OPT4001 features a threshold detection logic which can be programmed to indicate and update register flags if measured light levels cross thresholds set by the user. There are independent low and high threshold target registers with independent flag registers to indicate the status of measured light level. Measured light level reaching below low threshold and above the high threshold are called faults. Users can program a fault count register, which counts consecutive number of faults before the flag registers are set. This is particularly useful in cases where the controller can read the flag register alone to get indication of measured light level not really needing to do the lux calculations. Details on the register and setting up the threshold is available in Section 8.3.5 and calculations for setting this up is available inThreshold Detection Calculations.