flipperzero-firmware/wiki/hw-1.0.md

# Hardware version 1.0

[device schematic](flipper_zero_rev_1_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](new-rfid-ibutton-sch.png)
add hw1.0 description and schematic 2020-08-02 05:17:52 +00:00			`# Hardware version 1.0`

Fix link path 2020-08-02 05:18:49 +00:00			`[device schematic](flipper_zero_rev_1_0.pdf)`
add hw1.0 description and schematic 2020-08-02 05:17:52 +00:00
			`## 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`
errata change 2020-08-02 05:21:32 +00:00			`* No series resistors on external gpio for protecting MCU`
add hw1.0 description and schematic 2020-08-02 05:17:52 +00:00			`* 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)`

add new rfid schematic image 2020-08-02 05:20:35 +00:00			`![new RFID + iButton schematic](new-rfid-ibutton-sch.png)`