interfacing external oscillator to STM32F407igt6

ecmanja · ‎2014-07-25

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 · ‎2014-07-25

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 · ‎2014-07-25

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

Yageo Multilayer Ceramic Capacitors MLCC - SMD/SMT 20PF 50V 5% 0603</span></div>

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