LOD detects a fault caused by an LED open circuit or a short from OUTXn to ground with low resistance by comparing the OUTXn voltage to the LOD detection threshold voltage (0.3 V, typically). If the OUTXn voltage is lower than the threshold voltage when OUTXn is on, that output LOD bit is set to 1 to indicate an open LED. Otherwise, the LOD bit is set to 0. LOD data are only valid for outputs that are programmed to be on. LOD data are latched into the LOD, LSD data latch at the 33rd GSCLK. LOD data for outputs programmed to be off at the 33rd GSCLK are always 0. The LED open detection circuit is shown in Figure 8-5 and Table 8-7 lists an LOD truth table. Refer to Figure 8-6 for an LOD read timing diagram.