2024-12-09 11:05 AM
I notice that on the NUCLEO-H753ZI board schematic and BOM, the load capacitors are not populated for X2. My thought is that these caps must exist elsewhere, either built into the crystal, or integrated into the STM32H743.. But I do not see any mention of integrated capacitors for either the microcontroller or the NX3215SA crystal datasheets. How can this work?
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2024-12-09 01:15 PM
No, you'll need load caps. The 32 KHz used to be a DNF also, on a lot of the NUCLEO boards
Pull the BoM from the product's "CAD Resources" tab/page
Check if X2 using a 6, 9 or 12pF crystal. Most of the ST parts used/expected 6-7pF crystals
2024-12-09 01:15 PM
No, you'll need load caps. The 32 KHz used to be a DNF also, on a lot of the NUCLEO boards
Pull the BoM from the product's "CAD Resources" tab/page
Check if X2 using a 6, 9 or 12pF crystal. Most of the ST parts used/expected 6-7pF crystals
2024-12-10 02:32 AM
Hello @BobaJFET ,
I think schematics is missing C71 and C72 capacitors as X2 is soldered. So either you solder X2, C71, C71 or you can unsolder all of them if the external crystal is not used.
There is no internal CL capacitors on the chip.
2024-12-10 04:37 AM
Much appreciated.