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CC2650STK: CC2650STK UART Output and External Digital Input via DevPack Connector

ismail hakkı turan
Prodigy 10 points
Part Number: CC2650STK
Other Parts Discussed in Thread: CC1352R, CC2650

Tool/software:

Hi there,

As part of a research project, we have purchased 17 units of the CC2650STK Sensortag. We are planning to run Contiki-NG in TSCH mode on these devices.

When I flash the device, I would like to read the Contiki-NG serial (print) output from my laptop, just as I do with my CC1352R SensorTag devices.

I see that the device has a DevPack Connector, specifically a Samtec Inc. LSS-110-01-F-DV-A-TR model, and I noticed UART_TX and UART_RX pins on it. However, I couldn’t determine whether this connector is male or female.

My Questions:

  1. Would it be appropriate to buy a connector like the following and manually solder cables to access UART or is there any other useful products?

  2. I also need to perform digital input reading from the external environment. Is the DevPack connector the only way to interface with digital inputs as well?

Thanks in advance for your help!

Best regards,
İsmail Hakkı TURAN
ismailhakkituran.github.io/

  • +1
    TI__Expert 5520 points

    Hi !

    The recommended way to read UART is to use a SensorTag DevPack( CC-DEVPACK-DEBUG ) and connect it to your CC2650STK SensorTag board like this

    I assume that the UART would be accessible either through the pin holes on the dev pack or through the USB connection.

    You could technically buy a LSS-110-01-F-DV-A-TR connector and solder the UART pad of the connector. The LSS connector is hermaphroditic and genderless, which means it only connects to another LSS similar connector, no matter their gender (you can imagine that it has both the male and female connectors in one connector). This would probably work but I don't know how you would read UART on your PC through the pin you soldered without a logic analyser.

    As for the digital input reading from the external environment, a DevPack would also be the recommended option. But just as for the UART, you can probably solder the right pad of a LSS connector and read the data through this soldering. 

    Kind regards,
    Maxence

  • 0 in reply to Lea
    Prodigy 10 points

    Thank you very much for the quick response!

    I am currently able to flash the CC2650 SensorTag using a CC1352 LaunchPad, but unfortunately, I cannot read serial output from the CC2650 via the LaunchPad.

    Until now, I thought the CC2650 DevPack was just an older revision of the SensorTag. Thanks to your explanation, I now understand its actual purpose — I really appreciate it. To stay within our project budget, I will purchase two units to use for serial debugging only.

    However, I still need to perform digital input reading on 17 CC2650 SensorTag devices, and buying 17 DevPacks is not feasible from a financial perspective.
    Also, the LSS-110-01-F-DV-A-TR connector on the SensorTag is very small, and manual soldering may result in damage.

    Is there any pre-made cable or wire assembly available that is compatible with the LSS-110-01-F-DV-A-TR connector?
    Ideally, I would like to use such a cable and just isolate the digital input lines I need, without having to solder directly. Unfortunately, I haven’t been able to find any such cable or harness online.

    Thanks again for your support!

    Best regards,
    İsmail Hakkı TURAN
    ismailhakkituran.github.io/

  • 0 in reply to ismail hakkı turan
    TI__Expert 5520 points

    Hi ismail !

    I'm sorry but I'm not aware of any pre-made cable or wire assembly that can directly connect to a LSS-110-01-F-DV-A-TR connector. 

    Moreover I'm not allowed to redirect you to any reseller or external websites that sell such components.

    Kind regards,
    Maxence