OPT3005: About Tolerance

Hi Michael,

The accuracy spec for this device is +-20%, which can be drastically reduced by performing per unit calibration.

Thank you,

Brent Elliott

Hi Michael,

Michael Jeong1 said:

1. Is it correct that the accuracy data means that an error of ±4lux occurs when 20lux is input?

Yes, this is correct.

Michael Jeong1 said:

2. If we do calibrate, how much will accuracy improve?

If calibrated properly, the sensor can achieve an accuracy within only a few percent, as the only limiting factor at this point would be the linearity of the device.

Michael Jeong1 said:

1. What does the typ. % value mean?

The typ % value represents the typical expectation of linearity from the device, ie. across the devices input range you should expect from most devices for the linearity to be within 2% for > 80 lux and 5% for < 80 lux. There is not a min/max spec but we do not expect it to vary significantly for standard light sources.

Thank you,

Brent Elliott

Hi Michael,

Please check out the calibration and testing section of this video series: https://www.ti.com/video/series/precision-labs/ti-precision-labs-ambient-light-sensors.html

Let me know if you have any other questions.

Thank you,

Brent Elliott