hi guys,
i used a SMD type 32.768Khz crystal for my project with two 10pF to GND, its not functioning. but once i change the crystal to TH type crystal, it work. May i know what is happening? (note: i only change crystal but remain same connection and capacitance.)

 

a crystal will not oscilate by itsself, it needs a transistor or other amplifying device to oscilate. it can act as a narrow bandwidth filter, tho.

 

you could try leave out the caps or only use 5pf for the SMD part

 

Thanks for your suggestion
i tried

you could try leave out the caps or only use 5pf for the SMD part

but its also not working.
i tried 27pF as well but also not working.

 

Hello,

To what is this circuit connected?
You have the labels XTAL_IN_32KHZ_SW and XTAL_OUT_32KHZ_SW in your schematic.

Bertus

 

Hello,

To what is this circuit connected?
You have the labels XTAL_IN_32KHZ_SW and XTAL_OUT_32KHZ_SW in your schematic.

Bertus

hi,
i connected to a DIP switch to make option between crystal and clock generator. Because the crystal not functioning, so i force to use a clock chip provide frequency. but i want find out the problem, in case i face the same problem again.

 

Hello,

What chip are you using?
Did you "tell" the chip to use the internal or external oscillator?

Bertus

 

Where do you use that? In a micro?

but once i change the crystal to TH type crystal, it work. May i know what is happening?
View attachment 76835

May I know in turn, what that change is? The settings in some IDE to program a micro?

Do not asume that people knows what you are talking about. Try again.