I am designing NFC product using PN532.
There are some unused pins.
Could you tell me the processing of un used pins?
Unsed pins are below.
2 , 12 ,13 , 24 , 29 ~ 37
Hello 利幸 酒井 ,
Accroding to datasheet, Fig 51. Application diagram of PN532,
This part of circuit is optional, so LOADMOD signal can be floating.
2. PIN12---AUX1 ; PIN13---AUX2
These 2 PIN should be connected Test Points.
3. PIN24---UART_RX ; PIN31---UART_TX
These 2 PINs are signal for debug UART.
-- PIN24 should be connected to GND or pull it up to High with 4.7K/10K resistor.
---PIN31 can be floating.
These 4 PINs are signal for Host Interface: SPI / i2c / High Speed UART. I don't kown if you don't use them, how will you run software for PN532? because it means you don't want to use MCU or processor.
----Input signals should be connected to GND or pull it up to High with 4.7K/10K resistor.
---output signals can be floating.
5. PIN32 & PIN33
These 2 PINs are both interrupt sources, used send interrupt to MCU.they can also be floating if you don't need them, but are you really sure you don't need them?
6. PIN34 ~ PIN37
This is interface for Secure IC, if you don't need them, PIN37(SVDD) can be conntected a 0.1uF capacitor close to PN532, PIN36 should be connected to GND or pull it up to High with 4.7K/10K resistor, other 2 PINs can be floating.
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