Battery Gas Gauge with I2C Interface
nn Indicates Accumulated Battery Charge
nn High Accuracy Analog Integration
nn High Side Sense
nn 1% Charge Accuracy
nn ±50mV Sense Voltage Range
nn SMBus/I2C Interface
nn Configurable Alert Output/Charge Complete Input
nn 2.7V to 5.5V Operating Range
nn Quiescent Current Less Than 100µA
nn Small 6-Pin 2mm × 3mm DFN and 8-Lead
nn Low Power Handheld Products
nn Cellular Phones
nn MP3 Player
The LTC®2941 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 inter-
nal status register.
The LTC2941 requires only a single low value external
sense resistor to set the current range.
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Total Charge Error vs
Differential Sense Voltage
VSENSE+ = 3.6V
For more information www.analog.com