STM32F469 datasheet(40/91 Pages) STMICROELECTRONICS

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Creating a graphical application with LTDC

AN4861

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DocID029237 Rev 2

When selecting a display panel, the user should:

•

Ensure that the display interface is compatible with the LTDC (parallel RGB with control

signals).

•

Check if the control signals can be controlled by the LTDC (additional GPIOs are

sometimes needed).

•

Ensure that the display signal levels are matching the LTDC interface signal levels

(VDD from 1.8 V to 3.6 V).

•

Ensure that the display’s pixel clock is supported by the LTDC maximum pixel clock

defined in ithe relevant STM32 microcontroller datasheet.

•

Verify that the display timings parameters are supported by the LTDC timings (see

Table 6: LTDC timing registers).

•

Check that the display’s size and color depth are supported by the LTDC (refer to

Section 4.2.2: Checking display compatibility considering the memory bandwidth

requirements).

4.3

STM32 package selection guide

At this stage of the graphical application development, the user has already determined the

application’s requirements in terms of GPIOs:

•

Whether an external memory is needed and which is the bus width.

•

Which LTDC configuration to use: RGB565, RGB666 or RGB888.

When selecting the STM32 package, the user has to consider the RGB interfaces

availability and the application requirements in terms of GPIOs number. The user must refer

to the STM32 relevant datasheet to get the available packages with GPIOs.

An easy way to check if the STM32 package in which the user is interested matches the

application needs in term of GPIO number, is to use STM32CubeMX (the pinout tab).

Table 13 summarizes the available packages and RGB interface of STM32 MCUs

embedding an LTDC.

Table 13. STM32 packages with LTDC peripheral versus

RGB interface availability(1)

Product

STM32F429

SRM32F439

STM32F469

STM32F479(2)

STM32F7x6

STM32F7x7

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