The Terminal Block Featherwing doesn't have any active components. Instead, it just breaks out all the existing connections from a Feather. Note that Feathers use different chipsets so not all pins are labeled on purpose!
The only pins you can depend on are:
- 3.3V power
- 3.3V enable
- VBat power
- USB power
- GND
- Reset
- I2C: SDA & SCL
- SPI: MOSI, MISO, SCK
- UART: RX & TX
Check your Feather documentation and product page for details on what other pins are available and what they are connected to
