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TLC59283: TLC59283: What is the aim of Zener?

Part Number: TLC59283

Hello

I will design some front panel with LED, by using the TLC59283.

I looked on the Datasheet and I will apply the schematic given on the first page of the datasheet, with 3 Row of Led to control up to 24 LED; (8x3)

So, the Row selection will be done With signal called "COMSELn", via inverter and CanalP MOS..

This is ok for me, but what is the aim of the resistance and Zener diode added? What should be its values?

I found any note about this on datasheet.

Thank