Changes between Version 28 and Version 29 of faq


Ignore:
Timestamp:
02/13/2019 06:15:52 PM (4 years ago)
Author:
Ryan Erbstoesser
Comment:

move thermal info to thermal page and link

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  • faq

    v28 v29  
    138138== Why are certain areas on the board warm with regards to temperature? Why is my board hot? ==
    139139
    140 Heat is related to power. The more power the board draws, the more heat that must be dissipated.
    141 
    142 The number one item that will be warm is the CPU. CPUs from Gateworks should all be equipped with a heatsink and depending on the CPU speed a fansink may be required.
    143 
    144 Gateworks boards use components that are rated from -40 to +85C and higher (for example most CPU's and powersupply components have higher temp ratings). Note the +85C is the max rating for the component temperature which specifies the max temperature the component is guaranteed to work. The max ambient temperature for the overall product will be lower and is dependent on the effectiveness of the cooling solution used (enclosure, airflow, heatsinks, etc...).   
    145 
    146 The second item that will be warm will be any wireless radios that may be used. These typically consume a lot of power and thus will become warm.
    147 
    148 Another item that is warm may be the PCIe switch (used on certain boards). The typical power usage
    149 is appx 1.35W up to a max of appx 2.6W (max being 85% traffic). The switch does support PCIExpress Active State Power Management (ASPM)and also will power down unused !SerDes lanes automatically to reduce power when possible. Some customers choose to place a heatsink on the PLX PCIe switch chip.
    150 
    151 A successful technique has been to heatsink the processor to an exterior metal enclosure which essentially makes the entire enclosure a heatsink with lots of surface area for dissipation. This can also be done with wireless radios.
    152 
    153 To summarize:
    154  * Heat is a direct relationship with power consumption
    155  * Heatsink the CPU to a metal enclosure for better heat dissipation and/or use airflow
    156  * Add a heatsink to the PCIe switch chip if desired
    157  * Add a fan to dissipate the heat and avoid hotspots - use a fan to blow air over the board and radios to help cool them. This can be very effective even in a sealed outdoor enclosure. Gateworks sells an outdoor enclosure in which there is a small fan which circulates the air inside to help even out any hot spots on the CPU and radios. This fan alone typically lowers the CPU temp by around 15C. [http://shop.gateworks.com/index.php?route=product/category&path=76_78 Outdoor Enclosure]
    158  * It is possible to couple the radios to the enclosure. For doing this thermal pad material can be used. The thermal pad is applied to the top of the radio and the board is mounted so this pad then makes contact with the side of the enclosure. The pads are available in a variety of thicknesses which allows you to optimize it for your enclosure mounting. Here is a link for an example of the type of thermal pad that customers often use:
    159   * [http://www.digikey.com/product-detail/en/A15959-10/926-1131-ND/2445429]
    160  * * [https://shop.gateworks.com/index.php?route=product/category&path=70_72 Gateworks Shop - Heatsinks ]
    161  
    162  
    163 Please also see this wiki page for more information on [wiki:ventana/thermal Ventana Thermal Information].
     140Please review our Thermal management page [wiki:ventana/thermalmanagement here]
     141
    164142
    165143[=#mtbf]