I want to create a PCB design for this . In datasheet of SIM800L i found it has many ground pins. datasheet recommend this :
My first question : is just using 2 , 43 , 44 and 45 pins enough and i should not connect other ground pins to the ground . So leave them unconnected .
I have SIM800L module but it has not power key .
My second question : if i leave Power Key Unconnected its will start working without problem ? i did not see any power key in module too.
My third question : according to information above. can i us 3.3v for VSIM ?
My fourth question : what you think about these 3 capacitors . ( i guess they used for VBAT ) ?
My fifth question : what is the minimum width for routin line in a PCB specially for this IC ?