Connecting ILI9341 Display to STM32F446

Thought for 4 sec

I can’t modify the project right now because execution is unavailable in this session, and your current access to this project is view-only. Nothing has been changed in the schematic.

To connect this ILI9341 SPI TFT display module to an STM32F446, the likely wiring is:

Table

Display pin	STM32F446 connection
VCC	3.3 V, unless the module explicitly supports 5 V input
GND	GND
SCK / CLK	SPI SCK, e.g. PA5 / PB3
MOSI / SDI	SPI MOSI, e.g. PA7 / PB5
MISO / SDO	SPI MISO if used, e.g. PA6 / PB4
CS / TFT_CS	Any GPIO chip-select, e.g. PA4
DC / RS	Any GPIO, e.g. PB0
RESET / RST	Any GPIO or MCU reset through suitable circuit, e.g. PB1
LED / BL	3.3 V through current control, or GPIO/PWM via transistor if backlight current is high
SD_CS	Separate GPIO chip-select if using SD card
SD_MOSI	Same SPI MOSI
SD_MISO	Same SPI MISO
SD_SCK	Same SPI SCK

Important design notes:

Use 3.3 V logic with STM32F446. Do not drive the display with 5 V logic unless the module has level shifting.
TFT and SD card can share SPI SCK/MOSI/MISO, but they need separate CS pins.
Add local decoupling near the display connector: at least 100 nF plus 4.7–10 µF across VCC/GND.
If the backlight pin draws more than a few mA, drive it with a MOSFET or BJT instead of directly from an STM32 GPIO.
Confirm whether your display module has an onboard 3.3 V regulator and level shifters before tying VCC to 5 V.

To proceed with actual schematic wiring, I’d need edit access to the project and confirmation of the exact STM32F446 part or board you want to use, for example STM32F446RE, STM32F446ZE, or a Nucleo/Discovery board.

Use F446RE SPI1

Display connector wiring

Check display specs

Add support circuitry

FLASH_CD

LED

SD_MISO

SD_CS

D/~{C}

~{CS}

GND

RESET

VCC

SD_SCK

MOSI

MISO

SCK

SD_MOSI

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