January 2015

DocID027299 Rev 1

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TN1201

Technical note

Migrating from STM32L15/6xxD to STM32L15/6xVD-X

Introduction

To ease the development of STM32 microcontroller applications, it is important to be able to

smoothly replace one microcontroller type with another from the same product family. The

purpose of this technical note is to help users with the migration from an STM32L15/6xxD

(348KB Flash and 48KB RAM) device to an STM32L15/6xVD-X (384KB Flash and 80KB

RAM) device. This document includes the relevant information for users.

Prior to migrating an application, the users need to analyze the hardware migration, the

peripheral migration and the firmware migration. To better understand the information

included in this technical note, the users should be familiar with the STM32L1

microcontroller family.

For additional information, please refer to the STM32L100xx, STM32L151xx, STM32L152xx

which STM32L15/6xxD is ‘Cat.4’ device, STM32L15/6xVD-X is ‘Cat.5’ device, and to the

STM32L15/6xxD, STM32L15/6xVD-X datasheets. Documents are available for download

from the company website at www.st.com/stm32.

Table 1 lists the STM32 microcontrollers concerned by this technical note.

Table 1. Applicable products

Type

Part numbers

Microcontrollers

STM32L151QD, STM32L151RD, STM32L151VD, STM32L151ZD,

STM32L152QD, STM32L152RD, STM32L152VD, STM32L152ZD,

STM32L162QD, STM32L162RD, STM32L162VD, STM32L162ZD,

STM32L151VD-X, STM32L152VD-X, STM32L162VD-X

www.st.com