Sharagim
Advanced Member level 4
Hi,
I am developing a SIM900 board.
When I power it up most of the times I see "+CPIN: NOT INSERTED" and "+CPIN: NOT READY" a few times which it goes ready, after I make a call with ATD I see it wont response for a few seconds and then failed again. I became suspected to ESD protection of SIM Holder which is a "SMF05C" so I removed it and problem gone.
Is there any idea what is making this problem ?
I am developing a SIM900 board.
When I power it up most of the times I see "+CPIN: NOT INSERTED" and "+CPIN: NOT READY" a few times which it goes ready, after I make a call with ATD I see it wont response for a few seconds and then failed again. I became suspected to ESD protection of SIM Holder which is a "SMF05C" so I removed it and problem gone.
Is there any idea what is making this problem ?