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CC2652P: ZNP RF Signal strength issues

victor xu
Prodigy 90 points

Part Number: CC2652P
Other Parts Discussed in Thread: SYSCONFIG, Z-STACK

ZNP demo，we use it as ZC. It can be networked with ZED.But we found that the signal is very weak.

Is it related to the following pins? 

We disabled the VDDR on the software. I think the output power should be 12.5dBm. It running on 2.4GHz（13 channel）

  • 0
    Prodigy 90 points

    The effective distance is currently about 0.5 meters

  • 0
    Prodigy 90 points

    Do I need to set trans power in the code? The default value is 0

  • 0 in reply to victor xu
    TI__Guru**** 220787 points

    Hello victor,

    Do not disable the VDDR as it is needed to enable boost mode during High PA operation.  The comment you highlighted pertains mostly to Sub-1 GHz operation as it can reach >5 dBm output power without using the High PA.  You need to set the Transmit Power with the SysConfig -> Z-Stack -> Radio Configuration.  The options are between +14 and +20 dBm since the High PA has a programmable range of 6 dBm and the LAUNCHXL-CC1352P-2 is designed for the optimal output power transmission with 2.4 GHz.  The LAUNCHXL-CC1352P-2 allows for +6 to +10 dBm.

    Regards,
    Ryan

  • 0 in reply to Ryan Brown1
    Prodigy 90 points

    Hi Ryan，

    In the case of 1.8v power supply, we found that the MCU cannot run. The voltage of VDDR is abnormal, and it is suspected that the voltage rise is less than 1.95V. So we tried to disable VDDR, the voltage is normal to 1.68V, and the MCU can run, at the cost of losing part of the transmit power.

    We rework the motherboard for test, using 3.3v power supply does not have this issue, so our next version of the hardware will be modified.

    BR

    Victor

  • 0 in reply to victor xu
    TI__Guru**** 220787 points

    Along with the observed transmit power issues, I recommend operating above 2 V to reduce the risk of Z-Stack NV memory corruption.

    Regards,
    Ryan