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TLC6C5816-Q1: MCU pin setting for chip enter standby mode

Part Number: TLC6C5816-Q1

Dears:

I want to use standby mode of TLC6C5816-Q1 

When SRCK, RCK, SER_IN, SER_OUT are setted to input Hi-Z, EN output high Level.  Iq of  TLC6C5816-Q1 is about 600uA, can't enter standby mode.

How should I  set MCU Pin type? Thanks!

Sch as below.