Hi Sir,
Could you please help me to check that the trigger signal of PCA9548A?
If I wish to switch the mux to channel 5 (0x20), as Pic A and Pic B show.
Could you please help to verify both PicA & B are both switch well?
In my test result, Pic A may get some problem that can not switch successfully.
Does it have some restrict of protocol type?
PicA
PicB
Hi Bobby,
Here is zoom-in waveform as attachment.
Customer is doing more test today and the result as below.
As Pic A and Pic B show that we use two kinds of BMC polling form.
One is Write + Read and the other is Write.
As our result shows that, form “Write” could be work on PCA9548APW, but form “Write + Read” would not work.
Interesting that the form of “Write + Read ” can work at another 9548 from another vendor.
Is there any restrict about polling type ?
Pic A not work– BMC polling form : Write + Read
Pic B work well – BMC polling form : Write
Hello,
It looks like the issue is that you are not issuing a stop condition after you perform a write.
Our device requires a stop condition after the write inorder to execute the command of enabling/disabling channels.
-Bobby
