Datasheet

Hey wait ... isn't there something funny with the SVDD pin?

Indeed, good eye! Unfortunately, both v1.0 and v1.3 of the breakout boards have a problem on the schematic.

SVDD is connected directly to VDD, but should be left floating since it is used to power secure modules. This has no

effect on the functionality of the boards, but does cause some extra current to be drawn. It will be fixed on the next

revision of the board, but if you require the use of the secure modules (rare), you can simply cut the trace to the left

of C22, which is the cap connected to SVDD (just follow the trace straight up from pin 37).

Are there any special requirements to use the PN532 Breakout with the Due?

While the libraries do not officially support the Due yet, some customers have been able to get them working with

some minor changes to the library.

We recommend using the I2C libraries with both the shield and the breakout boards since the I2C library represents

the latest code from Adafruit, and the shield version should work without too much effort.

There is one caveat combining the breakout, I2C and the Due, though: The Due includes pullup resistors for I2C0

(SCL0 and SDA1), but there are no pullups resistors on SCL1 and SDA1. SCL1/SDA1 are the pins used as

replacements for the Uno I2C pins (the pins used on standard shields), so you will need to add two 1.5K pullups on

SCL1 and SDA1 to use the breakout board with I2C1 and the Due. Simply solder two 1.5K resistors, one from SCL1 to

3V3 and another from SDA1 to 3.3V, and then connect the board the same way you would with an Uno.

This issue only applies to the PN532 Breakout board since the PN532 shield includes I2C pullup resistors right on

board.