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DS90UB953-Q1: DS90UB953-Q1 no output in low temperature condition

Eddie Chou
Expert 6170 points
Part Number: DS90UB953-Q1
Other Parts Discussed in Thread: DS90UB954-Q1

Hi Team,

My customer happened issue with DS90UB953-Q1 no output at low temperature condition. (30% failure @ -20 °C)

Customer checked there is no clock output from DS90UB953-Q1, I2C is not acknowledged and customer also checked  DS90UB954-Q1 is not lock.

DS90UB953-Q1 will become normal if ambient temperature back to  ~0°C. 

Customer check DS90UB953-Q1 datasheet can support -40 °C, they would like to know what is our suggest about this issue.

thanks & Regards

Eddie

  • 0
    TI__Intellectual 1025 points

    Hi Eddie,

    There are a few things you could try.

    First, probe the power supply during the tests to make sure that the supply voltages stay within the required range for the device.

    Also, check the operating temperatures of the components of your PLC circuit for the power supply, especially for the capacitors, to make sure they operate at -20C.

    You can also run the test again, but once communication is reestablished, check the T_SENSOR_LOW bit in the SENSOR_STATUS register to see if the temperature sensors on the device indicate levels below the threshold.

    Also, try probing the local I2C channels on the serializer if you have only been checking the forward/back channel I2C so far.

    Thanks,

    Carrie 

  • 0 in reply to Carrie Kemmet
    TI__Expert 6170 points

    Hi Carrie,

    Below feedback from customer,

    First, probe the power supply during the tests to make sure that the supply voltages stay within the required range for the device.

    Checked, within the required range

    Also, check the operating temperatures of the components of your PLC circuit for the power supply, especially for the capacitors, to make sure they operate at -20C.

    Checked, within the spec.

    You can also run the test again, but once communication is reestablished, check the T_SENSOR_LOW bit in the SENSOR_STATUS register to see if the temperature sensors on the device indicate levels below the threshold.

    Will update.

    Also, try probing the local I2C channels on the serializer if you have only been checking the forward/back channel I2C so far.

    They also checked.  

     

    Customer would like we help review PCB layout, I will send by e-mail. would you help to check if any issue might cause this issue?

     

    Thanks & Regards

    Eddie

  • 0 in reply to Eddie Chou
    TI__Intellectual 1025 points

    Hi Eddie,

    I received your email with the PCB layout enclosed. I'll review it and respond with my comments by tomorrow afternoon.

    Thank you,

    Carrie

  • 0 in reply to Carrie Kemmet
    TI__Intellectual 1025 points

    Hi Eddie,

    Your PCB layout looks good.  What connector are you using for DOUT?

    Can you supply more information about your tests and their results? I’d like to know whether you start in low temperature or gradually decrease, whether both serializer and deserializer are subject to the temperature or just the serializer, how many samples and devices you are using for your results, etc.

    Thanks,

    Carrie