Features: `Available in Two Configurations
- Internal 25m Sense Resistor
- External User-Selectable Sense Resistor
`Current Measurement
- 12-Bit Bidirectional Measurement
- Internal Sense Resistor Configuration:
0.625mA LSB and ±1.9A Dynamic Range
- External Sense Resistor Configuration:
15.625V LSB and ±64mV Dynamic Range
`Current Accumulation
- Internal Sense Resistor: 0.25mAhr LSB
- External Sense Resistor: 6.25Vhr LSB
`Voltage Measurement with 4.88mV Resolution
`Temperature Measurement Using Integrated
Sensor with 0.125 Resolution
`32 Bytes of Lockable EEPROM
`16 Bytes of General-Purpose SRAM
`Dallas 1-Wire® Interface with Unique 64-Bit Device Address
`Supports 1-Cell Li+/Polymer or 3-Cell Ni Battery Packs
`3mm Dimension of 8-Pin TSSOP Package
Allows Mounting on Side of Thin Li+ and
Li+/Polymer Cells (Lead Free available)
`Low Power Consumption:
- Active Current: 60A (typ), 90A (max)
- Sleep Current: 1A (typ), 2A (max)Pinout
SpecificationsVoltage on PIO Pin, Relative to VSS................ -0.3V to +12V
Voltage on All Other Pins, Relative to VSS ............. -0.3V to +6V
Continuous Internal Sense Resistor Current ...............±2.5A
Pulsed Internal Sense Resistor Current ...±50A for <100s/s, <1000 Pulses
Operating Temperature Range ..................-40 to +85
Storage Temperature Range .................. -55 to +125
Soldering Temperature .............. See J-STD-020A Specification
* 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.
DescriptionThe DS2751 multichemistry battery fuel gauge is a data-acquisition and information-storage device tailored for cost-sensitive and space-constrained 1-cell Li+/polymer or 3-cell Ni battery-pack applications. The DS2751 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 DS2751 gives the host system read/write access to status and control registers, instrumentation registers, and general-purpose data storage. Each device has a unique factoryprogrammed 64-bit net address that allows it to be individually addressed by the host system, supporting multibattery operation.
The DS2751 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 and accumulation are accomplished using either an internal 25m sense resistor or an external device. The DS2751 also features a programmable I/O pin that allows the host system to sense and control other electronics in the pack, including switches, vibration motors, speakers, and LEDs.
Three types of memory are provided on the DS2751 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.
DS2751 Data Sheet
