| Pin number | Pin name | Pin direction | Pin usage |
| 1 | GND | output | Ground wire, connected to the power reference ground |
| 2 | GND | output | Ground wire, connected to the power reference ground |
| 3 | GND | output | Ground wire, connected to the power reference ground |
| 4 | GND | output | Ground wire, connected to the power reference ground |
| 5 | PD07 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 6 | PD06 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 7 | PD05 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 8 | PD04 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 9 | PD03 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 10 | PD02 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| - | PD01 | - | Undrawn, connected 32. 768KHz crystal oscillator as LFXTAL_I inside the module (see EFR32FG25 manual) |
| - | PDOO | - | Undrawn, connected 32. 768KHz crystal oscillator as LFXTAL_0 inside the module (see EFR32FG25 manual) |
| 11 | GND | output | Ground wire, connected to the power reference ground |
| 12 | +5V | input | Power input +5V |
| 13 | +5V | input | Power input +5V |
| 14 | PCOO | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 15 | PC01 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 16 | PC02 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 17 | PC03 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 18 | PC04 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 19 | PC05 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 20 | PC06 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 21 | PC07 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 22 | PC08 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 23 | PC09 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 24 | PC10 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 25 | NRST | output | Chip reset triggers input pin, low level active |
| 26 | GND | output | Ground wire, connected to the power reference ground |
| 27 | GND | output | Ground wire, connected to the power reference ground |
| 28 | GND | output | Ground wire, connected to the power reference ground |
| 29 | ANT | output | Antenna interface, stamp hole (50Q characteristic impedance), connected to the IPEX-1 interface |
| 30 | GND | output | Ground wire, connected to the power reference ground |
| 31 | GND | output | Ground wire, connected to the power reference ground |
| 32 | GND | output | Ground wire, connected to the power reference ground |
| 33 | GND | output | Ground wire, connected to the power reference ground |
| 34 | PB05 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 35 | PB04 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 36 | PB03 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 37 | PB02 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 39 | PBOO | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 40 | GND | output | Ground wire, connected to the power reference ground |
| 41 | PAOO | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 42 | PA01 | input/output | Program debugging/download port SWCLK |
| 43 | PA02 | input/output | Program debugging/download port SWDIO |
| 44 | PA03 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 45 | PA04 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 46 | PA05 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 47 | PA06 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 48 | PA07 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 49 | PAOS | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 50 | PA09 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 51 | PA10 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |
| 52 | PA11 | input/output | Configurable generic 10 ports (see EFR32FG25 manual) |