Xiamen Four-Faith Communication Technology Co. Ltd. F8L10D-N 用户手册
F8L10D-N LoRa Module User Manual
Page 28 of 33
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Figure 5-4 MCU Control Triode Reset Reference Circuit
3, RESET hardware reset pulse width of at least 200ms, the effective low level can
not be higher than 0.4V, otherwise it may not make the module completely reset.
5.3 GPIO protection circuit
The voltage on any digital pin must be bigger than -0.3V,smaller than VDD+0.3V. If the
voltage was bigger than +3.9V, it may damage module immediately. We didn't provide
GPIO protection circuit. If you need protect it,the general method is using TVS,as figure
below.
Figure 5-5 TVS protection circuit for digital pin