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unleashed-firmware/wiki/hw/Hardware-version-F1B1C0.0.md
aanper cbfc5fad53 add wiki pages
2020-08-15 09:57:12 +03:00

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Device schematic (pdf)

Errata

  • NAND reset IC drive reset net by push-pull output may cause MCU fault and disable internal MCU reset feature.
  • System going to boot-loop state when reset by reset circuit
  • No series resistors on external gpio for protecting MCU
  • Wrong value LED series resistor
  • Wrong footprint for CMOS transistors
  • Wrong value IR TX series resistor
  • No need capacitor on IR RX
  • Wrong value IR RX pullup resistor
  • 125 kHz RFID + iButton wrong schematic
  • It seems bad to place main VCC on external GPIO pins. Overcurrent can damage main regulator and cause device broken. User can apply wrong voltage on this pin.

New RFID + iButton schematic

after many experiments we found good schematic solution for work with RFID and auxiliary follow iButton level (for non-TTL protocol like Cyphral)

new RFID + iButton schematic