Hi Konan, If I understand your question correctly, you are worried that the ambient values are very less in first case. This is true, you can leave the PD uncovered so that all the phases have the ambient light. Now if you wave your hand on top of PD, you can modulate the ambient light, which confirms that you are indeed sampling ambient light for the given register settings. ADC code of 1450000 roughly translate to ~830mV which is towrds saturation. The behavior that you see in case 2 could of following reasons. 1) If any of the phase is saturated then the others phases ( including the ambient) phase will have the corrupt values. So try observing all the 4 phases and avoid any saturation. 2) Failure to meet the requirements as stated in Table 7 of the datasheet will result in corrupted values. Regards, Prabin
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