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TLC5955: Writing MC max current data

Part Number: TLC5955

The TLC5955 user manual in section 8.3.2.5 indicates MC data must have the same data written twice in order to change the data.  What is the function of UVLO in figure 21, the Common Shift Register and Data Latches Configuration.  What is the UVLO signal?  What drives this?

-Bob