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DS90UB921-Q1: DS90UB921 SCL activity

Part Number: DS90UB921-Q1


I'd like to know all condition for SCL is keeping Low with no ACK for DS90UB921.

I'm seeing this behavior on SCL of DS90UB921.

Please let me know.



  • Hello,

    Can you please specify? Is it held low for how long? and after what command?

    Is this seen on the 921 I2C local bus? 

    Which other devices do you have connected into the same bus?

    Are you using the same I2C speed for all devices connected to this bus?

    Are you communicating remotely or locally at the time it goes low?