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.
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.
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.