00:08 <GenTooMan> set_, their is a global semiconductor shortage you can thank the automotive manufacturers are crypto miners for that fiasco.

00:40 <set_> Okay...I knew something was iffy.

01:03 <set_> auto makers and their chip selection. Barf. No wonder a new GMC costs the price of a porche.

01:03 <set_> Argh!

20:29 <Guest89> Hello

20:32 <Guest89> I am making a can bus shield for pocket beagle, and I was thinking of powering the shield using the 3.3 out from the pocket. Does the pocketbeagle already has overcurrent protections or should add something like tvs diodes and resettable fuses?

21:25 <zmatt> Guest89: you mean to protect against short-circuit of the can bus? isn't that normally the responsibility of the can transceiver?

21:25 <Guest89> yeah, but I wanted to add another level, just in case

21:30 <Guest89> it's for a college project, so I need to add extra failsafes

21:31 <zmatt> I'd add those on the bus side if needed, not the supply side

21:33 <zmatt> the problem is that if the supply to the transceiver drops to a low voltage as a result of a protection circuit, then now you're effectingly short-circuiting the CAN_TX output of the processor, which is worse

21:35 <Guest89> so I just power sn65 with 3.3v from pocket without extra protection circuit?

21:35 <zmatt> (at least, that will probably happen, if the transceiver has clamping diodes on its I/O, which is typical)

21:35 <zmatt> sn65 ?

21:36 <Guest89> SN65HVD230 transceiver

21:41 <zmatt> its driver is limited to -40..+48 mA so overcurrent protection is kind of pointless, though it seems to have limited overvoltage protection on the bus side so it may benefit from some additional protection there