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TMS320F28379D: Maximum Ambient Pressure

Art Mecina
Genius 16795 points

Part Number: TMS320F28379D
Other Parts Discussed in Thread: TIDA-01606,

Hi Guys,

Our customer is looking to incorporate the TIDA-01606 in their design. The design will be in an enclosure submerge in the ocean, near the surface only. 

They wanted to know the maximum ambient pressure the device TMS320F28379D can handle? 

Also, will noise affect device performance when submerged under the ocean?

Cordially,

Art

  • 0
    TI__Guru* 95315 points

    Art,

              I have reached out to a Quality/Reliability expert for an answer to your question about pressure. 

    About your question on “noise”, you need to define that term better. Noise can be from external sources and also self-generated. Submerged under the ocean, it may be impacted less by ambient noise compared to a system operating in a populated area with its concomitant noise sources. However, the system may still be vulnerable to self-generated noise. For example, a switching power-supply may be used to power the MCU and it may be impacted by noise (both conducted and radiated) generated by the power-supply. So, your question is hard to answer without a thorough knowledge of the operating conditions of your system.

  • 0 in reply to Hareesh Janakiraman
    TI__Genius 16795 points

    Thanks a lot Hareesh! 

    I'll ask for a clarification from the customer regarding Noise.

    If there is a need to take this offline, just let me know and I can send you a private message.

    Cordially,

    Art

  • 0 in reply to Art Mecina
    TI__Guru* 95315 points
    Art Mecina said:
    They wanted to know the maximum ambient pressure the device TMS320F28379D can handle? 

    I enquired and was told this is not a parameter that we specify.

    Regarding noise, the system should still be designed with best-practices in terms of power-supply decoupling, PCB layout and component placement. 

    You are welcome to reach out to me offline.

  • 0 in reply to Hareesh Janakiraman
    TI__Genius 16795 points

    Hi Hareesh,

    Noted on the maximum ambient pressure. 

    About the noise, according to the customer, the noise is going to come from the external sources. Although some will be self generate from the workings of the MOSFETs, in this case that can be omitted as it is not very significant compared to the external noise. Since I will test them in a worst case scenario, the operating conditions will be at an average intensity of noise next to all the ships to be about 200 decibels, which is almost equivalent to 120 decibels through the air.

    Will the device be able to handle this kind of noise? Is there any documents they can follow for best practices?

    Best regards,

    Art

  • 0 in reply to Art Mecina
    TI__Guru* 95315 points

    All devices are designed with best practices in mind that enable them to operate in noisy conditions. Having said that, any device could be impacted when noise exceeds a certain threshold. The challenge lies in determining precisely how the disturbance impacts the circuit. i.e. in identifying exactly how noise couples into the circuit. In other words, what is the conduit for this noise to get into the circuit and cause the malfunction? Once this is identified, it is relatively easy to come up with the protection solution. Unfortunately, often times, the shortcomings are discovered after the board is made and hence make the redesign of the board necessary. 

    Many books have been written on this topic and many papers published. The actual circuit design, the components used, the geometry of the components, the board layout, the board stack-up, the shielding employed , all play a role in the immunity strength of the design. There are numerous resources online that deal with this. Hard to explain them in a post. Please google "EMC shielding" for helpful links. 

    A chattering relay is helpful in generating noise across a wide spectrum. It is an extremely simple circuit. Since it is not electrically connected to the circuit, it provides a simple way to ascertain if the circuit is affected by radiated noise.