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PDF DS2756 Data sheet ( Hoja de datos )
| Número de pieza | DS2756 | |
| Descripción | High-Accuracy Battery Fuel Gauge | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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www.maxim-ic.com
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-WireÒ 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.
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TYPICAL OPERATING CIRCUIT
PACK+
INT
DATA
150
150
PACK-
5.1V 5.1V
DS2756
PIO VIN
DQ VDD
SNS VSS
IS2 IS1
0.1µF
0.020
1K 150
0.1µF
Protector
5.1V
1-Wire is a registered trademark of Dallas Semiconductor.
DS2756
High-Accuracy Battery Fuel Gauge
with Programmable Suspend Mode
FEATURES
§ Programmable Suspend Mode
§ Accurate Current Accumulation
- 2% ±4mV over ±64mV Input Range
- 2% ±200mA 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
DS2756E+
TEMP RANGE
-20°C to +70°C
DS2756E+T&R -20°C to +70°C
+ Denotes lead-free package.
PIN-PACKAGE
8 TSSOP
DS2756E+ on
Tape-and-Reel
PIN CONFIGURATION
VIN 11
VSS
PIO
22
3
VDD 24
8 DQ
7 SNS
6 IS2
5 IS1
DS2756E
TSSOP Package
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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050806
1 page  
DS2756: High-Accuracy Battery Fuel Gauge with Programmable Suspend Mode
Figure 2. Functional Diagram
DQ
THERMAL
SENSE
VIN
IS2
1-WIRE
INTERFACE
AND
ROM ID
VOLTAGE
REFERENCE
M
U ADC
X
-+
S
LOCKABLE EEPROM
BLOCKS
SRAM
TEMPERATURE
VOLTAGE
CURRENT
ACCUM. CURRENT
COMPARATORS
STATUS / CONTROL
BIAS
VDD
PRECISION
TIMEBASE
Low Power
Oscillator
PIO
IS1
10KW
10KW
SNS
chip ground
VSS
DETAILED PIN DESCRIPTION
Pin Name Description
1
VIN
Battery Voltage-Sense Input. Voltage measurement performed on VIN input and displayed
in Voltage Register.
2
VSS
Device Ground and Current-Sense Resistor Connection. VSS attaches to battery end of
sense resistor.
3 PIO General-Purpose Programmable I/O Pin or Optional Interrupt Output
4 VDD Input Supply: +3.0V to +5.5V Input Range. Bypass VDD to VSS with 0.1mF.
5 IS1 Current-Sense Filter Input 1
6 IS2 Current-Sense Filter Input 2
7 SNS Sense Resistor Connection. SNS attaches to pack end of current sense resistor.
8
DQ
Serial Interface Data I/O Pin. Bidirection data transmit and receive at 16kbps or 143kbps.
Optional interrupt output.
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5 Page 
DS2756: High-Accuracy Battery Fuel Gauge with Programmable Suspend Mode
Table 1. PIO/DQ Pin Function
REGISTER BIT SETTING
PIO/DQ PIN FUNCTION
PIE IOS IE PIO
xx x x 0 PIO pin: GPIO¾Output LOW
00 x 0 1 PIO pin: GPIO¾Output High-Z, Input mode
00 0
1
00 1
1
00 1
01
10 x
11
x¾Don’t care.
1
x
1 PIO pin: Alarm Comparator Interrupt Output
0
DQ pin: Alarm Comparator Interrupt Output (low for tIL)
PIO pin: GPIO¾Output LOW
1
DQ pin: Alarm Comparator Interrupt Output (low for tIL)
PIO pin: GPIO¾Output High-Z, Input mode
1 PIO pin: Suspend Interrupt Output
SUSPEND THRESHOLDS
The suspend thresholds set the current level to enter and exit Suspend mode. The threshold levels are
programmable with a magnitude range of 0 to 4mV, and are compared against the value in the Current register.
Values are programmed in two’s complement format with an implied sign bit in a virtual 9th bit position. The Charge
Suspend Threshold register is always a positive value. The Discharge Suspend Threshold register is always a
negative value.
The thresholds define an inclusive, continuous range of currents in which the DS2756 enters or re-enters Suspend
mode from Active mode. The Charge Suspend Threshold represents the minimum measured charge current which
will cause the DS2756 to transition modes. The Discharge Suspend Threshold represents the minimum discharge
current which will cause the DS2756 to transition modes.
The user values of the suspend thresholds are programmed into two bytes located within EEPROM block 0. These
memory locations serve as current threshold values only when either PIE bit is set, and can be used as general
purpose EEPROM if PIE = 00b. A copy command is required to save the byte values to EEPROM. See the
Memory section for information on copying shadow RAM to EEPROM.
Figure 9. Charge Suspend Threshold Format
Address 35h
27 26 25 24 23 22 21 20
MSb
LSb
15.625mV/RSNS
Figure 10. Discharge Suspend Threshold Format
Address 34h
27 26
MSb
25 24 23 22 21 20
LSb
15.625mV/RSNS
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| PDF Descargar | [ Datasheet DS2756.PDF ] | |
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