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Atlas 200 Hardware Development Guide 03

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Heat Dissipation Design

Heat Dissipation Design

A complete heat dissipation solution, including heat sinks and fans, is required to ensure proper running of the Atlas 200. In addition, heat conducting materials must be used to ensure that the Atlas 200 is fully in contact with the metal covers to ensure that the Atlas 200 works at the allowed temperature range. The Atlas 200 dissipates heat mainly using the upper metal cover. It can also dissipate heat using the lower metal cover. The heat dissipation effect is better with both sides.

Figure 5-1 Heat dissipation structure
  • Do not remove the metal covers (including the upper and lower covers) of the Atlas 200.
  • Once the heat dissipation component is removed, the thermal conductive material cannot be reused.
  • Point 1 in Figure 5-1 indicates the Atlas 200 cover temperature test point. When the Atlas 200 is running, ensure that the temperature measured at this point does not exceed 80°C in any case.
  • Point 2 in Figure 5-1 indicates the junction temperature of the Ascend 310. A built-in temperature sensor reads and reports the temperature value. When the Atlas 200 is running, ensure that the temperature reported at this point does not exceed 100°C in any case.

For details about the thermal performance parameters of the Atlas 200, see Table 5-1.

Table 5-1 Atlas 200 thermal resistance

Parameter

Description

Atlas 200 thermal resistance

Working mode: 16 TOPS

Rjc

0.8°C/W

Rjb

5°C/W

Calculating the Thermal Resistance

  1. To determine the thermal resistance Rca of the heat dissipation solution required by the Atlas 200, calculate Tc (temperature of point 1 in Figure 5-1) using the following formula:

    Tjmax=Power x Rjc+Tc

The values of parameters in the formula are as follows:

  • Tjmax = 105°C (Maximum operating temperature threshold of point 2 in Figure 5-1. It is recommended that the long-term operating temperature be 100°C or lower.)
  • Rjc = 0.8°C/W
  • Power: The power consumption of the Atlas 200 needs to be tested on the PCB.
  1. Calculate Ta.

    Ta indicates the highest operating temperature supported by the Atlas 200.

  2. Calculate the thermal resistance of the heat dissipation solution required by the Atlas 200 according to the following formula:

    Rca = (Tc - Ta)/Power

To ensure that the Atlas 200 works properly, the thermal resistance of the designed heat dissipation solution must be less than the calculated value in the worst case.

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Updated: 2019-11-18

Document ID: EDOC1100079542

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