About processing of unused pins in PN532

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About processing of unused pins in PN532

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sakai
Contributor I

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

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weidong_sun
NXP TechSupport
NXP TechSupport

Hello 利幸 酒井 ,

1. PIN2---LOADMOD

Accroding to datasheet, Fig 51. Application diagram of PN532,

pastedImage_1.png

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.

4. PIN27,28,29,30

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.

Regards,

Weidong

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weidong_sun
NXP TechSupport
NXP TechSupport

Hello 利幸 酒井 ,

1. PIN2---LOADMOD

Accroding to datasheet, Fig 51. Application diagram of PN532,

pastedImage_1.png

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.

4. PIN27,28,29,30

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.

Regards,

Weidong

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