track fab-step

.gitignore

+jake/
+**.elf
+**.hex
+**.bin
+**.lss
+**.map
+**.srec
+**.o
+**.d
+**.DS_Store
+**.b#*
+**.s#*
+**.l#*
+**.atsuo
+
+**/ASF/
\ No newline at end of file

README.md

+## Fab Stepper Driver
+
+### BOM 
+
+| Part | PN | Count |
+| --- | --- | --- |
+| SAMD21E18 | ‎ATSAMD21E18A-AU-ND‎ | 1 |
+| 3v3 Reg | ZLDO1117G33DICT-ND | 1 |
+| RS485 Tranciever | ISL3176EIBZ-ND | 1 | 
+| 2x5 Header | 1175-1621-ND‎ | 1 |
+| 2x5 JTAG | 1175-1629-ND or 609-3695-1-ND | 1 |
+| USB Micro B | 609-4613-1-ND | 
+| Reset Button | CKN10685CT-ND | 
+| 0.1uF 1206 | 399-C1206C104K5RAC7800CT-ND |
+| 1uF 1206 | 1276-3091-1-ND |
+| 10uF 1206 | 1276-6736-1-ND |
+| 0R 1206 | 541-4171-1-ND |
+| 100mOhm 1W 1206 | 2037-SCRR1206S1-R100FCT-ND |
+| 120R 1206 | 541-4193-1-ND |
+| 10k 1206 | 541-3983-1-ND |
+| LED 1206 | 160-1403-1-ND | 
+
+## Log 
+
+## 2020 11 05 
+
+Started in, have the schematic mostly roughed out: this'll be 1.5 sided (solid GND below a routed layer). I think... the largest challenge is just getting things around themselves without using any vias. Found a tranciever as well. 
+
+## 2020 11 16
+
+Just routed out the program / power / data interface side of this. 
+
+![routing](2020-11-16_routing.png)
+
+Success going forward will rely on a a fortuitous alignment of the RS485 interface pins against a SERCOM port somewhere on 11-16... not at all sure if any such alignment exists. 
+
+## 2020 11 17
+
+Lucky me, those line up. I can put the SERCOM's TXPO at 0 (for TX on SER-0) and and RXPO at 3 (for RX on SER-3) and the middle two will do data enable and rx enable, just GPIO. 
+
+![routing](2020-11-17_routing.png)
+
+So, sorted that out. I think it works OK. I can make one of these in the fab-version, and can copy the schematic onto a smaller 2-layer board to fab lots of at a board house, having pins 17-20 free for an AS5047 on the back... same RS485 interface, maybe the QFN D21, and 0805s or smaller passives, pinch traces / spaces etc. 
\ No newline at end of file

fab-step/eagle.epf

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