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SN65DSI83-Q1: SN65DSI83 Radiated Emission

Fons van Heese1
Prodigy 30 points

Part Number: SN65DSI83-Q1
Other Parts Discussed in Thread: SN65DSI83

Hello,

In our appliance we use a SoM. For LVDS generation the TI SN65DSI83 is uses. It seems to be working fine, images and video's are visible on a 1280 x 800 display.
At a EMC pre-assessment we noticed fails at several LVDS clock harmonics. RE LVDS.PNG

Today we measured to the LVDS CLK output. We connected a 100 ohm resistor between the P an N pin of the differentieal LVDS signal.

20260210 Differential Output to High.png

We see a differential voltage of about 650 mV.

650 mV is impossible following the datasheet of SN65DSI83

DS OD tablke.PNG

We are not yet 100% sure about all actual bridge settings, we are wrking on this.

Anybody any idea what is going wrong here?

 

  • 0
    TI__Mastermind 30050 points

    Hi Fons,

    Is the system measured with the same settings as during operation with the display working? Please check whether there is 100-Ohm differential termination in the display, and if there is no internal termination, then the 100-Ohm differential resistors should be added.

    Also, are you changing the settings on register 0x19? You could use that register to lower the voltage swing and check if that resolves the issue.

    Best regards,
    Ikram