High-Accuracy Battery Fuel Gauge with Programmable Suspend Mode

The DS2756 remains in production, however, for new projects, we recommend ModelGauge m5 MAX17201 fuel gauge.

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® 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.

* Programmable Suspend Mode

* Accurate Current Accumulation

* 2% ±4µV over ±64mV Input Range

* 2% ±200µA over ±3.2A with 20mΩ 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