8.3.5.8.1.1 OLP Steps

The OLP algorithm list is as follows:

• The pullup current source is enabled. If a load is connected, current passes through the pullup resistor and the OLx_PU comparator output stays low. If an open load condition occurs, the current through the pullup resistor goes 0 and the OLx_PU comparator trips high.
• The pulldown current source is enabled. In the same way, the OLx_PD comparator output either stays low to indicate load-connected, or trips high to indicate an open load condition.
• If both the OLx_PU and OLx_PD comparators report an open load, the OL_PH_x bit in the SPI register latches high, and the nFAULT line goes low, to indicate an OL fault.

When the OL condition is removed, a clear faults command must be issued by the micro-controller either through the CLR_FLT bit or an ENABLE reset pulse which resets open load register bits. The charge pump stays active during this fault condition. The load connections shown in Figure 39 are not supported OLP.

Figure 39. Load Configurations Not Supported