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High consumption of SoC supply rail in Deep-Sleep Mode

Question asked by Damien Vielpeau on May 22, 2015
Latest reply on Jun 2, 2015 by Damien Vielpeau

Hello everybody,

 

I am evaluating the power consumption of the imx.6 SoloLite using the Freescale evaluation kit.

I follow the Application Note 4580 "i.MX 6SoloLite Power Consumption Measurement".

 

in Deep-Sleep mode, I obtain a value very high comparing to the Application Note :

It concerns the rail  VDD_SOC_IN + VDD_PU_IN,  I obtain 5.4mW whereas the Application Note indicates 0.550mW !

The other measurements are normal.

 

My procedure to make the measurement is :

- Configure the Linux kernel to disable all Multimedia and Graphics drivers :

     Device Drivers > Multimedia Support > OFF

     Multimedia Drivers > Graphics Support > OFF

- Build "core-image-minimal" with yocto.

- Boot & put the system on deep-sleep mode executing :

     $ echo mem > sys/power/state

- Measure voltage between pins of a resistance 0.020ohm soldered at SH3 to deduce the current of the channel, then the power consumption.

 

I think my process of measurement is correct because the other measurements I made are normal.

Maybe I need to configure something differently ?

 

Thanks for your help

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