## 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.   ### 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 |