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CC2564B BLE power vector

Joel Lauber
Prodigy 240 points

Hello,

We want to setup a PER measurement in our production line with CC2564B. The test is done over the air in a RF immunity box.

To check the sensitivity we want to vary the TX output power. With CC2564B the default vector is defined from 12dBm to -23dBm with one at -50dBm.

We were able to change the actual power vector once after power up, Apply service pack, apply ble add on.

We observed that we only can go down to -35dBm. We observed as well that the step size could be 1dBm. In the datasheet we cannot find the appropriate information 

We should have a power vector between -30dBm and -50dBm to avoid physical attenuators in our test system

My question:

  1. What is the power range we can set for BLE 12dBm downto ??
  2. What is the step size (even if for HCI_VS_DRPb_Set_Power_Vector 5dBm is written in wiki, we could use 1dBm) ?
  3. How can I change the default power vector in BHET? For actual Service pack this option seems to be removed

There were already some posts in this support forum regarding this topic. But I couldn't get the necessary information

Kind regards

Joel

There are already several

  • 0
    TI__Guru* 85400 points
    Hi Joel,

    Most of these questions refer to the Bluetooth Core spec rather than the CC256x spec.

    A1. I think it should be between (-20 dBm to 10 dBm). Please refer to the BT core spec.
    A2. Should be between (2 dB to 8 dB). Please refer to the spec.
    A3. You cannot use the BHET to modify the power vector. You can use the VS_Set_Max_Output_Power() API for this. Please see: e2e.ti.com/.../1635058 on where to call this. Another option would be to use the HCI_Send_Raw_Command() API.

    Regards,
    Gigi Joseph.
  • 0 in reply to Joseph Gigi
    Prodigy 240 points

    Hi Joseph,

    Thanks for your replay.

    In the Core spec I haven’t found the range and step size… Not sure If I checked the right document…

    Anyway. In your datasheet you describe for GFSK and EDR the gain control range and the power control step.  This is not described for LE.

    So I tried to measure it on two devices and I got similar results:

    Module Our Board
    expected measured diff expected measured diff
    dBm dBm dBm dBm dBm dBm
    -46 -46.81 0.81 -46 -50.54 4.54
    -45 -46.5 1.5 -45 -49.85 4.85
    -44 -35.53 -8.47 -44 -36.47 -7.53
    -43 -35.76 -7.24 -43 -36.47 -6.53
    -42 -35.41 -6.59 -42 -36.44 -5.56
    -41 -35.41 -5.59 -41 -36.44 -4.56
    -40 -35.31 -4.69 -40 -36.44 -3.56
    -39 -35.22 -3.78 -39 -36.44 -2.56
    -38 -35.41 -2.59 -38 -36.44 -1.56
    -37 -35.41 -1.59 -37 -36.4 -0.6
    -36 -35.38 -0.62 -36 -36.4 0.4
    -35 -31.91 -3.09 -35 -33.09 -1.91
    -34 -32.02 -1.98 -34 -32.84 -1.16
    -33 -32.02 -0.98 -33 -32.84 -0.16
    -32 -32.02 0.02 -32 -32.84 0.84
    -31 -28.29 -2.71 -31 -29.01 -1.99
    -31 -28.19 -2.81 -31 -28.49 -2.51
    -30 -28.19 -1.81 -30 -28.41 -1.59
    -29 -28.19 -0.81 -29 -28.41 -0.59
    -28 -26.57 -1.43 -28 -26.56 -1.44
    -27 -26.51 -0.49 -27 -26.44 -0.56
    -26 -26.51 0.51 -26 -26.44 0.44
    -25 -24.46 -0.54 -25 -24.38 -0.62
    -24 -23.25 -0.75 -24 -23.24 -0.76
    -23 -23.25 0.25 -23 -23.15 0.15
    -22 -21.68 -0.32 -22 -21.69 -0.31
    -21 -20.82 -0.18 -21 -20.8 -0.2
    -20 -19.64 -0.36 -20 -19.55 -0.45
    -19 -19 0 -19 -18.88 -0.12
    -18 -18.06 0.06 -18 -17.96 -0.04
    -17 -16.58 -0.42 -17 -16.57 -0.43
    -16 -16.08 0.08 -16 -15.94 -0.06
    -16 -15.95 -0.05 -16 -15.87 -0.13
    -15 -14.89 -0.11 -15 -14.82 -0.18
    -14 -13.77 -0.23 -14 -13.82 -0.18
    -13 -12.98 -0.02 -13 -12.96 -0.04
    -12 -11.67 -0.33 -12 -11.65 -0.35
    -11 -10.98 -0.02 -11 -10.93 -0.07
    -10 -10.15 0.15 -10 -10.02 0.02
    -9 -8.95 -0.05 -9 -8.9 -0.1
    -8 -7.96 -0.04 -8 -7.83 -0.17
    -7 -7.02 0.02 -7 -7.02 0.02
    -6 -6.01 0.01 -6 -5.88 -0.12
    -5 -4.99 -0.01 -5 -4.91 -0.09
    -4 -4.03 0.03 -4 -3.92 -0.08
    -3 -3.01 0.01 -3 -2.98 -0.02
    -2 -1.99 -0.01 -2 -1.96 -0.04
    -1 -1 0 -1 -1 0

     

    Conclusion:

    Everything below -23dBm is not usable

    Possible step size 1dB

     

    Can you confirm that?

    Best regards

    Joel