Other Parts Discussed in Thread: TPS62085
Hi there
I'm struggling very similar issue described here.
However, in my case 3 ICs are stacked giving 10 downstream ports at the end (first IC to MCU, one downstream port to upstream port of the second and so on).
SMBus is activated on all chips (with the unique addresses on each, 1k pull-ups). On PCB I can control power supply (enable/disable), where VDD11 if derive from VDD33 (via TPS62085).
The problem is I cannot communicate over SMBus. I've x-ray board to check if an issue is related to the one mentioned and the beginning.
Moreover if do a very short shortcircuits on VDD11 (like 100ms, TPS62085 is fine with this) chip gets unlocked!
In none SMBus mode IC works properly (tested separately, as polarisation on intermediate upstream ports needs to be change - that's why SMBus is in use).
Any idea?
As this is a prototype I get stucked:(