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IWR6843AOP: Max Hardware Trigger Rate

Part Number: IWR6843AOP

I am trying to integrate and deconflict several radars using the "Hardware Trigger" and "Frame Trigger Delay in ms" mentioned in the SDK user guide. My goal is to trigger the system at 40Hz. I have verified that my configuration is good and I am getting the expected 40Hz RX rate when my frame trigger delay is set to 0.0ms. However, once I increase the frame trigger delay to a value greater than 1.0ms the frame rate I receive over UART drops from 40Hz to 20-30Hz. Is this expected?

  • Hi,

    You must follow the timing requirements for HW trigger/Frame trigger delay listed in the Interface Control Document (ICD).

    For more information, please see the mmWave ICD which is available as part of the mmWave DFP package.

    Best Regards,


  • Thanks this is really helpful information. I did some testing and it seems like I needed to change the <burstPeriodicity> and <subFramePeriodicity> in subFrameCfg to both be ((SYNC_INPeriodicity) - (FrameTriggerDelay)). Once I made that change I started getting data consistently reported at 40Hz from all radars. I'm not sure, but it seems like that may be a bug in the demo firmware.