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CC1120: Communication problem with CC1020

Chase Jeong
Genius 4670 points
Part Number: CC1120
Other Parts Discussed in Thread: CC1020,

Hello TI experts,

now my customer is testing their concept with CC1120EVM, there is some problem with communication with CC1020EVM.

in fact they already used CC1020EVM before this development, and now they added CC1020 for their product.

for the first step they tested sniff mode, from CC1020 to CC1120.

1. export the register to *.psr file in SmartRF Studio 7.

2. import *.psr file in Packet Sniffer to set CC1120.

3-1 they tested normal RX mode first, they succeeded and can see data format as above screenshot.

3-2. but when they test sniff mode with all same other settings, they cannot see anything in this window.

is there any settings that I should change when testing sniff mode?

4. and they tested more, if they set the parameter of sync0 / sync1 / sync2 / sync3 to AA all, they can see RX data to CC1120, but they have CRC error.

can you explain more about this Sync word settings? or it will helpful to me if you give me some documents for this.

5. can you explain the setting about "PA Ramping" and "Whitening" in SmartRF Studio as you see the screenshot above?

6. How about Symbol rate? if I want to set data rate to 2.4Kbps, is it right to set Symbol rate to 2.4ksps?

I think there are too many questions in one post. i am sorry about it. please check this issues. Thanks.

Best regards,

Chase

  • 0
    TI__Mastermind 29570 points

    Hi,

    More info on Sniff mode and is available in the app note: 

    For more info on the SYNC word, please refer to the user guide, section 6.7 on SYNC word detection: 

    PA Ramping is the concept of starting a PA at a lower power and then gradually increasing the power to the designated level in stages. This helps reducing harmonics and PA pulling effects.

    Data whitening: radio operation is optimized when the data bits being transmitted are random and DC-free, not only because this gives a smooth power distribution over the occupied RF bandwidth, but also because random and DC-free data prevents the possibility of data dependencies in the receiver control loops. Many times, however, the data to be transmitted contains long strings of zeroes and ones. Performance can be improved by whitening the data before transmission. Whitening the data before transmission requires that the receiver undo the whitening before outputting the received data.


    In this example, the data rate is the same as the symbol rate.

    Regards,

       Richard