nRF9160DK onboard SD-card connector

Hey,

There is a microSD connector on the bottom of the nRF9160DK (v.1.0.2). Is there a way to utilize it as an external memory? I can't find any information about it on the documentation/DevZone.

Pin3 on the reader seems to connect to pin125 on the SiP if I short SB2, however, on the documentation this pin is labeled as "Reserved". Does this mean the pin cannot be used yet? If so, is it possible to solder a jumper wire from the reader side of the bridge to a GPIO pin and use it instead? Can the rest of the pins connecting the reader be used? They seem to be connected to GPIO-pins 0.21-0.25, but also to U18.

It could be useful for logging data for extended periods without the need to be connected to a PC.

Thanks in advance!

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  • Hi,

     

    Pin3 on the reader seems to connect to pin125 on the SiP if I short SB2, however, on the documentation this pin is labeled as "Reserved". Does this mean the pin cannot be used yet?

     Yes, that pin is reserved for other uses, and cannot be used by the application.

     

    If so, is it possible to solder a jumper wire from the reader side of the bridge to a GPIO pin and use it instead? Can the rest of the pins connecting the reader be used? They seem to be connected to GPIO-pins 0.21-0.25, but also to U18.

     Yes, I believe you can use the other pins from the application. And, I don't see any problems with jumping the connector side of the solder bridge to one of the free GPIOs. Just make sure that the solder bridge is not connected.

    Pins P0.21-P0.23 can be routed to the nRF52840 on the DK, instead of the headers. That is why they are going through U8. But, looking at the documentation, the default is that they are routed to the header (and connector): https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/boards/arm/nrf9160dk_nrf52840/doc/index.html#board-controller-firmware

    Best regards,

    Didrik

Reply
  • Hi,

     

    Pin3 on the reader seems to connect to pin125 on the SiP if I short SB2, however, on the documentation this pin is labeled as "Reserved". Does this mean the pin cannot be used yet?

     Yes, that pin is reserved for other uses, and cannot be used by the application.

     

    If so, is it possible to solder a jumper wire from the reader side of the bridge to a GPIO pin and use it instead? Can the rest of the pins connecting the reader be used? They seem to be connected to GPIO-pins 0.21-0.25, but also to U18.

     Yes, I believe you can use the other pins from the application. And, I don't see any problems with jumping the connector side of the solder bridge to one of the free GPIOs. Just make sure that the solder bridge is not connected.

    Pins P0.21-P0.23 can be routed to the nRF52840 on the DK, instead of the headers. That is why they are going through U8. But, looking at the documentation, the default is that they are routed to the header (and connector): https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/boards/arm/nrf9160dk_nrf52840/doc/index.html#board-controller-firmware

    Best regards,

    Didrik

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