AN4658 Datasheet, PDF (1/24 Pages) STMicroelectronics – For more and more applications using STM32 products

AN4658
Application note
Migration of applications from STM32F429/439 lines
to STM32F446 line
Introduction
For more and more applications using STM32 products, it is important to easily migrate a
project to a different microcontroller in the same product family.
Migrating an application to a different microcontroller is needed, for instance, when product
requirements grow, putting extra demands on memory size, or requiring an increase in the
number of I/Os. On the other hand, cost reduction objectives may force to switch to cheaper
components and towards shrinking the PCB area.
This application note is intended to help the user to analyze the steps needed to migrate
from existing designs based on STM32F429xx and STM32F439xx products to
STM32F446xx devices. It groups together all the most important information and lists the
key items to address.
In this document the comparisons are carried out for “fully featured” microcontrollers of the
STM32F429/439 and STM32F446 lines, user must consider that some products may have
less features (depending on actual part number).
Migrating between two devices within the same family can require in some cases hardware
and/or software changes: the required ones are described in this document.
To benefit fully from the information in this application note, the user should be familiar with
the STM32 microcontroller family.
This application note has to be read in conjunction with STM32F429xx/STM32F439xx and
STM32F446xx reference manuals (RM0090 and RM0390, respectively) and datasheets
available at www.st.com.
Table 1. Applicable products
Product type
Product lines
Microcontrollers
STM32F429/439
STM32F446
March 2015
DocID027496 Rev 1
1/24
www.st.com
1