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AVILL.3
Associate II
March 15, 2022
Solved

1.8V GPIO on STM32WB55 Nucleo Pack

  • March 15, 2022
  • 6 replies
  • 2660 views

Is there a way to use 1.8V NAND Memory Chip using Quad SPI GPIOs in STM32WB55 Nucleo Pack?   

  • I already wired-up the 1.8V NAND chip and connected to Quad SPI pins of the Nucleo Pack, but I haven't powered this board up yet.
This topic has been closed for replies.
Best answer by AVILL.3

Finally, I was able to convert the board to have 1.8V in GPIOs.

The idea is based on the user manual's Power management instruction, wherein to take in external 1.8V supply and bypass the PM components related to USB voltage input.

0693W00000KcmRLQAZ.png

6 replies

TDK
March 15, 2022

Looks like the board is designed to run the chip from 3.3V, which is much too high for the 1.8V chip.

No doubt it could be done with a level shifter between the two or other hardware modifications to make the board run from 1.8V, but it would not be easy. It's possible other chips are expecting 3.3V and changing VDD will break their functionality.

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AVILL.3
AVILL.3Author
Associate II
March 15, 2022

There is a 1.8V pin in the Nucleo Pack, and there is also a VDD for the STM32WB55.

Can that that 1.8V be connected to VDD (or Reference pin) so the GPIOs will be on 1.8V?

If not possible, what Level Shifter off-the-shelf board can you reco (fast shifting up to 40MHz at least).

Thanks in advance.

AVILL.3
AVILL.3Author
Associate II
March 15, 2022

For the level shifter, is this viable? TXB0108?

0693W00000Kck5SQAR.png

AVILL.3
AVILL.3Author
Associate II
March 15, 2022

Here is my wired NAND Mem Chip to the Nucleo Board Pack:

0693W00000Kck6fQAB.png

TDK
March 15, 2022
There’s very little chance that will work correctly at 40 MHz given the length of the leads.
I’m not sure on the 1.8V questions. I would consult the schematics to verify the 1.8V pin is a viable supply and that the voltage is indeed 3.3V.
The level shifter data sheet should list bandwidth limits. I can’t imagine it being hard to find one for 40MHz.
"If you feel a post has answered your question, please click ""Accept as Solution""."
AVILL.3
AVILL.3AuthorBest answer
Associate II
March 16, 2022

Finally, I was able to convert the board to have 1.8V in GPIOs.

The idea is based on the user manual's Power management instruction, wherein to take in external 1.8V supply and bypass the PM components related to USB voltage input.

0693W00000KcmRLQAZ.png