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DS90UB928Q-Q1: Periodic strange I2C command output?

Part Number: DS90UB928Q-Q1

Hello,

A customer is seeing a series of strange I2C commands on the bus when DS90UB928 is running stand alone with internal pattern generator active on internal oscillator. There is no serializer connected.

The command is 0x32h ending with NACK, appears in random timing.

Can DS90UB928 output I2C command spontaneously, even though no serialiser is connected? It does not seem likely though.

Thank you.

Regards,

Oguri (TIJ automotive FAE)