DESCRIPTION
The LTC®2942-1 measures battery charge state, battery voltage and chip temperature in 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 an internal sense resistor between the battery’s positive terminal and the load or charger. Battery voltage and on-chip temperature are measured with an internal 14-bit No Latency ∆Σ™ ADC. The three measured quantities (charge, voltage and temperature) are stored in internal registers accessible via the onboard SMBus/I2C interface.

FEATUREs
■ Indicates Accumulated Battery Charge and Discharge
■ SMBus/I2C Interface
■ Integrated 50mΩ High Side Sense Resistor
■ ±1A Sense Current Range
■ High Accuracy Analog Integration
■ ADC Measures Battery Voltage and Temperature
■ Integrated Temperature Sensor
■ 1% Voltage and Charge Accuracy
■ Configurable Alert Output/Charge Complete Input
■ 2.7V to 5.5V Operating Range
■ Quiescent Current Less than 100µA
■ Small 6-Pin 2mm × 3mm DFN package

APPLICATIONS
■ Low Power Handheld Products
■ Cellular Phones
■ MP3 Players
■ Cameras
■ GPS