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Original question:

SN65DP159: SMARC module and DDC signals

SN65DP159: SMARC module and DDC signals

Lorenzo Veltroni
Prodigy 110 points
Part Number: SN65DP159

Hello,

Could you confirm if when SDA/SCL from the source is connected directly to the SDA/SCL sink then SCL_SRC and SDA_SRC pins must be pulled to ground or to VCC?

In addition I would ask if SDA_SNK and SCL_SNK can work properly at 3.3Vdc (level shifter with pull up to 3.3Vdc instead of 5V)

Thanks

Lorenzo

  • 0
    TI__Guru**** 178516 points

    Lorenzo

    SCL_SRC and SDA_SRC need to be pulled to GND. We have seen cases where noise in the system on the unconnected pins has been interrupted as signaling by the DP159 and has resulted in the DP159 holding the I2C bus indefinitely.

    SDA_SNK and SCL_SNK can work at 5V, not 3.3V.

    Thanks

    David