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DS90UB948-Q1: Interface forum

Chris Park
Prodigy 345 points

Part Number: DS90UB948-Q1

Hi, this is Chris Park from TI Korea and I have a few questions related to FPD Link3(DS90UB948-Q1). I believe that from FPD Link3, while receiving display signal, it can send/receive I2C data through back. channel.

My customer is developing a FHD display device using FPD Link3.

If DS90UB948-Q1 is the I2C master and DS90Ux947-Q1EVM is used as the slave in the communication, 

1. Does the customer need additional H/W in their system?

2. What are the values of Register settings?

    A. The value of Slave address sending from MCU to DS90UB948-Q1

    B. The value of Slave address sending from DS90UB948-Q1 to DS90Ux947-Q1

   C. What values to set in which Register

   D. Sample Source or those Register settings mentioned above.

3.  When designed as below picture, could you please share sample source or register settings for DS90UB948-Q1?

Thank you for your support.

  • 0
    TI__Guru 66900 points

    Hi Chris, 

    Chris Park said:
    1. Does the customer need additional H/W in their system?

    I2C master at 948 DES side of the 947 to 948 link is possible.

    Chris Park said:
    What are the values of Register settings?

    For 948:

    Register Field Value Description
    REMOTE_ID (0x07) REMOTE_ID [bits 7-1] Auto populated upon 947 lock Serializer Address
    I2C_PASS_THROUGH_ALL (0x05) I2C_PASS_THROUGH_ALL [bit 7] 1 Allows SER communication without DES aliasing

    You didn't specify if you need to communicate to a remote slave on SER side, or only to the SER itself. Additional setup will be needed to talk to a slave (as shown below - ignoring specific part#/registers - DES/SER are reverse)

    This app note is also applicable to 94x I2C BCC communication. 

    Regards, 

    Logan

  • 0 in reply to Logan Cummins
    TI__Prodigy 345 points

    Thanks for the support. 

    Could you please elaborate on " I2C master at 948 DES side of the 947 to 948 link is possible."? I do not understand your point.

  • 0 in reply to Chris Park
    TI__Guru 66900 points

    Hi Chris, 

    I was only saying that 948 DES can have an I2C master without any additional H/W. 

    Regards, 

    Logan