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TMark.14
TMark.14
Associate III
Sep 8, 2021 8:05 PM UTC
Solved

STM32g491 Vref missing from Cube

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

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TDK
TDKBest answer
Sep 8, 2021 9:43 PM UTC

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.

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3 replies

TDK
TDK
Sep 8, 2021 8:48 PM UTC

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
Sep 8, 2021 8:59 PM UTC

Chip I am using is STM32G491KE

TDK
TDKBest answer
Sep 8, 2021 9:43 PM UTC

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""."
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