st25r100 standby current problem

[SametKorur]

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.

[Ulysses HERNIOSUS]

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

[SametKorur]

Hi again,

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

[Ulysses HERNIOSUS]

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

[SametKorur]

Hi,

This current is the current drawn by the X-NUCLEO-09A1 development board, I have already mentioned above. If you examine the graphs, it draws an average of 200uA current during sleep. I removed the power LED on the development board. The inputs of the other LEDs are at GND, but I still could not get close to the wake-up current in the datasheet values ​​of the st25r100. I gave you the code.

[Brian TIDAL]

Hello,

Could you confirm whether the issue described in your previous post is now resolved? If so, please click Accept as Solution in the related post.

Additionally, could you provide details about the management of the ST25R100 IRQ pin in your application? Specifically:

• Do you use a dedicated blocking thread waiting for the ST25R100 IRQ event?
• Or do you use periodic polling to read the IRQ registers?

Could you also connect a logic analyzer to the SPI (CLK, MOSI, MISO, CS) and the ST25R100 IRQ pin and share the trace in Power Down mode and then in Wake Up mode ?

Regards,
BT

[Ulysses HERNIOSUS · Accepted solution]

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