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CC2564C: FCC testing

Max Shaffer
Intellectual 680 points

Part Number: CC2564C

We are using the VS_Enable_FCC_Test_Mode function for FCC testing. We have the following questions.

1. What is the correlation between TX power step (0 to 15) and power level (in dBm) for each of the modulation selections?

2. How does this command choose the packet type to transmit (eg 3-DH3, 3-DH5, etc) for each of the modulations selections? Is is data pattern dependent as well?

  • 0
    TI__Expert 5285 points
    Hello,

    Concerning your questions:

    1. you can see the values in the following link: processors.wiki.ti.com/.../CC256x_VS_HCI_Commands

    2. Which command do you use?

    in the modulation scheme of: HCI_VS_DRPb_Tester_Con_TX - you can choose the modulation

    processors.wiki.ti.com/.../CC256x_VS_HCI_Commands

    There you can choose the packet types to be 2EDR or 3EDR

    BR,

    Chen Loewy
  • 0 in reply to Chen Loewy
    Intellectual 680 points

    Hi Chen, thanks for the reply.

    Yes, we found that link to the power table as well, but it appears that the table only applies to GFSK modulation. Do you know what the MAX power levels are for the other modulation schemes?

    We are using the VS_Enable_FCC_Test_Mode command as mentioned above. Do you know which packet types are used for this command?

  • 0 in reply to Max Shaffer
    TI__Mastermind 29361 points

    Max,

    Max Shaffer said:
    Yes, we found that link to the power table as well, but it appears that the table only applies to GFSK modulation. Do you know what the MAX power levels are for the other modulation schemes?

    There is a separate power table for each of the BR/EDR modulations. The link above uses the GFSK power table as an example. By default, the following values are being used by the CC2564CRVM devices.

    Power level 0 Power level 1 Power level 2 Power level 3 Power level 4 Power level 5 Power level 6 Power level 7 Power level 8 Power level 9 Power level 10 Power level 11 Power level 12 Power level 13 Power level 14 Power level 15
    GFSK value in hex 0x9C 0x18 0xDC 0xDC 0xDC 0xDC 0xDC 0xDC 0xDC 0xDC 0xE6 0xF0 0xFA 0x04 0x0E 0x18
    value in dBm -50 12 -18 -18 -18 -18 -18 -18 -18 -18 -13 -8 -3 2 7 12
    2-EDR value in hex 0x9C 0xD4 0xD4 0xD4 0xD4 0xD4 0xD4 0xD4 0xD4 0xD4 0xDD 0xE6 0xEF 0xF8 0x01 0x0B
    value in dBm -50 -22 -22 -22 -22 -22 -22 -22 -22 -22 -17.5 -13 -8.5 -4 0.5 5.5
    3-EDR value in hex 0x9C 0xD4 0xD4 0xD4 0xD4 0xD4 0xD4 0xD4 0xD4 0xD4 0xDD 0xE6 0xEF 0xF8 0x01 0x0B
    value in dBm -50 -22 -22 -22 -22 -22 -22 -22 -22 -22 -17.5 -13 -8.5 -4 0.5 5.5

    Note: only the highest 8 values in each table is used for the dynamic power control feature of the classic BT. Moreover, the Power level 1 in the BR (GFSK) power table is dedicated for BLE output power level.

    You can use the commands mentioned above to update the power tables for each of the BR/EDR modulations to lower the max output power for one or more modulations. 

    Max Shaffer said:
    We are using the VS_Enable_FCC_Test_Mode command as mentioned above. Do you know which packet types are used for this command?

    The VS_Enable_FCC_Test_Mode API is an implementation of the HCI_VS_DRPb_Tester_Con_TX (0xFD84) command. It performs a continuous transmission (100% duty cycle) of the carrier wave (CW mode) or a modulated data stream (e.g. BR, 2-EDR, 3-EDR etc.). So although you can transmit modulated signal in this test mode, it is not packetized data. For that, there is a different Packet TX/RX test mode/command.

    Best regards,

    Vihang

  • 0 in reply to Vihang Parmar
    Intellectual 680 points
    Thanks Vihang, that's helpful. I have two more follow up questions.

    1. Can you provide the power table for Continuous Wave?
    2. Can you tell us which packet types are used by VS_Enable_FCC_Test_Mode when GFSK, EDR2, and EDR3 are specified in the argument list?
  • 0 in reply to Max Shaffer
    TI__Mastermind 29361 points

    Max Shaffer said:
    1. Can you provide the power table for Continuous Wave?

    The GFSK power table values will be used for CW. But, I cannot think of any CW transmit test that would require anything other than the max power (level 15).

    Max Shaffer said:
    2. Can you tell us which packet types are used by VS_Enable_FCC_Test_Mode when GFSK, EDR2, and EDR3 are specified in the argument list?

    Like I explained in my answer, the continuous TX test mode transmits data at 100% duty cycle. There is only a continuous stream of modulated data (w/ modulation scheme specified in the command) and no packets. So, packet type is not relevant in continuous TX test. Only the modulation scheme matters.

    Best regards,

    Vihang

  • 0 in reply to Vihang Parmar
    Intellectual 680 points
    Thanks Vihang, that makes total sense now.