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LTC2942-1 - 1A Battery Gas Gauge with Internal Sense Resistor and Temperature/Voltage Measurement

The LTC2942-1 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 ΔΣ ADC. The three measured quantities (charge, voltage and temperature) are stored in internal registers accessible via the onboard SMBus/I2C interface.

The LTC2942-1 features programmable high and low thresholds for all three measured quantities. If a programmed threshold is exceeded, the device communicates an alert using either the SMBus alert protocol or by setting a flag in the internal status register.

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 Typical Application

Applications Low Power Handheld Products Cellular Phones MP3 Players Cameras GPS Packaging

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