VL53L0X offset/xtalk after temperature calibration

[AlexWijnbeek]

Hello, I have a question about the temperature calibration for the VL53L0X Time-of-Flight sensor.

The UM2039 manual states the following:
> [Temperature calibration] has only to be done before offset and cross-talk calibrations, after Reference SPADs  management and before the first ranging is performed.

During assembly of our product, those calibration steps (SPADs, Temperature, Offset, XTalk) are performed in order.

To account for possible temperature changes when the device is in use, we call both  `VL53L0X_PerformRefSPADManagement` and `VL53L0X_PerformRefCalibration` on device boot to ensure the sensor is ready for use for the current temperature.

My question is if this would affect the offset and xtalk calibrations, since the docs state that temperature calibration must be perfomed before those. Or is that sequence merely to ensure the offset and xtalk calibrations are done with the correct temperature calibration.

Thank you for your time.

[Zhiyuan.Han · Accepted solution]

Hi 

The temperature calibration, we call it Ref calibration, Ref calibration is the calibration about two parameters (VHV and phase cal) which are temperature dependent. These two parameters are used to tune the device sensitivity at different temperature conditions, and make sure the device can capture the photons back from target as much as possible. 

Normally it should not affect the offset and xtalk, we put it before offset and cross talk calibration just make sure the device working in the best performance during offset and crosstalk calibration.

Br

Zhiyuan.Han

[AlexWijnbeek]

Thank you for the detailed explanation, this clarifies the situation for us!