https://devzone.nordicsemi.com/f/nordic-q-a/62516/nrf9160-level-translator-requirementWe are using nRF9160 as the host MCU and Modem for communicating to server. If VDD_GPIO is powered by 3V external supply and SIM card is powered by VDD_SIM i.e. 1.8V Do we need a level translator in between the SIM card and nRF9160 signals which are SIM_ClKen-USTelligent Community 13Fri, 12 Jun 2020 11:20:53 GMThttps://devzone.nordicsemi.com/thread/254692?ContentTypeID=1Fri, 12 Jun 2020 11:20:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9fb0b3fd-546c-41c0-9e8c-56083cfac032H&#229;kon Alseth<p>Hi,</p> <p>&nbsp;</p> <p>&nbsp;</p> [quote user=""]Do we need a level translator in between the SIM card and nRF9160 signals which are SIM_ClK, SIM_RESET, SIM_I/O[/quote] <p>&nbsp;No. The sim card is handled by the modem, and the VDD_SIM is 1.8V, regardless of what you run your GPIOs on.</p> <p>&nbsp;</p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>