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TPS274160: Problem with CS pin pull-up

Part Number: TPS274160

Hi Dear,

As shown in the figure,referring to the TPS274160EVM evaluation board, the CS pin is connected to a pull-up resistor. What is the function of the pull-up resistor? However, in the datasheet of TPS274160, the typical application diagram does not show the pull-up resistor, May I ask if the pull-up resistance of the CS pin is necessary?