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LK_it
LK_it
Associate II
October 11, 2023
Solved

Cover Glass - XTalk Limit (Algorithmn) for various FlightSense Products

  • October 11, 2023
  • 2 replies
  • 1665 views

Hi all,

I'am wondernig about the max XTalk level in kcps which various FlightSense products can compensate. I found only for the new VL53L8CX Sensor a  xtalk compensation limit of 300 kcps - mentioned in application note  AN5939 in section 7 : Guidelines for the cover glass of the VL53L8 Time-of-Flight (ToF) multizone sensor family - Application note (st.com).

What about the max xtalk compensation limits for the products VL53L1X/CB and VL53L5CX  ?

Thanks in advance.

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Best answer by Anne BIGOT

Hello,

 

Yes it does. You have to do the multiplication.

Thanks to your question, we have also updated the AN5856 and AN5831 for which there was an error in the unit.

 

Regards

Anne

2 replies

Anne BIGOT
Anne BIGOT
Technical Moderator
October 11, 2023

Hello,

 

For the VL53L8CX Sensor the xtalk compensation limit is 300 kcps as you found in the AN5939.
You can find the same type of AN for the VL53L5CX. It is AN5856.  The xtalk compensation limit is 100 kcps.

Regarding the L1X, you can find the AN531. It will give you details on cover glass. The VL53L1X is less sensitive to crosstalk. It is around 3Kcps/SPAD

Best regards
Anne

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    Anne BIGOT
    Anne BIGOTBest answer
    Technical Moderator
    October 17, 2023

    Hello,

     

    Yes it does. You have to do the multiplication.

    Thanks to your question, we have also updated the AN5856 and AN5831 for which there was an error in the unit.

     

    Regards

    Anne

    Our community relies on fruitful exchanges and good quality content. You can thank and reward helpful and positive contributions by marking them as 'Accept as Solution'. When marking a solution, make sure it answers your original question or issue that you raised. ST Employees that act as moderators have the right to accept the solution, judging by their expertise. This helps other community members identify useful discussions and refrain from raising the same question. If you notice any false behavior or abuse of the action, do not hesitate to 'Report Inappropriate Content'
      LK_it
      LK_itAuthor
      Associate II
      October 12, 2023

      Hello Anne,

      thanks for the fast reply to my questions. I' am still wondering how to deal with your answer to the xtalk compensation limit for the VL53L1X or VL53L1CB. Does 3kcps/SPAD mean this value  needs to be multiplied with the number of active SPAD to get the max XTalk compensation limit for the VL53L1X and VL53L1CB sensors ? So typical xtalk_l1_limit = 211 SPAD * 3 kcps/SPAD =   633 kcps ?

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