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Hardware Errata

This page documents some issues with the hardware.

Rev 3

  • Footprint for RTC backup battery (BT301) is backwards
    • The + terminal of the battery connects to the GND node, and vice versa.
    • Resolution: Populate battery in reverse
  • Incorrect power-on reset behavior
    • There is no reset pulse generated on boot-up (by an external reset generator… which we don't have. lol) which causes spurious boot failures
      • So, we should add a supervisor for the reset line
      • Generate a power on reset pulse of ~1 sec with the +5V rail
    • We may need to shorten the reset delay on the +3V3 voltage supervisor line
      • Alternatively – directly use the +3V3 input to switch it
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