hardware/icE1usb-rs422: Initial import of RS422 extension HW

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: Ie878a1691fb18e288a21e139604b53b11cc95dad
This commit is contained in:
Sylvain Munaut 2022-09-13 10:31:44 +02:00
parent bdc41ffe73
commit 3e51deed3f
14 changed files with 41845 additions and 0 deletions

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Electrical Engineering Change Notes
===================================
Revision 0.1
------------
### Description
First revision
### Manufactured
Boards ordered from Aisler on August 15th 2022.
Sent directly the Kicad files. See r0.1/ directory.
### Issues noticed
* Missing I2C pull-ups on the isolated side.
* The pinout for the external RJ45 is completely wrong.
* The 1k across 12V dissipates 144 mW. It's above the rating for
the jelly-bean 0603 resistors I originally used and it also
gets quite warm.
* The 120R termination resistors also can dissipate quite a bit
of power. Technicaly up to 6V across leading to 300 mW !
In our case, it's more like 3V so it's only 75 mW but still,
some margin would be nice.
* The linear 5V reg does heat up a bit. Nothing critical, but
could be improved.
### Notes
* All boards have been reworked to fix most pressing issues :
* 3k3 pullups added on the isolated side.
* Cut & manually rewired the external RJ45 pinout.
* 1k across 12V switched to high power 250mW part.
* 120R termination switched to high power 250mW part.
* Boards location:
* One remained with tnt.
* Two sent to LaF0rge. One will be installed in the datacenter
to be used with the OCTOI hub, the other will remain for testing.
Revision 0.2
------------
### Description
Potential future version, if ever done ...
### TODO
* Add I2C pull ups on the isolated side.
* Fix the external RJ45 pinout.
* Use switchmode converter for supply. AP3211 looks like a good candidate.
* Replace the 1k resistor across 12V with a resistor + zener + depletion n-mos
so that it appears as 1k when supply is < ~4V but currents limit above that.
* Use 0805 termination resistors maybe ? Or at least spec those as high power
variants.

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View File

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View File

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