SIMIN pin of GE865-QUAD

2 thoughts on “SIMIN pin of GE865-QUAD

  1. Indicates SIM presence if is grounded. When flying voltage level is approx. 1,6V. How it is connected inside in module? It is possible to pull it up to 3,3V externally?

    1. From SIM Holder Design Application Guide:

       

      NOTES:
      SIMIN doesn’t require any pull-up resistor. It is built in.
      SIM card is detected inserted when this line is short to ground.
      If in the application the SIM holder doesn’t foresee the switch for the presence/absence
      of the SIM card, the SIMIN line must be connected to ground.