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Question about the sim reset signal

Alex Wiitamaki

Hello,

We were wondering under what conditions the SIM will reset. AT commands will give us activity on the SIM_CLK and and SIM_IO lines, we are looking to see activity on the SIM_RST line for hardware test purposes.

Thanks,

Alex Wiitamaki

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    Hi again Alex.

    I've talked to our development team and unfortunately there is no way to directly control SIM_RST using AT Commands.

    It is possible to power of the SIM card using for example AT+CFUN=4, this will make SIM_RST go to '0', and power on the SIM card using AT+CFUN=1. These commands do have other effects in addition to the SIM card interface.

    And also as I said in my previous reply, SIM_RST will be used by the modem FW as an error recovery attempt if there is a problem with the SIM card, and the SIM card may also be powered off temporary for power saving reasons during PSM and eDRX periods.

    Best regards,

    Andreas

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  • 0

    Hi again Alex.

    I've talked to our development team and unfortunately there is no way to directly control SIM_RST using AT Commands.

    It is possible to power of the SIM card using for example AT+CFUN=4, this will make SIM_RST go to '0', and power on the SIM card using AT+CFUN=1. These commands do have other effects in addition to the SIM card interface.

    And also as I said in my previous reply, SIM_RST will be used by the modem FW as an error recovery attempt if there is a problem with the SIM card, and the SIM card may also be powered off temporary for power saving reasons during PSM and eDRX periods.

    Best regards,

    Andreas

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