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TRF7964A: If only the main input is used, is it possible to use RSSI of the auxiliary input is 0?

Shinichi Inoue
Guru 20876 points
Part Number: TRF7964A

Tool/software:

Dear Specialists,

My customer is considering TRF7964A and has a question.

I would be grateful if you could advise.

---

The TRF7964A has two inputs, RX_IN1 (pin 8) and RX_IN2 (pin 9).

Is it correct to understand that data sheet 6.4.1 states,

"Monitor the RSSI of each of the two inputs and select the better one using bit 3 of chip status control register 0x00"?

If only the main input is used, is it possible to use RSSI of the auxiliary input is 0?

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I appreciate your great help in advance.

Best regards,

Shinichi

  • +1
    TI__Guru**** 181206 points
    Shinichi Inoue said:
    If only the main input is used, is it possible to use RSSI of the auxiliary input is 0?

    Hi,

      Do you mean to tie off RX_IN2 to ground? I would strongly suggest you reference the example schematic for RX_IN1 and RX_IN2. Please see below. I suppose that if you tie off RX_IN2 to ground then RSSI register will always show that RX_IN1 has better received signal strength. The receiver system is purposely build with a dual-input architecture to maximize communication robustness. 

  • 0 in reply to Charles Tsai
    Guru 20876 points

    Hi Charles,

    Thank you for your reply.

    I shared your suggestion with the customer.

    The customer has additional questions,

    Could you please advise?

    ---

    I think the following, are these understanding correct?

    1) TRF7964A monitors the RSSI of each of the two inputs, and the better one can be selected by bit 3 of chip status control register 0x00." Is this correct?

    2) If only RF_IN1 is used, then it's fine for the RSSI of RF_IN2 to be 0. 

    ---

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi

  • +1 in reply to Shinichi Inoue
    TI__Guru**** 181206 points
    Shinichi Inoue said:
    1) TRF7964A monitors the RSSI of each of the two inputs, and the better one can be selected by bit 3 of chip status control register 0x00." Is this correct?

    That is correct.

    Shinichi Inoue said:
    2) If only RF_IN1 is used, then it's fine for the RSSI of RF_IN2 to be 0. 

    I think by tieing RF_IN2 to 0, the RSSI Levels and Oscillator Status Register at 0x0F will show as 0. 

  • 0 in reply to Charles Tsai
    Guru 20876 points

    Hi Charles,

    Thank you for your reply.

    I understand.

    I'll share the answer with the customer.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi