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LMH1219: I2C interface stops working at -40C

Aristo Wibawa
Prodigy 10 points
Part Number: LMH1219
Other Parts Discussed in Thread: LMH1226

Hello,

I'm using multiple LMH1219 and LMH1216 in my system. All of them stops working when the system is at -40C temperature environment. Can you please help? 

  • 0
    TI__Genius 9209 points

    Hi Aristo,

    Hope you're doing well. -40C is the lower limit of the temperature range for the LMH1219 and the LMH1226, so the devices should work. I have some follow up questions for your system to see if I can help.

    First, Do you mean LMH1226? LMH1216 is not a TI product.

    Does the temperature ever drop below -40C? If it does the operation of the parts is not guaranteed.

    Do other parts of your system operate in -40C temperature conditions? Could the failure be from another part of the system which is not guaranteed for that temperature?

    Have you tried increasing the temperature to see if that allows the devices to work?

    A suggestion is to operate the LMH devices at a temperature well within the operating temperature range so that possible fluctuations in temperature don't cause the system to fail.

    Best,

    Nick

  • 0
    Prodigy 10 points

    Hi Nick, 

    Thanks for the response.

    Yes, my apology. I meant LMH 1226. 

    From the data we've gathered, the temperature that the chips experiencing never drop below -40C. 

    All parts in my system should operate in -40C. This is what I'm currently investigating. 

    we turn on the system at +20C and let the system operate while the temperature goes down to -40C. The system soaks at -40C for 10 minutes then temperature goes back up to +20C. The system initially works OK and it fails when the temperature is at -40C. the failure disappear when the temperature goes back up to +20C. 

  • 0 in reply to Aristo Wibawa
    TI__Genius 9209 points

    Hi Aristo,

    A few more questions:

    Does the device fail right when the temperature reaches -40C or does it take a few minutes for the failure to occur?

    For the failure, does the device continue to work but you are unable to communicate with it over I2C or is it that the device turns off and fails completely?

    Any other information you could provide would be helpful as well. 

    Try to find the temperature at which the device fails. If you set the temperature to -39C is there a failure?

    Best regards,

    Nick