• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 3 answers
  • Subscribers 33 subscribers
  • Views 997 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

IWR6843AOPEVM: ROS Driver dropping message

IWR6843AOPEVM: Daisy chaining multiple radars through SYNC_IN/SYNC_OUT

Morten Nissov
Intellectual 390 points
Part Number: IWR6843AOPEVM
Other Parts Discussed in Thread: IWR6843AOP, AWR2243

PROC091F(001)_Sch.PDF

I noticed both `AR_SYNC_IN` AND `AR_SYNC_OUT_SOP1` pins on the schematic. Is it possible to daisy chain multiple radars through their SYNC_IN/SYNC_OUT pins?

Is there any written guidance that I can look at for doing this?

  • 0
    TI__Mastermind 25835 points

    Hello Morten Nissov,

        IWR6843AOP device doesn't have LO (Local oscillator) output capability, hence it cannot be Daisy chinned to increase number of  Tx/Rxs. 

    Sync_in pin would support for Hardware trigged configuration instead of Sotware triggered configuration. 

    True daisy chain capability exists in AWR2243 devices, you could refer to below app-note, This kind of configuration is not supported in IWR6843AOP devices.

    https://www.ti.com/lit/an/swra574b/swra574b.pdf

    Thanks and regards,

    CHETHAN KUMAR Y.B.

       

  • 0 in reply to CHETHAN KUMAR Y.B.
    Intellectual 390 points

    By daisy chained i mean to synchronize several radars, I suppose alternatively I can generate the sync pulse externally and pass it to each of the radar's SYNC_IN pins.

    My question was whether or not I need this external functionality or whether I can do without since the radar have SYNC_OUT pins. I guess this is not possible?

  • 0 in reply to Morten Nissov
    TI__Mastermind 25835 points

    Hello Morten Nissov,

      You could trigger multiple radar in frame synchronised manner using hardware trigger using SYNC-IN pins. You could use the SYNC-OUT pin to generate trigger pulses generated internal timer and configure pin as GPIO and drive these pulses to SYNC-IN pins of remaining radar modules.  However this type of radar synchronisation technique is different from Coherent LO based synchronisation technique mentioned above.

    Thanks and regards,

    CHETHAN KUMAR Y.B.

  • 0 in reply to CHETHAN KUMAR Y.B.
    Intellectual 390 points

    Sorry If I'm not understanding, my only goal here is to have multiple radars which initiate measurements at the same time.

    You said that they don't have local oscillators, so is one radar capable of generating the sync pulse for another, or will I need to generate this externally?


  • 0 in reply to Morten Nissov
    TI__Mastermind 25835 points

    Morten Nissov,

        Both are possible, You could use external trigger circuit to generate Hardware sync pulses to trigger mmWave sensor or You could use any GPIOs from the mmWave devices and program the GPIOs to generate the trigger pulses and feed that signal to Sync_in pin to hardware trigger mmWave sensors. Please note API need to be programmed to trigger as "HW triggered" instead of Software triggered. 

    Thanks and regards,

    CHETHAN KUMAR Y.B.