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SN75LVPE5412: SN75LVPE5412RUAR device ID

minho kang
Prodigy 70 points
Part Number: SN75LVPE5412

Tool/software:

dear person in TI

Hello. 

We are currently evaluating the SN75LVPE5412.

The device ID (0xF1) of the IC is read as 0010 1001. (in datasheet 0010 1000)

Additionally, the EQ profile (0x03) is not being controlled, while the EQ stage (0x02) and Gain (0x03) are functioning properly.

We are wondering if the IC is faulty, as we are experiencing the same issue on three different boards

The laser engraving appears to say SPR412 TI 28ANSK8 G4. I am unable to upload an image. If you provide me with your email address, I will send it to you.

  • 0
    TI__Genius 16810 points

    Hi Minho,

    Just to confirm, is this evaluation being conducted on your own experiment board design? I'm not sure if we have heard of evaluation interest from your account in the past.

    minho kang said:
    The device ID (0xF1) of the IC is read as 0010 1001. (in datasheet 0010 1000)

    I'm running a lab experiment to check what the expected device ID readout should be.

    minho kang said:
    Additionally, the EQ profile (0x03) is not being controlled, while the EQ stage (0x02) and Gain (0x03) are functioning properly.

    Can you clarify what you mean by 0x03 "not being controlled" and how the tests are being conducted? Are the redriver outputs being analyzed with an oscilloscope for example?

    Generally, the channel EQ registers are expected to be operated in the EQ Index system, where certain combinations of settings are ordered into indexes from 0 (minimum EQ boost possible) to 19 (maximum EQ boost possible) as shown in Table 6-2 in the datasheets. Adjusting the registers by themselves can be complicated and sometimes confusing. For example, the eq_profile field inside register 0x03 controls the activity of the "EQ Boost 1 (2nd order)" amplifier that is part of the CTLE system, but if that amplifier is bypassed due to the setting of the EQ Bypass field inside register 0x01, then modifications to eq_profile will not affect the redriver output.

    For more details on redriver EQ amplifiers and the EQ Index system, you can refer to Section 3 of the following application note: Understanding TI PCIe Redriver Equalization

    Best,

    Evan Su

  • 0 in reply to Evan Su
    TI__Genius 16810 points

    Hi Minho,

    In my experiments with the TI DS320PR412-421 evaluation module, I have read back the device ID as 0b'00101001 (hex 0x29), replicating what you have found. I will talk to a few team members to see if the difference in the last bit means anything, but for now I think this is not a problem.

    Best,

    Evan Su

  • 0 in reply to Evan Su
    Prodigy 70 points

    According to the data sheet, the device ID of DS320PR412 is 0x29, and the device ID of SN75LVPE5412 is 0x28. Since your experiment was conducted with the TI DS320PR412-421 evaluation module, it is likely that the device ID was confirmed as 0x29. However, I checked the board made with SN75LVPE5412, and it was read as 0x29, so I inquired.

  • +1 in reply to minho kang
    TI__Genius 16810 points

    Hi Minho,

    minho kang said:
    According to the data sheet, the device ID of DS320PR412 is 0x29

    The DS320PR412 is basically an older name for the SN75LVPE5412. Can I ask what material you are referring to? I am not aware of a datasheet with the "DS320PR412" name that has been published on TI.com and I have not found a mention of a device ID in the DS320PR412-421 EVM user's guide.

    Best,

    Evan Su