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TDA7440 ACK problem

cnc_designer
Associate II

I made the circuit whose diagram is given on page 4 of the document in the link.

I am applying 9.1v to the circuit.

I can't get acknowledge to 0x88 address that I sent after start.

https://www.st.com/resource/en/datasheet/tda7440.pdf

I'm sure about the software part because, for example, if I send the address to the I2C oled display, I can receive an acknowledge.

Do you have any opinions about the acknowledgment problem? I think that the document belonging to Chip is very inadequate.

1 REPLY 1
cnc_designer
Associate II

My fault. I swapped the SCL and SDA pins.