AVR-Chat

Pigeon wrote:
> Hmm..  because I would rather have something super simple.. and high 
> quality, I like the idea of the
> crystal clock oscillator
> http://rocky.digikey.com/WebLib/Epson/Web%20Data/SG-51,531%20Series.pdf
>  
> but my question is.
> I see
> pin1: 0E
> pin7: GND
> pin8: OUT
> pin14: Vdd
>  
> but what pins go to what? (do I need any external caps/resistors)
>  
> I have seen a schematic that had xtal 1 go to the crystal clock 
> oscillator.. then xtal2 go to another avr's xtal 1.. but that isn't what 
> i want.
>  
> I guess the pdf of this schematic expects an expert to be reading it :/
>  
>  
> what do you'll think?
>  
> Lee

The ones I use (from Radio Spares in Au (only as I needed 2 and they 
deliver ;))


Pin 1 is No Connection
Pin 7 is Ground
Pin 8 is Output
Pin 14 is Vcc

Not all the modules have the inverted output, some even have just a 
buffer so that it can drive 2 loads.

All you need for most apps is Pins 7,8,14 and leave pin 1 open circuit.

The only special attention I give them is a 10uF electro  and a 0.1uF 
mono caps as close as possible (the mono is usually on the bottom as I 
do mainly SMD these days.

In most products I design I have 2 versions, 1 uses a crystal, and the 
other the internal oscillator. but unless it is a package that can have 
its crystal pins used as IO, then I tend to wack a crystal in with the 
two caps (it only adds au$1 to the product cost) and I am not making 
100's of these, most runs are bellow 20.

Regards,

Kat.