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CC2592: Output Power

Vitaliy Sakharov
Prodigy 100 points

Part Number: CC2592
Other Parts Discussed in Thread: CC2538,

Hello

I use CC2538 + CC2592 custom board and Smart RF Studio. I select 22 dbm output power and connect power meter to board. Measured output power is 16.25 dbm.

What could be issue?

  • 0
    Guru 735695 points
    Is it conductive test?
  • 0 in reply to YiKai Chen
    Prodigy 100 points

    Yes.

    PA_EN, LNA_EN and HGM are connected to Port A via 10k resistors and controlled by code.
    When PA_EN was tied to VDD output power was 22 dbm.
    I removed 10k resistor and connected PA_EN directly to Port A. Output power was still 22 dbm.
    Output power was 16.25 dbm next power up of the board.

    The two same boards were tested.

  • 0 in reply to Vitaliy Sakharov
    TI__Mastermind 27145 points
    Hi,

    Are you using SmartRF Studio or using your own code?
    Did you calibrate your test cables to find the loss of the cable?

    PA_EN =1
    LNA_EN= 0

    for Transmit condition.

    Did you check the Voltages on the PA_EN and LNA_EN Pins on CC2592 while in Tx?
    Did you use CW-Unmodulated mode in Tx Power test?
    Did you copy our Ref Design? Could you please put a Screen Shot of Schematic or attach a PDF file for Review?


    Were the boards assembled manually or Machine?
    Did you clean (Flux Residue) the Boards?

    If the issue is intermittent then the problem could be Assembly Issue ( Cold Joints).

    Thanks,
    PM
  • 0 in reply to PM
    Prodigy 100 points

    Hello,

    I use SmartRF Studio.

    I didn't. But I used the same cable during test.

    PA_EN is tied to VDD and LNA_EN is tied to GND.

    I used Continuous TX Modulated and Unmodulated modes. Measured values were the same.

    The boards are two-sided. schematic.pdf

    The boards were assembled manually.

    I cleaned. I remounted the chips with better flux.