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BB-440 Industrial Edge Controller powered by Raspberry Pi

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March 12, 2020 09:07

A minor technical detail - unless the core voltage is reduced at lower frequencies, the speed of transitions is usually not reduced by operating at a lower frequency. Rather, the reduction is the number of transitions per unit time. The highest currents occur during the transitions. Slow transitions frequently cause increased power dissipation, as the transistors spend more time in the linear region. On some processors, lower speeds may allow operation at a lower CPU core voltage, which also reduces power. I haven't checked if the Pi's processor falls in that category.

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March 13, 2020 14:18

@BradLevy Yes you are absolutely right. To have a much bigger impact on the amount of heat generation, the core voltage would have to be reduced in addition to the clock frequency. I believe the raspberry pi, as it currently stands, reduces the core voltage when the Broadcom SoC starts to throttle it’s clock frequency to lower values. There is a useful command available which allows the core voltage to be monitored. The command ‘/opt/vc/bin/vcgencmd measure_volts core’ can allow a user to see what’s happening to the core volts when throttling starts.

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