interfacing external oscillator to STM32F407igt6

[ecmanja]

Posted on July 25, 2014 at 12:44

Hi all,

        I have to interface external oscillator to stm32f407igt6 which is having 16Mhz internal frequency and i need to boost it to 168Mhz frequency by connecting a 25Mhz external  oscillator so can anyone give capacitor and resistor values that i need to interface external oscillator to my STM32F407igt6. Thank you,

[tlegrain23]

Posted on July 25, 2014 at 14:16

Take a look at ST's AN2867 - Application Note for Oscillator design guide.

Schematics for development boards would also be a good place to look.

[Tesla DeLorean]

Posted on July 25, 2014 at 14:34

An external oscillator, or an external crystal? For an oscillator (TCXO, OCXO, etc) connect HSE_IN, and BYPASS mode. Change PLL and HSE_VALUE to reflect.

Review BOM for STM32 EVAL series boards (w/Ethernet) HC-49S-C16QSA-25M

http://search.alkon.net/cgi-bin/pdf.pl?pdfname=05616.pdf

-20 to +70 C 16pF Load Capacitance Frequency Tolerance  +/-20*10-6 Frequency Stability +/- 30*10-6 AT Fundamental 25 MHz CC0603JRNPO9BN200

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