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## D51 Module, Round Two
For mixed volume production of various network endpoints / routers, this board is the collected set of boilerplate utilities need to boot and use the ATSAMD51:
- JTAG Programming Header (SWD Pins)
- Reset Switch
- 5v in -> local 3v3 reg
- Bypass Caps
- 32kHz Xtal
- 16MHz Xtal
- LEDS: Power, Clock, Error
- USB Connector
- RS485 PHY w/ DE, RE, and Logic-Selectable Termination Resistor
- DIP Switch for local configuration, i.e. bus-drop-address
- SAMD51
Most of the other D51 pins are broken out on 0.05" spaced castellated pins. The module is about as tiny as I could flex it, 20.3 x 28.6mm. The notion is to make *lots* of these, and solder them on to more ad-hoc driver boards.
**V02**
I updated this module to break out the 5th SERCOM, so I could ostensibly use *all* of them in a circuit. I also routed the debug lights that I had forgotten about (whoops) and swapped from a surface mount programming header to a thru-hole, not soldered on by default, but a 'lock' header pattern, hopefully it will just touch-and-program pretty well.
70 of these are on the way.
**V01**
### Part Numbers
| Part | Identifier | Digikey PN |
| --- | --- | --- |
| RS485 Driver | --- | MAX13450EAUD+-ND |
| Screw Terminal | --- | 277-1860-ND |
| DIP Switch | --- | CT3111-ND |
| XTAL 32KHz | --- | XC1617CT-ND |
| XTAL 16MHz | --- | SER4046CT-ND |
| 0402 LED Red | D2 | 516-3060-1-ND |
| 0402 LED Green | D3, D4 | 516-3066-1-ND |
| JTAG Program Header | J2 *was err specd as 1175-1629-ND* | 609-3695-1-ND |