Feel like I'm missing something obvious on this one...
As part of a test setup for AD2437 system a 100 ohm load can be jumpered in to a node to simulate the actual application. With nominal VBus of 24V that's 240 mA and datasheet says 250 mA is the max allowed during discovery.
After some trial and error it seems like a VBUS load of > 10 mA (+/- a few mA) is enough to fault the discovery. Once discovery complete there's no issue with the 100 ohm (240 mA) load being connected. The node has a 100uF cap on the VBUS.<--- see reply that clarifies this and provides additional info
This is being run from SS+ 2.2.0 with 1.3.2 A2B plugin, the node is CFG4 RJ45 powered and SS+ is set to this.
I've tried this on multiple different sub nodes in different positions in the chain and issue seems consistent. I don't see any register(s) that set the startup current limit during discovery nor a way to read what the AD2437 thinks the current was? I tried enabling retries but that didn't change anything.
add note about 100uF cap
[edited by: Brewster at 1:43 PM (GMT -4) on 30 Sep 2024]