ZHCSD75D March 2014 – January 2018
The bq27742-G1 is a single-cell fuel gauge with integrated Li-Ion protection circuitry for highly accurate detection of overvoltage, undervoltage, overcurrent in charge, overcurrent in discharge, and short-circuit in discharge fault conditions. If the detected fault continues to be present for a specific delay time (preconfigured in the device), the protection front-end will disable the applicable charge pump circuit, resulting in opening of the FET until the provoking safety condition resolves. The integrated 16-bit delta-sigma converters provide accurate, high precision measurements for voltage, current, and temperature in order to accomplish effective battery monitoring, protection, and gauging. To allow for optimal performance in the end application, special considerations must be taken to ensure minimization of measurement error through proper printed circuit board (PCB) board layout and correct configuration of battery characteristics in the fuel gauge data flash. Such requirements are detailed in Design Requirements.