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DS90UB948-Q1: Default value after digital reset?

Lee, Sam
Expert 6035 points
Part Number: DS90UB948-Q1

Hi team,

 

Could you please check the default register value issue after digital reset in DS90UB948-Q1?

 

Sequence:

1. Reset -> Register 0x01 = 0x02

2. Readback -> Register 0x1D (GPIO0) = 0x10 -> It should be 0x03 (default value in datasheet)

3. Readback -> Register 0x1E (GPIO1) = 0x00 -> It should be 0x03 (default value in datasheet)

 

FYI. GPIO0 is connected from MCU. GPIO1 is not connected.

 

Thanks,

Sam Lee

 

  • 0
    TI__Guru** 103215 points

    Hello Sam,

    The default value depends on if you have PORT1_SEL selected or not. If you have PORT1_SEL = 1, then the datasheet defaults apply. If you have PORT1_SEL = 0, then the values you posted apply. 

    Best Regards,

    Casey 

  • 0 in reply to Casey McCrea
    TI__Expert 6035 points

    Hi Casey,

    Thank you for your answer. Since there is no description in datahseet, is it possiible to update the datasheet? Otherwise, I need to deliver a message to customer.

    So, the default value is as follows. Is it correct?

    PORT1_SEL = 0 (GPIOx)

       : 0x1D(GPIO0) = 0x10

       : 0x1E(GPIO1) = 0x00

    PORT1_SEL = 1 (D_GPIOx)

       : 0x1D(GPIO0) = 0x03

       : 0x1E(GPIO1) = 0x03

    Thanks,

    Best Regards,

    Sam Lee

  • 0 in reply to Lee, Sam
    TI__Guru** 103215 points

    Hello Sam,

    Please convey the message to the customer and your statements are correct. We can consider making this more clear in the next datasheet update 

    Best Regards,

    Casey