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diff --git a/pcb/README.md b/pcb/README.md new file mode 100644 index 0000000..a4c83fb --- /dev/null +++ b/pcb/README.md @@ -0,0 +1,20 @@ +# PCB files +This folder contains the schematic and gerber files to produce your own modchip PCB. +We ordered our modchip PCB from JLCPCB and selected a PCB thickness of 0.8mm, 1.6mm might work but is not tested. + +An interactive BOM is [provided](./ibom.html), the main active components on the PCB are: +* RaspberryPi RP2040 microcontroller +* W25Q128JVS Flash storage +* MCP1405 MOSFET driver +* Vishay SISS54DN-T1-GE3 Capacitor switching MOSFET +* Vishay SISH112DN-T1-GE3 Crowbar MOSFET +* NLSV1T34 Level shifter +* NCP1117 SOT223 3.3V voltage regulator + +At the the time of writing most of these components appear to be available or easily replaceable. +The cost for all components on the PCB at low volume should be less than 25 EUR. + +## Optional improvements before building the PCB +* Add a pull-down resistor on the `IN A` pin of the MCP1405 MOSFET driver. +* Modify the locations of the castellated holes in `interposer_footprint.kicad_mod`. Currently the rightmost castellated holes are not conveniently located, see the mounting instructions. +* Do some additional routing such that the RP2040 can monitor eMMC D0 and UART at the same time.
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