Skip to main content
W
WJLO
Associate II
August 2, 2023
Question

VL53L3 integration time

  • August 2, 2023
  • 2 replies
  • 1693 views
I want to know whether the calculation of integration time using kcps and signal peak count is correct or not

WJLO_0-1690975033577.png

Signal = 3.83 kcps/spad

(3.83*1000*211(SPAD ea ))/2099  =385    =>  1/385 = 2.6 ms

Ambient & signal kcps, is the integration time the same?

 

 

 

This topic has been closed for replies.

2 replies

Anne BIGOT
Anne BIGOT
Technical Moderator
September 4, 2023

Hello 

For the VL53L3, integration time is the same as the measurement period programmed (default is 33ms)
It is not possible to get the integration time from the bins.

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'
John E KVAM
John E KVAM
ST Employee
September 6, 2023

I think you will find that the signal is given in KiloCounts per SPAD per Second. So for a longer integration time, you will get more photon strikes but the signal rate should be the same. 

So Anne is right in that one can assume the integration time is related to the measurement period. Although if you look very closely there is some overhead where we do some house keeping prior to starting the VCSEL (laser) and we do a bit of calculation afterword. During a 33mm Timing Budget, the laser is ranging for about 30ms. 

W
WJLOAuthor
Associate II
September 14, 2023

Hi ,

  I just want to know that the log show 

Signal = 3.83 kcps/spad

The histogram peak count value is 2099 count, then you mention the integration  time is 30ms…

How can I use 2099 count, and 30ms to transfer to 3.83kcps/spad???

Terms & ConditionsAccessibility statement