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I2C and BLE on the STM32WB05

nama
Associate II

‎2025-09-18 12:23 AM

Hi, all
I'm developing a BLE device using the STM32WB05 that supports I2C and BLE connections.

I successfully established an I2C connection using I2C_SCL(PB6) and I2C_SDA(PB7).
However, PB7 is used for RADIO_RF_ACTIVITY on BLE, causing a conflict between BLE and I2C.
Therefore, I tried changing to I2C_SCL(PA0) and I2C_SDA(PB14) to connect to the I2C master, but the connection failed.

I'm wondering if the I2C pins on the STM32WB0 are limited to only PB6 and PB7.

thanks.

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STTwo-32
ST Employee

‎2025-09-18 5:03 AM - edited ‎2025-09-18 5:03 AM

Hello @nama 

According to the table 6, table 7 and table 8 of the DS14591,  I2C1_SDA and I2C_SCL are available on PA0, PB6 for I2C1_SDA and PA1, PB7 for I2C_SCL. The PB14 is used for I2C1_SMBA signal.

Best Regards.

STTwo-32

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Andrew Neil
Super User

‎2025-09-18 5:16 AM

@nama wrote:

I successfully established an I2C connection using I2C_SCL(PB6) and I2C_SDA(PB7).

So you're using I2C1, then:

AndrewNeil_2-1758197737859.png

 

 

@nama wrote:

I tried changing to I2C_SCL(PA0) and I2C_SDA(PB14) .

As @STTwo-32 said, There is no I2C_SDA on PB14:

AndrewNeil_0-1758197680456.png

You need PA0 and PA1:

AndrewNeil_1-1758197711066.png

 

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.
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