STM32WLE5CCU7 I2C Not Working

[VIGNESH_KUMAR_M]

Hi,

Currently, we are working on the IO-EXPANDER (PCA9505DGGY) via I2C communication. We are using Standard mode (100 kHz).

Whenever we try to communicate with the slave device, the SDA line remains idle, and I can only see three clock pulses on the SCL line at all times. Please refer to the attached image for the SCL reference.

Note: In the image, the line markup name is incorrect—it is labeled as SDA, but it is actually SCL.

[Roger SHIVELY]

Hello @VIGNESH_KUMAR_M 

This post has been escalated to the ST Online Support Team for additional assistance.  We'll contact you directly.

Regards,

Roger