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sim300c jpg
I will use a SIM300C Module for a project. I read datasheet and some another documents about SIM300 but i can't understand about VDD_EXT pin.
1) I don't need VDD_EXT functitons so can i leave it floating?
2) Do i have to connect to VDD_EXT pin with a LDO?
3)
Why connect LDO to...
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