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TMP422: SDA/SCL pins behavior when powered down

Part Number: TMP422

It the TMP422 is not powered, but an external I2C master is using the I2C bus connected to the TMP422 (3.3V operation) how will the TMP422 react? Will it leak current to its own supply through ESD diodes? Will it act nicely and just present a high impedance to the bus until it is powered?