Hello everyone,
I'm looking to add some bypass/decoupling capacitor on a microcontroller unit but I was thinking which rail would be the best to bypass/decouple.
I've got some options like VDD-VDDA-VSSA etc etc, i'm not an expert in this just an hobbyist.
Thanks!
I'm looking to add some bypass/decoupling capacitor on a microcontroller unit but I was thinking which rail would be the best to bypass/decouple.
I've got some options like VDD-VDDA-VSSA etc etc, i'm not an expert in this just an hobbyist.
Thanks!
All of them? What are the most important to do?
VDD, VSS_DCDC ~ VDDA, VSSA?
One last question, if the microcontroller's cpu works up to 150mhz would be better to use 0.01uf decoupling or 0.1uf?
VDD, VSS_DCDC ~ VDDA, VSSA?
One last question, if the microcontroller's cpu works up to 150mhz would be better to use 0.01uf decoupling or 0.1uf?
Your first post is not clear to me: what do you mean by 'microcontroller unit '?
Is this a ready made board with microcontroller such as an Arduino or similar?
Or are you building your own board with a microcontroller ic?
If the first then it should be sufficient to decouple the main supply.
If the latter then you need the datasheet.
Is this a ready made board with microcontroller such as an Arduino or similar?
Or are you building your own board with a microcontroller ic?
If the first then it should be sufficient to decouple the main supply.
If the latter then you need the datasheet.
this but the datasheet isn't pubic, so i should decouple the vdda/vssa ~ vdd/?
this is the mcu internal schematic pins, any suggestion?
What about the decoupling capacitor size?
Thanks
That schematic shows all the requisite decoupling already - if this is the module you have its all done for you.
Normally you'd assume as a bare minimum for any logic chip to have 100nF ceramic cap on every single supply
pin to ground within mm of the chip.
Normally you'd assume as a bare minimum for any logic chip to have 100nF ceramic cap on every single supply
pin to ground within mm of the chip.