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| Question | Outcome |
|---|---|
UART/USB? If we use USB, may need serial-to-usb converters on-board (In-car debugging) | UART only, we can reprogram our ST-Link V2 Clones to receive UART |
| Daisy chaining 12V power or not (LV power granularity) | No daisy chaining, 12V power from carrier only |
| Hermaphroditic board-to-board connectors or not | Non-hermaphroditic bergstak connectors |
Switching regulator circuit or integrated DC-DC converter (board complexity, cost) | Switching regulator circuit due to price and component height |
LQFP vs UFQFPN | LQFP for ease of rework |
How many pins do we dedicate to 3.3V, 12V, and GND on the mezzanine? | 3.3V: 6 pins GND: 8 pins These were determined based on the number of pins we have left from using all the GPIOs. Ground was chosen to be on both sides to ensure a good connection. |
| 0.5mm or 0.8mm pitch mezzanine connectors? | 0.5 mm |
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Key Components
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