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UCD90160A: UCD91060A "CONTROL pin"

Part Number: UCD90160A

On the UCD91060A which pin is considered the "CONTROL pin" mentioned below in the FAQ


"The correct method to sequence off rails is to use the CONTROL pin. A delay and dependency configuration of each rail is observed, and there is no initialization time delay at the following sequence on."


Is this a PMBus reference or is it actually a physical pin or should one of the GPIs/GPIOs be configured for this.

There is *nothing* in the datasheet that shows any pin as a "control pin" or configurable control pin.