wiki:newport/powerthermal

Newport Thermal Ratings

Gateworks pre-installs a heatsink on the CPU for all Newport boards. This heatsink provides basic cooling for the board during development but customers need to design their own thermal solution based on their particular enclosure, environment and operating conditions.

The Cavium CN80xx Octeon TX CPU is rated at:

  • 800MHz Dual Core (CN8020 - BGA676)
    • Max: 100C Tj (Junction Temp), 95C Tc (Case Temp)
    • Min: -40C Tj (Junction Temp), -40C Tc (Case Temp)
  • 1.5GHz Quad Core (CN8030 - BGA676)
    • Max: 95C Tj (Junction Temp), 90C Tc (Case Temp)
    • Min: -40C Tj (Junction Temp), -40C Tc (Case Temp)

Newport Temperature Readings

Newport has the ability to measure the board temperature and CPU temperature.

Both values are important, but the CPU will be the hottest component and thus should be watched closely.

From Gateworks testing, it has been observed the CPU temperature is typically around 20C higher than the measured board temperature.

Warning There is no automatic shutdown of the CPU / Board if the temperature goes over the maximum rating of the CPU. Therefore, the temperature needs to be monitored and handled appropriately. This feature is coming soon, please contact support@… for more information.

CPU Temperature

Note this is only available on newer revision Newport boards

This requires up to date software (Device Tree, GSC, Kernel, etc)

This is using a MAX6642 temperature sensor over I2C and is exposed through the Linux hwmon interface.

Typically the GSC will exist on hwmon0 and the MAX6642 will exist on hwmon1.

The MAX6642 has a local and remote temperature, with the remote temperature being the temperature of the CPU. This is typically going to be temp2_input.

To read the temperature value, see the below given example, showing a temperature of 97.250C (value returned divided by 1000)

root@xenial-newport:~# cat /sys/class/hwmon/hwmon1/temp2_input 
97250

Note that temp2_max is declared as the max value of the CPU rating, as shown in this commit here

Board Temperature

can be measured through the GSC as shown on the GSC wiki page here: Reading Newport Board Temperature

Newport Power Dissipation

The following table provides typical power consumption for the various Newport board models without any attached peripherals.

Board GW6100 GW6104 GW6200 GW6204 GW6300 GW6304 GW6400 GW6404
Linux Prompt 4.7W TBDW 5.17W 6.95W 6.0W 8.2W 7.1W 9.0W
Linux Stress 5.9W TBDW 6.27W 10W 7.2W 10.3W 8.3W 11.8W
  • GW6100 = Dual Core 800Mhz CN8021, 1GB DDR4, 8GB eMMC
  • GW6104 = TBD
  • GW6200 = Dual Core 800Mhz CN8021, 1GB DDR4, 8GB eMMC
  • GW6204 = Quad Core 1.5GHz CN8031, 2GB DDR4, 8GB eMMC, GPS, CAN
  • GW6300 = Dual Core 800MHz CN8020, 1GB DDR4, 8GB eMMC
  • GW6304 = Quad Core 1.5GHz CN8030, 2GB DDR4, 8GB eMMC, GPS, CAN
  • GW6400 = Dual Core 800MHz CN8020, 1GB DDR4, 8GB eMMC
  • GW6404 = Quad Core 1.5GHz CN8030, 2GB DDR4, 8GB eMMC, GPS, CAN, SFP

Newport Thermal Image

The following image is for the GW6300 board with the stock Gateworks heatsink.

  • Test Condition: 2 hours, Linux prompt, natural convection
  • Tambient @ 25C, CPU @ 75.9C, Board @ 67.5C.

Thermal Picture GW6300

Newport Heatsinks

The Newport has CPUs that have the following package sizes:

  • 27x27mm (GW63xx,GW64xx)
  • 21x21mm (GW61xx,GW62xx)

The Newport board comes with a heatsink that has a fan on top for cooling (fansink).

  • GW10130 Fansink - Used on GW61xx, GW62xx
  • GW10129 Fansink - Used on GW63xx, GW64xx

The fan is automatically controlled through the fan set points as defined here

Troubleshooting

Please review the FAQ Article about Board Temperature

Last modified 13 days ago Last modified on 11/01/2018 04:43:44 PM

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