Hardware migration

AN4617

4/26

DocID027161 Rev 1

1

Hardware migration

Basically the STM32F0 and STM32L0 series are pin-to-pin compatible and directly

replaceable.

All peripherals share most of the pins, but there are some minor differences between

packages. When performing the migration, user can gain or lose some GPIOs, and some

power supply pins can become incompatible, so a careful check of pinouts has to be carried

out.

Differences can appear at handling BOOT0 pin, as this pin can be provided optionally

according to internal option bits. Standard OSC pin can be replaced by OSC32 for some

small packages. Some products feature the NPOR pin, too.

The possible impacted pins are summarized in Table 2.

PF0-OSC_IN

PC14-OSC32_IN

3

-

-

-

PF1-OSC_OUT

PC15-OSC32_OUT

-

5

5

-

PF0-OSC_IN

PH0-OSC_IN

6

6

PF1-OSC_OUT

PH1-OSC_OUT

PF9

PH9

-

-

-

11

PF10

PH10

17

-

-

-

VDDIO2

VDD

-

-

-

18

PF2

VSSA

-

-

-

19

VSSA

VREF-

-

-

18

-

PF4/VSS

VSS

-

-

19

-

PF5/VDD

VDD

-

-

-

20

VDDA

VREF+

-

-

-

21

PF3

VDDA

-

20

28

-

PB2/NPOR

PB2

-

35

47

-

PF6/VSS

VSS

-

-

-

73

PF6

VDD

-

36

48

75

VDD / VDD_USB(1)

31

44

60

-

BOOT0/PF11-BOOT0/PB8

BOOT0

Table 2. STM32F0 series and STM32L0 series pinout differences

Package LQFP

STM32F0 series

STM32L0 series

32 pin

48 pin

64 pin

100 pin

-

1

1

6

VBAT/VDD

VDD/VLCD

2

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--

-

10

1. When power supply is applied at its pin, it powers USB, PA8-15, PC6-12 and PD2 for the F0 family, USB,

and USB associated pins PA11 and PA12 for the L0 family.