Battery Gas Gauge with IC Interface

The LTC2941 measures battery charge state in battery-supplied handheld PC and portable product applications. Its operating range is perfectly suited for single-cell Li-Ion batteries. A precision coulomb counter integrates current through a sense resistor between the battery’s positive terminal and the load or charger. The measured charge is stored in internal registers. An SMBus/I2C interface accesses and configures the device.

The LTC2941 features programmable high and low thresholds for accumulated charge. If a threshold is exceeded, the device communicates an alert using either the SMBus alert protocol or by setting a flag in the internal status register.

The LTC2941 requires only a single low value external sense resistor to set the current range.

Integrated Sense Resistor

LTC2941

No

LTC2941-1

Yes

Applications

* Low Power Handheld Products

* Cellular Phones

* MP3 Player

* Cameras

* GPS

* Indicates Accumulated Battery Charge and Discharge

* High Accuracy Analog Integration

* High Side Sense

* 1% Charge Accuracy

* ±50mV Sense Voltage Range

* SMBus/I2C Interface