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CC1120 Special Functionality

Richard Hicksted
Prodigy 225 points

Other Parts Discussed in Thread: CC1120

We are designing a new product that may be appropriate for the CC1120 or another chip in the family. I want to be able to do the following:

1.) Set the product in Receive mode but turn on the PA amplifier to create a  un modulated RF signal. Is there an option bit to allow this feature

2.) The product doesn't support the encoding desired. Is it p[ossilbe to load the FIFO with encoded data patterns which will directly modulate the RF carrier (ASK modulation is appropriate with the existing options)

3.) Likewise can the raw un decoded data be loaded into the FIFO for MPU decoding?

We would like to dicuss our needs further offline

 

 

  • 0
    TI__Mastermind 36415 points
    Richard,
    1. Not a problem, the way this is typically done is to set the radio in OOK/ASK mode, put one byte into the FIFO and start the transmission. The radio will then run our of bytes to send and it will keep the radio on and at the center frequency until you force and IDLE using the S_IDLE strobe.
    2. Yes, this is possible. For example a 0xF0 will give a long 1 and long 0 and 0xAA with give 2 short 1, 0 .
    3. NO, in transparent mode the FIFO is off and the data in presented on a GPIO in realtime.
    Regards,
    /TA 
  • 0 in reply to TA12012
    TI__Guru**** 317180 points

    1) Correction: For CC1120 the only thing required to send a CW is to set CFM_DATA_CFG.CFM_DATA_EN=1. For CC1120 if you don't set this bit and don't have anything in the FIFO the radio will send preamble. Did you intend to write Rx in this question or did you mean Tx?

    2) Which encoding are you looking for?

    3) Could you specify what you mean by undecoded data?

    If you are able to write slightly more about your application we can give you more information about which features you may use.

  • 0 in reply to TER
    Prodigy 225 points

    1.) Yes! I want to have CW transmitted while in Rx mode

    2.) I need to Transmit with PIE and Receive with FM0

    3.) What I mean is to take the data end create a corresponding data pattern as if it were encoded using PIE. From above, it seems that I could create a data pattern that represents the PIE encoded data and load it into the FIFO

  • 0 in reply to Richard Hicksted
    TI__Guru**** 317180 points

    CC1120is a half duplex device and out of the box it's not possible to send a CW at the same time as you are in RX.

    If I'm not mistaken you intend to use the CC1120 as a RFID reader. Any reason you can't use one of the dedicated RFIS products (http://www.ti.com/lsds/ti/microcontroller/near_field_communications/overview.page) ?

  • 0 in reply to TER
    Prodigy 225 points

    1.) Yes we are working on a UHF RFID Reader Writer

    2.) Cost is a serious issue and existing ICs are too expensive unless TI has something in the $1-$2 range

    3.) So regarding Half duplex I cannot turn on the PA amplifier in CW to output while in RX mode by setting CFM_DATA_CFG.CFM_DATA_EN=1?

    4.) Could I use two chips operated off a single crystal with one as a transmitter and the second as a receiver or some similar option?