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LDC1101 Rp mode disable

Max Roh
Expert 4185 points
Other Parts Discussed in Thread: LDC1101, LDC1612

Hi team,

Thanks for detailed explanation of LDC basic with

Inductive sensing: Should I measure L, RP or both?
When devices offer different types of measurement capabilities, it’s important for designers to consider which measurement is best suited for their use case. Some inductive sensing solutions, like TI’s…
By in Technical articles > Analog

By the way, I am curios for LDC1101 with RP+L block.

As you see LDC1101 datasheet, there is 2 measurement block with HRL & RP+L measurement block. 

1. why do I need the L-only measurement operation? is this same with HRL?

2. it looks like there are 2blocks for HRL / RP+L. is this one block?(but it looks 2 block) or 2 separated L measurement block?

3. if it is separated 2block between HRL and RP+L why does TI makes separated IP block?

4. which condition or application need L-only measurement operation? (what is advantage / disadvanatge)? 

Thanks in advance.

  • 0
    TI__Genius 14270 points
    Hello Max.

    The LDC1101 contains both an improved version of the LDC1000 block, but also the LHR (L only block) can be considered as a single channel of the LDC1612 included inside the LDC1101. The LHR mode is recommended for any L measurement.

    For many sensing applications, the L measurement is preferred, as discussed in the blog post you linked to.

    Regards,

    Chris O
  • 0 in reply to Chris Oberhauser66
    TI__Expert 4185 points

    Hi Chris,

    Thanks for reply me, However, questions are different with,

    Questions are,

    1. there is HRL and RP+L mode, what is different for each other? I think HRL is L only and RP+L is RP&L.

    2. when customer use RP+ disabled(L-only measurement operation) mode? what is a benefit than HRL mode?

    Thanks an advance.

  • 0 in reply to Max Roh
    TI__Genius 14270 points
    Hi Max.

    1) The RP+L measurement block provides the RP measurement, along with an L measurement. The LHR provides an better L measurement only.

    2) The L only mode improves both L measurements (the one from the RP+L block and the LHR block), however there will not be a valid RP measurement from the RP+L block.

    Regards,

    ChrisO
  • 0 in reply to Chris Oberhauser66
    TI__Expert 4185 points

    Hi Chris,

    what do you mean on your comment?

    1) The RP+L measurement block provides the RP measurement, along with an L measurement. The LHR provides an better L measurement only.

    2) The L only mode improves both L measurements (the one from the RP+L block and the LHR block), however there will not be a valid RP measurement from the RP+L block.

    I thnk LHR is the best performance it has than L only measurement mode. correct?

    If so, why do I need L measurement only mode? when I don't need RP+, I can use LHR mode ( due to I measure just only L).

    What kind of situation need " L-only measurement"?

    Thanks for explanation several times.

  • 0 in reply to Max Roh
    TI__Genius 14270 points

    Hi Max.

    The LDC1101 makes three measurements:
    1) an RP measurement from the RP+L block
    2) an L measurement from the RP+L block
    3) an L measurement from the LHR block that is higher resolution than the L measurement from the RP+L block.

    If you want to measure RP, use the measurement from the RP+L block.

    If you want to measure L and not measure RP, use the LHR measurement and set the device to L-only.

    Regards,

    ChrisO

  • 0 in reply to Chris Oberhauser66
    TI__Expert 4185 points
    Hi Chris,
    Thanks, I knew already what you say.
    However, why do I need L only mode? we have better performance LHR mode. why do I need to use L-only mode? LHR is better than L-only.
    Right? which application needs L-only mode?

    Thanks.
  • 0 in reply to Max Roh
    TI__Genius 14270 points
    Hi Max.

    Enabling L-only mode improves the L measurement made by the LHR block.

    The RP measurement puts a modulation on the sensor oscillation; this modulation slightly degrades the L measurement. So, if you need to make only an L measurement, you can turn off the modulation and get a small improvement.

    Regards,

    ChrisO