VL53L4CD Calibration - Measurement Timing Budget

[Brian_Azzopardi]

Hello !

I am calibrating a VL53L4CD ToF sensor. Is it suggested to set a large timing budget (e.g. 200 ms) for the offset and crosstalk calibrations' distance measurement process?

In the distance measurement examples, the timing budget is set to 10 ms for 'fast mode' and 200 ms for 'high accuracy mode'. If the sensor will ultimately be operating in both 'fast' and 'high accuracy' modes, is it better to perform the initial offset and crosstalk calibrations in 'high accuracy mode'?

Thanks! 

Brian

[John E KVAM · Accepted solution]

Brian - 

The crosstalk calibration is trying to work out how many photons bounce off the coverglass and return. I'm thinking a longer timing budget would be better for that. But you don't have to get silly about it. 30ms should be fine. The cal takes quite a few measurements, and going longer will take too much time in production.

the offset cal would also benefit from a longer timing budget, but it also does a number of ranges. So again, 30ms should be just fine. 

Try to balance the accuracy vs the production time. If the cal takes longer than a few seconds you are going to get push-back when you start mass production. 

- john