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NELK Power Management

665 bytes added, 15:29, 5 December 2012
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* 0% on both ''Processing'' columns means that the subsystem is turned on but without input
* shut voltage has been measured on R422 (10mOhm), in [[:Category:NaonEVB-Mid|NaonEVB-Mid]], which feeds [[:Category:Naon|Naon]] module 3.3V power supply
 
== Tools ==
 
=== Measurements script ===
 
Measurements are performed accessing the INA226 device connected to the I2C bus. The following commands can be saved as a shell script (e.g. read_power_values) and run to collect the measurements data:
 
<pre>
#!/bin/sh
cd /sys/devices/platform/omap/omap_i2c.3/i2c-3/3-0041
echo "input voltage $(cat in1_input)V"
echo "shut voltage $(cat in0_input)mV"
echo "current sink $(cat curr1_input)mA"
echo "power consumption $(expr $(cat power1_input) / 1000) mW"
</pre>
 
<pre class="board-terminal">
root@dm814x-evm:~# ./read_power_values
input voltage 3289V
shut voltage 10mV
current sink 978mA
power consumption 3200 mW
</pre>

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