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unleashed-firmware/wiki/hw/Hardware-version-F1B1C0.0.md
Henry 134a6e5b5f
Updated wiki pages to use lfs objects (#58) 
- Added stm32f4 hal and ll drivers pdf
- Removed all the lfs objects to the old wiki
- Removed lfs gitattribute garbage

Signed-off-by: Henry Pauli <henry@mixict.nl>

Co-authored-by: Henry Paulissen <henry@mixict.nl>
2020-08-28 18:57:26 +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