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question about CC2530 in the smartRF studio platform

user3669836
Prodigy 60 points

Other Parts Discussed in Thread: CC2530, CC2591, CC2590, CC2592, CSD

I have a question, I need your help,thanks very much! After starting two CC2530 in the smartRF studio platform, I set the transmitter and reciever at the same channel,and the transmitter starts at the "Continuous TX" mode and select the "unmodulated",the reciever starts at the "Continue RX" mode.I can measure a sine wave of 2.4GHZ at the SAM antenna pin of the transmitter,but why cannot I measure any signals at the SAM antenna pin of the reciever? if I want to measured the signals of the receiver,how should I modify the registers? thanks very much

  • 0
    TI__Expert 3050 points
    Hi,

    Your post was forwarded to the respective HW/RF expert.

    Best regards,
    OD
  • 0 in reply to OD
    TI__Mastermind 36415 points
    This is a question of signal levels. On the transmit side we are putting out a 5dBm signals to the antenna. This corresponds to +/-40mV on the antenna port but when you transmit this over the air the loss put the voltage levels in the micro volts and your oscilloscope cannot see that.

    Regards,
    /TA
  • 0 in reply to TA12012
    Guru 11440 points
    hi

    i saw the swrc171.zip which suggested us how does CC2530 link with CC2591.




    i was so curious about those signals （PA_EN, LNA_EN and HGM_EN） connection。

    why does there are some series resistors located in the connection which are （R072，R142，R112 valued 1KΩ）？

    what is the purpose of this design？




    anymore， how can i insert the picture or file in the new post。。。。
  • 0 in reply to OD
    Guru 11440 points
    Hi，dear OD, i find that there is nothing to config the HGM_EN pin , if we use paLnaChip == PA_LNA_CC2591.

    and i test if i connect this pin(HGM_EN ) , CC2530+CC2591 will fail, if disconnect this pin(HGM_EN ) CC2530+CC2591 will success!!!



    #ifdefineded MAC_RUNTIME_CC2591 || defined MAC_RUNTIME_CC2590 || \
    defined MAC_RUNTIME_SE2431L || defined MAC_RUNTIME_CC2592 || \
    defined HAL_PA_LNA || defined HAL_PA_LNA_CC2590 || \
    defined HAL_PA_LNA_SE2431L || defined HAL_PA_LNA_CC2592
    { /* either if compound statement or non-conditional compound statement */

    /* (Re-)Configure PA and LNA control signals to RF frontend chips.
    * Note that The register values are not retained during sleep.
    */

    if (paLnaChip == PA_LNA_SE2431L)
    {
    /* CPS or P0_7 maps closely to the HGM line */
    HAL_PA_LNA_RX_HGM();

    /* EN or CSD line is controlled via software so setting it high here to start the SE2431L frontend */
    HAL_PA_LNA_RX_CSD_HIGH();

    /* CTX or P1_1 maps closely to PAEN */
    RFC_OBS_CTRL0 = RFC_OBS_CTRL_PA_PD_INV;
    OBSSEL1 = OBSSEL_OBS_CTRL0;
    }
    else if(paLnaChip == PA_LNA_CC2592)
    {
    /* P1_1 -> PAEN */
    RFC_OBS_CTRL0 = RFC_OBS_CTRL_PA_PD_INV;
    OBSSEL1 = OBSSEL_OBS_CTRL0;

    /* P1_0 -> EN (LNA control) */
    RFC_OBS_CTRL1 = RFC_OBS_CTRL_LNAMIX_PD_INV;
    OBSSEL0 = OBSSEL_OBS_CTRL1;
    }
    else
    {
    /* P1_1 -> PAEN */
    RFC_OBS_CTRL0 = RFC_OBS_CTRL_PA_PD_INV;
    OBSSEL1 = OBSSEL_OBS_CTRL0;

    /* P1_4 -> EN (LNA control) */
    RFC_OBS_CTRL1 = RFC_OBS_CTRL_LNAMIX_PD_INV;
    OBSSEL4 = OBSSEL_OBS_CTRL1;//CHANGE P1_3
    }

    /* For any RX, change CCA settings for CC2591 compression workaround.
    * This will override LNA control if CC2591_COMPRESSION_WORKAROUND
    * flag is defined.
    */
    }
    #endif