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Original question:

SN75LVPE4410: what is the function of reg_06 Register drv_eq_en_override ?

SN75LVPE4410: Will Receiver Detect State machine setting also influence the output driver's setting?

zhuang rui
Prodigy 40 points
Part Number: SN75LVPE4410

It's a relate question to SN75LVPE4410: what is the function of reg_06 Register drv_eq_en_override ? - Interface forum - Interface - TI E2E support forums

We are using SN75LVPE4410 under a non PCI-e condition. And set the chip RXDET pin with a 59kOhm resistor.

But we find that output amplitude become bigger when setting "drv_eq_en_override" bit on of reg_06 Register.

Will this receiver detect state machine setting also influenced the output amplitude? 

     If not, how could we set the chip using PIN mode to have the same amplitude comparing to I2C mode?

  • 0
    TI__Expert 8899 points

    Hi zhuang,

    Please refer to the data sheet pin 23 and the image below. With pin 23, you can adjust the TX VOD (output amplitude) by setting the pin to L0 through L3.

    Please let me know if you have any more questions.

    Best,

    NP

  • 0 in reply to Nick Peabody
    Prodigy 40 points

    Hi Nick：

    Thanks for your reply. We have tried setting VOD L2 and GAIN L3. But we still got output amplitude smaller than I2C setting "drv_eq_en_override" bit on of reg_06 Register. There is about 3dB difference.

    So I wonder is there any method to improve pin mode's output amp that I missed? 

  • +1 in reply to zhuang rui
    TI__Expert 8899 points

    Hi Zhuang,

    Hope you're doing well. By setting the Gain pin to L3 and the VOD pin to L2 you get the maximum gain from pin settings.

    From what I read in the linked e2e, you are able to increase the output amplitude by setting register 0x06 pins 2:5 to 1. This performance has not been characterized by TI, so it might be device or temperature specific. 

    Best,

    Nick