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TMark.14
Associate III
September 8, 2021
Solved

STM32g491 Vref missing from Cube

  • September 8, 2021
  • 3 replies
  • 1057 views

In ST Cube IDE 1.6.0 project, Cube MX view - > vrefbuf is missing from syscfg page

This topic has been closed for replies.
Best answer by TDK

The STM32G491KE doesn't have a VREF+ pin. It's bonded internally to VDDA. Enabling the voltage buffer would mean it would need to fight with VDDA, clearly not a workable scenario.

From the datasheet:

The VREF+ pin is double-bonded with VDDA on some packages. In these packages the internal voltage reference buffer is not available.

3 replies

TDK
September 8, 2021

It's there for me. Share your IOC file if able and/or screenshot. CubeIDE v1.7.0 is latest.

0693W00000DmbZuQAJ.png

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TMark.14
TMark.14Author
Associate III
September 8, 2021

Chip I am using is STM32G491KE

TDK
TDKBest answer
September 8, 2021

The STM32G491KE doesn't have a VREF+ pin. It's bonded internally to VDDA. Enabling the voltage buffer would mean it would need to fight with VDDA, clearly not a workable scenario.

From the datasheet:

The VREF+ pin is double-bonded with VDDA on some packages. In these packages the internal voltage reference buffer is not available.

"If you feel a post has answered your question, please click ""Accept as Solution""."