Part Number: TCA9511A
Hi Experts,
My customer is using TCA9511 + F280039(slave) combination for I2C interface, they are seeing an unexpected fake clock on the SCL line, which is possibly a result of RTA mis-trigger.
This issue happens when master send the address to F280039 to request a read. The address has matched the one in the F280039 so the F280039 should send a ACK to inform the master,
Below is the waveform:
For better illustration, here's the same picture without any marking
Our theory is the RTA is mis-triggered. Since TCA9511 already states the risk of RTA mis-triggering, when the Vol is too high (in this case, the low level onput of TCA9511 is 0.68V), customer should consider lowering the Vol.
However, The TCA9511 is on the end-user board, not the customer board, so they can only suggest the end user to decrease the Vol. Before they gives the suggestion, they want to comfirm that if this is the result of RTA, and if droping the Vol to 0.6 (or other recommend threshold) can solve the issue.
Could you please comfiming the below item?
- Is this a behaviour of RTA casuing the false rising edge?
- If the end-user decrease the Vol to below 0.6V (or other recommend threshold), can it make sure that the RTA won't be triggered?
Regards,
Hang
