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:
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Electrical Engineering Change Notes
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===================================
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Revision 0.1
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------------
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### Description
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First revision
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### Manufactured
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Boards ordered from Aisler on August 15th 2022.
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Sent directly the Kicad files. See r0.1/ directory.
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### Issues noticed
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* Missing I2C pull-ups on the isolated side.
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* The pinout for the external RJ45 is completely wrong.
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* The 1k across 12V dissipates 144 mW. It's above the rating for
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the jelly-bean 0603 resistors I originally used and it also
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gets quite warm.
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* The 120R termination resistors also can dissipate quite a bit
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of power. Technicaly up to 6V across leading to 300 mW !
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In our case, it's more like 3V so it's only 75 mW but still,
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some margin would be nice.
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* The linear 5V reg does heat up a bit. Nothing critical, but
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could be improved.
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### Notes
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* All boards have been reworked to fix most pressing issues :
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* 3k3 pullups added on the isolated side.
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* Cut & manually rewired the external RJ45 pinout.
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* 1k across 12V switched to high power 250mW part.
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* 120R termination switched to high power 250mW part.
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* Boards location:
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* One remained with tnt.
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* Two sent to LaF0rge. One will be installed in the datacenter
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to be used with the OCTOI hub, the other will remain for testing.
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Revision 0.2
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------------
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### Description
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Potential future version, if ever done ...
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### TODO
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* Add I2C pull ups on the isolated side.
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* Fix the external RJ45 pinout.
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* Use switchmode converter for supply. AP3211 looks like a good candidate.
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* Replace the 1k resistor across 12V with a resistor + zener + depletion n-mos
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so that it appears as 1k when supply is < ~4V but currents limit above that.
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* Use 0805 termination resistors maybe ? Or at least spec those as high power
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variants.
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Load Diff
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{
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"board": {
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"design_settings": {
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"defaults": {
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"board_outline_line_width": 0.09999999999999999,
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||||
"copper_line_width": 0.19999999999999998,
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"copper_text_italic": false,
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||||
"copper_text_size_h": 1.5,
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"copper_text_size_v": 1.5,
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"copper_text_thickness": 0.3,
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||||
"copper_text_upright": false,
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||||
"courtyard_line_width": 0.049999999999999996,
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"dimension_precision": 4,
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||||
"dimension_units": 3,
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||||
"dimensions": {
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||||
"arrow_length": 1270000,
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"extension_offset": 500000,
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"keep_text_aligned": true,
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"suppress_zeroes": false,
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"text_position": 0,
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"units_format": 1
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},
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"fab_line_width": 0.09999999999999999,
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"fab_text_italic": false,
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"fab_text_size_h": 1.0,
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"fab_text_size_v": 1.0,
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"fab_text_thickness": 0.15,
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"fab_text_upright": false,
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"other_line_width": 0.15,
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"other_text_italic": false,
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"other_text_size_h": 1.0,
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"other_text_size_v": 1.0,
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"other_text_thickness": 0.15,
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"other_text_upright": false,
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"pads": {
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"drill": 0.0,
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"height": 0.4,
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"width": 1.2
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},
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"silk_line_width": 0.15,
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"silk_text_italic": false,
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||||
"silk_text_size_h": 1.0,
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"silk_text_size_v": 1.0,
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"silk_text_thickness": 0.15,
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"silk_text_upright": false,
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"zones": {
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"45_degree_only": false,
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"min_clearance": 0.19999999999999998
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}
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},
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||||
"diff_pair_dimensions": [
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{
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"gap": 0.0,
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"via_gap": 0.0,
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"width": 0.0
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}
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],
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"drc_exclusions": [],
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"meta": {
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"version": 2
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},
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"rule_severities": {
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"annular_width": "error",
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||||
"clearance": "error",
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"copper_edge_clearance": "error",
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"courtyards_overlap": "error",
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"diff_pair_gap_out_of_range": "error",
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||||
"diff_pair_uncoupled_length_too_long": "error",
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||||
"drill_out_of_range": "error",
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"duplicate_footprints": "warning",
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"extra_footprint": "warning",
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"footprint_type_mismatch": "error",
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"hole_clearance": "error",
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"hole_near_hole": "error",
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"invalid_outline": "error",
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"item_on_disabled_layer": "error",
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"items_not_allowed": "error",
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"length_out_of_range": "error",
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"malformed_courtyard": "error",
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"microvia_drill_out_of_range": "error",
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"missing_courtyard": "ignore",
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"missing_footprint": "warning",
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"net_conflict": "warning",
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"npth_inside_courtyard": "ignore",
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"padstack": "error",
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"pth_inside_courtyard": "ignore",
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"shorting_items": "error",
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"silk_over_copper": "warning",
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"silk_overlap": "warning",
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"skew_out_of_range": "error",
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"through_hole_pad_without_hole": "error",
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"too_many_vias": "error",
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"track_dangling": "warning",
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"track_width": "error",
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"tracks_crossing": "error",
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"unconnected_items": "error",
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"unresolved_variable": "error",
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"via_dangling": "warning",
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"zone_has_empty_net": "error",
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"zones_intersect": "error"
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},
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"rules": {
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"allow_blind_buried_vias": false,
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"allow_microvias": false,
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"max_error": 0.005,
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"min_clearance": 0.0,
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"min_copper_edge_clearance": 0.0,
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"min_hole_clearance": 0.25,
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||||
"min_hole_to_hole": 0.25,
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"min_microvia_diameter": 0.19999999999999998,
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"min_microvia_drill": 0.09999999999999999,
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"min_silk_clearance": 0.0,
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||||
"min_through_hole_diameter": 0.3,
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"min_track_width": 0.19999999999999998,
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"min_via_annular_width": 0.049999999999999996,
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||||
"min_via_diameter": 0.39999999999999997,
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"solder_mask_clearance": 0.0,
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"solder_mask_min_width": 0.0,
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"use_height_for_length_calcs": true
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},
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"track_widths": [
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0.0,
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0.15,
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0.2,
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0.3,
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0.5,
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0.75,
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1.0
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],
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"via_dimensions": [
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{
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"diameter": 0.0,
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"drill": 0.0
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},
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{
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"diameter": 0.6,
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"drill": 0.3
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}
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],
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"zones_allow_external_fillets": false,
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"zones_use_no_outline": true
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},
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"layer_presets": []
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},
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"boards": [],
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"cvpcb": {
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"equivalence_files": []
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},
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"erc": {
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"erc_exclusions": [],
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||||
"meta": {
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||||
"version": 0
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||||
},
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"pin_map": [
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||||
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|
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|
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
2,
|
||||
2,
|
||||
2
|
||||
]
|
||||
],
|
||||
"rule_severities": {
|
||||
"bus_definition_conflict": "error",
|
||||
"bus_entry_needed": "error",
|
||||
"bus_label_syntax": "error",
|
||||
"bus_to_bus_conflict": "error",
|
||||
"bus_to_net_conflict": "error",
|
||||
"different_unit_footprint": "error",
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||||
"different_unit_net": "error",
|
||||
"duplicate_reference": "error",
|
||||
"duplicate_sheet_names": "error",
|
||||
"extra_units": "error",
|
||||
"global_label_dangling": "warning",
|
||||
"hier_label_mismatch": "error",
|
||||
"label_dangling": "error",
|
||||
"lib_symbol_issues": "warning",
|
||||
"multiple_net_names": "warning",
|
||||
"net_not_bus_member": "warning",
|
||||
"no_connect_connected": "warning",
|
||||
"no_connect_dangling": "warning",
|
||||
"pin_not_connected": "error",
|
||||
"pin_not_driven": "error",
|
||||
"pin_to_pin": "warning",
|
||||
"power_pin_not_driven": "error",
|
||||
"similar_labels": "warning",
|
||||
"unannotated": "error",
|
||||
"unit_value_mismatch": "error",
|
||||
"unresolved_variable": "error",
|
||||
"wire_dangling": "error"
|
||||
}
|
||||
},
|
||||
"libraries": {
|
||||
"pinned_footprint_libs": [],
|
||||
"pinned_symbol_libs": []
|
||||
},
|
||||
"meta": {
|
||||
"filename": "icE1usb-rs422.kicad_pro",
|
||||
"version": 1
|
||||
},
|
||||
"net_settings": {
|
||||
"classes": [
|
||||
{
|
||||
"bus_width": 12.0,
|
||||
"clearance": 0.15,
|
||||
"diff_pair_gap": 0.25,
|
||||
"diff_pair_via_gap": 0.25,
|
||||
"diff_pair_width": 0.2,
|
||||
"line_style": 0,
|
||||
"microvia_diameter": 0.3,
|
||||
"microvia_drill": 0.1,
|
||||
"name": "Default",
|
||||
"pcb_color": "rgba(0, 0, 0, 0.000)",
|
||||
"schematic_color": "rgba(0, 0, 0, 0.000)",
|
||||
"track_width": 0.15,
|
||||
"via_diameter": 0.6,
|
||||
"via_drill": 0.3,
|
||||
"wire_width": 6.0
|
||||
}
|
||||
],
|
||||
"meta": {
|
||||
"version": 2
|
||||
},
|
||||
"net_colors": null
|
||||
},
|
||||
"pcbnew": {
|
||||
"last_paths": {
|
||||
"gencad": "",
|
||||
"idf": "",
|
||||
"netlist": "",
|
||||
"specctra_dsn": "",
|
||||
"step": "",
|
||||
"vrml": ""
|
||||
},
|
||||
"page_layout_descr_file": ""
|
||||
},
|
||||
"schematic": {
|
||||
"annotate_start_num": 0,
|
||||
"drawing": {
|
||||
"default_line_thickness": 6.0,
|
||||
"default_text_size": 50.0,
|
||||
"field_names": [],
|
||||
"intersheets_ref_own_page": false,
|
||||
"intersheets_ref_prefix": "",
|
||||
"intersheets_ref_short": false,
|
||||
"intersheets_ref_show": false,
|
||||
"intersheets_ref_suffix": "",
|
||||
"junction_size_choice": 3,
|
||||
"label_size_ratio": 0.375,
|
||||
"pin_symbol_size": 25.0,
|
||||
"text_offset_ratio": 0.15
|
||||
},
|
||||
"legacy_lib_dir": "",
|
||||
"legacy_lib_list": [],
|
||||
"meta": {
|
||||
"version": 1
|
||||
},
|
||||
"net_format_name": "",
|
||||
"ngspice": {
|
||||
"fix_include_paths": true,
|
||||
"fix_passive_vals": false,
|
||||
"meta": {
|
||||
"version": 0
|
||||
},
|
||||
"model_mode": 0,
|
||||
"workbook_filename": ""
|
||||
},
|
||||
"page_layout_descr_file": "",
|
||||
"plot_directory": "./",
|
||||
"spice_adjust_passive_values": false,
|
||||
"spice_external_command": "spice \"%I\"",
|
||||
"subpart_first_id": 65,
|
||||
"subpart_id_separator": 0
|
||||
},
|
||||
"sheets": [
|
||||
[
|
||||
"e63e39d7-6ac0-4ffd-8aa3-1841a4541b55",
|
||||
""
|
||||
]
|
||||
],
|
||||
"text_variables": {}
|
||||
}
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File diff suppressed because it is too large
Load Diff
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(kicad_symbol_lib (version 20211014) (generator kicad_symbol_editor)
|
||||
(symbol "SP485" (in_bom yes) (on_board yes)
|
||||
(property "Reference" "U" (id 0) (at -6.096 11.43 0)
|
||||
(effects (font (size 1.27 1.27)))
|
||||
)
|
||||
(property "Value" "SP485" (id 1) (at 0.762 11.43 0)
|
||||
(effects (font (size 1.27 1.27)) (justify left))
|
||||
)
|
||||
(property "Footprint" "" (id 2) (at 0 -17.78 0)
|
||||
(effects (font (size 1.27 1.27)) hide)
|
||||
)
|
||||
(property "Datasheet" "https://assets.maxlinear.com/web/documents/sp483_sp485.pdf" (id 3) (at 0 1.27 0)
|
||||
(effects (font (size 1.27 1.27)) hide)
|
||||
)
|
||||
(property "ki_keywords" "rs485 rs422" (id 4) (at 0 0 0)
|
||||
(effects (font (size 1.27 1.27)) hide)
|
||||
)
|
||||
(property "ki_description" "Low Power Half-Duplex RS-485 Transceivers" (id 5) (at 0 0 0)
|
||||
(effects (font (size 1.27 1.27)) hide)
|
||||
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Binary file not shown.
|
@ -0,0 +1,3 @@
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|||
(sym_lib_table
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(lib (name "icE1usb-rs422")(type "KiCad")(uri "${KIPRJMOD}/icE1usb-rs422.kicad_sym")(options "")(descr ""))
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)
|
|
@ -0,0 +1,3 @@
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(sym_lib_table
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(lib (name "icE1usb-rs422")(type "KiCad")(uri "${KIPRJMOD}/icE1usb-rs422.kicad_sym")(options "")(descr ""))
|
||||
)
|
Loading…
Reference in New Issue