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JSnel.1
Visitor II
August 29, 2021
Question

What is the most raw data that can be collected from the TOF sensors like the VL53L1CB or VL53L5CX?

  • August 29, 2021
  • 1 reply
  • 749 views

I'd like to get something as close to the total number of counts for each SPAD vs time since the laser pulse was triggered at the highest temporal resolution possible. It is a bit hard to follow what the histogram functions in the driver are doing. Are these bin sizes adjustable, or are the histograms that you can get from the VL53L1_GetAdditionalData fixed in size?

I saw on another post that for the VL53L5CX there isn't an equivalent set of functions in the driver to get histogram data. Is there any chance that will be something that is coming in the future even with limited functionality?

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1 reply

John E KVAM
ST Employee
September 7, 2021

in a histogram, the bins contain that number of photons gathered during that clock cycle. And the clock cycle is not adjustable.

But during a 30ms range there are maybe a million flashes of light transmitted. And the numbers are the number of photons received for N clocks after the flash starts.

So with a longer timing budget, the numbers will be larger.

The L5 does not return the histogram data. There is way too much of it. (64 zones x 100+ bins is a lot of data.) So it's all processed on the chip.