Hello,
I want to design a PCB with STM32H743VIT6 MCU. But I am not sure how can I choose crystal and capacitors properly. In STM32H743VIT6 datasheet there is one section about this topic;
according to this information should I take the Cstray value as a10? (Many other documents suggesting 3-5 pf)
so if I choose 16MHz 12pf Capacitor my values are gonna be like this;
CL = 12pF
Cstray = 10pF
C1 and C2 load caps,
Formula : CL(crystal)=( (CL1 * CL2) / (CL1 + CL2) )+Cstray
CL1 = CL2 --> C
12 = ( C / 2 ) + 10pF
C values are should be 4 pF instead of 12pf in the circuit ?
@RobK1 wrote:
You might want to read this:
How to select a compatible crystal and load capaci... - STMicroelectronics Community
Cs is estimated at 3pF.
Refer to the calculation in the knowledge base shared by @RobK1 . You can use the Excel file calculator attached to the knowledge base:
+ AN2867 "Guidelines for oscillator design on STM8AF/AL/S and STM32 MCUs/MPUs"
and there is a table in that app note that lists the recommended crystals 6 Recommended crystals for STM8AF/AL/S MCUs
