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CC2642R: How to remve the impulse waveforms

Depeng Man
Intellectual 2030 points
Part Number: CC2642R
Other Parts Discussed in Thread: CC2652R, CC2530

Hi Team,

We made a battery-operated product with CC2642R1, and it is currently being certified, and we have failed because of the small pulse waveform that occurs every second as shown in the graph below. Can you give us some advice on how we can get rid of these little impulse waveforms? And please close ticket number CS1207596.

Thank you，

James

  • 0
    TI__Guru** 101460 points

    Hi James,

    Thank you for reaching out.

    May i kindly ask you to specify which certification you have attempted? Could you also specify what are the limits acceptable for the pulses?

    In addition it would be helpful if you could provide a zoomed-view on the pulses as it will help our engineers to understand what they correspond to.

    To finish, could you please provide the list of the peripherals (UART, I2C, Timers, Watchdog, GPIO, etc.) and the RF Stacks (BLEStack, Zigbee, etc.) enabled on the device?

    Best regards,

  • 0
    TI__Guru**** 218277 points

    Hi James,

    These are recharge pulses to charge up the VDDR capacitor.  The average power consumption during Standby including recharge that is approximately 1 μA.  You will not be able to remove these necessary pulses. https://www.ti.com/lit/swra478 

    Regards,
    Ryan

  • 0 in reply to Ryan Brown1
    TI__Intellectual 2030 points

    Hi Clément,

    Yes, I believe these pulses are VDDR capacitor pulses. However, we have seen that the CC2530 does not generate VDDR capacitor charge pulses. So I think there must be a way to get rid of the charge pulse on the CC2652R as well.

    If in Shutdown mode, can the VDDR charge pulse be removed?
    If I go into Shutdown mode, can I run the watchdog at a lower clock speed? Finally, we would like to wakeup every 4 hours.

    Thank you，

    James

  • 0 in reply to Depeng Man
    TI__Guru** 101460 points

    Hi James,

    You can leverage the example gpioshutdown to check the device's behavior in shtdown mode. Please refer to <SDK>\examples\rtos\CC26X2R1_LAUNCHXL\drivers\gpioshutdown

    I hope this will help,

    Best regards,