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Original question:

CC1125: CC1125 136-174MHz Band Design

CC1125: QUERIES ABOUT CC1125 FREQUENCY BAND

MANIKANTA SAI SRINIVAS KUDAMA
Prodigy 20 points
Part Number: CC1125
Other Parts Discussed in Thread: CC1175

Tool/software:

Hi,

    I am working on CC1125 with the integration of PSOC microcontroller. And I am trying to send and receive the data between the frequency bands which are not supported by CC1125 as mentioned above. Is it strictly prohibited to these frequency bands or can I work on some other frequency bands between 480MHz and 820MHz which are not in the valid frequency ranges of CC1125?

Best Regards,

K. Manikanta Sai Srinivas.

  • +1
    TI__Guru* 78051 points

    Hi Manikanta,

    Regional regulations specify what is prohibited in a given country.

    You can use the device to transmit on your frequency and in many cases it will work well. However we have not characterized these frequencies and we cannot know anything about the performance.

    Cheers,

    Marie H

  • 0 in reply to Marie H
    Prodigy 20 points

    Hi Marie,

                Thanks for your response and I need to know one more query regarding the integration of cc1125 with the PSOC while receiving the data. I want to incorporate the RXFIFO_THR_PKT interrupt as a GPIO interrupt which is associated with the RX FIFO. This interrupt has to be asserted when the RX FIFO is filled above FIFO_CFG.FIFO_THR or the end of packet is reached as per the user guide of cc1125. Can you explain how that interrupt has to be asserted and I am transmitting some packets with the size of 100bytes each from TX side CC1125 eval board and I am able to receive the packets by including 1 byte of packet length and 2 bytes of sequence counter along with 100 bytes of data but the last 2 bytes of the data is being added before the packet length of the received stack of bytes as it should come sequentially to the data bytes which we are transmitted. Can you please explain about this.

    Thanking you,

    Kind Regards,

    K.Manikanta Sai Srinivas

  • 0 in reply to MANIKANTA SAI SRINIVAS KUDAMA
    TI__Guru* 78051 points

    Hi Manikanta,

    The FIFOs on CC1125 are 128 bytes so the full packet (100 bytes) should fit.

    Please keep in mind that the FIFO_THR starts on 0, whic corresponds to one byte in the RX FIFO. See table 26 in the User's Guide.

    Cheers,

    Marie H

  • 0 in reply to Marie H
    Prodigy 20 points

    Hi Marie,

                 I want to perform transmission of CC1125 with 480MHz to 527MHz frequencies but for the particular band we don't have LO divider value as they were not in use as shown in below to get the frequency configuration registers. Can you please mention that LO Divider value for that particular frequency band. 

    Thanking you,

    Kind Regards,

    K.Manikanta Sai Srinivas

  • 0 in reply to MANIKANTA SAI SRINIVAS KUDAMA
    TI__Guru* 78051 points

    Hi Manikata,

    You can generate settings for any frequency with SmartRF Studio 7.

    https://www.ti.com/tool/download/SMARTRF-STUDIO-7/2.29.0

    Cheers,

    Marie H

  • 0 in reply to Marie H
    Prodigy 20 points

    Hi Marie,

                 I have tried the smart RF studio, but whenever I am changing the carrier frequency configuration of any of the frequencies which are there in that above mentioned 480MHz to 527MHz, I am getting like as mentioned below .

    Thanking you,

    Kind Regards,

    K. Manikanta Sai Srinivas.

  • 0 in reply to MANIKANTA SAI SRINIVAS KUDAMA
    TI__Guru* 78051 points

    Hi Manikata,

    Yes this is the same warning I gave you. You will still be able to generate settings.

    Cheers,

    Marie H

  • 0 in reply to Marie H
    TI__Genius 13890 points

    Hi Manikata,

    The synth may not lock when using the CC1125 outside of the frequency ranges listed in the datasheet. However, the reason these ranges are stated is because this is what the VCO tuning range supports.

    From Section 9.12 of SWRU295 (CC112X/CC1175 Low-Power High Performance Sub-1 GHz RF Transceivers/Transmitter User’s Guide): https://www.ti.com/lit/swru295 , using the CC1125 outside of these ranges may work on some devices but it is limited by the possible LO divider settings; the RF frequency is given by the VCO frequency / LO divider, where the possible LO_DIVIDER settings are 4, 8, 12, 16, 20, and 24. The bands not listed in the datasheet are not covered and we do not support them.

    Regards,
    Zack