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Interfacing a PIC 18F452 and an ADC AD7827 + SPI com

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french_student

New Member
Hello,

I need to interface a PIC 18F452 with an external ADC, the AD7827 wich is an 8-bit ADC with serial interface. I want to establish the communication between the PIC and the ADC with the PIC's SPI module. But I have a problem. In fact i'd need to have the clock signal output working more than 8 times (not only when the PIC reads the value on his SDI pin), because my ADC need it to realise the conversion and serialization. I read the PIC datasheet, but i stille don't know if i could that: how can i send the SCK signal to the ADC more than 8 times so how can i send this signal even if i don't read the value on the SDI pin?

I hope my question is clear enough.
Thanks for your answers.
 

ivancho

New Member
Why don't yo use the ADC in the PIC, it will convert faster and you will have less hardware to take care of. :wink:

Ivancho
 

french_student

New Member
Thanks for your answer

But the reason why i don't use the ADC in the pic is that it's too slow! The conversion time is really too slow for the applications i need to do.

So if you have any other idea, it will be great!!

Thanks.
 
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