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dere1
Associate
February 19, 2024
Solved

VL6180X Sensor, device register memory volatility

  • February 19, 2024
  • 2 replies
  • 1271 views

Hi there,

I was wondering if the memory used to save the values in the device registers for the VL6180X sensor are volatile or non-volatile. This would affect how the sensors behaves during a power cycle. Could someone clarify this for me if possible?

Thanks in advance.

Best answer by John E KVAM

You are correct. There is no volatile memory. At reboot, one loses the I2C address - if it was changed and one loses the calibration information. Restore that and you are good to go.

- john

2 replies

Andrew Neil
Andrew Neil
Super User
February 19, 2024

The documentation would say what (if any) configuration is non-volatile.

If it's not mentioned, then assume it isn't.

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
D
dere1Author
Associate
February 19, 2024

Hi Andrew,

Thanks for the quick reply, 
After a thorough look through the VL6180X datasheet I don't believe it mentions anything about the memory being non-volatile. I'll assume the device registers values are volatile.

John E KVAM
John E KVAMAnswer
ST Employee
February 19, 2024

You are correct. There is no volatile memory. At reboot, one loses the I2C address - if it was changed and one loses the calibration information. Restore that and you are good to go.

- john

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