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fab-step

Jake Read's avatar
Jake Read authored
94cb814b
History

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

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

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.