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Who has the lowest power MCU?

codinghead
7

Comments

August 5, 2020 15:17

Ouer problem: have a microcontroler with a ultra low consumption in "ultra deep sleep mode"
We tried PIC24FJ128GB202 alim 3.7v Li-On +regulator LDO from STM 3.3v deep sleep 684 micro amp
then we tried PIC32MM0256GPM064 alim 3.7v Li-On +regulator LDO from STM 3.3v deep sleep 350 micro amp
So we found a big différence betweenour test and the benchmark of Microchip
Is it différent in your expérience?

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January 29, 2015 17:22

For me the lowest power MCU seems to be the PIC16F1503 from microchip XLP. See http://www.microchip.com/pagehandler/en ... ducts.html. It uses only 25uA/MHz. Of course the actual power consumption should depend on the application, but this should be for a low demanding application. The power consumption can even be lower since in sleep it only uses 25nA! Can anyone beet this?

March 3, 2014 21:01

Hi Nakim,

For sure there are many facets to be considered and, yes, I agree that claiming an MCU is the "lower power" is becoming more and more a vacuous statement. Efforts are being made with, for example, the EEMBC low power benchmarking (see http://www.eembc.org/benchmark/ulp_sl.php) so that, as far as possible, an apples to apples comparison can be made.
In conjunction with RS Components we did demonstrate an on-line, web-browser based system for running hardware experiments to make a power consumption assessment. The demonstration was shown at Embedded World 2014 last week and received a warm response from both engineers and semiconductor manufacturers. We hope to be able to share more on this approach to making real hardware comparisons via web-browser controlled applications in the future.

Best regards, Codinghead

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March 1, 2014 17:18

Hello.

Today on the market vendors are figthing to show the lowest value on datasheet and other promotion materials but some keys paramters are still missing. For instance talking about ua/MHz is not really relevant if users has no idea of the platform efficiency (and not the core only). As an example a MSP430 has a score of 0.6 coremark/MHz while a STM32L1 (STMicroelectronics ARM coretx-M3) has a 2.9 coremark/MHz. It means the Cortex M3 core device will stay 4 time less in active more than the 16-bit core MSP.
Also vendros are tlaking about lowest power mode and very fast wakeup time but the energy and peak of current that occurs during fast is quite never mentionned except by some vendros.
Depending the aplication ultra-low-mcu will have different meaning. For example if I want to build a fire alarm detector, a gas meter or a mobile phone the ultra-low-power MCU will not be the same.
I was at embbedded world 2014 last week I have seen Atmel with the D20/21 family which is low-power only (not ultra) because of the high quiescent current. Also STMicro has announced the STM32L0 (Cortex M0+) which seems far ultra-low-power vs. Kinetis L family or EnergymicroMCUs both on Cortex-M0+ too.
I got a Nucleo eval board with Arduino connectors, I will make some test and let you know.

Thanks for reading.
Nakim.

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November 4, 2013 11:09

Hi Stillchip,

Thanks for your comments. What is driving your need for low-power in the applications you work on? Are they battery powered or is there something else limiting your power budget? Which three MCU families would you turn to first in your search for a low-power processing unit for you next application?

Thanks, Stuart

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November 3, 2013 11:43

I am new to this site and i want to know what is this all about. I really appreciate if you orient me everything in here. - Texas Lending

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November 1, 2013 09:59

In finding the lowest power CPU possible, there seems to be no method to avoid a completed design before knowing the actual power consumption of the MCU. One could even choose several different MCU's and achieve nearly equal power savings with careful design strategies. In many cases, the choice of CPU may have much less influence on the power consumption than the careful design based upon ones understanding of a particular MCU. I could even say that the compiler chosen may influence the power consumption depending upon how closely the actual compiler models the strategy of the designer/programmer. All in all, calling an MCU the "lowest power MCU" seems almost facetious in lowest power design.

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