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23 lines
1.1 KiB
Markdown
23 lines
1.1 KiB
Markdown
## Board design files
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This directory contains Eagle CAD files as well as schematic PDFs and Gerber exports for board fabrication.
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The board stackup is good enough for either OSH Park 4-layer, or JLCPCB 4-layer with controlled impedance (JLC2313).
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### Latest Board
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Revision 10.0.1 is latest. It adds a few safety features such as ESD protection and isolation between the board's MCU pins and the outside world.
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An appropriate breakout board for series 10.x is included. The "TX OFF" signal is now buffered by a MOSFET on the transponder board and the
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logic is inverted.
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The LED "status" signals are now current-limited open drain outputs via N-Channel MOSFETs on the transponder board. This means they could work
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with any voltage up to 16V without risk of damage to the MCU.
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### Older Boards
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Revision 9.3.0 is not bad. I built it at JLCPCB with the exact gerber files I posted here. It is fully functional and performed as expected,
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with some caveats (no ESD protection, no reverse polarity protection)
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The 9.3 board adds 3 "status" signals that can drive LEDs (with appropriate current limiting resistors!). These are optional.
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