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Dallas Semiconductor

DS2755 Datasheet Preview

DS2755 Datasheet

High-Accuracy Battery Fuel Gauge

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www.maxim-ic.com
DS2755
High-Accuracy Battery
Fuel Gauge with Snapshot
FEATURES
ƒ Snapshot Mode Allows Instantaneous Power
Measurement
ƒ Accurate Current Measurement for Coulomb
Counting (Current Accumulation)
- 2% ±4μV over ±64mV Input Range
- 2% ±200μA over ±3.2A Range Using a 20mΩ
Sense Resistor
ƒ Current Measurement
- 9-Bit Bidirectional Snapshot Measurement
- 12-Bit Bidirectional Average Updated Every
88ms
- 15-Bit Bidirectional Average Updated Every 2.8s
ƒ Voltage Measurement
- 9-Bit Snapshot Measurement
- 10-Bit Measurement Updated Every 4ms
ƒ Temperature Measurement
- 10-Bit Measurement, 0.125°C Resolution Using
Integrated Sensor
ƒ Host Alerted When Accumulated Current or
Temperature Exceeds User-Selectable Limits
ƒ 96 Bytes of Lockable EEPROM
ƒ 8 Bytes of General-Purpose SRAM
ƒ Dallas 1-Wire® Interface with Unique 64-Bit
Device Address with Standard 16kbps or
Overdrive 142kbps Timing
ƒ 3mm Dimension of 8-Pin TSSOP Package Allows
Mounting on Side of Thin Prismatic Li+ and
Li+/Polymer Cells
APPLICATIONS
Cell Phones
Digital Cameras
Smartphones
PDAs
Portable Consumer Products
PIN CONFIGURATION
VIN 1
VSS 22
PIO 3
VDD 42
8 DQ
7 SNS
6 IS2
5 IS1
DS2755E
8-Pin TSSOP Package
DESCRIPTION
The DS2755 high-precision battery fuel gauge is a
data-acquisition and information-storage device
tailored for cost-sensitive and space-constrained 1-
cell Li+/polymer battery-pack applications. The
DS2755 provides the key hardware components
required to accurately estimate remaining capacity by
integrating low-power, precision measurements of
temperature, voltage, current, and current
accumulation, as well as nonvolatile (NV) data
storage, into the small footprint of a 3.0mm x 4.4mm
8-pin TSSOP package.
Through its 1-Wire interface, the DS2755 gives the
host system read/write access to status and control
registers, instrumentation registers, and general-
purpose data storage. Each device has a unique
factory-programmed 64-bit net address that allows it
to be individually addressed by the host system,
supporting multibattery operation.
ORDERING INFORMATION
PART
DS2755E+
DS2755E+T&R
MARKING
2755
2755
TEMP RANGE
-20°C to +70°C
-20°C to +70°C
1-Wire is a registered trademark of Dallas Semiconductor.
DESCRIPTION
8-Pin TSSOP, Lead Free
DS2755E+ on Tape-and-Reel
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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020507




Dallas Semiconductor

DS2755 Datasheet Preview

DS2755 Datasheet

High-Accuracy Battery Fuel Gauge

No Preview Available !

DS2755: High-Accuracy Battery Fuel Gauge with Snapshot
DESCRIPTION (CONTINUED)
The DS2755 performs temperature, voltage, and current measurement to a resolution sufficient to support process-
monitoring applications such as battery charge control and remaining capacity estimation. Temperature is
measured using an on-chip sensor, eliminating the need for a separate thermistor. Bidirectional current
measurement supporting current accumulation (coulomb counting) is accomplished using an external current
sense resistor.
The host system can configure the DS2755 to signal critical conditions to reduce polling overhead. The interrupt
fires when programmable upper and lower thresholds of temperature or coulomb count are crossed. The user can
select either the DQ pin or PIO pin as the interrupt signal.
The programmable I/O pin allows the host system to sense and control other electronics in the pack, including
switches, vibration motors, speakers, and LEDs, or the I/O pin can be configured as an interrupt output.
Three types of memory are provided on the DS2755 for battery information storage: EEPROM, lockable EEPROM,
and SRAM. EEPROM memory saves important battery data in true NV memory that is unaffected by severe battery
depletion, accidental shorts, or ESD events. Lockable EEPROM becomes ROM when locked to provide additional
security for unchanging battery data. SRAM provides inexpensive storage for temporary data.
Figure 1. APPLICATION EXAMPLE
PACK+
500 1k
1 Cell Li+
5.6V
(1)
Protection IC
(Li+/Polymer)
VIN
VSS
PIO
VDD
DQ
SNS
IS2
IS1
DS2755
103
104
5.6V 5.6V
(1) (1)
150 PIO
150 DATA
102
RSNS PACK -
2.5V
(1)
(1) Optional component(s) for robust ESD performance
SNS
RKS
IS2
ADC
Input
DS2755
VSS
RKS
IS1
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Part Number DS2755
Description High-Accuracy Battery Fuel Gauge
Maker Dallas Semiconductor
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DS2755 Datasheet PDF






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