LSD data detect a fault caused by a shorted LED between LED terminals by comparing the OUTXn voltage to the LSD detection threshold voltage level set by LSDVLT in the control data latch. If the OUTXn voltage is higher than the programmed voltage when OUTXn is on, the corresponding output LSD bit is set to 1 to indicate a shorted LED. Otherwise, the LSD bit is set to 0. LSD data are only valid for outputs that are programmed to be on. LSD data are latched into the LOD, LSD data latch at the 33rd GSCLK. LSD data for outputs programmed to be off at the 33rd GSCLK are always 0. The LSD open detection circuit is shown in Figure 8-5 and Table 8-7 lists an LSD truth table. Refer to Figure 8-6 for an LSD read timing diagram.

Figure 8-5 LOD and LSD Circuit

Figure 8-6 LOD and LSD Read and Load Timing Diagram