- Ask a related questionWhat is a related question?A related question is a question created from another question. When the related question is created, it will be automatically linked to the original question.
Hello E2E-Forum,
im trying to connect a TCA6424A over the IO-Expander EVM-Module but have not jet any success on it. The host µC is a S32K146 and im using the LPI2C0 of it.
What i did:
- Pulled the ADDR_24 Pin on J2 Pin 10 low against the onboard GND-Pin J7
- Provided 5V from my target hardware as well as GND
- Played arround with SCL-Clock frequency (stayed now < 100kHz)
- Adopted the Start/Stop-Settings so meet the TCA6424A timings with more time reserve
- Set address to 0x22 for TCA6424A communication
- I did not changed the 4k7 pullups of the EVM-Board
As im able to provide some skope snips you can see the I2C-Bus looks fine to me but i get no ACK of the device. 
Is my suggestion right that it should be all right with this frame? My controller gets stucked and does not transfer any further data as there is no ACK on the SDA-Line.
Maybe the IC on the EVM is broken? Im running out of ideas :(
