add wiki pages

2020-08-15 09:57:12 +03:00
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+[Device schematic (pdf)](https://github.com/Flipper-Zero/wiki/raw/master/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](https://github.com/Flipper-Zero/wiki/raw/master/images/new-rfid-ibutton-sch.png)