Rainbow Electronics DS2756 - Manual

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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 .
GENERAL DESCRIPTION
The DS2756 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
DS2756 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
Ò interface, the DS2756 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.
TYPICAL OPERATING CIRCUIT
Protector
DS2756
DQ
PIO VIN
VDD
SNS
IS2 IS1
VSS
PACK+
INT
PACK-
150
150
1K 150
0.020
0.1µF 0.1µF
5.1V 5.1V 5.1V
DATA
FEATURES
§ Programmable Suspend Mode
§ Accurate Current Accumulation
- 2% ±4 mV over ±64mV Input Range
- 2% ±200 mA over ±3.2A with 20mW Sense
§ Current Measurement
- 9-Bit Snapshot Measurement
- 12-Bit Average Updated Every 88ms
- 15-Bit Average Updated Every 2.8s
§ Voltage Measurement
- 9-Bit Snapshot Measurement
- 10-Bit Average Updated Every 4ms
§ Temperature Measurement
- 10-Bit with 0.125 °C Resolution
§ Snapshot mode allows instantaneous power
measurement
§ Host Alerted When Accumulated Current or
Temperature Exceeds Programmable Limits
§ 96 Bytes of Lockable EEPROM
§ 8 Bytes of General-Purpose SRAM
§ Dallas 1-Wire Interface with Unique 64-Bit
Address and Standard or Overdrive Timing
§ 3mm Dimension of 8-Pin TSSOP Package
Allows Mounting on Side of Thin Prismatic
Li+ and Li+/Polymer Cells
ORDERING INFORMATION
PART TEMP RANGE PIN-PACKAGE
DS2756E+ -20°C to +70°C 8 TSSOP
DS2756E+T&R -20°C to +70°C
DS2756E+ on
Tape-and-Reel
+ Denotes lead-free package.
PIN CONFIGURATION
V
IN
DQ
SNS
IS2
PIO
1
2
2
1 8
7
6
5 V
SS
2
3
V
DD 4 IS1
DS2756E
TSSOP Package
DS2756
High-Accuracy Battery Fuel Gauge
with Programmable Suspend Mode
www.maxim-ic.com
1-Wire is a registered trademark of Dallas Semiconductor.