Table 21. I2C Differences Between Stm32L1 Series And Stm32L4 Series - ST STM32L1 Series Application Note

Peripheral migration
4.13 I2C
The STM32L4 implements a different I2C peripheral allowing easy software management.
The table below shows the differences.

Table 21. I2C differences between STM32L1 Series and STM32L4 Series

I2C
Instances x2 (I2C1, I2C2)
Features
Configuration
Color key:
= New feature or new architecture (difference between STM32L1 and STM32L4 Series)
= Same feature, but specification change or enhancement
= Difference between STM32L1 and STM32L4 Series highlight
44/58
STM32L1 Series
7-bit and 10-bit addressing mode
SMBus
Standard mode (Sm, up to 100 kHz)
Fast mode (Fm, up to 400 kHz)
NA
-
DocID027094 Rev 3
STM32L4 Series
x3 (I2C1, I2C2, I2C3)
Fast mode Plus (Fm+, up to 1 MHz)
Independent clock
Wakeup from Stop on address match
Register configuration is very different in
STM32L1 and STM32L4 Series. Please refer to
STM32L4 Series reference manuals for details.
AN4612