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SametKorur
Associate III
June 30, 2025
Solved

st25r100 standby current problem

  • June 30, 2025
  • 6 replies
  • 661 views

Hello, I have x nucleo 09a1 and I managed to run it in wake up mode with a different processor than stm and register. But there is a high current in wake up mode and power down mode. I am sharing the relevant graphics and code, please help.

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Best answer by Ulysses HERNIOSUS

Hi,

so, I assume you are you are measuring on the 5V supply pin of the X-NUCLEO-NFC09A1?! Bent it away or used an interposer?

LEDs disabled: Good - you hadn't mentioned at first.

Please beware that the current IWU on DS does not include the power on the antenna. Please see AN5993 for a more elaborate estimation of wake-up power consumption in the system.

Brians suggestions would likely help to identify the root cause of the ~10mA pulses on your last graph.

BR, Ulysses

6 replies

Ulysses HERNIOSUS
Ulysses HERNIOSUS
ST Technical Moderator
June 30, 2025

Hi, 

please formulate questions!

Where are you actually measuring the current shown here?

Having comments in English (at least on PDF) would also help!

BR, Ulysses

SametKorurAuthor
Associate III
June 30, 2025

Hi again,

Attached is the English version of the pdf. I measure current with a digital multimeter called joulescope.

Ulysses HERNIOSUS
Ulysses HERNIOSUS
ST Technical Moderator
June 30, 2025

Hi,

thx, you answwered now "How" you are measuring but not "Where" you are measuring / which current you are measuring. 

Also: please put questions. Most of what I am seeing is clear to me. But I could only guess what is not clear to you!

Ulysses

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