i.MX6 Solo Lite consumption current at 1GHz Arm clock

[kwangbogham]

Dear Sir,

I'm developing the face recognition project with your i.MX6 Solo Lite.

Our main clock must be about 1GHz and main power is battery.

So, the consumption current of i.MX6 Solo Lite (@ 1GHz Arm clock)  is important to our project.

I could find your two application note.
(AN4580 for i.MX6 Solo lite and AN4715 for i.MX6 Solo)

In the AN4580, there are just only three use case.(DSM, IDLE, MP3 Audio)

As you can see, these use case are a lot of different with our project because of ARM clock difference.

(Our ARM clock is about 1GHz, but mp3 audio clock is 400MHz)

In the AN4715, there are a lot of use cases.

I could find the similar use case(Dhrystone benchmark) with our project because it use 996MHz ARM clock.

In Dhrystone benchmark, GPU2D,GPU3D core, GPU3D shader, VPU and IPU1 clock is off. (We will turn these clock off)

Your application note(AN4715) show the consumption current at Dhrystone benchmark to us.

The total current is 624.8mA(without DDR3 I/O + memory)

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Here are some questions.

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The main reason which i send you these
question and acquire your answer is that our main supply(power source to run our application) is battery.

(alkali battery, 1.5V * 4EA) i.MX6 Solo Lite's current is important to our project.

Based on the Dhrystone benchmark of i.MX6 Solo in application note,

if the consumption current of i.MX6 Solo Lite is the almost same with i.MX6 Solo,

Maybe, i think that i can't use your i.MX6 Solo Lite.

Please, send me your answer at the below question as soon as possible:

1. Could you please explain what the Dhrystone benchmark test is?

2. Could you please send me the consumption current of i.MX6 Solo Lite at Dhrystone benchmark test?

(At second question, what i want to know is consumption current of i.MX6 Solo Lite only, without external interfacing device,

for example, DDR3, NOR32 and etc.)

Or,

3. Without the external interfacing devices(For example, DDR3, NOR flash, and etc),

Can i know the consumption current of i.MX6 Solo Lite at 1GHz ARM clock?

B&R

Kwangbog HAM

[igorpadykov]

HI Kwangbog

1. for source codes one can look at 

Dhrystone - Wikipedia, the free encyclopedia

2. for SoloLite power consumption data one can look at

AN4580 i.MX 6SoloLite Power Consumption Measurement

3. I am afraid such measurements are not available, as rough

estimation one can use power consumption of +Cortex A9 = 0.25 mW/Mhz

(250mW @ 1GHz) per http://www.arm.com/products/processors/cortex-a/cortex-a9.php

Best regards

igor

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[kwangbogham]

Dear igor,

Thank you for your help, but these answer are implications. (I had already found them on website before)

What i want to know is an objective evaluation and real test result as the application note 4580.(MP3 audio Playback)

But, this use case has a lot of difference between AN4580 and our application(face recognition).

As your answer,

if power consumption of Cortex A9 is 250mW @ 1GHz, please see the application note AN4715 for i.MX6 solo.

On AN4715 application note, the consumption current and watt of i.MX6 solo at 1GHz are about 624mA and 937mW.

1. Could you answer me in more detailed about Dhrystone benchmark test?

   Why this current is high when testing Dhrystone benchmark test?

2. If you are some similar experience and test result with our application(face recognition), could you post the result, plz?

3. if you are some test result at the below condition, could you share the result, please?

• CPU clock: 1GHz
• GPU2D clock: off
• GPU3D core: off
• VPU: on
• IPU1, IPU2: on
• MMDC CH0,CH1: on

Best regards,

Kwangbog HAM

[igorpadykov]

HI Kwangbog

I am afraid there are no more power consumption results

except published in official documents, like AN4580.

Best regards

igor