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What is the exact power-supply sequence? How long does it take?
At power-up, the part resets all the internal registers, loads half scale in the RDAC and proceeds to read the EEPROM. Once the EEPROM is correctly read back, the part loads the new RDAC value into the register. Typically the power-up sequence takes 50uS, while reset after the part is already powered up is a little faster at 30uS.