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DS90UB962-Q1: DS90UB962-Q1 lights up 4CAMERA issue

Kygo Cheng
Expert 6830 points
Part Number: DS90UB962-Q1

Hi Team,

There is a good new that we could DIN DS90UB962-Q1!

Customer currently use UB962 to light up 4 megapixel cameras and there is a noise problem. Currently, the highest test can light up 3 cameras at the same time.

We also tried to increase the oscillation frequency to 26MHz. The situation has improved, but there is still noise. Currently, it is suspected that the communication frequency has reached the upper limit.

Test information

1.4 X Camera AR0147 : 4 X 1344X968 30p 16bit/12bit  >>> have noise problem

2.3 X Camera AR0147 : 3 X 1344X968 30p 16bit/12bit  >>> test OK

3.CSI_PLL_CTL 設為1.664Gbps

  • 0
    TI__Guru** 107670 points

    Can you please confirm followings:

    30 Fps and RAW16 ?

    Which Serializers are you using?

    Which clocking mode are you using? Synchronuous or Non-Synchronuous ?

  • 0 in reply to Hamzeh Jaradat
    TI__Expert 6830 points

    Hi Hamzeh Jaradat,

    Thank you!

    1.30 Fps and RAW16 ?

    We tried both RAW16 and RAW12 in 30 Fps,the results are same.

    2.Which Serializers are you using?

    953

    3.Which clocking mode are you using? Synchronuous or Non-Synchronuous ?

    Customer set as Synchronuous mode.

     

  • 0 in reply to Kygo Cheng
    TI__Guru** 107670 points

    Hello Kygo,

    the data rate you are using is relatively low and should not cause any issue.

    What I believe is happening here is you have some issues with the transmission channel impedance, such as return loss, and insertion loss, or cross talking between the channels.

    One thing you can do is to test your links one by one using our MAP-Tool. This will tell you if you have any issue in a specific channel.

  • 0 in reply to Hamzeh Jaradat
    TI__Expert 6830 points

    Hi Hamzeh Jaradat,

    Got it! I will ask the customer to using our MAP-Tool. 

    Update,

    3. Which clocking mode are you using? Synchronuous or Non-Synchronuous ?
    Found their schematic design is different with Datasheet.
    So they change the mode by modify 953 register 0x03.

    0x10: CSI-2 Synchronous Mode, Result:3 input is ok, 4input is no screen
    0x12: CSI-2 Non-synchronous external clock Mode, Result: no screen
    0x13: CSI-2 Non-synchronous Internal AON Clock, Result: no screen

  • 0 in reply to Kygo Cheng
    TI__Guru** 107670 points

    Hello Kygo,

    thanks for the feedback. and waiting for the next update!

  • 0 in reply to Hamzeh Jaradat
    TI__Expert 6830 points

    Hi Hamzeh Jaradat,

    You mentioned before
    "The data rate you are using is relatively low and should not cause any issue."
    Could you please provide some relevant data? For example, what is the upper limit that 962 can bear? THX

  • 0 in reply to Kygo Cheng
    TI__Guru** 107670 points

    Hello Kygo,

    this is mentioned on the first page of the datasheet!

    * The UB962 is a Quad 3-Gbps Deserializer Hub Aggregates Data From up to 4 Sensors Simultaneously
    * Supports 1-Megapixel Sensors With HD 720p/800p/960p/1MP Resolution at 30-Hz or 60-Hz Frame Rate
    * MIPI DPHY Version 1.2 / CSI-2 Version 1.3 Compliant
    – 1 × CSI-2 MIPI Output Port
    – Supports 1, 2, 3, 4 Data Lanes
    – CSI-2 Data Rate Scalable for 400 Mbps / 800 Mbps / 1.2 Gbps / 1.5 Gbps / 1.6 Gbps per Data Lane