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Usage of the ADC for an alternate signal
Posted: Wed Jan 14, 2009 10:51 am
by markintosh
Hi all, I\'d like to use the ADC module of the FLex board to acquire a signal that presents a dinamic between -3 and +3 Volt, can I do it without an external conditioning circuit? If I can what are the pins to use and how to connect them?
thank you for the attention
Re:Usage of the ADC for an alternate signal
Posted: Wed Jan 14, 2009 12:44 pm
by paolo.gai
I think you\'ll need some conditioning circuit that brings the voltage you have in the range accepted by the MCU.
About the PINs to use, take a look at CON5 and CON6 pinouts (table 3.5 and 3.6 of the flex refman 1.01). They list the corresponding MCU pins connected to the connectors. You also may want to take a look at the MCU datasheet to see the possible settings of the A/D converter.
You can also take a look at the software already written for the FLEX Demo Board, in particular those described in section 4.5 (also the pin assignments are listed) of the manual \"Erika Enterprise Manual for dsPIC (R) DSC 30 family v. 1.1.8 \".
you can download those manuals at the documentation page:
http://www.evidence.eu.com/content/view/191/350/
bye
PJ