unleashed-firmware/wiki/hw/Hardware-version-F1B1C0.0.md

[Device schematic (pdf)](https://github.com/Flipper-Zero/flipperzero-firmware-community/raw/master/wiki_static/F1B1C0.0.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](https://github.com/Flipper-Zero/flipperzero-firmware-community/raw/master/wiki_static/new-rfid-ibutton-sch.png)
add hardware version 1 files (#46) 2020-08-24 21:01:47 +03:00			`[Device schematic (pdf)](https://github.com/Flipper-Zero/flipperzero-firmware-community/raw/master/wiki_static/F1B1C0.0.pdf)`
add wiki pages 2020-08-15 09:57:12 +03:00
			`## 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)`

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			`![new RFID + iButton schematic](https://github.com/Flipper-Zero/flipperzero-firmware-community/raw/master/wiki_static/new-rfid-ibutton-sch.png)`