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Andrew Neil
Andrew Neil
Super User
April 29, 2021
Question

X-NUCLEO-LPM01A PowerShield - Dynamic Current Range Too Limited?

  • April 29, 2021
  • 2 replies
  • 3001 views

The X-NUCLEO-LPM01A PowerShield has a dynamic current range maximum of only 50mA.

This is a long way short of the maximum current found in many STM32 applications; eg.

  • STM32WL - max Tx current is 120mA;
  • B-L072Z-LRWAN1 - max Tx current of the radio module is 128mA

Particularly annoying is that the PowerShield will simply abort the acquisition when the 50mA limit is exceed; eg, see:

https://community.st.com/s/question/0D53W00000KpzoVSAR/stm32l562edk-current-up-to-150ma

and:

https://community.st.com/s/question/0D53W00000ku5QLSAY/stm32cubemonpower-unhelpful-error-message-released-due-to-connection-issue

This makes the PowerShield useless in these applications.

Is there any workaround to this?

Even if it just gave an 'out-of-range' value in the logs, that would be preferable - then we could get measurements for all except the peaks using the PowerShield, and only have to find other means to measure the peaks.

This topic has been closed for replies.

2 replies

Richard.Chvr
Richard.Chvr
ST Technical Moderator
April 29, 2021

Hi @Andrew Neil​ ,

As mentioned in https://www.st.com/content/st_com/en/products/development-tools/software-development-tools/stm32-software-development-tools/stm32-performance-and-debuggers/stm32cubemonpwr.html, ST offers currently 2 solutions that allow users to monitor current.

  • From 100 nA up to 50 mA with ~2% accuracy for the X-NUCLEO-LPM01A expansion board
  • From 300 nA up to 150 mA with ~2% accuracy for the Energy Meter of the STM32L562E-DK Discovery kit

Also I think that the STM32L562E-DK Discovery kit could be the appropriate solution for your needs.

https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/mcu-mpu-eval-tools/stm32-mcu-mpu-eval-tools/stm32-discovery-kits/stm32l562e-dk.html

              Moreover a new solution with a highest max current value is currently under development. Due to business reasons we can’t communicate about future availability of this new product.

Regards

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Andrew Neil
Andrew NeilAuthor
Super User
April 30, 2021

Ah - thanks for that. Worth a look ...

And looking forward to the new product ...

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
Andrew Neil
Andrew NeilAuthor
Super User
September 13, 2021

At the time of starting this thread, the STM32-LPM01-XN firmware for the X-NUCLEO-LPM01A board was at v1.0.1.

I see that the STM32-LPM01-XN firmware for the X-NUCLEO-LPM01A board is now at v1.0.6.

But I can't see any Release Notes.

Has anything been done about the behaviour on overload?

Again:

"Even if it just gave an 'out-of-range' value in the logs, that would be preferable - then we could get measurements for all except the peaks using the PowerShield, and only have to find other means to measure the peaks."

 EDIT

Asked as a separate question:

https://community.st.com/s/question/0D53W000014w80YSAQ/where-are-release-notes-for-the-stm32lpm01xn-firmware

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
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