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ULC1001: Questions about the operation of ULC1001

Chase Jeong
Mastermind 7645 points
Part Number: ULC1001

Dear TI experts,

My customer considers ULC1001 for their new project.

And they have some questions about the operation of ULC1001.

1. How can ULC1001 detect dust or other foreign body on the lens cover?

(they saw that piezo transducer and lens cover are separate from each other, so how can it detect dust of something others?)

2. They saw that ULC1001 make 2 different frequencies to remove dust on the lens. Does ULC1001 make 2 different frequencies at the same time? or make one frequency and then make other frequency? (not same time?)

3. How can ULC1001 track the frequency of piezo transducer? (using impedance tracking? or something else?)

4. They saw that ULC1001 have flow algorithm for correcting resonant frequency of piezo transducer, depending on the ambient temperature. Could you explain more about the flow chart below?

5. Do you have a plan to make automotive qualified part of ULC1001? Because My customer considers autmotive camera project.

Best regards,

Chase

  • 0
    TI__Mastermind 18380 points

    Hi Chase,

    1. When mass is on the LCS, the overall frequency response is shifted. ULC1001 detects mass on the LCS by detecting that shift in frequency. We typically compare the mass detect frequency to the resonance frequency that was measured in calibration (with nothing adhered to the LCS). Other than resonance frequency, you could use the frequency of the peak real power, peak apparent power, or max current instead. The frequency shift threshold can be altered to make the system more or less sensitive. 

    2. ULC1001 does not drive these frequencies at the same time. They are run in a sequence of bursts. 

    3. ULC1001 uses the IV sense path to take measurements of the LCS during calibration and also measure the temperature and detect mass in operation. During operation, ULC1001 does not track and update the drive frequency. 

    4. The device does not actively track and update the resonant frequency of piezo transducer. Various measurements are taken during calibration, and then used to update the cleaning bursts. The two measurements that use the IV sense path during operation are the mass detect burst and temperature detect burst. These bursts gather data and compare it to the calibration calculations. Essentially the temperature burst will calculate the temperature of the LCS and if it is over the temperature threshold, it start a cool down state and then continue operation once it reaches an operable temperature. Similarly, if the mass detect burst detects a frequency shift over the threshold, it will execute the following cleaning bursts in the sequence (water cleaning, etc.). If mass is not detected, it will stop the sequence. 

    5. Yes. This should RTM soon 

    Hope this is helpful. Please let me know if anything is unclear.

    Regards,
    Sydney Northcutt