I2C Problem with CY8C4745

[Yves]

Hi all,

after setting up a simple I2C slave device with address 0x3b, I have trouble on the I2C communication: the 9th clock edge, which is the ACK clock edge for the address byte, seems to be missing. I am using the CY8CKIT-148 with I2C on P1_0 & P1_1.

Creating the same simple code with a 4245 I don't see this problem, but the SCB block is managed differently for 42xx & 47xx. (just installed the SCB, configured I2C slave @ 100kbps and wrote the code from the datasheet example)

Here's a scope capture with 4745:

Ever seen this before? Any help would be welcome 🙂

Kind regards

[AlenAn14]

Hi @Yves ,

Can you please give us more details on the oscilloscope image that you shared above, like a more extended image of the same showing the data appearing after the image shared above?

Is it also possible for you to share any logs related to this that is generated by the scope we can open and analyze on our side?

Regards
Alen

[Yves · Accepted solution]

Hi Alen,

sorry, I have changed the code to use the EZI2C instead so I can't make more scope captures of this issue.

The good news however is that it works fine with EZI2C 🙂

This solution wouldn't be adapted to all cases but it works with my design

Kind regards

[AlenAn14]

Ok, @Yves,

We will check internally on this issue on our side as well.
Thank you for pointing this out.

Warm Regards
Alen