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DS90UB947-Q1: About the communication between ds90ub947 and DS90UB948

Part Number: DS90UB947-Q1

Hello TI Experts,

I am now using DS90UB948 and 948, and meet with a problem needs your help:

During the continuous read operation, firstly,948 can successfully write the register,after that ,when I do the read operation,their will be NACK

Like the picture described as below:

It is normal to read one byte at a time, but when read more than one byte continually,their will  be a NACK signal(The device supports read continually )

Can I know why?Looking forward to your help~