Datasheet

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STM32F4DISCOVERY Hardware and layout

Doc ID 022256 Rev 2 23/38

PB4

NJTRST/

SPI3_MISO/

TIM3_CH1/

SPI1_MISO/

I2S3ext_SD

90

25

PB5

I2C1_SMBA/

CAN2_RX/

OTG_HS_ULPI_D7/

ETH_PPS_OUT/

TIM3_CH2/

SPI1_MOSI/

SPI3_MOSI/

DCMI_D10/

I2S3_SD

91

26

PB6

I2C1_SCL/

TIM4_CH1/

CAN2_TX/

OTG_FS_INTN/

DCMI_D5/

USART1_TX

92

SCL

23

PB7

I2C1_SDA/

FSMC_NL/

DCMI_VSYNC/

USART1_RX/

TIM4_CH2

93

24

PB8

TIM4_CH3/

SDIO_D4/

TIM10_CH1/

DCMI_D6/

OTG_FS_SCL/

ETH_MII_TXD3/

I2C1_SCL/

CAN1_RX

95

19

PB9

SPI2_NSS/

I2S2_WS/

TIM4_CH4/

TIM11_CH1/

OTG_FS_SDA/

SDIO_D5/

DCMI_D7/

I2C1_SDA/

CAN1_TX

96

SDA

20

Table 5. MCU pin description versus board function (page 4 of 10)

MCU pin Board function

Main

function

Alternate

functions

LQFP100

CS43L22

MP45DT02

LIS302DL

Pushbutton

LED

SWD

USB

OSC

Free I/O

Power supply

CN5

CN2

P1

P2