Power consumption (Naon)
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Introduction[edit | edit source]
Providing therocial maximum power consumption value would be unuseful for the majority of system designer building their application upon Naon module because, in most cases, this would lead to an oversized power supply unit.
Several configurations have been tested in order to provide figures that are measured on real-world use cases instead. Please note that Naon platform is so flexible that is virtually impossible to test for all possible configurations and applications on the market. The use cases here presented should cover most of real-world scenarios. However actual customer application might require more power than values reported here. Generally speaking, application specific requirements have to be taken into consideration in order to size power supply unit and to implement thermal management properly.
Testbed[edit | edit source]
Measurements have been performed on the following platform:
- Naon SOM: DAF7910C0R
- carrier board: NaonEVB-Lite
- System software: NELK 1.0.0
- power monitor: INA226 (reference U20 of NaonEVB-Lite schematics).
- ARM Cortex-A8 frequency: 600 MHz
- SDRAM size: 512 MByte
- SDRAM frequency: 400 MHz
- HDVICP2 frequency: 306 MHz
Use cases[edit | edit source]
In the following table there's the summary result of data reported by INA226 in different checkpoint.
| Checkpoint | Input Voltage [mV] | Shunt Voltage [mV] | Current [mA] | Power Consumption [mW] |
|---|---|---|---|---|
| Linux Prompt (M3 Unloaded) | 3266 | 8 | 779 | 2550 |
| Linux Prompt (M3 Loaded) | 3261 | 10 | 1040 | 3400 |
| cpuBurnA8 (M3 Loaded) | 3258 | 12 | 1235 | 3900 |
| decode & display H264 1080p60 on HDMI | 3258 | 12 | 1219 | 3975 |
| decode & display H264 1080p60 + cpuBurnA8 | 3255 | 14 | 1352 | 4450 |
Additional notes and reference:
- M3 Unloaded means that the two Cortex-M3 firmware has not yet been started (see /etc/init.d/load-hd-firmware.sh)
- for decode/display test the sample /usr/bin/runDecodeDisplayHDMI has been used
- cpuburn heavily uses Cortex-A8 and Neon to maximize power consumption and heat spreading. See the debian package information (burnCortexA8.s) for more information
- please note that shunt voltage value is rounded
