PA00: ADC: U_Bat
PA01: ADC: U_Solar
PA02: ADC: U_SW
PA03: ADC: I_Solar
PA04: ADC: I_Load
PA05: EXT_SCK
PA06: EXT_MISO
PA07: EXT_MOSI
PA08: Charge pump
PA09: EXT_SCL
PA10: EXT_SDA
PA11: Solar switch
PA12: Load switch
PA13: SWDIO
PA14: SWCLK
PA15: n.c.

PB0: LED A
PB1: LED B
PB3: LED C
PB4: n.c.
PB5: RS485 DE
PB6: RS485 TX
PB7: RS485 RX