The OPT4060 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. The threshold condition can be programmed to use one of the four channels as a trigger as determined by the THRESHOLD_CH_SEL register. 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. See Interrupt Modes of Operation and Light and Color Measurement for more information on the register and setting up the threshold.