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about crystal used for 8051

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Author
Mohit Joshi
Posted
4-Oct-2011 12:17 GMT
Toolset
C251
New! about crystal used for 8051

Hello sir.....

i am new in the field of controllers.....
i have some doubts to ask....

The crystal which we are using ..its made up by which material?

Why we use capacitor with crystal in microcontroller circuit?

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Author
Per Westermark
Posted
4-Oct-2011 12:44 GMT
Toolset
C251
New! RE: about crystal used for 8051

Ever tried to google for any crystal FAQ?

Or would that give too much information?

It isn't too uncommon that the term quartz crystals is used. That should give you an idea. Of course, there could be other piezoelectric materials used.

Why have burden capacitors? Not sure it can be answered unless you already know a bit about resonance circuits. Now would be a good idea to look at them nice crystal faqs available.

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Author
Mohit Joshi
Posted
4-Oct-2011 17:16 GMT
Toolset
C251
New! RE: about crystal used for 8051

thank you sir.......

but as we know...property of piezoelectric materials(crystals)....

when we give electrical voltage to it.....it will give mechanical vibrations as an output......so how we are giving this mechanical output as a clock to our microcontroller ????/

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Author
Andrew Neil
Posted
4-Oct-2011 18:31 GMT
Toolset
None
New! RE: how we are giving this mechanical output as a clock to our microcontroller

We aren't.

The mechanical vibrations affect the electrical properties.

Google for the details if you're really interested...

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Author
Mohit Joshi
Posted
4-Oct-2011 18:39 GMT
Toolset
C251
New! RE: how we are giving this mechanical output as a clock to our microcontroller

Thnk u sir. . . I will sure search in goole . . . .2moro mornin. . . . B'coz . . . .i really want to know. . . . .how the uC is getting clock as electric signal. . . . . .from two terminals of crystal. . . . . . .though the crystal produces vibration. . . .

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Author
Andrew Neil
Posted
4-Oct-2011 18:50 GMT
Toolset
None
New! RE: how the uC is getting clock as electric signal

Quartz crystal oscillators were developed for high-stability frequency references during the 1920s and '30s - there is nothing new or ground-breaking here!

Any decent electronics textbook should cover it, and there's plenty of stuff online.

BTW: the dot key on your keyboard seems to be faulty...

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Author
Mohit Joshi
Posted
4-Oct-2011 19:02 GMT
Toolset
C251
New! RE: how the uC is getting clock as electric signal

Thnk u, . . . . . .nd no sir dot key is not faulty on my keyboard. . . . . .bt this is my habbit . . . .i used to do this when typin msgs on my cell. . . .

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Author
Tamir Michael
Posted
4-Oct-2011 19:21 GMT
Toolset
C251
New! RE: how the uC is getting clock as electric signal

i used to do this when typin msgs on my cell. . . .

You in jail brother?

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Author
Mohit Joshi
Posted
4-Oct-2011 19:26 GMT
Toolset
C251
New! RE: how the uC is getting clock as electric signal

No . . . .man. . . i m nt in jail . . . . . . .dis is jus my habbit. . . . . . . . .

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Author
Mohit Joshi
Posted
4-Oct-2011 19:18 GMT
Toolset
None
New! RE: how the uC is getting clock as electric signal

Sure sir. . . I will try to find it in google . . . . .
bt sir can u plz suggest me any book or any link . . .about it. . . . So that i can clearly understand. . . . .wts there inside in the crystal . . . . .nd how it is giving clock pulses to our controller. . . . . . .

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Author
erikdo malund
Posted
4-Oct-2011 19:43 GMT
Toolset
None
New! the miracle of a video monitor

is that you do not waste ink typing all the characters in a word

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Author
Andrew Neil
Posted
4-Oct-2011 21:54 GMT
Toolset
None
New! RE: can u plz suggest me any book or any link

Just type "quartz crystal oscillator" into google - how hard can that be?!

http://www.lmgtfy.com?q=quartz+crystal+oscillator

Read-Only
Author
Andrew Neil
Posted
4-Oct-2011 12:57 GMT
Toolset
C251
New! RE: i am new in the field of controllers

Also new in the field of electronics?

Here's some info about the function of the crystal for an 8051:
http://www.8052.com/tuttimng.phtml

As already noted, there's plenty to be found with google:
http://www.lmgtfy.com?q=microcontroller+crystal+oscillator

for example, here's Maxim's APPLICATION NOTE 2154,
"Microcontroller Clock—Crystal, Resonator, RC Oscillator, or Silicon Oscillator?"

Abstract: Crystals, ceramic resonators, RC (resistor, capacitor) oscillators, and silicon oscillators are four types of clock sources for use with a microcontroller (µC). The optimal clock source for an application depends on many factors including cost, accuracy, and environmental parameters. This application note discusses the determining factors for selecting a microcontroller clock. Oscillator types are compared.

http://www.maxim-ic.com/app-notes/index.mvp/id/2154

You should be able to take it from there...

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