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Communication between CC110L / CC1121 and Atmel ATA5428

Samuel Vestlin
Prodigy 30 points
Other Parts Discussed in Thread: CC110L, CC1121, MSP430F2012, MSP430F1232

We are currently using Atmel transceiver ATA5428 on 433.92MHz but are looking to replace this with a more modern transceiver. We want the new transceiver to be able to communicate with ATA5428, i.e. backwards compatible.

I have started to test if this is possible using an eZ430-Chronos-433 kit and Smart RF Studio 7. I enter our current configuration in Smart RF Studio:
433.92MHz
On/Off keying, Manchester coding
9600 baud
Preamble: 0xFF 0xFF

Unfortunatly I can not manage to get the TI and Atmel transceivers to hear each other. I can see the received power in "Continous RX" mode but no packets arrive in "Packet RX". So my question is; is it possible to get an Atmel and a Texas transceiver to talk using On/Off keying?

  • 0
    TI__Guru**** 317180 points

    If you use the same RF parameters on both radios it should not be a problem communicating.

    You say that you use a preamble but do you use sync? Have you turned on/ off this at the receive end?

    I haven't looked at the datasheet of the Atmel part, for this device is a '0' the same length as a '1'?

  • 0 in reply to TER
    Prodigy 30 points

    Good to hear that it should work, then we just need to figure out how to make it happen.

    I have turned off both preamble and sync, however when sending data from SmartRF Studio I emulate the expected preamble (0xFF 0xFF) and sync-word (0x36). An example package looks like this: FF FF 36 42 2D 4A F1 D2 78 78 78 78 78 78 48 AF

    From what I can see in the datasheet, Atmel codes a "0" the same length as a "1". In Manchester code a "0" is a high-to-low transition and a "1" a low-to-high transition. (page 53 in http://www.atmel.com/Images/Atmel-4841-Transceiver-ICs-ATA5428_Datasheet.pdf)

    The received signal is strong, about -40 dBm and I have tested the communication between two eZ430-Chronos and it works as expected.

    Any more clues?

  • 0 in reply to Samuel Vestlin
    TI__Guru**** 317180 points

    Do you plan to use the FIFO or sync serial mode on CC110L/ CC1121? You wrote that you are interested in CC110L and CC1121. Are you interested in both?

    In cases like this I would prefer to play with the hardware.

    Is it possible to send us a couple of the Atmel transceiver based system you use so we can see what we can achieve?

  • 0 in reply to TER
    Prodigy 30 points

    I plan to use the FIFO. I have not decided yet if CC110L is good enough or we might need the more advanced features of CC1121, maybe in the future we will.

    It is possible for us to send some HW. We have one platform with MSP430F2012 + ATA5428 and one with MSP430F1232 + ATA5428. I suggest you send a direct e-mail to me and we'll take the details there.