INTERFACES

USB interface of AT91SAM7S256-MU is:
Pin 57, net name: USB-DP
Pin 56, net name: USB-DM
These connect to U9 (USBUF02W6) and finally to the USB-A plug and to pads P3 in parallel. This enables to use either a USB plug or solder wires to the PCB.


Serial interface of AT91SAM7S256-MU is:
Pin 24, net name: S7_RXD
Pin 25, net name: S7_TXD
These connect directly to pads P4 on the bottom of the PCB.



CHANGES

Add a footprint for an UF.L connector under the chip antenna.

When the UF.L is assembled, an external antenna is connected to the printed circuit board.

…

Add the contact pads P3 + P4. Connect contact pads P3 + P4 to the MCU as described above at "interfaces".

Do not place R16.


