AT%XSIM? returns 0,90

[FromAtotheZ]

Hi,

I have a custom board based on the PCA10015 where im not getting any contact between the NRF9160 and the IBASIS SIM.

The SIM is in the correct way and i have the same issue on all my boards even after reflowing, sims work with my thingy and DK.

They are all running the 1.3.0 modem firmware and CONFIG_NRF_MODEM_LIB and CONFIG_NET_SOCKETS_OFFLOAD are both defined.

I get a short pulse on the SIM_1V8 line when the modem activates through AT+CFUN=1 then 0v, it wont stay on like the thingy.

I have a CM1402 between the nrf chip and the uicc, SIM_DET is left floating.

XSIM returns 0 and CEREG returns 90.

The antenna finds the networks so I assume its working and its a problem with how my modem software is implemented?

How do I initializing the UICC correctly and keep the modem from shutting down?

[helsing]

Hi Simen,

Thank you for the questions. Just to rule things out, what are the voltage requirements for the SIM? Is it rated for 1V8?

Best regards,

Håkon

[FromAtotheZ]

Yes, I'm using the IBASIS sim that came with the Thingy and DK. Both the voltage requirements and ratings should be good.

[FromAtotheZ]

Hi Håkon,

Any thoughts on what else might be the problem?

[FromAtotheZ]

This happens when you net label SIM_IO as SIM_CLK and opposite