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OPT3101: Ambient light calibration

mahiro.aikawa
Prodigy 80 points
Part Number: OPT3101

I have a question about the current value setting when calibrating Ambient light.

www.ti.com/.../slau791.pdf 2526utm_medium%253Dcpc%2526utm_campaign%253Dasc-null-null-gpn_jp-cpc-pf-google-jp%2526utm_content%253Dopt3101%2526ds_k%253DOPT3101%2526dcm%253Dyes%2526gclid%253DCjw KCAjwjOunBhB4EiwA94JWsLE9ZXGUN1RcXM0UqpgX5Gm1reylqJm61eSLTmvaPaDxYPBoGTTMsxoC7WMQAvD_BwE%2526gclsrc%253Daw.ds

From the URL above
3.6.3.1 Data generation
To get the highest ambient level for a given ambient lamp, it is recommended to run this with the lowest current setting.

Why do I use "lowest current setting" when calibrating?

Is there a difference between the minimum current and the larger current?
Also, tell me the specific current strength.

  • 0
    TI__Genius 9380 points

    The lowest current setting is needed when calibrating because with the ambient light calibration you want to get a high response from the ambient to calibrate it out and using a low current setting will make the device more sensitive to stray light.

    The Illumination driver current can be programmed using a 5-bit DAC, listed in Table 7. Step size of the DAC can also be scaled from 1.4 mA to 5.6 mA using ILLUM_SCALE.

    Let me know if you have any more questions.