate DC low. DC flag is read only.
CE—Charge Enable Bit. CE must be set to allow the CC pin to drive the charge FET to the on state. CE acts as an
enable input to the safety circuit. If all safety conditions are met AND CE is set, the CC pin drives to VCP. If CE is
cleared, the CC pin is driven low to disable the charge FET.
DE—Discharge Enable Bit. DE must be set to allow the DC pin to drive the discharge FET to the on state. DE acts
as an enable input to the safety circuit. If all safety conditions are met AND DE is set, the DC pin drives to VCP. If
DE is cleared, the DC pin is driven low to disable the charge FET.
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| PDF Descargar | [ Datasheet DS2784.PDF ] | |
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