(2024-03-21, 06:32 PM)Sully Wrote: [ -> ]Do you think if I connected the 12V SW in the CAN socket (which is externally identical) I would have fried the raspi?
Interesting thought. I assumed that the CAN driver can withstand 12V as the recommended ESD protection diodes have a working voltage of 24V. And the datasheet of the MCP2562 lists +/- 58V as absolute maximum on the CANH/CANL pins.
But I will have to try that on a sacrificial MacArthur prototype.
Can you take a close look at two parts on your MacArthur HAT?
- U3 CAN Driver: Do you see a small crater or an area that's bubbled up?
- D22 ESD protection diode: Is the part damaged?
The attached images are from a MacArthur prototype where 12V was accidentally plugged into the 1-Wire connector.
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attachment=2742]
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attachment=2743]
We tried to prevent that mistake by having a different color for the power connector and plug, but I can see how that can still happen by accident. Maybe we should migrate to a different type for power that doesn't fit into the other connectors.
(2024-03-23, 12:36 AM)Adrian Wrote: [ -> ]Can you take a close look at two parts on your MacArthur HAT?
- U3 CAN Driver: Do you see a small crater or an area that's bubbled up?
- D22 ESD protection diode: Is the part damaged?
The attached images are from a MacArthur prototype where 12V was accidentally plugged into the 1-Wire connector.
We tried to prevent that mistake by having a different color for the power connector and plug, but I can see how that can still happen by accident. Maybe we should migrate to a different type for power that doesn't fit into the other connectors.
Hi Adrian.
Thank you for your response. I don't see any of those effects on the HAT. In fact, I bought another rpi5 and it works perfectly fine with the HAT. So maybe it doesn't have anything to do with the first rpi death?
I don't really know what happened.
Thank you.