Is there an application note available on how to implement a card detection circuit using the pn512 and an adc from a mcu?
You can find some documentation and examples for PN512 chip on the NXP NFC Reader Library that is available here: http://www.nxp.com/products/identification-and-security/nfc-and-reader-ics/nfc-frontend-solutions/nfc-reader-library-software-support-for-nfc-frontend-solutions:NFC-READER-LIBRARY?tab=In-Depth_Tab
NFC Reader Library|NXP
After downloading the package and installing it, you can check documentation located at:
And some examples codes here: <NXP_NFC_READER_LIBRARY_PN512_PATH>/Reader_Library/PNEV512B-LPC1769-LPC11U68_NFC-Reader-Library-v4.010.03.001609/
I hope this can help you!
Have a nice day!
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