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Wide-Vin Battery Charger Using SMBus Communication Interface Between MSP430 MCUs and bq Fuel Gauges

Authored on: Mar 22, 2011 by Abhishek A. Joshi, Keith J. Keller

Technical Paper / Application Report

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This application report describes a smart-battery charger reference design with a wide-input-voltage range. The reference design implements the System Management Bus (SMBus) protocol for communication between the MSP430 microcontroller and a SMBus-compatible battery fuel gauge. The MSP430 device interrogates the fuel gauge for voltage, current, and other parameters via SMBus. It then adjusts the pulse width modulation (PWM) duty-cycle output signals being fed to the DC/DC converter to deliver the power requested by the battery.
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