Pin # IC Pin Default Alt   GPIO Note
N1   3V3       Power In Vcc
N2 PC0 SDA1 GPIO   64 I2C bus 1 Data or GPIO
N3 PC1 SCL1 GPIO   65 I2C bus 1 Clock or GPIO
N4 PC2 GPIO     66  
N5 PC3 GPIO     67  
N6 PC4 GPIO     68  
N7 PC5 GPIO     69  
N8 PC6 GPIO     70  
N9 PC7 GPIO     71  
N10 PC8 UTXD0 GPIO   72 UART0: /dev/ttyS5 TXD
N11 PC9 URXD0 GPIO   73 UART0: /dev/ttyS5 RXD
N12 PC10 GPIO     74  
N13 PC11 GPIO     75  
N14 PC12 GPIO     76  
N15 PC13 GPIO     77  
N16 PC14 GPIO     78  
N17 PC15 GPIO     79  
N18 PC16 UTXD1 GPIO   80 UART1: /dev/ttyS6 TXD
N19 PC17 URXD1 GPIO   81 UART1: /dev/ttyS6 TXD
N20 PC18 GPIO PWM0   82 GPIO or Pulse Wave Modulation Out 0
N21 PC19 GPIO PWM1   83 GPIO or Pulse Wave Modulation Out 1
N22 PC20 GPIO PWM2   84 GPIO or Pulse Wave Modulation Out 2
N23 PC21 GPIO PWM3   85 GPIO or Pulse Wave Modulation Out 3
N24   GND       Power In GND
Pin # IC Pin Default Alt   GPIO Note
E1   GND       Power In GND
E2 PC22 TXD3 GPIO   86 USART3: /dev/ttyS4 TXD
E3 PC23 RXD3 GPIO   87 USART3: /dev/ttyS4 RXD
E4 PC24 RTS3 GPIO   88 USART3: /dev/ttyS4 RTS 
E5 PC25 CTS3 GPIO   89 USART3: /dev/ttyS4 CTS 
E6 PC26 GPIO     90  
E7 PC27 RTS1 GPIO   91 USART1: /dev/ttyS2 RTS
E8 PC28 CTS1 GPIO   92 USART1: /dev/ttyS2 CTS
E9 PC29 GPIO     93  
E10 PC30 GPIO     94  
E11 PC31 GPIO     95  
E12 USBCP D+       USB 2.0 Host full-speed port C
E13 USBCN D-       USB 2.0 Host full-speed port C
E14   GND       Power In GND
E15 USBBN D-       USB 2.0 Host hi-speed port B
E16 USBBP D+       USB 2.0 Host hi-speed port B
E17   GND       Power In GND
E18 USBAN D-       USB 2.0 Host/Device hi-speed port A
E19 USBAP D+       USB 2.0 Host/Device hi-speed port A
E20 VBAT         RTC battery backup +3 volt DC input
E21 NRST         Reset input signal (active low)
E22 SHDN         Shutdown output signal (active low)
E23 WKUP         Wake-up input signal (active low)
E24   3V3       Power In Vcc
Pin # IC Pin Default Alt   GPIO Note
S1   3V3       Power In Vcc
S2 PA21 1W GPIO   21 Bit banging 1-wire bus or GPIO
S3 PA20 DA3     20 microSD Card memory
S4 PA19 DA2     19 microSD Card memory
S5 PA18 DA1     18 microSD Card memory
S6 PA17 CK     17 microSD Card memory
S7 PA16 CDA     16 microSD Card memory
S8 PA15 DA0     15 microSD Card memory
S9 PA14 NPCS0 GPIO   14 SPI bus 0 chip select 0 or GPIO
S10 PA13 SPCK GPIO   13 SPI bus 0 clock or GPIO
S11 PA12 MOSI GPIO   12 SPI bus 0 Master Output or GPIO
S12 PA11 MISO GPIO   11 SPI bus 0 Master Input or GPIO
S13 PA10 DTXD     10 Debug serial port
S14 PA9 DRXD     9 Debug serial port
S15 PA8 RXD2 GPIO   8 USART2:  /dev/ttyS3 RXD or GPIO
S16 PA7 TXD2 GPIO   7 USART2:  /dev/ttyS3 TXD or GPIO
S17 PA6 RXD1 GPIO   6 USART2: /dev/ttyS2 RXD or GPIO
S18 PA5 TXD1 GPIO   5 USART2: /dev/ttyS2 TXD or GPIO
S19 PA4 GPIO     4  
S20 PA3 CTS0 GPIO   3 USART1: /dev/ttyS1 CTS or GPIO
S21 PA2 RTS0 GPIO   2 USART1: /dev/ttyS1 RTS or GPIO
S22 PA1 RXD0 GPIO   1 USART1: /dev/ttyS1 RXD or GPIO
S23 PA0 TXD0 GPIO   0 USART1: /dev/ttyS1 TXD or GPIO
S24   GND       Power In GND
Pin # IC Pin Default Alt   GPIO Note
W1   GND       Power In GND
W2   ETHRXP       Eth RX+
W3   ETHRXN       Eth RX-
W4   ETHTXP       Eth TX+
W5   ETHTXN       Eth TX-
W6   ETH3V3       Eth 3V3
W7   ETHLED1       Eth Yellow led (traffic)
W8   ETHLED2       Eth Green led (link)
W9 PA22 GPIO     22  
W10 PA23 GPIO     23  
W11 PA24 GPIO     24  
W12 PA25 GPIO     25  
W13 PA26 GPIO     26  
W14 PA27 GPIO     27  
W15 PA28 GPIO     28  
W16 PA29 GPIO     29  
W17 PA30 SDA0 GPIO   30 I2C bus 0 Data or GPIO
W18 PA31 SCL0 GPIO   31 I2C bus 0 Clock or GPIO
W19 ADVREF         A/D converter voltage reference In (max 3.3 volt)
W20 PB11 AD0 GPIO   43 A/D converter Input 0 or GPIO
W21 PB12 AD1 GPIO   44 A/D converter Input 1 or GPIO
W22 PB13 AD2 GPIO   45 A/D converter Input 2 or GPIO
W23 PB14 AD3 GPIO   46 A/D converter Input 3 or GPIO
W24   3V3       Power In Vcc

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