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Custom project requirement for ToF sensor

vishnusf
Associate III

HI,

I am using VL53L1 sensor for a custom project. I had some queries regarding the sensor,

1) what is the integration time for the SPAD sensor?

2) What is the max sampling rate of the SPAD sensor (ADC conversion)? What is the sampling frequency of the SPAD sensor?

3) I see that u mention the sensor having I2C speed of 400khz to 1MHZ, when operating at low speed does that mean the sensor is being sampled at lower rate.

4) I need to getSignal rate from each pixel, is that possible?. what is the maximum number of non overlapping pixel signal rate i can get ?

5) Could u please suggest an alternate sensor with appropriate MCU board that is compatible and easy to program and has many resources.

 

Thak you

1 ACCEPTED SOLUTION

Accepted Solutions
John E KVAM
ST Employee

1) what is the integration time for the SPAD sensor? 

The VL53L1X needs 20ms for it's fastest integration time. The VL53L1CB can do 10ms while ranging continuously. 

2) What is the max sampling rate of the SPAD sensor (ADC conversion)? What is the sampling frequency of the SPAD sensor?

There are 256 individual SPADs in a 16x16 array. Each one can detect a photon, but takes a bit of time - and energy - to reset after the detection. But it's pretty fast. We like to see 20million photon strikes a second. 

3) I see that u mention the sensor having I2C speed of 400khz to 1MHZ, when operating at low speed does that mean the sensor is being sampled at lower rate.

The communication speed has nothing to do with the ranging. They are even seperate cores within the chip. 

4) I need to getSignal rate from each pixel, is that possible?. what is the maximum number of non overlapping pixel signal rate i can get ? 

You can get the number of photon strikes and the number of SPADs used to get those, so you can get the overall signal rate. At rates above 20Million we start shutting down SPADs - we don't need that strong a signal and it uses power. 

5) Could u please suggest an alternate sensor with appropriate MCU board that is compatible and easy to program and has many resources.

We have 9 sensors available. Go to www.st.com/TimeOfFlight

It's our product selector. 


If this or any post solves your issue, please mark them as 'Accept as Solution' It really helps. And if you notice anything wrong do not hesitate to 'Report Inappropriate Content'. Someone will review it.

View solution in original post

2 REPLIES 2
John E KVAM
ST Employee

1) what is the integration time for the SPAD sensor? 

The VL53L1X needs 20ms for it's fastest integration time. The VL53L1CB can do 10ms while ranging continuously. 

2) What is the max sampling rate of the SPAD sensor (ADC conversion)? What is the sampling frequency of the SPAD sensor?

There are 256 individual SPADs in a 16x16 array. Each one can detect a photon, but takes a bit of time - and energy - to reset after the detection. But it's pretty fast. We like to see 20million photon strikes a second. 

3) I see that u mention the sensor having I2C speed of 400khz to 1MHZ, when operating at low speed does that mean the sensor is being sampled at lower rate.

The communication speed has nothing to do with the ranging. They are even seperate cores within the chip. 

4) I need to getSignal rate from each pixel, is that possible?. what is the maximum number of non overlapping pixel signal rate i can get ? 

You can get the number of photon strikes and the number of SPADs used to get those, so you can get the overall signal rate. At rates above 20Million we start shutting down SPADs - we don't need that strong a signal and it uses power. 

5) Could u please suggest an alternate sensor with appropriate MCU board that is compatible and easy to program and has many resources.

We have 9 sensors available. Go to www.st.com/TimeOfFlight

It's our product selector. 


If this or any post solves your issue, please mark them as 'Accept as Solution' It really helps. And if you notice anything wrong do not hesitate to 'Report Inappropriate Content'. Someone will review it.

Hi John,

Thanks for the response I appreciate it. I had a query about the integration time. We are looking for an integration time of 100-200us. Is that possible with any of ur sensors.

Is it possible to have a small meeting to discuss in detail. Please let me know.

Thank you