External oscillator input

[Welcome_123]

In application we are using MCU part no STM32G0KCIU6 of LQFP32 / UFQFPN32 - GP package, can external oscillator of frequency 16MHz (Example: Part no ASEMB-16.000MHZ-LY-T) can be connected to pin no 2 which is dedicated for LSE clock frequency 32KHz. As per datasheet Pin assignment and description list Pin No 2 of MCU has additional options to configure as OSC_IN whether this pin can be configured for HSE requirement? Can external oscillator of frequency 16MHz can be connected to this Pin?

[mƎALLEm]

Hello @Welcome_123 ,

There is no STM32G0KCIU6 device in ST portfolio, could you please provide the correct part number?

[Welcome_123]

MCU Part no STM32G0C1KCU6

[Andrew Neil]

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@Welcome_123 wrote:

MCU Part no STM32G0C1KCU6

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Then this is the datasheet:

https://www.st.com/resource/en/datasheet/stm32g0c1kc.pdf#page=83

For 16MHz, you'd need to use OSC_IN - not OSC32_IN: see correction below 

 

EDIT - correction:

Ah - Now I see that pin 2, PC14, can be either OSC_IN or OSC32_in - so that should be OK?

 

[Andrew Neil]

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@Welcome_123 wrote:

MCU part no STM32G0KCIU6 

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That doesn't seem to be a valid part number?

Looking at the STM32G0B1xB/xC/xE datasheet, the OSC32_IN specs are:

https://www.st.com/resource/en/datasheet/stm32g0b1kc.pdf#page=82

 

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@Welcome_123 wrote:

 Pin No 2 of MCU has additional options to configure as OSC_IN whether this pin can be configured for HSE requirement? Can external oscillator of frequency 16MHz can be connected to this Pin?

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You mean OSC32_IN ?

Check the datasheet for the part you're actually using, but it looks like a NO.

Why not use the OSC_IN pin - which is specified for high-speed use:

 

[STTwo-32]

I think you are toking about the STM32G0C1KCU6 or STM32G0B1KCU6, for both MCUs, the Pin 2 (PC14-OSC32_IN) can be used as OSC32_IN, OSC_IN so, you should be able to use a 16MHz oscillator on this pin.

 

Best Regards.

STTwo-32

 

[Andrew Neil]

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@STTwo-32 wrote:

 Pin 2 (PC14-OSC32_IN) can be used as OSC32_IN, OSC_IN

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So it does!

But that makes Table 14 (which I cited earlier) a bit misleading: the limitation isn't on the pin (as the table suggests) - it's on whichever oscillator path its feeding...

[Welcome_123]

yes need a crystal oscillator powered with 3.3V

[Andrew Neil]

You suggested one in your opening post?

[mƎALLEm]

According to its datasheet: