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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. 
    
    ![routed](log/2020-06-29_routed.png)
    ![schem](log/2020-06-29_schematic.png)
    
    ### 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 | --- | 1175-1629-ND |
    | Reset Switch | --- | CKN10685CT-ND |
    | D51 | --- | ATSAMD51J19A-MUTCT-ND |
    | 3v3 600mA VREG | --- | AP2112K-3.3TRG1DIDKR-ND |
    | USB Micro Plug | --- | 609-4613-1-ND |