In my custom board,we are interfacing SIM800C GSM with ATmega32U4microcontroller. we are powering sim800C with 3.93V.
problem::"For every 6seconds GSM is restarting that is indicated by status led "..We have checked supply voltage to the GSM with multimeter..It is showing 3.93V consistently without any undershoots in voltage in multimeter
The above problem is occurring only,when SIM is inserted ..if SIM not inserted ,it is consistently in ON state as intended.
So,We have tested GSM with supply voltage 4.3V from other regulated power source also..but showing same issue as usual..
please suggest me any solution for this problem.. :( :( :(