RAK3172 Internal Schematic

I wrote custom firmware for the RAK4270 and would like to port it to the RAK3172 but haven’t been able to find an internal schematic.

Are there any documents detailing the RF switch pins, TXCO specs, and any other information about the module that would be useful for writing firmware? With the additional pins and lower price point, it’s a very exciting new module for custom applications!

Hello @mintenj

I am sorry, but we are not releasing the internal schematic of the RAK3172.
About the RF switch and TCXO control I can give you only a snapshot of the connections.

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That’s perfect, thank you for the information on connections!

Would it be possible to also get either the part number or specs for the TXCO. I would like to use the RX duty cycling feature which makes the minimum settling time very important, as well as it’s input voltage range. It’s also helpful to know the accuracy and temperature variance to determine what modulation settings are possible.

I have to check next week. I do not have the BOM of the RAK3172.

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you can check this breakout board I made here

Then associated definition I made for mbed-os but shows pinout

and the radio driver done accordingly here to control the pin

    // Radio specific controls (TX/RX duplexer switch control)
    mbed::DigitalOut _rf_switch_ctrl1(PB_8);
    mbed::DigitalOut _rf_switch_ctrl2(PC_13);

Confirmed to work I had some trouble to connect at the beginning because at 1st start I left TXCO feature enabled.


Impressive work @Charles :100:

Nothing fancy or complicated in the design. Just pure functionality and it is great to hear it works smoothly!

Can we share it via our social media channels so many other people can see it? :slight_smile:


Thank you @carlrowan, but you helped me a lot providing the needed information, thanks :slight_smile:

Sure you can share, of course.


Very nice work! Thank you for sharing!

Any luck with the TCXO datasheet?

Sorry, I do not have got any feedback. It looks like we have several similar TCXO from different suppliers in our BOM because of the current electronic component crisis. => RAKwireless: Update on Components Lead Time

Thank you very much [Charles] !