Q: What are TX, RX, GND, TEST contact pads on FGPMMOUDG?
The module FGPMMOUDG has some undocumented contact pads:
- TX
- RX
- GND
- TEST
It is not possible to access the Rx/Tx pins (TTL level) from the module or the chip.
The TEST pin is for GlobalTop internal testing purposes only, hence is not open for public use.
The USB DonGle (UDG) only uses D+/D- differential level for data transferring (no TTL here).
