We have bought an PN532 NFC Shield since the NFC breakout board was not available from stock. Now we own the bord but have not got any documentation how to use it outside an Arduino stack.
The design seems to be different compared to the brealout board. We want to connect the board with an external microcontroller using the UART interface. By measuring we found that SEL0 must be open and SEL1 closed so that both configation bits become 0. But when we send a telegram to the PN532 we never get an acknowledge. Measuring showed that the signal lines SCL and SDA end at parts with SOT23 package and not at the PN532 as expected.
Can you please send as a schematic so that we are able to configure everything right for the UART interface?