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LTC2943 - Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement

The LTC®2943 measures battery charge state, battery voltage, battery current and its own temperature in portable product applications. The wide input voltage range allows use with multicell batteries up to 20V. A precision coulomb counter integrates current through a sense resistor between the battery’s positive terminal and the load or charger. Voltage, current and temperature are measured with an internal 14-bit No Latency ΔΣ™ ADC. The measurements are stored in internal registers accessible via the onboard I2C/SMBus Interface.

The LTC2943 features programmable high and low thresholds for all four 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. The LTC2943 requires only a single low value sense resistor to set the measured current range.

Features Measures Accumulated Battery Charge and Discharge 3.6V to 20V Operating Range for Multiple Cells Application 14-Bit ADC Measures Voltage, Current and Temperature 1% Voltage, Current and Charge Accuracy ±50mV Sense Voltage Range High Side Sense General Purpose Measurements for Any Battery Chemistry and Capacity I2C/SMBus Interface Configurable Alert Output/Charge Complete Input Quiescent Current Less Than 120μA Small 8-Lead 3mm × 3mm DFN Package Typical Application

Applications Power Tools Electric Bicycles Portable Medical Equipment Video Cameras Packaging

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