• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 765 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LDC1101: make conditions for RPMIN setting

Hyuni
Prodigy 180 points
Part Number: LDC1101

Hello, I'm hyeonyeong.

I have known the LDC1101 working method, but I don't know one method well.

this is RP setting on LHR mode. 

I have asked like a question above.

I would like to know RPMIN setting 

First, Rp=pi*Vamp/4/I_DRIVE, knowing parameters on this equation is Rp of sensor and I_DRIVE to be able to determine.

and then we can get the Vamp into safety range

but, that is problems

1. Rp is not correct information because we don't know what Rp any frequency

2. when I_DRIVE should change.

Please check that two problems. thank you

regards 

  • 0
    TI__Mastermind 23810 points
    Hyuni,

    You can measure the Rp of your sensor with and without the target. To do this, set IDRIVE so that Vamp is in a valid range, measure Vamp, and then solve for Rp using the equation.

    Once you know the Rp range you can choose a good IDRIVE setting to satisfy the entire range of operation, and you will not need to change it again for that particular sensor + target combination.
  • 0 in reply to Clancy Soehren
    Prodigy 180 points
    thank you

    I would like to know one more

    If the senspr RP between maximum and minimum don't include in the range, How Do I?
    and My sensor Rp has high value, 414.377kOhm in 1.133MHz on 18.7uA .
    when other I_DRIVE is used, it's out of range of Rp, Hz.

    I don't know proper working well...
  • 0 in reply to Hyuni
    TI__Mastermind 23810 points
    Hyuni,

    I noticed that you asked a few other questions on here as well. Has this question been answered for you? How are you measuring the Rp?