ThiVu
Junior Member level 2
Anyone help me?
The SIM_VDD pin of my SIM900B is alway = 0 when insert or not insert SIM Card.
The cap from VCC (of SIM Card) to ground is 220nF.
The cap from SIM_IO (of SIM Card) to ground is 10pF.
And VBat = 4.6V.
Because SIM_VDD = 0 , I dont detect SIMCard..
What can i do to solve it?
Thanks.
The SIM_VDD pin of my SIM900B is alway = 0 when insert or not insert SIM Card.
The cap from VCC (of SIM Card) to ground is 220nF.
The cap from SIM_IO (of SIM Card) to ground is 10pF.
And VBat = 4.6V.
Because SIM_VDD = 0 , I dont detect SIMCard..
What can i do to solve it?
Thanks.