- GND
- Ground
- 5V
- 5V Power Input (connected to USB VBUS)
- BOOT
- GPIO09, Input
- GPIO08
- Input/Output, High Impedance
- GPIO04
- Input/Output, High Impedance
- GPIO05
- Input/Output, High Impedance
- 3.3V
- Chip Power Supply
- GPIO11
- Input/Output, High Impedance
- GPIO07
- Input/Output, High Impedance
- GPIO06
- Input/Output, High Impedance
- GPIO10
- Input/Output, High Impedance
- GPIO03
- Input/Output, High Impedance
- GPIO02
- Input/Output, High Impedance
- RESET
- Chip Reset
- NC
- Not Connected
- GPIO13
- Input/Output, High Impedance
- GPIO20 (U0_RX)
- Input/Output, High Impedance
- GPIO21 (U0_TX)
- Input/Output, High Impedance
- GPIO19
- Input/Output, High Impedance
- GPIO18
- Input/Output, High Impedance
- GPIO12
- Input/Output, High Impedance
- GPIO01
- Input/Output, High Impedance
- GPIO00
- Input/Output, High Impedance
- Chip 3.3V Power Control (PWB)
- Active High, can be left floating if unused