The LTC2941IDCB-1 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 LTC2941IDCB-1 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 LTC2941IDCB-1 requires only a single low value external sense resistor to set the current range.
Integrated Sense ResistorLTC2941NoLTC2941-1YesFeature
- Indicates Accumulated Battery Charge and Discharge
- High Accuracy Analog Integration
- High Side Sense
- 1% Charge Accuracy
- ±50mV Sense Voltage Range
- SMBus/I2C Interface
- Configurable Alert Output/Charge Complete Input
- 2.7V to 5.5V Operating Range
- Quiescent Current Less Than 100µA
- Small 6-Pin 2mm × 3mm DFN and 8-Lead MSOP Packages
Applications
- Low Power Handheld Products
- Cellular Phones
- MP3 Player
- Cameras
- GPS
