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CC1350: 433MHz for Sub 1G communication

Brijesh Varghese
Intellectual 710 points
Part Number: CC1350

Hi,

We are designing a device with cc1350, and the required Sub1GHz frequency is 433MHz. We are referring TI sensor tag design files, but the frequency is 915MHz and 868 MHz. What are the design changes required use 433MHz for Sub 1GHz communication. 

  • 0
    TI__Guru**** 317180 points

    For differential frontend see  and 

    http://www.ti.com/lit/zip/swrc330

    We have not looked at a single ended match/ filter for 433 MHz. 

  • 0 in reply to TER
    Intellectual 710 points
    Hi,
    Thanks for the quick reply. Is there any design guide for single ended match/filter for 433MHz.
  • 0 in reply to Brijesh Varghese
    TI__Guru**** 317180 points
    As I wrote in my last in my last post: We have not looked at a single ended match/ filter for 433 MHz.

    Are you planning to use 433 MHz + 868 MHz or 2.4 MHz and why not use a differential design?
  • 0 in reply to TER
    Intellectual 710 points
    Hi,
    We need only 433 MHz for Sub 1 GHz and 2.4 for BLE. 868 Mhz is not required. We have already developed a module with 915Mhz with single ended design, so porting the firmware will be easy to new module. If we are going for differential design, we will lose 2 GPIO pin for controlling the RF switch(at least 1GPIO) and also BOM cost will be high.
  • 0 in reply to Brijesh Varghese
    TI__Guru**** 317180 points
    As a starting point, check the 433 MHz and 868 MHz differential reference designs and note the scaling of the components. Then look at the sensor tag design and scale this design with the same factor. Note that some energy leaks from RF_P to RF_N and the other way around meaning that adding a RF switch to the 2.4 GHz path could be required to avoid harmonics of 433 MHz on the 2.4 GHz antenna. Also see e2e.ti.com/.../2279972 for some other details. Since we haven't tested this combination it's unfortunately not possible to give you any "this will work" pointers.