we use GE865 with a normal SIM card holder and it works fine. Now we have changed to a SIM on chip and it don’t work any more.
Is there any additional detail we must aware?
A hint in this matter is highly appreciated.
In what way is not working? What SIM on chip, how is connected, are all integration specifications applied?
SIM don’t answer.
From T-Mobile Germany
Connection is made like a normal SIM card holder, just SIMIN(on module site) is direct grounded and the I/O from SIM have an external pull up resistor from 47k according to the documentation from SIM on chip manufacturer.
Yes all specifications are applied I hope.
I think a direct investigation on hardware signals can give some answers. What voltage levels is using that chip?
The voltage range is specified from 1,6V to 5,5 V
are there any news in the matter?
So did you some investigations with a scope? Is data flowing on lines?
This is typical SIM on chip connection. In this case SIMIN is connected to the chip.
What is AT+CPIN? response ? set AT+CMEE=2 first.
Please use an oscilloscope as suggested by Cosmin to verify SIM lines (VCC, IO, CLK…).
With AT#SIMDET=0/1 you can simulate SIM removal/insertion.
Thank you for your replay. I will check it after my holiday in february.
Problem solved. We removed the suggested pull up resitors. Now it works. Thank you for assistance.
Thank you Michael for the update.
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